Nuclear Data Sheets for A = 102

Transcript

1 Nuclear Data Sheets 110 (2009) Nuclear Data Sheets for A = 102 D. DE FRENNE University Ghent Vakgroep Subatomaire en Stralingsfysica Proeftuinstraat 86, B 9000 Gent, Belgium Under Subcontract with National Nuclear Data Center Brookhaven National Laboratory Upton, New York (Received April 14, 2008; Revised February 23, 2009) Abstract: The 1998 evaluation on mass A=102 (1998De15) has been revised, taking into account all data available before december Detailed experimental information is presented from the neutron rich nucleus 102 Rb to the neutron deficient 102 Sn nucleus. No information on excited states of 102 Rb is available and very scarce for 102 Sr Especially new (HI,xnγ) data sets for several nuclides have been evaluated and new and more accurate data for γ intensities and multipolarities obtained. For 102 Ru very precise new data of the Budapest (n,γ) collaboration have been included.a new and very elaborated decay scheme for 102 In is obtained. Isomerism in 102 Y and 102 Nb needs further investigation due to conflicting results. General Policies and Organization of Material: See the January issue of the Nuclear Data Sheets or General Comments: The authors would like to thank B. Singh and the McMaster NDP group for the use of all XUNDL files they prepared for A=102. Cutoff Date: December 31, /$ see front matter 2009 Published by Elsevier Inc. doi: /j.nds

2 NUCLEAR DATA SHEETS Index for A = 102 Nuclide Data Type Page Nuclide Data Type Page Skeleton Scheme for A= Rb Adopted Levels Sr Adopted Levels, Gammas Rb β Decay Y Adopted Levels, Gammas Sr β Decay Zr Adopted Levels, Gammas Y β Decay (0.36 s) Y β Decay (0.298 s) Y β n Decay Cm SF Decay Cf SF Decay U(n,F) Ag (HI,xnγ) Cd Adopted Levels, Gammas In ε Decay Sn εp Decay: 7.0 s 1894 (HI,xnγ) In Adopted Levels, Gammas Sn ε Decay Cr( 58 Ni,αpnγ) Fe( 58 Ni,2αnpγ) Sn Adopted Levels, Gammas Te α Decay 1908 (HI,xnγ) U(α,Fγ) Nb Adopted Levels, Gammas Zr β Decay: 2.9 s Cf SF Decay Mo Adopted Levels, Gammas Nb β Decay (4.3 s) Nb β Decay (1.3 s) Cm, 252 Cf SF Decay Mo(t,p) Mo(t,pγ) Mo( 18 O, 16 Oγ) Er( 30 Si,Xγ) U(n,F) U(α,Fγ) Tc Adopted Levels, Gammas Mo β Decay Tc IT Decay Mo( 3 He,p), 104 Ru(d,α) Ru Adopted Levels, Gammas Tc β Decay (4.35 min) Rh ε Decay (207.3 d) Rh ε Decay (3.742 y) Zr( 9 Be,3nγ) Zr( 10 B,p3nγ) Zr( 13 C,α3nγ) Mo( 3 He,n) Mo(α,2nγ) Mo( 7 Li,p4nγ),( 7 Li,d3nγ) Mo( 12 C, 10 Be) Ru(n,γ) E=thermal Ru(n,γ) E=resonance Ru(d,p) Ru(d,d') 1811 Coulomb Excitation Dy( 36 S,F) Rh Adopted Levels, Gammas Rh IT Decay Zn( 36 S,p3nγ) Mo( 7 Li,3nγ) Ru(p,nγ) Rh(p,d) Pd Adopted Levels, Gammas Rh β Decay (207.3 d) Ag ε Decay (12.9 min) Ag ε Decay (7.7 min) Ge( 34 S,α4nγ) Zr( 13 C,3nγ) Zr( 13 C,3nγ), 94 Zr( 12 C,4nγ) Ru(α,nγ), 100 Ru(α,2nγ) Pd(p,p'γ) 1851 Coulomb Excitation Rh(p,2nγ) Ag Adopted Levels, Gammas Ag IT Decay Cd ε Decay

3

4 Ground State and Isomeric Level Properties 0.23 s 0.0 Nuclide Level Jπ T 1/2 Decay Modes 102 Rb ms 3 %β =100; %β n=18 8 S(n) 2786 SY 0.0 S(p) ms Rb 65 S(α) SY 100% Q =14770 SY S(n) S(p) Y 64 Q(β n)= ?% 102 Sr ms 6 %β =100; %β n= Y 0.0+x high J 0.36 s 4 %β =100; %β n= y low J s 9 %β =100; %β n= Zr s 2 %β = Nb 0.0 (4+) 4.3 s 4 %β = x s 2 %β = Mo min 2 %β = Tc s 15 %β = x (4,5) 4.35 min 7 %β =98 2; %IT= Ru stable 102 Rh 0.0 (1,2 ) d 17 %β =22 5; %ε+%β + = S(α) ms Sr 64 S(n) % Q = LOWJ 0.0+y HIGHJ 0.0+x S(p) s S(α) Y 63 S(n) % Q = S(p) S(α) S(n) S(p) s Zr % x S(n) Q = (4+) s Nb 61 S(α) % Q = (+) y 10 %ε+%β + = ; %IT= Pd stable 102 Ag 0.0 5(+) 12.9 min 3 %ε+%β + = min 5 %IT=49 5; %ε+%β + = Cd min 5 %ε+%β + = In 0.0 (6+) 23.3 s 1 %ε+%β + =100; %β + p= Sn s 2 %ε+%β + = Y s 2 %β n=?; Sn 0.0 (5/2+) 7.0 s 2 %εp=1.2 1; Te μs 30 %α=100 S(p) S(n) S(α) S(p) S(n) Skeleton Scheme for A=102 NUCLEAR DATA SHEETS min Mo 60 (4,5) 0.0+x s 100% Tc 59 S(α) Q = % Q = Ru 58

