Energy Levels of Light Nuclei A = 15

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1 Revised Manuscript 4 August 08 Energy Levels of Light Nuclei A = F. Ajzenberg-Selove University of Pennsylvania, Philadelphia, Pennsylvania Abstract: An evaluation of A = was published in Nuclear Physics A (970), p.. This version of A = differs from the published version in that we have corrected some errors discovered after the article went to press. Figures and introductory tables have been omitted from this manuscript. Reference key numbers have been changed to the NNDC/TUNL format. (References closed December, 969) The original work of Fay Ajzenberg-Selove was supported by the US Department of Energy [DE-AC0-76-ER078]. Later modification by the TUNL Data Evaluation group was supported by the US Department of Energy, Office of High Energy and Nuclear Physics, under: Contract No. DEFG0-88-ER4044 (North Carolina State University); Contract No. DEFG0-9-ER4069 (Duke University).

2 Nucl. Phys. A (970) A = Table of Contents for A = Below is a list of links for items found within the PDF document. Figures from this evaluation have been scanned in and are available on this website or via the link below. A. Nuclides: B, C, N, O, F B. Tables of Recommended Level Energies: Table.: Energy levels of C Table.4: Energy levels of N Table.8: Energy levels of O C. References D. Figures: C, N, O, Isobar diagram E. Erratum to this Publication: PS or PDF

3 B B has been identified in the. GeV proton bombardment of uranium. It is particle stable (966PO09). See also (960ZE0, 96BAC, 966GA). GENERAL: C (Figs. 9 and ) See (960TAC, 96TAE, 964LIB, 964STB, 967LO0). See also (969AR).. C(β ) N Q m = 9.77 The half-life is. ± 0.0 sec (96DO7),.49 ± 0.07 sec (964NE09). The β-spectrum is complex. Transitions have been observed both to the ground state and to the upper of the. MeV levels of N: the latter transition is clearly allowed: see Table. (99AL06, 966AL, 969GA0). The ground state transition of N*(.) has E γ =.990± MeV (967CH9); J π for this state is (see Table.4). Thus J π ( C) = or (99AL06, 964AL: see also (96WA0)). See also (96KIB, 968ZHB) and N.. 9 Be( 6 He, α) Be Q m = 6.4 E b = Be was irradiated with 4 MeV neutrons and the decay of Be was observed [ 9 Be(n, α) 6 He, followed by the above reaction]: the cross section (which is determined for a large 6 He energy spread) is ± 0 mb (967ST).. 9 Be( 7 Li, p) C Q m = 9.09 Observed proton groups are listed in Table. (97MU99, 964CA0). τ m for C*(0.7) is (.77 ± 0.) nsec (968ME08: delayed coincidence technique). Angular distributions of the protons to C*(0, 0.7) are reported at E( 7 Li) =.6,.8, 6.0, 6. MeV by (969SN0) C(d, p) C Q m =.006

4 Table.: Energy levels of C E x (MeV ± kev) J π ; T τ Decay Reactions g.s. ; τ / =. ± 0.08 sec β,, ± 7 ; τ m =.76 ± 0.0 nsec γ, 4 (.48 ± 0).08 ± 40, 4 4. ± 0, 4 (4.60).9 ± 0, ± 0, ± 40 (6.84) (7.06) 7. ± 0, 4 (7.69) (8.00) 8. ± 60 (8.47) Table.: Beta decay of C (99AL06, 966AL, 969GA0) Decay to N* J π Branch (%) log ft a log ft b (MeV) (exp) (theor) g.s ,,, 9.0, a Using τ m =. ± 0.0 sec. b See (99AL97). ±.96 ± ± 4.04 ± (0.8 ± 0.) ± (.0 ± 0.6) 0.06 ± (. ± 0.) 0.99 ±

5 Table.: Proton groups from 9 Be( 7 Li, p) C and 4 C(d, p) C E x (MeV ± kev) E x (MeV) (97MU99) (99MOB) (964CA0) c ± 60 a 0.7 ± ± 0 b.08 ± ± ± ± ± a (97NO4) reports E x = 0.70 ± 0.0 MeV. b Not observed by (964CA0). c ±0 kev (private communication) Identification of C g.s. with N*(.6), T =, Jπ =, is suggested by (96BA6). At E d = 4.9 MeV, proton groups are observed to the ground state of C and to the levels at 0.7,.09, 4.,.94, 6.8 and 7. MeV (±0 kev) (99MOB). The angular distribution of ground state protons implies l n = 0, J π = (99MOB: see also (96PUB) and ref. 9 there, (964AL)); for the first excited state, l n =. θ = 0.09 and 0.0 (99MOB), 0.6 and 0.06 (966GL0) for the ground state and the first excited state, respectively. See also (967NE06). The 0.7 MeV level has a mean life of.7 ± 0. nsec (96LO0); E γ = 70 ± 7 kev. The angular distribution of the γ-rays requires J. Since the l n = stripping requires J π = or, J π = is established (96CH4). The observed lifetime excludes J > (96LO0). See also (964NE09, 96WA0, 966AL, 967CH9).

6 . 4 C(n, γ) C Q m =.8 The capture cross section is < µb (9YAA) O(n, α) C Q m =.009 See (966BAF). The following reactions leading to C have not been reported: C(t, p) C Q m = C(t, d) C Q m =.09 4 C(α, He) C Q m = 9.60 N(n, p) C Q m =

7 N (Figs. 0 and ) GENERAL: Model calculations: (97HAE, 99BRE, 99FEB, 960TAC, 96BAE, 96BUC, 96KUB, 964MAG, 96CO, 96FAB, 96GRH, 96GUA, 96ZAB, 966EL08, 966SO0, 967CO, 967EL0, 967PA0, 968ELA, 968HOH, 968MAB, 968SH08, 968WA04, 968ZH0, 969CHR, 969ELB). General calculations and reviews: (964EVA, 96BEB, 966OLC, 966WIE, 967FAA, 967LO0, 968BIC, 968ZHB, 969HAG, 969IWB). Electromagnetic transitions: (96RON, 966HA, 966PO, 966ROP, 966ROU, 966WAE, 967KUE, 967POJ, 967WAC, 968BIC, 968SH08, 968YAE, 968ZH06, 968ZHB, 969KHC, 969ZHA). Meson interactions: (969KAR). Other: (96BA0, 964VAD). Ground state: µ = nm (96BA6, 964LI4, 967COD). See also (96BR, 964STB, 96ICA, 96MAT, 966MAV, 966WIE, 967SH4, 968PE6, 968ROE, 969CHR, 969FU).. (a) 9 Be( 6 Li, p) 4 B Q m =.0 E b =.9 (b) 9 Be( 6 Li, α) B Q m = 4.47 (c) 9 Be( 6 Li, n) N Q m =.9 (d) 9 Be( 6 Li, 8 Be) 7 Li Q m =.87 (e) 9 Be( 6 Li, He) 0 B Q m =.9 The yield of p 0 and p (reaction (a)) for E( 6 Li) =.84 to 6.40 MeV shows some broad structure: analysis in terms of Ericson fluctuation theory gives a value of 0.4 MeV for the average level width at E x = 8 MeV in N (967SE08). The excitation functions for α 0, α and α (reaction (b)) [E( 6 Li) = to 4 MeV: (96LE0)] and the yield of N (reaction (c)) [E( 6 Li) =. to. MeV: (96NO0)] show a smooth increase in the cross section with energy. For reactions (d) and (e) see (96MC). See also (96BAQ).. 9 Be( 7 Li, n) N Q m =

8 At E( 7 Li) =.9 MeV, γ-rays are observed which are assigned to the ground state decay of N*(9.0, 9.8, 0.80) (964CA8). See also (97NO7). Table.4: Energy levels of N a E x (MeV ± kev) J π ; T τ m (psec) or Γ (kev) Decay Reactions 0.70 ± ± ± ± ± ± 8.6 ± ± 9.0 ± 9.8 ± 0. stable,, 4, 8, 9, 0,,, 4,,,, 4,, 6, 9, 0,, 9, 40, 4, 4, 4, 44, 4, 46, 49, 0,,,, 4,, 6, 7, 8, 9, 60, 6, 6, 6, 64, 6, 66 τ m =.9 ± 0. γ, 4, 8,,,,,, 6, 9, 0,, 9, 4,,,, 8, 9, 6 < 0.0 γ, 4, 8,,,,,, 6, 9, 0,, 9, 46,,,, 8, 9 < γ, 4, 8, 0,,,,, 6, 9, 0,, 9, 49,,,, 7, 8, 9, 6 < 0.08 γ, 4, 8,,,, 6, 9,, 9,,, 6 < 0.0 γ, 4, 8,,,, 6, 9,, 9, 46,,,, ± 0.0 γ, 4, 8,,,,, 9, 9,,, 6 < 0.00 γ, 4, 8,, 6, 9,, 9, 46,,,, 6 γ, 4, 8,,,, 6,, 9,,, 6 γ,, 4, 8,, 6, 9,, 9, 46, γ, 4, 8,,,, 9,, 9,, 9.49 ± 0. ( ) < 0.00 γ, 4, 8,,,, 9,, 9,, 9. ±. or b < 0. γ, 9, 9, 9.76 ±. γ, 9,, ± < 0.9 γ,, 4, 8,,, 9,, 9.99 ± 4 (, ) γ, 9 8

