ADOPTED LEVELS, GAMMAS for 76Sr

Authors: Balraj Singh, Jun Chen and Ameenah R. Farhan |  Citation: Nucl. Data Sheets 194, 3 (2024) |  Cutoff date: 8-Jan-2024 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-16000 keV SYS(n)= 15.70×103 keV 22S(p)= 4320 keV 30Q(α)= -2730 keV 40
Reference: 2021WA16

References:
  A  9Be(76Rb,76SrG),(80Y,76SrG)  B  24Mg(54Fe,2nγ)
  C  40Ca(40Ca,2P2NG) 

General Comments:

n=Z=38 nuclide is important from structure point-of-view, pp, nn, strong n-p correlations, waiting point nucleus in astrophysical significance, and large deformation, almost approaching superdeformation.

Identification of 76Sr nuclide: 1990Li25 (in-beam γ-ray spectroscopy, also 1988NaZO and 1988LiZP), 1992Gr09 (half-life measurement), 2004De24 (half-life and delayed-proton study)

No level information is available from radioactive decay of 76Y

Mass measurements: 2005Si34 (also 2004He32), 2001La31

2017Ka01, 2015Sa26, 2011Ro31, 2003La18, 1994Tr08: theoretical structure calculations.

Theoretical calculations: 78 primary references for structure and 15 for decay characteristics retrieved from the NSR database (www.nndc.bnl.gov/nsr/) are listed in this dataset under ’document’ records.

Q-value: Estimated uncertainty=300 for Q(β-) (2021Wa16)

Q-value: Q(ε)=6230 30, S(2n)=29560 110 (syst), S(2p)=6490 30, Q(εp)=2790 40 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
      0.0ABC 0+ 7.89 s 7 
% ε = 100
% εp = 3.4×10-3 8
     
    262.3 2 ABC 2+ 193 ps 25     262.3 2 
  100
E2
      0.0
0+
    746.7 3 ABC (4+)      484.4 2 
  100
(E2)
    262.3
2+
   1446.3 4 ABC (6+)      699.6 2 
  100
(E2)
    746.7
(4+)
   2340.5 4 ABC (8+)      894.2 2 
  100
(E2)
   1446.3
(6+)
   3409.5 11  BC (10+)     1069 1 
  100

   2340.5
(8+)
   4629.5 15  BC (12+)     1220 1 
  100

   3409.5
(10+)
   5978.5 18  BC (14+)     1349 1 
  100

   4629.5
(12+)
   7426.6 21   C (16+)     1448 1 
  100

   5978.5
(14+)
   8943.6 23   C (18+)     1517 1 
  100

   7426.6
(16+)
  10536.6 25   C (20+)     1593 1 
  100

   8943.6
(18+)
  12276.6 27   C (22+)     1740 1 
  100

  10536.6
(20+)
  14229.6 29 ?  C (24+)     1953 1 ?
  100

  12276.6
(22+)

E(level): From Eγ data

Jπ(level): From band assignments for levels with J|>4

E(γ): From 40Ca(40Ca,2p2nγ). Most of corresponding values in 24Mg(54Fe,2nγ) are consistently lower by 1-2 keV, as given under comments

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - g.s. yrast band.
      0.0 0+ 7.89 s 7 
% ε = 100
% εp = 3.4×10-3 8
     
    262.3 2  2+ 193 ps 25     262.3 2 
  100
E2
      0.0
0+
    746.7 3  (4+)      484.4 2 
  100
(E2)
    262.3
2+
   1446.3 4  (6+)      699.6 2 
  100
(E2)
    746.7
(4+)
   2340.5 4  (8+)      894.2 2 
  100
(E2)
   1446.3
(6+)
   3409.5 11  (10+)     1069 1 
  100