5 (5/2+) s Sn % 1 Q(εp)=5420 SY μs Te % Q α = S(n) SY 1749 S(n) S(p) S(α) (+) (1,2 ) d S(n) S(p) S(α) S(n) S(p) S(α) (+) min Ag % Q + = S(n) SY S(n) S(p) S(α) (6+) s S(p) In % Q + = S(α) min Cd % Q + = S(p) 3605 SY s Sn % Q + = Skeleton Scheme for A=102 (continued) NUCLEAR DATA SHEETS 78% Rh 57 Q = Q + = % Pd 56

6 Rb NUCLEAR DATA SHEETS 2 37 Rb 65 Adopted Levels Q(β )=14770 SY; S(n)=2786 SY 2003Au03. ΔQ(β )=520;ΔN= PfZX: 600 MeV p induced fission of 238 U. 1995Lh03: mass separated source from 1 GeV p on uranium target. Although one could expect isomerism in this Rb nucleus up to new only one half life is mentioned in the literature. 102 Rb Levels E(level) T 1/2 Comments ms 3 %β =100; %β n=18 8. %β n,t 1/2 : From 1987PfZX. 1750

7 Sr NUCLEAR DATA SHEETS 2 38 Sr 64 Adopted Levels, Gammas Q(β )= ; S(n)= ; S(p)= ; Q(α)= SY 2003Au PfZX: 600 MeV p induced fission of 238 U. 1987PfZX,1986Hi02: mass separated source from 235 U(n,F). 102 Sr Levels Cross Reference (XREF) Flags A 102 Rb β Decay E(level) Jπ XREF T 1/2 Comments A 69 ms 6 %β =100; %β n= %β n: Weighted average of 4.8% 23 (1986ReZS) and 6.0% 20 (1987PfZX. T 1/2 : weighted average of 72 ms 10 (1987PfZX), 69 ms 15 (1986ReZS) and 68 ms 8 (1986Hi02). T 1/2 from γ decay of 93γ and 243γ in 102 Sr decay (1986Hi02), β delayed neutron decay (1987PfZX) or growth and decay of β counting rate (1986ReZS) (2+) A 3.0 ns 12 E(level): from 1995Lh03. T 1/2 : by βγ(t) and centroid shift method (1995Lh03). Jπ: from energy systematics of first 2+ state in other even strontium isotopes. γ( 102 Sr) E(level) Eγ Iγ Comments Eγ: from 1995Lh Rb β Decay 1995Lh03 Parent 102 Rb: E=0.0; Jπ=?; T 1/2 =37 ms 3; Q(g.s.)=15100 syst; %β decay=100. Source: from mass separated fragments of fission of uranium carbide with 1 GeV p. Measured: Eγ, βγ(t), T 1/2. Deduced: 102 Sr levels. 102 Sr Levels E(level) Jπ T 1/2 Comments (2+) 3.0 ns 12 T 1/2 : by βγ(t) and centroid shift method. Jπ: from energy systematics of first 2+ state in other even strontium isotopes. γ( 102 Sr) Eγ E(level) Decay Scheme Rb ms Intensity: relative Iγ %β =100 Q =15100 SY (2+) ns Sr

8 Y 63 1 NUCLEAR DATA SHEETS Y 63 1 Adopted Levels, Gammas Q(β )= ; S(n)= ; S(p)= ; Q(α)= Au Y Levels From 2007Ch07: μ= for Jπ=(2) and μ= for Jπ=(3). The spectroscopic electric quadrupole moment Q(s)= for Jπ=(2) and Q(s)= for Jπ=(3). Cross Reference (XREF) Flags A 102 Sr β Decay E(level) Jπ XREF T 1/2 Comments 0.0+x HIGHJ A 0.36 s 4 %β =100; %β n= %β n: weighted average of (1986ReZS) and (1996Me09). Should be considered as a combined value for both isomers. E(level): from systematics in lighter Y isotopes, two 102 Y isomers are expected. Experimental evidence for the existence of two isomers is based on a different I(152γ)/I(326γ) ratio obtained in the studies of 1983Sh13 and 1988HiZQ. Jπ probably high because production method via 235 U(n,F) favors high spin isomer. Th high spin isomer is directly produced in the fission reaction. See also general comment. T 1/2 : from 1983Sh13, γ(t). Contamination of T 1/2 by low spin isomer cannot be excluded. Others: 0.27 s 7 (1981HiZX), 0.5 s 1, β delayed neutron decay (1980KrZY) s 6 (1986ReZS). 0.9 s 3 (1974GrZN) is probably incorrect. 0.0+y LOWJ A s 9 %β =100; %β n= %β n: weighted average of (1986ReZS) and (1996Me09) should be considered as a combined value for both isomers. E(level): the assignment based on mass separated samples of A=102 produced in U(n,F) with 102 Sr as major activity. As a consequence primarily the decay of the low spin isomer of 102 Y is fed in the β decay of 102 Sr and as such indirectly produced. T 1/2 : Weighted average of 0.30 s 6 (1991Hi02) and 0.29 s 2 (1996Me09). Slight contamination of T 1/2 by high spin isomer cannot be excluded. Other: 0.44 s 6 (1986ReZS) y 6 A y 9 A y 6 1+ A y 9 A y 10 A y? 4 A y 22 A y A y A From 102 Sr β decay. As Jπ=0+ for 102 Sr g.s., very likely the lowest level observed in the β decay of 102 Sr is the low spin isomer of 102 Y. The energies of the observed levels are referred to the excitation energy of the low spin 102 Y isomer However in a recent paper of (2007Ch07) 2 states with J=(2) and (3) are mentioned. No high spin state mentioned. So new experiments needed to solve that problem of isomerism. That means that the results given here should be treated with great caution. Based on log ft in 102 Sr β decay which indicates allowed β transition. Jπ=1+ from log ft<4.5. γ( 102 Y) E(level) Eγ Iγ E(level) Eγ Iγ E(level) Eγ Iγ y y y y y y y? y y y y From 102 Sr β decay. 1752