9 Table.4: Energy levels of N a (continued) E x (MeV ± kev) J π ; T τ m (psec) or Γ (kev) Decay Reactions ± γ,, 9,, 0.4 ± 7 γ, p,, 6, 9 () 0.6 ± γ, p, 6, ± () ± (0.94 ± 0).6 ± Γ =. n.94 ±.48 ±.6 ± 4 γ, p,, 6, 7, 9, γ, p,, 4, 8,,, 6, ± 0. γ, n, p 6, 7, 8,, 4.4 ±. γ, n, p, α, 6, 7, 8,, ; ± 6. γ, n, p 6, 7, ± 40 ± n, p, α, 8,,.877 ± ± 4 n, p, α, 8,,,.94 ± 6 ( 9 ) n,,.96 ±.097 ± 4.4 ±.6 ± 4.49 ± 4 () ; ;. ± 0.9 ± ± 0 ( 7 ± n, p, α, 8,, 4 ± γ, n, p, α, 6, 7, 8,,, 8 47 ± 7 γ, n, p, α, 6, 7, 8,,, 9 n, p, 8,, 4 γ, n, p, α, 6, 8,,, 8, 80 p 7, 67 ± 8 n, p, α, 6, 8,,, 8 0 p, α 6 ).4 < n, p, α, 6, n, p, α, 6, 8, ± 8 n, p, α, 6, 8, n, p, α 6, 8, (.) n, p 8.60 (, 7 ) ± 4 n, p, α, 6, 8,,, n, p, α 6, n, p, α,, 8.7 n, α n, p, α 8,, 8.89 n, α 9

10 Table.4: Energy levels of N a (continued) E x (MeV ± kev) J π ; T τ m (psec) or Γ (kev) Decay Reactions 4.0 p, α n, α 4. 0 n, p, α, 8,, 8, () ± n, p, α, 8,, n, α 4. n, α n, p, α,, p, α n, p ± n, p, α,, n, p, α, n, p n, p, α, 8, 8.00 n, p, α, 8. n, p, α, 8, 8,.9 n, α.7 n, t, α,. n, α 8.6 n, α.74 p, t, α.8 < n, p, t, α, 6,.89 ± 0 < n, t, α,.96 ± 0 n, t, α,.99 n, α 6.0 n, p, t, α, 6,, n, p, t, α, 6,, ± 40 n, p, t, α, 6, 6.9 n, p, t, α, 6, 6. ± 0 n, p, t, α, 6,, ± 0 n, p, t, α, 6,, ± 0 n, p, d, t, α, 6,, ± 70 n, p, t, α, 6,, ± 0 00 n, p, d, t, α, 6,,, 6,, 8 0

11 Table.4: Energy levels of N a (continued) E x (MeV ± kev) J π ; T τ m (psec) or Γ (kev) Decay Reactions 6.74 n, p, α, ± 0 n, p, d, t, α, 6,,, ± 0 t, α n, p, d, t, α, 6,,,, n, p, α, 6,, p, t 7.0 broad d, t, α, ± 0 n, p, t, α, 6, 7.9 n, p, α, 6, n, p, α, 6, 8, n, p, d, t, α, 6,, 6, 8, n, p, α, 6, n, p, α, ± n, p, d, t, α, 6, ± 0 00 n, d, α, ± 0 48 ± 9 (p), d, t, α 6, 8, n, α, n, p, α, ± 0 9 ± 4 (n), d, α, ± 0 4 (n), p, d, t, 6, n, α ± 0 0 ± 60 n, p, d, α, 6, 9, ± 0 0 n, d 9. γ, p γ, p 48.7 γ, p γ, p 48 a See also Tables.7 and.0. See (967PH0).. 0 B( 6 Li, p) N Q m = 8.7

12 Table.: Resonances in B α E α (MeV) Γ lab (kev) Particle out E x (MeV) J π Refs. a 0.60 n.4 (94BE08) b.0 n.7 (94BE08).8 n.86 (94BE08).0 n.9 (94BE08). n, p.0 (9SH46).8 n, p. (9SH46) n 0, p n 0, p 0.9 (9SH46, 96BO6, 98HAB, 99LE8) (96BO6, 98HAB, 99LE8, 96MA8, 966MA04) p 0.9 (99LE8, 96MA8).94 < 6 n 0, p 0. (96BO6, 98HAB, 99LE8).99 8 n 0, p 0.8 (96BO6, 98HAB, 99LE8, 966MA04). 9 n 0, p.6 (96BO6, 98HAB, 99LE8, 96MA8, 966MA04). 40 p.4 (99LE8, 96MA8).6 0 n 0, p.6 (, 7 ) (96BO6, 98HAB, 99LE8, 96MA8, 966MA04).64 0 p 0.66 (96MA8).7 40 n 0.7 (96BO6, 98HAB, 96MA8, 966MA04).76 n 0.7 (966MA04).9 n 0.89 (96MA8, 966MA04) 4. p (96MA8) 4.9 n 4.06 (96MA8, 966MA04) 4.4 n (96MA8, 966MA04) 4. n 4. (96BO6, 98HAB, 96MA8, 966MA04) 4. n (96MA8, 966MA04) 4.4 n 0 4. (96MA8, 966MA04) 4.6 p 0 (4.) (96MA8)

13 Table.: Energy levels of N a (continued) E α (MeV) Γ lab (kev) Particle out E x (MeV) J π Refs. a p (96MA8) n (96BO6, 98HAB).4 n (98HAB).49 n 0.0 (98HAB).8 n 0.08 (98HAB).86 n 0.9 (98HAB).98 n 0, n.7 (98HAB) 6.0 n 0, (n ).6 (98HAB) 6.60 n, p.8 (96ED0) c 6.7 n 0, (n ).9 (98HAB) 6.74 n 0, n.9 (98HAB) 6.8 n 0, n.99 (98HAB) 6.89 n, p 6.04 (98HAB, 96ED0) 6.94 n, p 6.08 (96ED0) 7.08 n, p 6.8 (96ED0) 7.6 n, p 6. (96ED0) 7. n, p 6. (96ED0) 7.4 n, p 6.4 (96ED0) 7.6 n, p 6. (96ED0) 7.6 n, p 6.60 (96ED0) 7.77 n, p 6.69 (96ED0) 7.84 n, p 6.74 (96ED0) 7.86 n, p 6.7 (96ED0) 8.07 n, p 6.9 (96ED0) 8.7 n, p 6.98 (96ED0)

14 Table.: Energy levels of N a (continued) E α (MeV) Γ lab (kev) Particle out E x (MeV) J π Refs. a 8.44 n, p 7.8 (96ED0) 8.46 n, p 7.9 (96ED0) 8.9 n, p 7.9 (96ED0) 8.68 n, p 7. (96ED0) 8.88 n, p 7.0 (96ED0) 8.96 n, p 7.6 (96ED0) 8.99 n, p 7.8 (96ED0) 9.49 n, p 7.9 (96ED0) a It should be noted that (94BE08), (98HAB) and (96ED0) are unpublished. They are quoted here only because of the dearth of 4 published information on these resonances. b And private communication. c Resonant energies listed by (96ED0) are ±40 kev.