   2340.5
(8+)
   4629.5 15  (12+)     1220 1 
  100

   3409.5
(10+)
   5978.5 18  (14+)     1349 1 
  100

   4629.5
(12+)
   7426.6 21  (16+)     1448 1 
  100

   5978.5
(14+)
   8943.6 23  (18+)     1517 1 
  100

   7426.6
(16+)
  10536.6 25  (20+)     1593 1 
  100

   8943.6
(18+)
  12276.6 27  (22+)     1740 1 
  100

  10536.6
(20+)
  14229.6 29 ? (24+)     1953 1 ?
  100

  12276.6
(22+)

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
    262.3 2+ 193 ps 25     262.3 2 E20.0307B(E2)(W.u.)=120 +18-14, α=0.0307

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0.00+ 7.89 s 7 
% ε = 100
% εp = 3.4×10-3 8
The shape of g.s. of 76Sr nuclide was investigated through TAGS measurement of 76Sr decay and derived β-strength function, the latter compared to the calculated shapes for oblate and prolate deformation of the g.s. of 76Sr. The agreement was obtained only for the prolate shape (2004Na16 and 2013Pe13, also 2005Ru07, 2004De24, 2004Na17 and 2003Ma69). From this study estimated β2=0.4 (2004Na16), with a definite prolate shape. This result is in agreement with β2=0.45 3 in 2012Le05, deduced from lifetime measurement of the first 2+ state in 76Sr.
E(level): g.s. yrast band.
    262.32+ 193 ps 25  Deformation parameter β2=0.45 3 (2012Le05).
E(level): g.s. yrast band.
    746.7(4+)   E(level): g.s. yrast band.
   1446.3(6+)   E(level): g.s. yrast band.
   2340.5(8+)   E(level): g.s. yrast band.
   3409.5(10+)   E(level): g.s. yrast band.
   4629.5(12+)   E(level): g.s. yrast band.
   5978.5(14+)   E(level): g.s. yrast band.
   7426.6(16+)   E(level): g.s. yrast band.
   8943.6(18+)   E(level): g.s. yrast band.
  10536.6(20+)   E(level): g.s. yrast band.
  12276.6(22+)   E(level): g.s. yrast band.
  14229.6(24+)   E(level): g.s. yrast band.

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Additional Gamma Comments:

E(level)E(gamma)Comments
    262.3    262.3E(γ): others: 261.6 5 from (76Rb,76Srγ), 261.5 3 from (54Fe,2nγ)
M(γ): Multipolarity is proposed as ΔJ=2, quadrupole (most likely E2) from γ(θ) data in 24Mg(54Fe,2nγ) (2001Fi13), but γ(θ) coefficients or γ(θ) plots are not provided in the paper. For the 262.3γ from the first 2+ state, M2 is ruled out by RUL.
    746.7    484.4M(γ): Multipolarity is proposed as ΔJ=2, quadrupole (most likely E2) from γ(θ) data in 24Mg(54Fe,2nγ) (2001Fi13), but γ(θ) coefficients or γ(θ) plots are not provided in the paper. For the 262.3γ from the first 2+ state, M2 is ruled out by RUL.
   1446.3    699.6E(γ): other: 697.9 5 from (54Fe,2nγ)
M(γ): Multipolarity is proposed as ΔJ=2, quadrupole (most likely E2) from γ(θ) data in 24Mg(54Fe,2nγ) (2001Fi13), but γ(θ) coefficients or γ(θ) plots are not provided in the paper. For the 262.3γ from the first 2+ state, M2 is ruled out by RUL.
   2340.5    894.2E(γ): other: 893.3 5 from (54Fe,2nγ)
M(γ): Multipolarity is proposed as ΔJ=2, quadrupole (most likely E2) from γ(θ) data in 24Mg(54Fe,2nγ) (2001Fi13), but γ(θ) coefficients or γ(θ) plots are not provided in the paper. For the 262.3γ from the first 2+ state, M2 is ruled out by RUL.
   3409.5   1069E(γ): other: 1067 1 from (54Fe,2nγ)
   4629.5   1220E(γ): other: 1218 1 from (54Fe,2nγ)
   5978.5   1349E(γ): also from (54Fe,2nγ)

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