9 Y 63 2 NUCLEAR DATA SHEETS Y Sr β Decay 1986Hi02 Parent 102 Sr: E=0.0; Jπ=0+; T 1/2 =69 ms 6; Q(g.s.)= ; %β decay= Sr %β decay: From absolute intensity I(243γ)=50 15 per Tc g.s. decays and delayed neutron emission probabilities of 4.8% 23 for 102 Sr and 6.0% 12 for 102 Y. Unobserved 3% of 102 Sr decay not taken into account. An absolute intensity for the 475γ of 6.7 per 100 decays of the 102 Tc 1+ isomer was used (1986Hi02). Mass assignment from mass separated A=102 source from 235 U(n,F). Z assignment from yield, systematics, T 1/2 and level scheme. Measured: Eγ, Iγ, γγ, T 1/2. Deduced: 102 Y levels, log ft, Jπ. Structure information in relation with this work can be found in 1986Pe Y Levels log ft due to the incompleteness of the decay scheme due to the large Q value all log ft values should be considered as lower limits. E(level) Jπ T 1/2 E(level) Jπ s ? log ft<4.5 suggests Jπ 1+. β radiations From γ ray transition intensity balance. M1 multipolarity assumed for all low energy γ rays, except the 93γ for which E2 was assumed because otherwise negative level feeding. As a consequence of that assumption the logft values are only approximate values and should be treated as such 3% of 102 Sr decay unobserved. Eβ E(level) Iβ Log ft Comments ( ) av Eβ= ( ) av Eβ= ( ) av Eβ= ( ) 645.4? av Eβ= ( ) av Eβ= ( ) av Eβ= ( ) av Eβ= ( ) av Eβ= ( ) av Eβ= ( ) 0.0 <3 >5.6 av Eβ= Absolute intensity per 100 decays. γ( 102 Y) Eγ E(level) Iγ Mult. α Eγ E(level) Iγ [M1] [M1] [E2] [M1] [M1] [M1] [M1] [M1] [M1] [M1] [M1] ? x For absolute intensity per 100 decays, multiply by x γ ray not placed in level scheme. 1753

10 Y 63 3 NUCLEAR DATA SHEETS Y Sr β Decay 1986Hi02 (continued) Decay Scheme Sr ms Intensities: relative Iγ %β =100 Q = Iβ Log ft <3 > [M1] [M1] Y [M1] [M1] [M1] [M1] [E2] [M1] [M1] [M1] [M1] s 1754

11 Zr 62 1 NUCLEAR DATA SHEETS Zr 62 1 Adopted Levels, Gammas Q(β )= ; S(n)= ; S(p)= ; Q(α)= Au03. Q (g.s.)=4719 kev 15 en Q (isomer)=4626 kev 23 (2007Ri01) 2007Ri01 supersedes 2006Ha23. Other experimental data: Fission yields: 1987GuZX. 102 Zr Levels Band from 2008Li45. Cross Reference (XREF) Flags A 103 Y β n Decay B 102 Y β Decay (0.36 s) C 102 Y β Decay (0.298 s) D 235 U(n,F) E 238 U(α,Fγ) F 248 Cm SF Decay G 252 Cf SF Decay E(level) Jπ XREF T 1/2 Comments 0.0 # 0+ ABCDEFG 2.9 s 2 %β =100. <r 2 > 1/2 = fm 218 (2004An14, evaluation). T 1/2 : from 1976Ah06; half life was measured by following the growth and decay of the niobium daughter in zirconium samples # BCDEFG 1.8 ns 4 Jπ: 151.9γ is (E2) as seen in 235 U(n,F) # BCDEFG T 1/2 : From (2001Ra27). Others: 1.91 NS 25 from 252 Cf, 254 Cf SF decay by recoil distance Doppler shift method. 3.0 NS from γγγ(t) in 252 Cf(SF)(2005Fo17)and 2.76 NS 36 from the technique of time integral perturbed angular correlations using 252Cf SF and 248 Cu SF sources (2004Sm04). β 2 = (2001Ra27). μ= μ: From G= Sm04, 2005Sm08 with the technique of time integral perturbed angular correlations using 252Cf SF and 248 C SF decays (0+) C Jπ: γ decay to 2+ but not to 4+ suggests (0+) for this level. (1+) cannot be # B DEFG e 4 (2+) FG C excluded but 0+ favored from systematics (2+) BC Jπ: based on systematics: from γ decay to 0+ and e 3 (3+) B EFG c 6 (4+) e 5 (4+) FG # 6 8+ EFG 1.39 ps d 5 (6+) G & 4 (5 ) E G (3,4) FG (4 ) EFG ? 8 B c 6 (6+) G a (8+) E & 6 (5 ) B EFG & 6 (7 ) E G (6 ) EFG (8+) G # EFG 0.53 ps c 4 (8+) FG (7 ) EFG a 5 (10+) G & 5 (9 ) E G (8 ) EFG d 5 (10+) G b 6 (7) FG (9 ) EFG c 5 (10+) G a (12+) G b 6 (8) G # E G 0.28 ps & (10 ) E Continued on next page (footnotes at end of table) 1755

12 Zr 62 2 NUCLEAR DATA SHEETS Zr 62 2 Adopted Levels, Gammas (continued) 102 Zr Levels (continued) E(level) Jπ XREF E(level) Jπ XREF E(level) Jπ XREF & (11 ) E G b 6 (9) G d 6 (12+) G b 6 (10) G a (14+) G # 14+ E G b 6 (11) G & (13 ) E G a (16+) E (15 ) E # 16+ E G # 18+ E # 20+ E Assignment is based on assumption of observed band structure in 252 Cf, 248 Cm SF decay and 238 U(α,Fγ), systematics and γ decay pattern. Least squares procedure was used to calculate level energies based on adopted gammas. T 1/2 from short lived isomers from Doppler profile method (1996Sm04), unless specified otherwise. # (A): g.s. (B): ν5/2[532] ν3/2[411]. & (C): ν5/2[532] 5/2[413]. a (D): Band based on (8+). b (E): ΔJ=1 band based on 7. Possible configurations=ν9/2[404] ν5/2[532] or ν9/2[514] ν5/2[413] for 7 ; ν9/2[404] ν5/2[413] or ν9/2[514] ν5/2[532] for 7+. c (F): ν3/2[411] ν5/2[413]. d (G): ν9/2[404] ν3/2[411]. Alternate configuration=ν9/2[514] ν3/2[541]. e (H): Band based on (2+). γ( 102 Zr) E(level) Eγ Iγ Mult. α Comments (E2) B(E2)(W.u.)= A 2 = , A 4 = for γγ cascade consistent with 4 >4 >2 cascade with mult=q for 4 > 4 transition ? Eγ: Only observed in 238 U(α,Fγ) Continued on next page (footnotes at end of table) 1756