15 At E( 6 Li) = 4.9 MeV, thirty proton groups are observed corresponding to N states with E x < 6.8 MeV. Angular distributions have been measured for the proton groups corresponding to N*(.7.0, 6., , 7.7, 8., 8.8, ) (966MC0). The ground-state γ-decay of N*(9.8, 0.80) is reported by (964CA8). See also (96MOB) B( 7 Li, d) N Q m =.7 At E( 7 Li) =. MeV, thirty deuteron groups are observed corresponding to N states with E x <. MeV. Angular distributions have been measured for the deuteron groups corresponding to N*(0,.7.0, 6., , 7.7, 8., 8.8, , 9.8) (966MC0). See also (96MOB). The ground state γ-decay of N*(8., 9.0, 9.8, 0.80) is reported by (964CA8).. B(α, n) 4 N Q m = 0.7 E b = 0.99 Reported resonances are displayed in Table. (94BE08, 9SH46, 96BO6, 98HAB, 96ED0, 96MA8, 966MA04). See also (96GOJ, 96GOJ, 96TSA) and (966WEB). See also 4 N. 6. B(α, p) 4 C Q m = E b = 0.99 Reported resonances are listed in Table. (9SH46, 99LE8, 96ED0, 96MA8). Partial widths for several resonances are listed by (99LE8, 96MA8). See also 4 C. 7. B(α, d) C Q m =.68 E b = 0.99 The yield of ground state deuterons has been measured for E α = 7 to MeV by (967AL6). See also C. 8. (a) B( 6 Li, d) N Q m = 9.0 (b) B( 7 Li, t) N Q m = 8. At E( 6 Li) = 4.7 MeV and at E( 7 Li) =.00 MeV, angular distributions are reported for the deuterons and the tritons corresponding to N*(0,.7.0, 6., , 7.7, 8., 8.8, ) (966MC0). See also (96MOB). Gamma rays are observed in reaction (a) which are assigned to the ground state transitions of N*(9., 9.8, 0.80) (964CA8). See also (96HOE) and (964HA09).

16 9. B( 9 Be, He) N Q m = See (96HOE). 0. B( 6 O, C) N Q m =.8 At E( 6 O) = 7, 0,. and MeV, angular distributions corresponding to transitions to N*(0, 6.) have been measured by (96BO4, 966BO): the ground state angular distributions show strong diffraction structure. See also (969GOR, 969BRD, 969KAG).. (a) C(t, n) 4 N Q m = 4.0 E b = 4.80 (b) C(t, p) 4 C Q m = 4.64 (c) C(t, t) C (d) C(t, α) B Q m =.88 Reported resonances are listed in Table.6 (96VA, 96GU0, 96KU09, 96NI04, 96SE0, 969ET0). The triton yield has been measured for E t = 9 to MeV by (96GL04). See also (96NED, 964GRH, 967CH), B and C in (968AJ0), and 4 C and 4 N.. C(α, p) N Q m = 4.96 Angular distributions of the protons corresponding to the ground state transition have been measured at E α =.4 to 6.0 MeV (967IVB), 6. to 9.0 MeV (960PR), 9.7 to. MeV (96YAC), 0.6 to. MeV (96KO04), to 9 MeV (99NO8) and at 4 MeV (96LI07). Angular distributions are also reported for the groups to N*(.7.0, 6., ) (99NO8: 4.6 MeV) and N*(6.) (96LI07: 4 MeV). See also (96EI0, 969GLD), (96KRA, 96HOD, 96TEB, 96DAB, 964DAD, 964KEC, 96NED, 966HIC, 967ROK; theor.) and (99AJ76).. C( 7 Li, α) N Q m =.8 Angular distributions have been measured at E( 7 Li) =. to 4.0 MeV (96HO06; α 0, α, α ) and 0. MeV (969GL07; α 0, α, α and the α s corresponding to N*(7., 7.6, 8.6, 9., 0., 0.9,.8,.,.). (969BAU) report the excitation of N*(.,., 4.9,.6, 6., 6.8, 8.9, 9.8) and (969GL07) also report α groups corresponding to N*(.8, 6.) 6

17 Table.6: Resonances in C t E t (MeV ± kev) E x (MeV) Particles out Refs α 0 (96NI04, 969ET0)..74 p 0, t 0, α (96GU0, 96KU09, 96NI04, 969ET0)..8 t 0 (969ET0).0 ± 0.89 n, α 0 (96VA, 969ET0).9 ± 0.96 n, t 0, α 0 (96VA, 969ET0) p 0 (969ET0) n, α 0, α (96VA, 969ET0).6 ± n, α 0 (96VA, 96SE0, 969ET0) α 0 (969ET0).8 ± 0 6. n, p 0, α 0, α (96VA, 96SE0, 969ET0).98 ± n, p 0 (96VA, 969ET0).0 ± p 0, t 0, α 0 (96SE0, 969ET0).8 ± 6.9 n, p 0, t 0, α 0, α (96VA, 969ET0).8 ± n, p 0, α 0, α (96VA, 96SE0, 969ET0).9 ± n, t 0, α 0, α (96VA, 96SE0, 969ET0).0 ± α 0, α (96SE0, 969ET0) α 0 (969ET0) p 0 (969ET0) t 0, α 0, α (969ET0).89 ± α 0 (96SE0, 969ET0) α (969ET0) and, possibly N*(7., 8.). The mean lifetime of N*(9.8) <.9 0 sec (see Table.7): E γ = 46.6 ± 4.0 kev ( N*(9.8.7)) (969TH0). See also (960SH0) and (969GIB, 969ROG). 4. (a) C( 4 N, C) N Q m = 7.88 (b) C( 9 F, 6 O) N Q m =.0 For reaction (a) see (969BRD); for reaction (b) see (969ROG).. C(d, n) 4 N Q m =. E b =

18 Table.7: Lifetimes of some N states E x (MeV) τ m (psec) Reaction Refs..7 > 6 O(t, α) (96AL9) 9 Be( 4 N, 8 Be) (969NI09).9 ± 0. 4 N(d, p) (967BI).0 < C(p, γ) (968COZV) (4. ±.8) 0 4 N(d, p) (96AL9) (. ± 0.7) 0 4 N(n, γ) (969WE07) 6. < N(d, p) (968GI) < N(n, γ) (969WE07) < C(p, γ) (968COZV) 7.6 < N(d, p) (968GI) 0. ± 0.0 C( He, p) (966LI07) 0.00 ± C(p, γ) (968COZV) 7.0 < N(d, p) (968GI) < N(n, γ) (969WE07) < C(p, γ) (968COZV) ± 0.0 C( He, p) (966LI07) 0.06 ± N(d, p) (968GI) 8. < N(d, p) (968GI) < N(n, γ) (969WE07) < C(p, γ) (968COZV) 9. < C(p, γ) (968COZV) < N(n, γ) (969WE07) 9. < 0. 6 O(γ, p) (969MU07) 9.8 < 0.9 C( 7 Li, α) (969TH0) 8

19 Table.8: Resonances in C d E d (MeV) Emitted particles Γ lab (kev) N* (MeV) Refs. 0.7 p 6.47 (96VA7) 0.64 n, p (90CU, 90RI7, 9KO4, 96MA46, 96VA7) 0.8 n (90RI7).0 α 0 broad 7. (96MA, 966KL06).4 ± 0.04 t (96MA).40 ± 0.04 p 0, t 0, α (96MA, 96MA46). a n 00 (94BEA, 90RI7, 966KL06).64 ± 0.04 t (96MA).78 ± 0.0 n, α (90RI7, 9MA76, 96MA).80 ± 0.0 (p 0 ), t 0, α ± (96MA, 96MA46).0 ± 0.0 (n), α 0, α ± (96MA, 96AL). ± 0.0 (n), p 0, t (96MA, 96MA46, 96AL).4 ± 0.0 n, p 0, α 0 70 ± (9MA76, 96MA, 96MA46).46 ± 0.0 n (9MA76, 96DE9) a Possibly to be identified with.40 MeV resonance (96MA). Observed resonances are displayed in Table.8 (90RI7, 9MA76, 96AL, 96DE9). Excitation functions have recently been measured for E d = 0.8 to. MeV (96JA09; n 0, n, n, n, n ),.0 to. MeV (96AL: 7.0 MeV γ-ray) and. to 4.0 MeV (96DE9; n 0 ). See also (960VA). Polarization measurements are reported for E d =. to 4.0 MeV (967MEN; n 0, n, n ) and.8 MeV (96GAG; n, n 4, n ). See also 4 N. 6. C(d, p) 4 C Q m =.9 E b = 6.60 Observed resonances are displayed in Table.8 (94BEA, 90CU, 9KO4, 96MA46). Excitation functions have recently been measured for E d = to.4 MeV (968LIL; p 0, p ),.0 to 4.0 MeV (96LA09: 4 C*(6.09, 6.7, 7.4)),. to 4. MeV (96DE9; p 0 ), and 4. to 6. MeV (968CO04; p ). See also (96AL). See also 4 C. 7. C(d, d) C E b =