13 Zr 62 3 NUCLEAR DATA SHEETS Zr 62 3 Adopted Levels, Gammas (continued) γ( 102 Zr) (continued) E(level) Eγ Iγ E(level) Eγ Iγ E(level) Eγ Iγ Weighted averages of gammas from 252 Cf, 242 Pu SF decay, and 102 Y decays if possible. Otherwise from 252 Cf, 242 Pu SF decay. Only observed in 238 U(α,Fγ). Placement of transition in the level scheme is uncertain. 1757

14 Zr Zr 62-4 NUCLEAR DATA SHEETS -4 (A) g.s. band (B) ν5/2[532] ν3/2[411] (C) ν5/2[532] 5/2[413] (D) Band based on (8+) (E) ΔJ=1 band based on 7 (F) ν3/2[411] ν5/2[413] (15-) (16+) (13-) (11) (14+) (10) (9-) (8-) (7-) (6-) (4-) (11-) (10-) (9-) 569 (7-) (5-) (12+) 669 (10+) 534 (8+) (9) (8) (7) (10+) 660 (8+) (6+) (5-) A A F 969 (4+) A A A A Zr

15 Zr Zr 62-5 NUCLEAR DATA SHEETS -5 (G) ν9/2[404] ν3/2[411] (H) Band based on (2+) (12+) (10+) (6+) (4+) (3+) (2+) Zr

16 Zr 62 6 NUCLEAR DATA SHEETS Zr Y β Decay (0.36 s) 1991Hi02 Parent 102 Y: E=0.0+x; Jπ=?; T 1/2 =0.36 s 4; Q(g.s.)= ; %β decay= Y %β decay: No normalization possible due to incomplete data. Assignment: mass and charge separation of fission fragments from 235 U(n,F); (K x ray)γ coincidences. Measured: Eγ, Iγ, γγ, (K x ray)γ coin, T 1/2 deduced: 102 Zr levels. Others: 1991Hi02 supersedes 1974GrZN. From systematics, the existence of two Y isomers is expected. The production method ( 235 U(n,F)) favors the high spin isomer, so probably mainly the decay of the high spin 102 Y isomer has been observed by 1983Sh13. Existence of two 102 Y isomers has been confirmed by the different I(152γ)/I(326γ) ratios given by 1983Sh13 and 1991Hi02. However in a recent paper of 2007Ch07 a high spin isomer is not mentioned. 1992Ba28 performed β γ coincidences. 102 Zr Levels E(level) Jπ E(level) Jπ (2+) ? ? From a least squares procedure using measured gammas. From Adopted levels. γ( 102 Zr) Eγ E(level) Iγ Comments I(152γ)/I(326γ)= ? ? 33 3 ΔEγ from 1983Sh From 1991Hi02. Decay Scheme 0.0+x Y s Intensities: relative Iγ %β =100 Q (g.s.)= (2+) Zr

17 Zr 62 7 NUCLEAR DATA SHEETS Zr Y β Decay (0.298 s) 1991Hi02 Parent 102 Y: E=0.0+y; Jπ=?; T 1/2 =0.298 s 9; Q(g.s.)= ; %β decay= Y %β decay: No normalization possible due to incomplete data. Assignment: mass separated samples of A=102 from 235 U(n,F). 102 Sr was selected using a high temperature ionization source. The existence of a second 102 Y isomer is based mainly on a different I(152γ)/I(326γ) ratio for each isomer. Measured: Eγ, Iγ, γγ, T 1/2. Deduced: 102 Zr levels. Others: 1991Hi02 supersedes 1988HiZQ, 1989HiZY, 1974GrZN, 1992Ba28. performed β γ coincidences. 102 Zr Levels E(level) Jπ Comments (0+) Jπ: γ decay to 2+ but not to 4+ suggests (0+) for this level. (1+) cannot be excluded (2+) Jπ: based on systematics: from γ decay to 0+ and 2+. From a least squares procedure using measured gammas. From Adopted levels. γ( 102 Zr) Eγ E(level) Iγ Eγ E(level) Iγ From 1991Hi Decay Scheme 0.0+y Y s Intensities: relative Iγ %β =100 Q (g.s.)= (2+) (0+) Zr Y β n Decay 1996Me09 Parent 103 Y: E=0.0; Jπ=?; T 1/2 =0.23 s 2; Q(g.s.)= ; %β n decay=? Production: Fission 235 U with H 2 beam. Measured:β decay half lives and production yields. 102 Zr Levels E(level)