20 Excitation functions for elastically scattered deuterons have been measured for E d = to.4 MeV (968LIL) and 4. to.7 MeV (968CO04). 8. C(d, t) C Q m =. E b = 6.60 Observed resonances are listed in Table.8 (96MA). (968LIL) report measurement of the t 0 excitation function for E d = to.4 MeV. A polarization study has been made at E d =. MeV (969DEH; t 0, t ). See also C. 9. C(d, α) B Q m =.68 E b = 6.60 Observed resonances are listed in Table.8 (96MA). See also (966KL06, 966KLF, 968CO04, 968LIL). 0. C(t, n) N Q m = 9.90 Not reported.. C( He, p) N Q m = Observed proton groups and γ-rays corresponding to N states are listed in Table.9 (99YO, 966GA08, 966WA08, 967PH0). Gamma-ray branching ratios obtained by (96WA6, 966PE04, 966WA08) are displayed in Table.0 which also shows J π values obtained from angular correlation measurements. The two states at E x = 9.6 MeV [see reactions and 9] are separated by. ± 0. kev (968ST0). See also (99BR79). The τ m for N*(7.6, 7.7) are 0. ± 0.0 psec and 0. ± 0.0 psec, respectively: see Table.7 (966LI07). Angular distributions of the ground state protons have been measured for E( He) = 8.7 to 0.9 MeV (96AL0). See also (99AJ76). See also (967YOC, 968WE), (96CLA, 966PRB) and 6 O in (97AJ0).. C(α, d) N Q m = This reaction has been studied at E α = 40. MeV: see Table.9 (969LU07). 0

21 Table.9: Energy levels in N from C( He, p) N and C(α, d) N E x (MeV ± kev) a (99YO) (966GA08) (966WA08) b (967PH0) (969LU07) c.8 ±.66 ± 0 6. ± 6.6 ± ± 7.70 ± ± 7.77 ± 7.8 ± ± 8. ± ± ± ± ± ± ± ± ± 9.69 ± 0 9. ± 6 9. ± ± 9.87 ± ± ± ± ± ± ± ± ± ± ± ± (0.94 ± 0) d a See also (96SH, 966GOJ, 966PHB). b E γ, except for E x = 0.94 MeV; errors for E γ are nominal. c C(α, d) N: E α = 40. MeV. d (969LU07) also reports levels at E x =.90 ± 0.00 (J π = ( 9 )),.8 ± 0.00 and.08 ± 0.00 MeV (J π = ( )).

22 Table.0: Radiative decays in N E i (MeV) J π i E f (MeV) J π f Branch (%) Refs (96WA6, 966PE04, 969SI04) < (96WA6) < (966PE04) < (966PE04) < (96WA6) < (96WA6) < (969SI04) < (968GI) < 4 (966HA0) 00 (96WA6, 966PE04, 968GI) > 97 (969SI04) < 9 (967TH0) < 4 (966AL8) < 4 (968GI) < (966PE04) (967TH0) < 0. (96WA6) 00 (966PE04, 969SI04) 98 ± (96WA6, 968GI) ± (96WA6) <. (968GI) ± (968GI) < (966PE04) < 0. (96WA6) < (96WA6) < 4 (966HA0) < (966PE04) 00 (96WA6, 966PE04, 968GI) < (96WA6) < 4 (966AL8) < 6 (968GI)

23 Table.0: Radiative decays in N (continued) E i (MeV) J π i E f (MeV) J π f Branch (%) Refs < 0.6 (96WA6) 80 ± (96WA6) 77 ± (966WA08) 70 ± 4 (966PE04) 79. ±.9 (967PH0) < (96WA6).0 0 ± (96WA6).7.0 ± (966WA08) c.7 ± (966PE04) 0.9 ±. (967PH0) 7.8 ± (96WA6) ± (966PE04) 4.4 ±.0 (967PH0) < (96WA6) 6 (966PE04). ± 0.6 (967PH0). ± 0.4 (96WA6) 4.4 ± 0.7 (967PH0) 4 ± 4 (96WA6) ± (966WA08) 7 ± 4 (966PE04).4 ±.0 (967PH0) 6 ± 4 (96WA6) 6 ± (966WA08).0 < (96WA6) ± 4 (966PE04) ±.0 (967PH0) ± (96WA6) 7 (966PE04).4 ± 0.6 (967PH0) < (96WA6) < 4 (966WA08).6 ± 0. (967PH0)

24 Table.0: Radiative decays in N (continued) E i (MeV) J π i E f (MeV) J π f Branch (%) Refs a < 0.7 (96WA6) < (966WA08) < (96WA6, 966WA08) 9 ± (96WA6) 9 ± 4 (966WA08) 9.6 ± 0.9 (967PH0).8 ± (96WA6). ± (966WA08) 4.7 ± 0.7 (967PH0) ± (96WA6) 4. ± (966WA08).7 ± 0. (967PH0) < 0 (96WA6). ± 0.4 (96WA6) < (96WA6) < (967PH0) 0 9. a ( ) 0 < 0. (96WA6) 97 (968ST0) 00 (969SI04).7.0 (968ST06) (968ST0) 7 (967TH0) 8 (967TH0).0 0 (967TH0) (968ST0) (969SI04) 8 (968ST0) 9 (969SI04) 0 (967TH0) 44 (968ST0) 8 (969SI04) 4 (967TH0) 7 9 (968ST0) 4

25 Table.0: Radiative decays in N (continued) E i (MeV) J π i E f (MeV) J π f Branch (%) Refs < 0 (96WA6) 4. ±. (967PH0) < (96WA6) ±.7 (967PH0) (96WA6) (96WA6) 4.7 ±. (967PH0) < 0 (96WA6) < (967PH0) < 0 (96WA6).6 ± 0.7 (967PH0) < 0 (96WA6) < (967PH0) 0 < (96WA6) 00 (96WA6) 8. ±.8 (967PH0).7.0 < 0 (96WA6) ±. (967PH0) < (96WA6).7 ± 0.8 (967PH0) < 0 (96WA6). ± 0. (967PH0) < (96WA6) < (967PH0) < 0 (96WA6).0 ± 0.6 (967PH0) < (96WA6) < (967PH0) < (96WA6) < (967PH0) < 0 (96WA6) < 4 (967PH0) 00 (96WA6)

26 Table.0: Radiative decays in N (continued) E i (MeV) J π i E f (MeV) J π f Branch (%) Refs..0 < (96WA6) ±.8 (967PH0) (, ) < (96WA6). ± 0.9 (967PH0) < 0 (96WA6).4 ±. (967PH0) < 0 (96WA6).7 ± 0.9 (967PH0) < 0 (96WA6) 7. ±.0 (967PH0) < (967PH0) 80 ± 0 (96WA6) 77.6 ±.9 (967PH0) ± 0 (96WA6) ±. (967PH0) 0 ± 0 (96WA6) 4.9 ±. (967PH0) < 0 (96WA6) < (967PH0) < (96WA6). ± 0.8 (967PH0) < 0 (96WA6) < (96WA6) 8.8 < (96WA6) 7.7, 8., 8.8 < (967PH0) 0 00 (96WA6) 96.0 ± 0.7 (967PH0) 94 ± 4 (966WA08).7.0 < 0 (96WA6) ± 0.7 (967PH0) 6 ± (966WA08) < (96WA6) < (966WA08) 6

27 Table.0: Radiative decays in N (continued) E i (MeV) J π i E f (MeV) J π f Branch (%) Refs b < 7 (96WA6) < (966WA08) < (96WA6) < (966WA08) < 7 (96WA6) < (966WA08) < (96WA6) < (96WA6) ± (96WA6) < 4 (966WA08, 967PH0) ± 8 (96WA6) ± (966WA08) 6.4 ±.4 (967PH0) ± 8 (96WA6) 8 ± (966WA08) 4.7 ±.6 (967PH0) < 0 (96WA6) < 6 (966WA08) 4 ± 4 (96WA6) < 6 (966WA08) < 0 (96WA6) < 6 (966WA08). ± 0. (967PH0) 9.0 < (967PH0) ± 0. (967PH0) ± 0.7 (967PH0) ±. (967PH0) 9.9 (, ).7 ±. (967PH0) < 4 (967PH0) ± 0. (969SI04) 0 ± (969SI04) 7 ± 0. (969SI04) ±. (969SI04) 7

28 Table.0: Radiative decays in N (continued) E i (MeV) J π i E f (MeV) J π f Branch (%) Refs (9.) (9.) ±. (969SI04).8 ± 0.4 (969SI04) < (969SI04) ± (969SI04) 8 ± (969SI04) 6 ± 0.4 (969SI04) < (969SI04) ± 0. (969SI04) < (969SI04) < (969SI04) < (969SI04) ± (96WA6) ± (966WA08) 47 ± (969SI04) ± 0. (969SI04).0 ± 0.6 (969SI04) ± (96WA6) ( 47 ± (966WA08) < (96WA6) < 0 (966WA08) 7 ± 0. (969SI04) < (96WA6) 9 ± 0. (969SI04) < (96WA6) < 4 (966WA08) 8 ± 0. (969SI04) < 7 (96WA6) ± 0. (969SI04) ± 0. (969SI04) ± 0. (969SI04) ) 4 ± 0. (969SI04) a See also (96WA6, 967PH0). b See also (960HE). c See also (969SI04). 8

29 . C( 6 Li, α) N Q m = Angular distributions have been measured for E( 6 Li) =. to.8 MeV for the α 0 and α groups (964BLB). 4. C( 7 Li, He) N Q m = See (969TH0).. C( B, 9 Be) N Q m = 0.4 See (966POE, 967POE, 967VOA) C(p, γ) N Q m = 0.08 Resonances for capture γ-radiation are listed in Table. (99FEC, 99HED, 968HE, 968SIF, 969SI04). A combination of N*(0.80) and (9.8) permits a good account of the low energy (n, n) and (n, γ) cross sections (99HED). The thermal (n, p) cross section can be ascribed to the E p =. MeV resonance ( N*(.6)) (9BA44: see also 4 N(n, γ) N). See also (99AJ76) and (969TI0). Table.0 displays branching ratios obtained in this and in other reactions. The angular distributions of γ-rays at the E p = 0. MeV resonance ( N*(0.4)) leads to assignments of J =, ( ), and, respectively, for N*(.7, 7.6, 7.0, 0.4) (960HE). The angular distribution of the (0.8 8.) γ-ray fixes J = for N*(8.) (968SIE). A triple correlation study by (968SIE) of the decay of N*(0.80) to the E x = 9. MeV states suggests J = for the upper and J = for the lower of these two states. Lifetimes for various N states have been measured by (968COZV): see Table.7. See also (960FR09, 96FRD, 969ZHA) C(p, p) 4 C E b =

30 Table.: Resonances in 4 C p a 0 E p Γ Γ n Γ p Γ γ J π d E x Refs. (MeV ± kev) (kev) (kev) (kev) (ev) (MeV) 0.6 ± a 0.4 (99HED, 968SIF, 969SI04) 0. ± a (.4 ± 0.4) 0 c 0.6 (99HED, 960HE, 968SIF, 969SI04) 0.7 ± a ± 0. c (99HED, 968SIF, 969SI04) 0.64 ± a 0. ± 0.04 c (99HED, 968SIF, 969SI04).6 ± 7.9 ± (9RO6, 9BA44, 96SA06, 968HA7).94 ± 4 4 ± 4.6. e (968HA7).88 ± ±. 4.6 ± ± ± (9RO6, 9BA44, 96SA06, 968HA7) e.47 ± 8 48 ± (968HA7).09 ± ± ± ± ± 0.4 ; T =.6 (99FEC, 968HE).688 ± (9RO6, 9BA44, 96SA06).788 ± , ( ).876 (9RO6, 9BA44, 96SA06).884 ± (9RO6, 9BA44, 96SA06).0 ± 4 b 4 ± (9RO6, 9BA44, 96SA06, 960BA4, 968HA7).077 ± b 47 ± (9RO6, 9BA44, 96SA06, 960BA4, 968HA7, 968HE) ().7 ± (9RO6, 9BA44, 96SA06, 960BA4, 968HA7).40 ± 4 b ; T =.49 (9RO6, 96SA06, 960BA4).48 ± ; T =. (968HA7, 968HE).908 ± (96SA06, 960BA4, 96HA, 96HA0).9..9 (960BA4, 96HA, 96HA0).8.6 (960BA4, 96HA, 96HA0)

31 Table.: Resonances in 4 C p a (continued) E p Γ Γ n Γ p Γ γ J π d E x Refs. (MeV ± kev) (kev) (kev) (kev) (ev) (MeV) (960BA4, 96HA, 96HA0). (.) (96HA0).6.60 (960BA4, 96HA, 96HA0).7.67 (96HA, 96HA0) (960BA4, 96HA, 96HA0) (960BA4, 96HA, 96HA0) (960BA4, 96HA, 96HA0) (960BA4, 96HA, 96HA0) (960BA4, 96HA) (96HA, 96HA0).4.00 (96HA, 96HA0).6. (96HA, 96HA0) a See also (99HEB) and Table. in (99AJ76). b The Γ α are < 0. kev for E res =.6 to. MeV, except for the resonances at E p =.0,.08 and.4 MeV for which they are, respectively, 0.6,. and. kev (96SA06). c ωγ (in ev) (968SIF, 969SI04). d See also (99AJ76). e These states correspond to the levels listed in the line below: a different boundary condition was used to obtain E res.

32 The elastic scattering has been studied for E p = 0.4 to.7 MeV. At the E p = 7 kev resonance (see Table.), the scattering is consistent with d-wave formation of a J π = state. No anomalies are observed at E p = 0. and 0.6 MeV (99HED). However, anomalies are observed at E p =.6,.9,.47,.0,.07 and.48 MeV: the parameters of these are displayed in Table. (968HA7, 968HE). The.48 MeV anomaly is due to a J π = ; T = state at E x =. MeV (which is the analog to the first excited state of C), and is distinct from the J π = resonance in 4 C(p, n) 4 N observed at E p =.4 MeV (968HE). See also (968IWA, 969IWE) C(p, n) 4 N Q m = 0.66 E b = 0.08 Resonances reported by (9RO6, 9BA44, 96SA06, 99FEC, 960BA4, 96HA, 96HA0, 968HE) are listed in Table.. In addition to these, (96HA) report (in an abstract) a broad resonance corresponding to a T = state of N at E x =.6 MeV. At E p =.79 MeV, the distributions favor, but is not excluded (9BA44: see also (9KA0)); a computation of the cross section favors J = (96SA06). At E p =.88 MeV, the angular distribution is consistent with the J π = assignment from 4 N(n, n) 4 N (9BA44). The E p =.7 MeV state has J = or ; the σ nn clearly indicates ther latter (9BA44, 96SA06). For N*(.6) (E p =. MeV), the proton reduced width indicates a single-particle level, while the neutron reduced width is only 0. This is consistent with the assignment T =, corresponding to the ground state of C (9BA44, 96BA6, 99FEC). See also (967VOB, 969BAN, 969TI0). Polarization measurements are reported at E p = 7., 8.8 and 0.4 MeV by (969WOJ; n 0, n, n ) C(d, n) N Q m = Angular distributions have been determined at E d =.,.8 and.8 MeV (967COR; n 0, n, n, n 46 ),. to.08 MeV (96IM0; n 0 ),.0 and. MeV (96IM0; n, n, n 46 ) and.0 MeV (967LA; n 0, n, n, n 4, n, n 6 and N*(8., 9.06, 9.6, 9.)). The transitions to N*(.0, 9.06) involve l p = 0: these states therefore have J π = (967LA). See also (99AJ76) and (96CH4, 964MOG). Studies of the γ-decay of N states reached in this and in other reactions are summarized in Table.0: see (96WA6). See also (967CH9) C( He, d) N Q m = 4.7

33 At E( He) = 4 MeV, angular distributions of the deuterons corresponding to N*(0,.8,.0, 6.) have been measured and analyzed by DWBA: the relative spectroscopic factors for the first four states of N are, 0.0, 0.4, 0.07 in good agreement with the predictions of (97HAE). Angular distributions of the d 0 group are also reported at E( He) = 9 MeV by (96WE, 966DUB, 968DAN).. 4 C(α, t) N Q m = Not reported.. 4 N(n, γ) N Q m = 0.8 Q 0 = 0.8 ± (968GR4). The thermal cross section is 80 ± 0 mb (97BA8), 7 ± 7. mb (964ST). This large cross section is not understood in terms of the present level structure in N: see (99AJ76). Observed capture γ rays are displayed in Table. (96MOC, 967TH0, 968GR4). The very accurate γ-ray energy determinations of (968GR4) show that two states at E x 9. MeV are involved in this reaction as previously suggested by (966WA08). The lower of the two, at E x = 9.8 MeV, decays predominantly to the ground state. The other state at E x = 9.49 MeV, which is preferentially fed in this reaction, decays primarily by cascades via N*(.7,.0, 6., 7.6) (968GR4). See also reactions and 9, (968GRZY, 968ST0) and Table.0. Recoil Doppler broadening of cascade γ-rays has been measured by (969WE07): the derived τ m are listed in Table.7. See also (968CAJ). Observation of non-isotropic correlations in the C 6. cascade means that J for N*(6.): the results are consistent with J = (964BA0). The importance of measuring the (n, γ) cross section at E n = 0.47 and 0.66 MeV for astrophysical considerations is suggested by (968FOA). See also (960CA0, 96JA09, 969HOX) and (98GR0, 964LIC).. 4 N(n, n) 4 N E b = 0.8 The thermal (bound) scattering cross section is. b (96WIA). The scattering amplitude (bound) is a = 9.9±0. fm (96DO4) [a = 9.4±0.0 fm is recommended by (964ST)]. See also (969BAP). The coherent scattering cross section is 0. ± 0. b (964ST). Recent cross section measurements are listed in Table.. Cross section data are summarized in (964ST), while angular distribution data are displayed in (96GOM). Observed resonances are listed in Table.4 (9JO, 9HI, 9FO7, 99HA, 966FOD, 966FOE, 966MAK, 968BO6, 968JOF): for a discussion of the evidence