18 Zr 62 8 NUCLEAR DATA SHEETS Zr Cm SF Decay 1995Du10 Parent 248 Cm: E=0.0; Jπ=0+; T 1/2 = y 6; %SF decay=? 248 Cm T 1/2 : From 1989Ho24. Experiment performed at EUROGAM Daresbury. Measured Eγ, Iγ, γγγ,. 102 Zr Levels E(level) Jπ E(level) Jπ E(level) Jπ From adopted levels (2+) (3+) (4+) (3,4) (4 ) (5 ) (6 ) (7 ) (8 ) (9 ) γ( 102 Zr) E(level) Eγ E(level) Eγ Iγ E(level) Eγ Iγ No uncertainties given. No values given. 252 Cf SF Decay Parent 252 Cf: E=0.0; Jπ=0+; T 1/2 =2.645 y 8; %SF decay=? 252 Cf T 1/2 : From 2003Au Li45: Experiment performed at LBNL. Measured Eγ, Iγ, γγ, γγ(θ) using GAMMASPHERE array of 102 HPGe detectors with Compton suppression. 1997Ha64,1995HaZZ: 252 Cf, 242 Pu(SF): measured: SF decay data, Eγ, Iγ. Deduced: 102 Zr levels, Jπ, band structure. 1991Ho16,1990Ho12: 248 Cm SF. Measured: Eγ, Iγ, γγ. Deduced: 102 Zr levels, Jπ. 1995Du10: 248 Cm SF. Measured: Eγ, γγγ using eurogam. Deduced: 102 Zr levels Jπ, neutron pairing strength. 1971Ch44: measured: fragment kinetic energies, Eγ, Iγ; (fission)γ, (fission)x ray, γγ and (K x ray)γ coin. 1971Ch44 gives also intensities per fission and K x ray per fission. The results of 1980ChZM are based on 254 Cf SF decay. Others: 1970Ch11, 1970Wa05, 1971Ho29, 1972Ho08, 1972Wi15, 1974ClZX. 102 Zr Levels Band from 2008Li45. E(level) Jπ T 1/2 Comments 0.0 # # ns 25 T 1/2 : weighted average of 1.71 ns 14 (1980ChZM) and 2.21 ns 17 (1974JaZN), both determined by recoil distance Doppler shift method. Others: 0.86 ns 18, recoil distance Doppler (1970Ch11); 1.7 ns 4, Ice(t) (1970Wa05). The value 3.17 ns 25 from 1974JaYY is assumed to be τ, rather than T 1/2, and is then identical to T 1/2 =2.21 ns 17 of 1974JaZN # # e 24 (2+) e 3 (3+) c 4 (4+) e 4 (4+) # ps d 4 (6+) Continued on next page (footnotes at end of table) 1762

19 Zr 62 9 NUCLEAR DATA SHEETS Zr Cf SF Decay (continued) 102 Zr Levels (continued) E(level) Jπ T 1/2 E(level) Jπ T 1/2 E(level) Jπ & 4 (5 ) (3,4) (4 ) c 4 (6+) a 5 (8+) (5 ) & 4 (7 ) (6 ) d 4 (8+) # ps c 4 (8+) (7 ) a 5 (10+) & 5 (9 ) (8 ) d 5 (10+) b 5 (7) (9 ) c 5 (10+) a 6 (12+) b 6 (8) # ps & 6 (11 ) b 6 (9) d 6 (12+) b 6 (10) a 6 (14+) # b 6 (11) & 7 (13 ) a 7 (16+) # From least squares fit to Eγ's (by evaluator) using uncertainty of 0.3 kev for each γ ray. From γγ, γγ(θ), observed band structure and systematics, values the same as the adopted ones. From Doppler profile method (1996Sm04), unless otherwise specified of 0.3 kev for each γ ray. # (A): g.s. (B): ν5/2[532] ν3/2[411]. & (C): ν5/2[532] 5/2[413]. a (D): Band based on (8+). b (E): ΔJ=1 band based on 7. Possible configurations=ν9/2[404] ν5/2[532] or ν9/2[514] ν5/2[413] for 7 ; ν9/2[404] ν5/2[413] or ν9/2[514] ν5/2[532] for 7+. c (F): ν3/2[411] ν5/2[413]. d (G): ν9/2[404] ν3/2[411]. Alternate configuration=ν9/2[514] ν3/2[541]. e (H): Band based on (2+). γ( 102 Zr) E(level) Eγ Iγ Comments A 2 = , A 4 = for γγ cascade consistent with 3 >2 >0 cascade with mult=q for 3 > 2 transition. Coefficients have been corrected by the authors for perturbed angular correlations A 2 = , A 4 = for γγ cascade consistent with 4 >4 >2 cascade with mult=q for 4 > 4 transition A 2 = , A 4 = for γγ cascade consistent with 5 >6>4 cascade with mult=d for 5 > 6 transition A 2 = , A 4 = for γγ cascade consistent with 4 >3 >2 cascade with mult=q for 3 > 2 transition and mult=d for 4 > 3 transition A 2 = , A 4 = for γγ cascade consistent with 8 >6 >4 cascade with mult=q for both transition Continued on next page (footnotes at end of table) 1763

20 Zr NUCLEAR DATA SHEETS Zr Cf SF Decay (continued) γ( 102 Zr) (continued) E(level) Eγ Iγ Comments A 2 = , A 4 = for γγ cascade consistent with 7 >6 >4 cascade with mult=d for 7 > 6 transition Initial level= in Table 1 of 2008Li45 seems a misprint From 2008Li45 they state that the uncertainty ranges from 5% for strong transitions to 30% for weak transitions. The evaluator assign as follows: 5% for Iγ>5, 15% for Iγ=2 5 and 30% for Iγ<2. Placement of transition in the level scheme is uncertain. 235 U(n,F) 1973Kh05 E(n)=thermal. Measured: fragment kinetic energies, Eγ, Iγ, E(ce), (fission)γ and (fission)ce coin. Deduced: 102 Zr levels, Jπ. 102 Zr Levels E(level) Jπ Comments ? 8+ E(level): Adopted value for 8+ is 1594 kev. From adopted levels. 1764

21 Zr NUCLEAR DATA SHEETS Zr U(n,F) 1973Kh05 (continued) γ( 102 Zr) E(level) Eγ Iγ Mult. Comments ( E2 ) K/L=6. Mult.: from K/L ratio. Eγ: from adopted levels. Measured conversion electrons Not observed by 1973Kh05, from adopted gammas. 1546? Relative intensity per fission. 238 U(α,Fγ) 2004Hu02 E=30MeV. Measured Eγ, Iγ, γγ with Rochester 4π, highly segmented heavy ion detector array CHICO, in coincidence with the GAMMASPHERE detector array. 102 Zr Levels E(level) Jπ Comments (3+) # (5 ) & (4 ) (6 ) Jπ: Adopted value is (8+) with different band interpretation & (5 ) # (7 ) & (6 ) & (7 ) (8 ) Jπ: Adopted value is (10+) with different band interpretation # (9 ) & (8 ) & (9 ) (10 ) Jπ: Adopted value is (12+) with different band interpretation & (10 ) # (11 ) (12 ) Jπ: Adopted value is (14+) with different band interpretation # (13 ) (14 ) Jπ: Adopted value is (16+) with different band interpretation # (15 ) From 2004Hu02, no uncertainties given by the authors. From adopted levels, unless noted otherwise. (A): g.s. band. # (B): Kπ=5, α=1. Possible configuration=ν5/2[532] (C): Kπ=5, α=0. Possible configuration=ν5/2[532] ν5/2[413]. & (D): (4 ) band. Possible configuration=ν5/2[532] ν3/2[411]. 1765