34 Table.: Gamma radiation from 4 N(n, γ) N Transition in N E γ (MeV ± kev) E γ (MeV ± kev) I γ b (967TH0) (968GR4) (968GR4) (967TH0) (96MOC) C ± ± 0.6. ±.0 4 C.7.6 ±.6 ± ± 0. C.0.4 ±. ± ± 0.9 C ± ± ± C ±.6777 ± 0..9 ± 0.8 < C 7.0. ±. ± ± 0. 9 C 8.. ±.0 ± ± 0. 6 C ± ± 9. ± 0. C ± ± 0. d ±.69 ± ± ± ±.978 ± ± 0..4 ± ± 6.0 ± ± ± ± ±.8848 ± ± ± 0.8 ± ± ± ± ± ± 8.0 ± ± ± ±. ± ± ± 4 c 0. ± ± ± 4 c 0. ± ± ± ± ± 0..7 ± ±.887 ± ± ±.8 ± 0..0 ± ±.8 ± 0..0 ± ±.9996 ± ± 0. 4 a C = capturing state. b In units of photons/00 captures. c (967TH0). d (968GR4). 4

35 leading to J π assignments, see (99AJ76). See also (960BA4) and (966AGA, 967BEF, 968IWA, 969IWE). A polarization measurement has been made at E n =. MeV by (96OT0). See also (96TA07) N(n, n) N Q m = 0. E b = 0.8 Table.: Recent cross section measurements for 4 N n a E n (MeV) Measurements of Refs σ t (99BI9) σ t (960BA4).0 4. σ t (966MAK, 968JOF) σ ne (968BO6) σ e (968BO6) 4., 6, 7 σ nn γ (968COW) σ nn γ (969DIB) σ t, σ e, σ ne (967BA0). 9. σ e (968BO6) 4 σ e (96BA46) σ ne (969NYA)., 9.8 σ ne (96DEG). σ t, σ ne (968HAV) σ t (960PE) 88 σ t (966ME4) 0 7 σ n,n (96BRA). 8 σ n,n (960FE). 8.8 σ n,n (96BO4).. σ n,n (960MC0) 4. σ n,n (96CEB) 4.4 σ n,n (96RA06) 4.7 σ n,n (967PA7) 4.8 σ n,n (96GR4). 4. σ n,p (99GA4)

36 Table.: Recent cross section measurements for 4 N n a (continued) E n (MeV) Measurements of Refs σ n,p (969DIB) 4.7 σ n,p, σ n,np (966CSB, 967CS0) σ n,p, σ n,d (969NYA) σ n,t (966SC).7 8. σ n,t (99GA4) 4. σ n,α (967MO) σ n,t (969NYA).7 σ n,t (967MO). 8. σ n,α (99GA4) σ n,α (966SC) σ n,α (968COW).7 8. σ n,α (99HA) σ n,α (969DIB) 4.7 σ n,α (966CSB) σ n,α (969NYA) a See also (99AJ76). Recent measurements of cross sections for this reaction are listed in Table. (960FE, 960MC0, 96BRA, 96RA06, 96CEB, 96BO4, 96GR4, 967PA7): see the summaries in (964ST, 966JEB). See also (964HE8, 966CSC, 967CS0) and (99AJ76).. 4 N(n, p) 4 C Q m = 0.66 E b = 0.8 The thermal cross-section is.8 ± 0.0 b (964ST),.8 ± 0.0 b (96HA4). A number of resonances are reported by (90JO7), (99GA4) and (96EN0): see Table.4. The results are summarized in (964ST, 966JEB). See also (960BUC, 968DAF). Recent cross-section measurements are listed in Table. (99GA4, 966CSB, 967CS0, 969DIB). See also (964FOA, 969BAN) and (99AJ76). 6. (a) 4 N(n, d) C Q m =. E b = 0.8 (b) 4 N(n, np) C Q m = 7.0 For reaction (a) see (967LI06) and (99AJ76). For reaction (b) see (966CSB, 967CS0). 6

37 Table.4: Resonances in 4 N n a 7 E res (MeV ± kev) Γ lab (kev) Γ n (kev) Γ p (kev) Γ α (kev) J π N* (MeV) Refs ±. < < (9JO, 9HI) ± < < ± ± (90JO7, 9HI, 96EN0).4 (90JO7, 9JO, 9HI).766 (90JO7, 9JO, 9HI).0 ± ± 6. < < (9HI). ± ± ± () () ().880 (9JO, 9HI, 9FO7).96 (9HI).094 (9JO, 9HI, 9FO7, 99GA4).4 (90JO7, 9JO, 9HI, 9FO7, 99GA4).9 ± 8 0. < ± ( ).494 (90JO7, 9HI, 9FO7, 99GA4, 966FOE). (9HI, 9FO7, 99GA4, 966FOD, 966FOE) (99GA4, 966FOD, 966FOE, 966MAK, 968JOF).47 < r.4 (99GA4). 7 r.9 (99GA4).7 40 r.74 9 r.6 (99GA4).9 (99GA4) r r.7 (99GA4).9 (99GA4, 966FOE, 966MAK, 968JOF). 8 r r.8 (99GA4, 966FOE, 966MAK, 968JOF). 0 r r 4. (99GA4).7 0 r r 4.7 (99GA4, 966MAK, 968JOF) (99GA4) r r 4.6 (99GA4, 966SC) r r 4.7 (99GA4) r 4.9 (99GA4, 966SC) 4.60 r. (99GA4, 966SC).0 r. (99GA4, 966SC, 968BO6) r 6.06 (99GA4, 966SC, 968BO6) ()

38 Table.4: Resonances in 4 N n a (continued) E res (MeV ± kev) Γ lab (kev) Γ n (kev) Γ p (kev) Γ α (kev) J π N* (MeV) Refs..94 r 6.8 (99GA4, 966SC) r 6.8 (99GA4, 966SC) r r 6.67 (99GA4, 99HA, 966SC) r r 6.9 (99GA4, 99HA) 6.94 r 7. (99GA4) 00 r (99HA) 7.6 r 7. (99GA4) r 7.68 (99GA4) r r 7.8 (99GA4, 99HA) r 8. (99HA) r 8.0 (99GA4, 99HA) 8 r = resonant channel. a See also (99AJ76).

39 7. (a) 4 N(n, t) C Q m = 4.0 E b = 0.8 (b) 4 N(n, t) 4 He 4 He 4 He Q m =.89 (c) 4 N(n, α) 7 Li Q m = 8.8 For reaction (a) see (99GA4, 966SC, 967LI06, 967RE0) and (968AJ0). For reaction (b) see (967MO). For reaction (c) see (967MO). See also (960FA0, 964SAE), Table., the summaries in (964ST, 966JEB) and (99AJ76). 8. (a) 4 N(n, α) B Q m = 0.7 E b = 0.8 (b) 4 N(n, nα) 0 B Q m =.6 Recent cross-section measurements for reaction (a) are displayed in Table.: these include measurements of cross sections for several different α-groups (99GA4, 966SC) and γ-rays (99HA, 968COW, 969DIB). For summaries of the experimental evidence, see (964ST, 966JEB). Observed resonances are listed in Table.4 (90JO7, 99GA4, 966SC). See also (960FA0), (960BUC, 96CHC) and (964GAA, 968GAM; theor.). For reaction (b), see (960FA0) N(d, p) N Q m = 8.60 Q 0 = 8.64 ± (964MA7). Proton groups corresponding to levels of N are listed in Table. (90MA6, 94SP0, 96DO4, 96AL9, 966GA08, 966GOJ, 969PH0). The J π assignments are based on PWBA and DWBA analyses: see (99AJ76), (969PH0) and Table.6 for a listing of recent angular distribution studies in the range E d = 0. to 7 MeV. See also (966ROV). The angular distributions of protons corresponding to N*(6.) and the p-γ angular correlation fixes J π = for that state (96GO0). (960HOB) has looked for additional states of N with E x 7 MeV: he finds the upper limits to proton groups corresponding to 7.0 < E x < 7. to be %, and to be % of the intensities of groups to known nearby states for 7. < E x < 7.7 MeV. Recent very accurate γ-ray energy measurements have been reported by (967CH9) [E γ = 99.0 ± 0.4 and ± 0.46 kev] by (966AL8) and by (96WA6): the derived E x values are displayed in Table.. Branching ratios have been determined by (96WA6, 968GI, 968ST0) and are shown in Table.0 together with the multipolarities determined by (96WA6). Lifetime measurements are listed in Table.7 (96AL9, 967BI, 968GI). The two states of N at E x = 9. MeV [see Table.0 for branching ratios] are separated by. ± 0. kev (968ST0, 969YOC): see also reaction. 9

40 Table.: N levels from 4 N(d, p) N 40 E x (MeV ± kev) l n J π (90MA6, 966GOJ) (94SP0) (96DO4, 967CH9) A (966GA08) 0 b.76 ± 6.80 ± 0.79 ± 0.46 a.7 ± 0 c 7.0 ± ± 0.4 a.00 ± c,d 6.8 ± ± 0 e,i 7.64 ± ± 0 7. ±.7 f,i ± ± ± 8 0 f,i 7.7 ± ± ±.0 g,i 7 8. ± ± ± ± 4. 0 e,i 8.7 ± ± ±. 8.8 ± 0 h,i ± ± 9.6 ± ± 6 i,, 9. ± ± 6 or i ( ) 9.76 ± ± ± ± ± ± ± ± 6, 0 i 0.48 ± ± ± ± ± ± 7, 0 i 0.8 ± ± 9 i. j j,,,,,,

41 A: (96AL9, 96WA6, 966AL8). a See also (96AL9, 96WA0). b (9GI0, 97WA0). c (9SH8: see (98WAC)). d Isotropic: no clear stripping pattern. e (9GI0, 9SH8, 96GR7, 98WAC). f (9SH8, 96GR7). g (96GR7): (97WA0) find a possible l = 0 component. h (9SH8, 97WA0). i (969PH0): absolute spectroscopic factors are also given. j (96GR7). k (96GO0). (This footnote is not labeled in the table content.) 4

42 Table.6: 4 N(d, p) N angular distribution studies a E d (MeV) Distribution of proton groups Refs p 0, p, p (97SJ68, 96SJB). p 0, p p 7 (967BE09). p 4 p 7 (969BE08).. p, p, p 4, p, p 6 (969GO4)., 4. p, p (96GO0, 96FI0, 966GA09).. p 0 (96GO, 96FI0, 966GA09).4 p 0, p (969BE08).4. p 0, p p (96KA0) p p, p 7 (96RO) 7, 8, 9 p 8, p 0, p, p 6, p 9, p 0 (969PH0) p 0 (967SC9).8,. p 0 (96MO) 6 p 0 (960MO0) 7 p 0 (96ER0) a See (99AJ76) for earlier references. See also (96JA, 96TE0, 96ST7, 96GOL, 96HEB), (99BOC, 960BEB, 96KOE, 96TAA, 964BAV, 964STJ, 966HOD; theor.), (99AJ76) and 6 O in (97AJ0) N(t, d) N Q m = 4.77 The angular distribution of the deuterons corresponding to the ground state of N has been measured at E t =.0,.8 and.98 MeV. The cross section at E t = MeV is 48 mb: this large value and the energy and angular behavior of the differential cross section suggest that this reaction may proceed by a cluster exchange process (964SC09) N(α, He) N Q m = 9.74 At E α = 6 MeV, the angular distribution of the ground state He particles has been measured by (969GA) and analyzed by DWBA: the ratio of the (α, He) and (α, t) cross sections at this energy is.0 ± 0.. See also (968GAC). 4

43 4. 4 N( 9 Be, 8 Be) N Q m = 9.70 The lifetime of N*(.7) is psec (969NI09): see Table.7 and (967BI). See also (96HOE) N( B, 0 B) N Q m = 0.6 See (967PO). See also (969BRD) N( 4 N, N) N Q m = 0.8 Angular distributions of the transition to the ground state of N have been measured for E( 4 N)(cm) =. to 6 MeV (96TO07, 964JOA, 96BEB, 96HIA). See also (96TO0). Below 6. MeV, the tunneling theory of neutron transfer gives a good account of the data. At higher energies, nuclear absorption of the incident 4 N ions occur (96HIA, 966GA04). See also (968GA0). For reviews of the work on this reaction, see (964FLD, 967DAE, 967VOA, 969BRD). For discussions of relevant theories, see (96BRG, 96BRG, 964BRM, 964GRG, 96BRF, 966BUB, 967BRM, 967BRQ, 967PED, 968MAG, 968NAF, 969KAG) N( 9 F, 8 F) N Q m = 0.40 See (968GA0). 46. C(β ) N Q m = 9.77 The β decay takes place to N*(0,.0, 7.0, 8., 9.0): see Table.. Measurements of γ-ray energies give E γ = 99.0 ± 0.4 kev (967CH9), 8 ± 6 and 9048 ± 4 kev (966AL). See also C. 47. N(γ, n) 4 N Q m = 0.8 See (967ZHA, 968YAE, 969ZHA). 4

44 48. N(γ, p) 4 C Q m = 0.08 The integrated cross section for transitions to 4 C(0) for E γ up to 0. MeV = ± MeV mb, assuming an isotropic angular distribution. Pronounced maxima are observed at E γ = 9., 0.4,.7 and 4. MeV. In addition a pigmy resonance at E γ =. MeV and less pronounced structures at E γ =.6 and 7.0 MeV are also observed (964KO0). See also (96FI04) and (967ZHA, 968YAE, 969UBC, 969ZHA). 49. N(e, e) N Using the harmonic oscillator function, analysis of the scattering of 0 and 400 MeV electrons gives, respectively, r rms =.68±0.0 fm and.6±0.0 fm for N (968DAQ). At E e = 07 MeV, excitation of N*(6.) gives Γ 0 γ (M) =.4 ± 0.7 ev and Γ0 γ (E) = 0.06 ± 0.0 ev: δ(e/m) = 0. ± 0.0 (968BE4). 0. N(n, n) N See 6 N.. 4 N(p, p) N The angular distribution of elastically scattered protons has been measured at E p = 9.8 MeV (969SN04). See also (96NAC).. N( He, He) N At E( He) = 9.8 MeV, a number of inelastically scattered He groups are observed corresponding to states in N: see Table.7. Angular distributions were obtained for a number of these, and were analyzed using a local two-body interaction with an arbitrary spin-isospin exchange mixture (969BA06). See also (968BAE). (969BO) measured the angular distribution of elastically scattered He particles at E( He) = MeV.. N(α, α) N 44

45 Table.7: N levels from N( He, He ) and N(α, α ) N* a (MeV ± kev) L a N* b (MeV) L b ± c c c 9.7 ± ± ± ± 40.4 ± 40.9 ± 40. ± ± 40. ± 40 a ( He, He ): (969BA06). b (α, α ) (966HA9). The E x were determined. c Weakly excited. See also (96BU0, 969BA06). 4

46 The surface thickness a = 0.6 fm, as determined from analysis of the scattering of 44 MeV α-particles from N (968FAA). At E α = 40. MeV, a number of particle groups have been observed, and angular distributions have been measured: see Table.7 (966HA9). See also (96BU0), B(E) /e = 4.9 fm 4 for N*(6.): B(E) /e = 60 fm 6 for both N*(.7, 7.7) (966HA9). See also (969BA06). 4. O(β ) N Q m =.760 See O.. (a) 6 O(γ, p) N Q m =.6 (b) 6 O(e, ep) N Q m =.6 Over the giant resonance region in 6 O, the decay takes place to the odd parity states of N at E x = 0 and 6. MeV as well as to both of the even parity states at E x =.7 and.0 MeV. The branching ratios are functions of the excitation energy in 6 O and of the authors: see (96DE4, 96MA4, 96MO, 966KOG, 966OW0, 967CAC, 967CAP, 968BAL, 969MU07, 969SH0). The results are in fair agreement with the predictions of the single-particle, single-hole theory of photoexcitation of 6 O, although some non-single-particle excitation appears to be necessary in some portions of the 6 O giant resonance: see, e.g. (968BAL). High-energy γ-rays have also reported from the decay of N*(7.0, 8., 9.0, 9.) (968BAL, 969HOT, 969MU07). See also the review in (968SCB), (97JO0, 99BR69, 96SC, 968TU0, 969FR0, 969UL0) and (968ZHB; theor.). The τ m of N*(.7) >> 0. psec; τ m for N*(6., 9.) < 0. psec (969MU07): see also Table.7. For reaction (b), see (96DOA) O(n, d) N Q m = 9.90 Angular distribution of the deuterons corresponding to the ground state of N have been determined at E n = 4.4 MeV (964PA, 96VA0) and at 4 MeV (96GA0). See also (96DIE; theor.) O(p, p) N Q m =.6 At E p = 460 MeV, the summed proton spectrum shows two peaks corresponding to the knowckout of p / and p / protons with binding energies of.4 and 9.0 MeV, respectively [ N*(0, 6.)] (966TY0). See also the discussions in (96CLB, 96RIB), (96FO0, 967FUA), (96BEA, 96BE4; theor.) and (99AJ76). 46