22 Zr NUCLEAR DATA SHEETS Zr U(α,Fγ) 2004Hu02 (continued) γ( 102 Zr) E(level) Eγ E(level) Eγ E(level) Eγ From level energy difference; not quoted by 2004Hu02. No uncertainties given by the authors. 1766

23 Nb 61 1 NUCLEAR DATA SHEETS Nb 61 1 Adopted Levels, Gammas Q(β )= ; S(n)= ; S(p)= ; Q(α)= Au03. Following (2007Ri01), from mass measurements, the energy difference between 102 Nb gs and 102 Nb isomer is 93 kev 23 with the high spin isomer being the ground state. 102 Nb Levels The level scheme of 102 Nb is extremely complicated and it is not even clear what the Jπ of the ground state and the long lived isomer is. Therefore the experimental results are given in 3 subsets of data as no unique level scheme could be obtained. Further experiments are absolutely necessary to solve that problem. All band assignments are from 2001Hw01,1998Hw08 in 252 Cf SF decay. Due to the controversy about the position of the ground state an the isomer, BAND (B) on the Jπ=1+ state mentioned in 252 Cf SF decay has been omitted. Cross Reference (XREF) Flags A 102 Zr β Decay: 2.9 s B 252 Cf SF Decay E(level) Jπ XREF T 1/2 Comments 0.0 (4+) AB 4.3 s 4 %β =100. %β =100. Jπ: 1976Ah06 proposed a high spin for this level because it decays to levels with spin 3+,4+ and 6+ in 102 Mo. From mass measurements of 2007Ri01 it is clear that the high spin level is the ground state and not the low spin state. 2007Ha32 claims the opposite but the data of 2007Ri01 are more convincing. J suggested from absence of IT from 1+ isomeric state. 0.0+x 1+ A 1.3 s 2 %β =100. %β =100; no it decay reported. E(level): x=93 23 following 2007Ri01 from mass measurements. Jπ: from allowed β transition with log ft=4.71 from 0+, 102 Zr g.s. decay x 9 A x 9 (2+) A x 17 A x 11 A x 21 A x 18 A x 15 A x 6 A x 8 1+ A Jπ: from allowed β transition with log ft=4.8 from 0+, 102 Zr g.s. decay x 24 (1) A Jπ: From log ft= x 4 (1) A Jπ: From log ft= y (1+) B 64.5+y (2+) B y (3+) B y (4+) B y (5+) B y # (6+) B y # (7+) B y # (8+) B y # (9+) B y # (10+) B (3 ) B Eγ=z could be γ to (4+) g.s. and not to a level at 120 kev as suggested by 2001Hw z & (4 ) B (5 ) B z a (2 ) B z b (3 ) B z & (6 ) B z a (4 ) B (7 ) B z b (5 ) B z a (6 ) B z & (8 ) B z b (7 ) B (9 ) B z a (8 ) B z & (10 ) B z b (9 ) B z a (10 ) B Footnotes continued on next page 1767

24 Nb 61 2 NUCLEAR DATA SHEETS Nb 61 2 Adopted Levels, Gammas (continued) 102 Nb Levels (continued) The consequence of the fact that the high spin level would be the ground state and not the low spin is that the spin assignments proposed by 2001Hw01,1998Hw08 in (HI,xnγ) become very uncertain as they still consider the low spin isomer as the ground state.all other proposed spins for excited states are based on that assumption. Maybe what they consider as a 120 kev level could be the ground state. Calculated by the evaluator using a least squares procedure based on adopted gammas. From β delayed gammas in 102Nb β decay (1976Ah06). # (A): ΔJ=1 Band based on (B): Kπ=3, α=1. π1/2[431]ν5/2[532] band, Semi decoupled band. & (C): Kπ=3, α=0. π1/2[431]ν5/2[532] band. a (D): Kπ=2, α=0. π1/2[431]ν5/2[532] band, Semi decoupled band. b (E): Kπ=2, α=1. π1/2[431]ν5/2[532] band. γ( 102 Nb) Two sets of γ's 64.5 and kev and 97.4 and 96.4 kev appear in both data sets and are very probably the same. However their exact position in the level scheme is not clear for the moment and more experiments are needed because the level scheme of 102 Nb remains very speculative. E(level) Eγ Iγ Mult. E(level) Eγ Iγ x (E1) x M x x x x x x x x x y y 64.5+y y y y y y y y y y z z z z z z z z z z z z z z z z z z Adopted gammas either from 102 Zr β decay (mostly low spin states) or from 252 Cf SF decay (mostly high spin states). Based on measured conversion coefficients. Placement of transition in the level scheme is uncertain. 1768

25 Nb Nb 61-3 NUCLEAR DATA SHEETS -3 (A) ΔJ=1 band based on (6+) (B) Kπ=3-, α=1 (C) Kπ=3-, α=0 (D) Kπ=2-, α=0 (E) Kπ=2-, α=1 (10-) z 700 (9-) z (10-) z (10+) y 271 (8-) z 570 (9+) y (9-) z (7-) z 307 (8+) y 589 (8-) z (6-) z (7+) y (7-) z 536 B (5-) z (6+) y (4-) z (6-) z 236 (3-) z (2-) z 189 (5-) z 418 B (4-) z 441 C (3-) 0.0+z B Nb

26 Nb 61 4 NUCLEAR DATA SHEETS Nb Zr β Decay: 2.9 s 2007Ri01 Parent 102 Zr: E=0.0; Jπ=0+; T 1/2 =2.9 s 2; Q(g.s.)= ; %β decay= Zr Q(β ): From mass measurements of Nb isotopes by 2007Ri01 and those of Zr isotopes by 2006Ha Ri01:Measured Eγ, Iγ, γγ, βγ coin, xγ coin, Q(β ) values using plastic scintillator for β rays and Ge detectors for γ rays and xrays. Most of the data given here are from 2007Ri01 and data received through e mail reply on January 30, 2007 from S. Rinta Antila.(2008SiZZ) They are more recent and precise than the data of 1989SiZR. 102 Nb Levels E(level) Jπ Comments 0. 0+x 1+ E(level): x=93 23 (2007Ri01) x x 9 (2+) x x x x x x x x 24 (1) x 4 (1) >941+x From least squares fit to measured Eγ's by the evaluator. From Adopted levels, gammas. β radiations Eβ E(level) Iβ Log ft Comments (3685 x 23) >941+x (3686 x 23) x (3921 x 23) x (4027 x 23) x (4195 x 23) x (4368 x 23) x (4380 x 23) x (4465 x # 23) x <0.7 >6.6 Iβ : (4470 x 23) x (4532 x 23) x (4562 x # 23) x >5.7 (4606 x 23) x (4626 x 23) 0.0+x Values are deduced by the evaluator using "LOGFT" code available at value of x is assumed as 0 for this calculation. From βγ counting the ground state feeding upper limit was deduced to be 59% 3. All values should be treated as lower limits since possible feedings to higher levels are unknown. For the calculation of conversion coefficients all low energy transitions for which the multipolarity could not be determined experimentally are considered [M1] because from systematics and structure point of view M1 is a good guess as multipolarity. All values should be treated as upper limits since possible feedings to higher levels are unknown. Absolute intensity per 100 decays. # Existence of this branch is questionable. γ( 102 Nb) The γγ coin information is from e mail reply of Jan 30, 2007 from s. Rinta Antila (2008SiZZ). Iγ normalization: Intensities listed by 2007Ri01 are per 100 decays of 102 Zr. Eγ E(level) Iγ Mult. α I(γ+ce) Comments x (E1) α(k)exp= (2007Ri01) x M α(k)exp= (2007Ri01) x [M1] x [M1] Continued on next page (footnotes at end of table) 1770

27 Nb 61 5 NUCLEAR DATA SHEETS Nb Zr β Decay: 2.9 s 2007Ri01 (continued) γ( 102 Nb) (continued) Eγ E(level) Iγ Mult. α I(γ+ce) Comments x [M1] x [M1] x [M1] x x [M1] x x x x x In γγ coin with x rays, 64γ, 136γ and 157γ. This x x x x x x x x transition is not assigned in the level scheme figure of 2007Ri01. From data received through e mail reply on January 30, 2007 from s. Rinta Antila (2008SiZZ). Based on photon intensities and conversion coefficients deduced by the evaluator using BrIcc code available at For the calculation of conversion coefficients all low energy transitions for which the multipolarity could not be determined experimentally are considered [M1]. For the calculation of absolute intensities 2007Ri01 assumed also M1 for low energy γ's with the exception of the G where EKC pointed to E1. Absolute intensity per 100 decays. x γ ray not placed in level scheme. Decay Scheme Zr s Intensities: I(γ+ce) per 100 parent decays %β =100 Q = Iβ Log ft <0.7 > > >941+x (1) x (1) x x x x x x x x (2+) x x x [M1] [M1] [M1] [M1] M (E1) [M1] [M1] Nb

28 Nb 61 6 NUCLEAR DATA SHEETS Nb Cf SF Decay 2001Hw01,1998Hw08 Parent 252 Cf: E=0; Jπ=0+; T 1/2 =2.645 y 8; %SF decay= Cf %SF decay: %SF= (from 'adopted levels' for 252 Cf in ENSDF database). Measured γ, γγγ using GAMMASPHERE array of 72 Ge detectors. 102 Nb Levels E(level) Jπ Comments 0.0+y # ( 1+ ) E(level): This level is considered by 1998Hw08 as the ground state of 102Nb but is very probably the isomeric state following 2007Ri01. The energy of the isomer would be then kev y # (2+) y # (3+) y # (4+) y # (5+) y (6+) y (7+) y (8+) y (9+) y (10+) ( 3 ) E(level): This level with unknown excitation energy is considered as the lowest energy level to which two ΔJ=1 bands finally decay following 2001Hw x & (4 ) (5 ) x a (2 ) x b (3 ) x & (6 ) x a (4 ) (7 ) x b (5 ) x a (6 ) x & (8 ) x b (7 ) (9 ) x a (8 ) x & (10 ) x b (9 ) x a (10 ) Levels of the different parts of the level scheme calculated with a least squares procedure using the observed gammas. From observed band structure and systematics (2001Hw01). Supersedes the Jπ's of (1998Hw08) for Kπ=3 and Kπ=2 band members which were much higher. But the suggested spins are very doubtful The consequence of the fact that the high spin level would be the ground state and not the low spin is that the spin assignments proposed here become very uncertain as they still consider the low spin isomer as the ground state.(see also Adopted Levels Gammas) All other proposed spins for excited states are based on that assumption. Probably what they consider as a 120 kev level could be the ground state.new experiments to clarify that situation are highly recommended by the evaluator.in the meantime the spins of the levels and the partial level schemes should be considered as very preliminary. (A): ΔJ=1 Band based on (6+). # (B): Kπ=1+, (C): Kπ=(3 ), π1/2[431]ν5/2[532] band, α=1. Semi decoupled band. & (D): Kπ=3, π1/2[431]ν5/2[532] band, α=0. a (E): Kπ=2, π1/2[431]ν5/2[532] band, α=0. Semi decoupled band. b (F): Kπ=2, π1/2[431]ν5/2[532] band, α=1. γ( 102 Nb) E(level) Eγ Iγ Mult. E(level) Eγ Iγ E(level) Eγ Iγ 64.5+y 64.5 (M1) y 97.4 (M1) y y y y y y y y x x x x x x x Continued on next page (footnotes at end of table) 1772

29 Nb 61 7 NUCLEAR DATA SHEETS Nb Cf SF Decay 2001Hw01,1998Hw08 (continued) γ( 102 Nb) (continued) E(level) Eγ Iγ x x x x E(level) Eγ Iγ x x x x x E(level) Eγ Iγ x x x From 1998Hw08. From 1998Hw08. Placement of transition in the level scheme is uncertain. 1773