47 8. 6 O(d, He) N Q m = 6.6 Angular distributions of the He groups have been measured at E d = 0 MeV (969PU04: to N*(0,.7,.0)), 8 MeV (968GA: to N(0)), 4.4 MeV (967HI06: to N*(0,.7.0, 6.)), MeV (969KAA, 969KAW: to N(0)), and 8 MeV (969DO04: to N*(0,.7.0, 6.)) and analyzed by DWBA. The He group to N*(.) does not show a stripping pattern (969PU04). See also (968BAJ; theor.) O(t, α) N Q m = Angular distributions have been measured at E t = 0.9 to.7 MeV (967KOG; α 0 ),. to.9 MeV (99JO; α 0 ),. to.0 MeV (966SED; α 0 ), and MeV (96AJ0; α 0, α, α ). A γ-ray with E γ =.7 ± 0.00 MeV has been observed in this reaction: see Table.7 (96AL9). See also (99AJ76) O( 4 N, O) N Q m = 4.8 See (96TOD, 969BRD) O(d, α) N Q m = 9.80 See (94PA9) O(p, α) N Q m =.98 Angular distributions of ground state α-particles are reported at E p = 0.84 to.00 MeV (96CA0) and at 7.9, 0.6 and. MeV (964EC0). Angular correlation measurements lead to J =,, ( ), ( ) for N*(.8, 6., 8., 8.8) (96WA06), J =,,, 7 for N*(.8, 7.6, 7.0, 7.7) (966HA0), J = for N*(6.) (966LO0). The M/E mixing ratio of the 7.0 g.s. transition indicates an unusually large retardation of an E transition in a nonself-conjugate nucleus (966HA0). J = for N*(.7) and the mixing parameter fix J = for N*(0.4) which fed the first excited state of N (99HED) in the 4 C(p, γ) N reaction (96WA06). See also (960CL0, 96LO0, 964AMA, 964MA, 964MA7, 964SC0), (99AJ76) and 9 F in (99AJ76, 97AJ0). 47

48 6. 9 F(γ, α) N Q m = 4.0 See (96HAG). 64. (a) 9 F(p, pα) N Q m = 4.0 (b) 9 F(α, α) N Q m = 4.0 For reaction (a) see (96FO0). For reaction (b) see (96LA0) F(d, 6 Li) N Q m =.9 Angular distributions of the 6 Li ions corresponding to N(0) have been measured at E d = 9.0 to. MeV (967DE4), 4. MeV (964DAB), 4.9 MeV (966DE09) and MeV (96SLC). Attempts have been made to fit the data with DWBA: see references above and (96DRB). See also (964BLC) F( 4 N, 8 F) N Q m = 0.40 See (96WIA). 48

49 O (Figs. and ) GENERAL: Model calculations: (960TAE, 960TAC, 96CO, 96KUB, 964ALL, 964AMD, 964BRH, 964RIA, 96CO, 96GIB, 96GRH, 96GUA, 96HUD, 966BOR, 966EL08, 966RIF, 966SO0, 967BOT, 967EL0, 968DE, 968ELA, 968HOH, 968MAB, 968SH08, 968WOC, 968ZHB, 968ZU0, 969DE6, 969ELB, 969GUM, 969SAJ). General calculations and reviews: (964EVA, 967FAA, 967NED, 968BIC). Electromagnetic transitions: (96RON, 966PO, 966ROP, 966WAE, 967KUE, 967POJ, 967WAC, 968BIC, 968SH08, 968ZHB, 968ZH06, 969KHC, 969ZHA). Other: (966WAK, 967AUB, 969FOD, 969HAG). Ground state: J = (96CO7); µ = nm (96CO7, 964LI4, 967COD). See also (964STB, 96MAT, 966MAV, 967NED, 967SH4, 968PE6, 968ROE, 969FU).. O(β ) N Q m =.760 Reported half-lives are listed in Table.9 (94KL6, 9BA8, 97KI, 97PE, 99KI99, 960JA): the weighted mean is.4 ± 0.6 sec. See also (96CS0, 96VA). Using this value for τ / and Q m, log ft =.64. See also (968BA4) and (96GAD, 966MIF, 967AMH, 968SH08, 969LED, 969SU; theor.).. 7 Li( 4 N, 6 He) O Q m =.687 See (97AL78).. (a) 0 B( 6 Li, n) O Q m =.09 (b) 0 B( 7 Li, n) O Q m = 7.97 See (97NO7). 49

50 Table.8: Energy levels of O a E x (MeV ± kev) J π τ m (psec) or Γ (kev) Decay Reactions 0.8 ±.4 ± ± ± ± ± ± ± ± 6 τ / =.4 ± 0.6 sec β,,, 4, 6, 7, 8, 9, 6, 7, 8, 9, 0,,,, 4,, 6, 7, 8, 9 τ m < 0. psec γ 8, 9, 6, 7,, 4,, 6. ± 0. γ 8, 9, 6, 7, 0,,, 4,, 6 < γ 8, 9, 6, 7,,, 4,, 6 < 0.08 γ 8, 9, 6, 7, ± 0.06 γ 8, 9, 6, 7,, 6 γ 8, 6, 7,, 4, 6 Γ =.7 ± 0. kev γ, p 9, 6, 7,.6 ± 0.7 γ, p 9, 7, γ, p ±.4.7 ± γ, p 8, 9, ±.6 (, ).9 ± 0.4 γ, p 8, 9, 9.48 ± 0. ± 0. γ, p 8, 9, 9.0 ± 40 ( ) 80 ± 4 γ, p ± ± ± 0. γ, p 8, 9,, 4 ± p 8, 0, 9.7 ± 0 (, ) 90 ± 0 γ, p ± 8 6 ± 4 p 0, 0.46 ± 0 47 γ, p 9, 0,, ± 0.99 ± p 0, 84 γ, p 9, 0,.0 ± 7 p 0. ± < 0 p 0.0 ± (, ) 6 γ, p 9, 0,. ± 00 T = 8.6 ± < 0 p γ, p 0.7 ± p 9 0

51 Table.8: Energy levels of O a (continued) E x (MeV ± kev) J π τ m (psec) or Γ (kev) Decay Reactions.6 ± ( ) p 0.7 ± < 0 p 0,.7 ±.846 ± 0.98 ±. ± 80 p 0 0 p 0 0 p 0 60 p 0 ) 60 p 0.47 ± (.8 0 γ, p p p, He, α, 0,. p, d, He, α.4 broad (p, α) 0,.49 ( ) p p, α p γ, p 9 n, p, He, α, 0,, 4.0 ± 40 (, ) 60 ± 0 n, p, He ± p, α 40 ± 0 n, p, He, α, 0,, p, α ± 0 00 ± 0 n, p, He, α, 4.69 ± ± 0 n, p, He, 4.9 ± ± n, p, He,.4 ± 0 6 ± p, He, α.6 ± ± p, He, α.84 ± 0 (, ) 0 n, p, He, α, 6.04 He, α 6.09 n, He, α 6.9 He, α 6.4 ± 0 70 He, α

52 Table.8: Energy levels of O a (continued) E x (MeV ± kev) J π τ m (psec) or Γ (kev) Decay Reactions 6.48 ± 0 60 ± 90 n, p 6.77 ± 0 00 n, He, α 7.0 ± 0 (, ) 600 n, p, He, α 7.99 ± 0 (, ) 00 He, α 8. ± 0 n, p, He 9.0 ± 0 n, He 9.90 ± 0 n, p, He broad γ, p 9 a See also Tables. and.. 4. B( 6 Li, n) O Q m =.7 See (96HOE).. (a) C( He, n) 4 O Q m =.48 E b =.07 (b) C( He, p) 4 N Q m = (c) C( He, d) N Q m =.0 (d) C( He, He) C (e) C( He, α) C Q m =.88 (f) C( He, 8 Be) 7 Be Q m =.78 Excitation functions for these reactions have been measured over a wide range of energies: see Table.0. Observed resonances are displayed in Table.. For discussions of angular distribution measurements which have been measured at many energies over the range displayed in Table.0, see the writeups of 7 Be in (966LA04), C and C in (968AJ0), and N, 4 N, and 4 O. See also (964DEE). Consideration of the relative yields at E( He) =. and. MeV lead to the tentative J π assignments given in Table. for O*(.00,.79) (97BR8). The assignments for O*(4.0, 4.7, 4.46) are derived from analyses of the He elastic scattering, particle and γ 6.44 angular distributions, and the total cross sections of the n 0 and p groups (964KU0). Above E( He) MeV, the excitation functions show broad maxima (see Table.) but it is not