30 Mo 60 1 NUCLEAR DATA SHEETS Mo 60 1 Adopted Levels, Gammas Q(β )= ; S(n)= ; S(p)= ; Q(α)= Au03. Q = (2006Ha32) with Penning trap setup at IGISOL. 102 Mo Levels Cross Reference (XREF) Flags A 102 Nb β Decay (1.3 s) B 102 Nb β Decay (4.3 s) C 248 Cm, 252 Cf SF Decay D 100 Mo(t,pγ) E 100 Mo( 18 O, 16 Oγ) F 235 U(n,F) G 238 U(α,Fγ) H 100 Mo(t,p) I 168 Er( 30 Si,Xγ) E(level) # Jπ XREF T 1/2 Comments 0+ ABCDEFGHI 11.3 min 2 %β =100. T 1/2 : weighted average of: 11.2 min 3 (1980De06), 11.8 min 4 (1976Ki11), 11.0 min 5 (1966Ga28), 11.0 min 3 (1954Wi32), 11.5 min 5 (1954Fl21) ABCDEFGHI 125 ps 4 T 1/2 : from βγ(t) on mass separated fission products (1991Li39). and time integral perturbed angular correlations with Gammasphere (2005Sm08). Other: 114 ps 3 from 100 Mo( 18 O, 16 Oγ), see also 2001Ra27. β 2 = (2001Ra27). Other: deduced from T 1/2 (1991Li39). Jπ: L(t,p)=2. μ= (1985Me13,1987Bo17,2005St24,1989Ra17). μ: From PAC measurements of the (401γ 296γ) cascade in the β decay of Nb (high spin + low spin isomer); + from 2005Sm08. Other: (2005Sm08) c AB DEFGH 28 ps 11 Jπ: L(t,p)= BCDE G I 12.5 ps 25 β 2 = (1991Li39). β 2 : Deduced from T 1/21/2 (1991Li39). Jπ: L(t,p)=(4) and J=4 from γγ(θ) in 102 Nb β decay (4.3 s) b 6 2+ AB DEFGH Jπ: L(t,p)= c 10 ( 2+ ) G No detailed arguments given for Jπ assignment (2004Hu02) but γ to (3+) AB D Jπ=(3+) based on the γ decay pattern in 102 Nb β decay (4.3 s) (1988GiZX) H Jπ: L(t,p)= BCDE G I H Jπ: L(t,p)= b 8 (4+) B D G Jπ: from (t,pγγ). Based on systematics and branching pattern H Jπ: L(t,p)= B B B H Jπ: L(t,p)= b 10 ( 6+ ) G No detailed arguments given for Jπ assignment by 2004Hu02 but γ to (4+) CD G I 1.8 ps H Jπ: L(t,p)= H Jπ: L(t,p)= & 5 (5 ) I (4+) H Jπ: L(t,p)=(4) H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= H (10+) D Jπ: suggested from level at 2416 kev in (t,p) and (t,pγγ) results in which a 399.3γ from an observed γ ray triplet at 400 kev decays to (8+) level a 5 (6 ) I Jπ: Jπ=(5 ) suggested in 238 U(α,Fγ) (3+) B D Jπ: from γγ(θ) in 102 Nb β decay (4.3 s). Absence in (t,p) suggests positive parity H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= & 5 (7 ) I Jπ: Jπ=(4+) suggested in 238 U(α,Fγ) H H Jπ: L(t,p)=4. Continued on next page (footnotes at end of table) 1774

31 Mo 60 2 NUCLEAR DATA SHEETS Mo 60 2 Adopted Levels, Gammas (continued) 102 Mo Levels (continued) E(level) # Jπ XREF T 1/2 Comments H Jπ: L(t,p)= H Jπ: L(t,p)= H (10+) C G I 1.03 ps 18 Jπ: from γγ and band structure in 248 Cm SF. T 1/2 : from Doppler profile method in 248 Cm SF (1996Sm04) H a 8 (8 ) G Jπ: Jπ=(7 ) suggested in 238 U(α,Fγ) H H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= & 11 (9 ) I Jπ: Jπ=(6+) suggested in 238 U(α,Fγ) H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= H Jπ: L(t,p)= H a 13 (10 ) G Jπ: Jπ=(9 ) suggested in 238 U(α,Fγ) & 15 (11 ) I Jπ: Jπ=(8+) suggested in 238 U(α,Fγ) (12+) G I (12+) C 0.66 ps 12 Jπ: from γγ and band structure in 248 Cm SF. Following 2007La kev level is member of DJ=2 GS Yrast band and not kev level (11 ) G (10+) G (14+) G (13 ) G (12+) G (16+) G (15 ) G (14+) G Unless noted otherwise, determined by the recoil distance Doppler shift method (1975Bo39) from 100 Mo( 18 O, 16 Oγ), except for g.s. and 296 level. Unless noted otherwise, from observed band structure and systematics in 238 U(α,Fγ) and 168 Er( 30 Si,xγ). After contact with S.Lalkowski,( November 14, 2007), one of authors of the 168Er(30Si,Xγ) experiment (2007La03), the evaluator got convincing evidence for the correctness of the level scheme and Jπ assignments for members of band(β) presented by (2007La03) over these of (2004Hu02) in 238 U(α,Fγ). The interpretation of the observed band structure given by (2007La03)is a.o. based on systematics of very reliable data on 98,100 Mo and 104 Ru. Nevertheless an experimental confirmation of the results of 2007La03 would be very welcome. # The level energies were calculated using a least squares procedure using the Adopted (A): Probable member of a ΔJ=2 g.s. Yrast band. (2004Hu02,2007La03). & (B): γ sequence based on (5 ) (2007La03). a (C): γ sequence based on (6 ) (2007La03). b (D): γ band (2004Hu02). c (E): β band (2004Hu02). γ( 102 Mo) E(level) Eγ Iγ Mult. α Comments [E2] B(E2)(W.u.)= [ E2 ] B(E2)(W.u.)= E0 I(696)/I(401)= (1989Es01) [ E2 ] B(E2)(W.u.)= Continued on next page (footnotes at end of table) 1775