ADOPTED LEVELS, GAMMAS for 76Ga

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-)=6916.3 keV 20S(n)= 5907.3 keV 21S(p)= 11026.7 keV 28Q(α)= -8938.6 keV 24
Reference: 2021WA16

References:
  A  76Zn β- decay (5.7 S) 

General Comments:

1961Ta08: production and identification of 76Ga in 76Ge(n,p) reaction using fast neutron beam from the University of Tokyo cyclotron facility. Measured Eβ, Eγ and half-life of the decay of 76Ga. Later studies of 76Ga decay: 1970OsZZ, 1971Ca39, 1974Gr29, 1981Ru07

2011Ma45: 76Ga produced by neutron induced fission of a thick uranium carbide target. Neutrons were produced by 1.4 GeV protons on tantalum. Ga isotopes were ionized using RILIS laser ion source. Laser spectroscopy was performed on the Ga isotopes at ISOLDE, CERN. The g.s. spins and moments were extracted from measured hyperfine spectra. Comparison with shell model calculations.

2012Pr11: measured optical spectra, hyperfine coefficients, isotope shifts, mean-square charge radii using collinear laser spectroscopy. RILIS source at ISOLDE, CERN facility

2016Do05: 76Ga activity produced in 9Be(76Ge32+,X), E=130 MeV/nucleon, and separated by A1900 fragment separator at NSCL-MSU. Secondary beam consisting of 73% 76Ga31+ and 27% 74Zn30+ was passed through the NSCL gas stopping station where primarily the 76Ga31+ beam was extracted and stopped in the gas cell. α scan of the activity as a function of mass of the extracted ions showed the molecular ion [76Ga(H2O)]+ as the main activity delivered to the counting station. The 76Ga ions with an energy of ≈40 keV and intensity of ≈500 particles/s were implanted into an aluminum target foil. Measured total absorption gamma-ray (TAS) spectrum using segmented NaI(Tl)(SuN) detector, and electrons from 76Ga β- decay by a silicon surface barrier detector located inside the bore hole of the SuN detector. Also detected were βγ-coincidences.

Mass measurement: 2007Gu09 (also 2005Gu36), 1981Al20

2020Ve08, 2012Sr01: thoeretical structure calculations

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

Q-value: S(2n)=14390 4, S(2p)=24868 6 (2021Wa16)










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0A 2(-) 30.5 s 4 
% β- = 100
     
   172.29 3 A (1+,2+,3+)      172.44 5 
  100
(D)
     0.0
2(-)
   199.50 3 A 1+ 34 ns 8     199.2 5 
  100
(E1)
     0.0
2(-)
   275.28 3 A 1+       75.9 5 
   102.88 5 
   275.34 5 
  100 16 
    5.3 6 
   20.0 12 
(M1)
(E2)

   199.50
   172.29
     0.0
1+
(1+,2+,3+)
2(-)
   281.57 3 A (0-:3+)       82.1 3 
   109.23 8 
   281.56 5 
   90 8 
   15 3 
  100 8 



   199.50
   172.29
     0.0
1+
(1+,2+,3+)
2(-)
   369.81 6 A (0:3+)       88.3 2 
    94.53 5 
   33 11 
  100 11 


   281.57
   275.28
(0-:3+)
1+
   565.53 3 A 1+      290.23 8 
   365.98 5 
   393.20 5 
   565.52 5 
   12 2 
  100 4 
   16 3 
   21 3 




   275.28
   199.50
   172.29
     0.0
1+
1+
(1+,2+,3+)
2(-)
   680.83 3 A (0-:3+)      405.5 1 
   481.42 5 
   508.8 2 
   680.70 4 
   10 3 
   40 4 
  100 20 
   20 3 




   275.28
   199.50
   172.29
     0.0
1+
1+
(1+,2+,3+)
2(-)
   781.55 5 A (0:3+)      609.29 5 
  100

   172.29
(1+,2+,3+)
  1030.30 3 A 1+      748.72 5 
   755.03 2 
   830.7 5 
   857.98 5 
  1030.26 5 
   70 8 
  100 6 
   41 4 
   28 4 
   17 1 





   281.57
   275.28
   199.50
   172.29
     0.0
(0-:3+)
1+
1+
(1+,2+,3+)
2(-)
  1106.03 8 A (1)      736.21 6 
  100

   369.81
(0:3+)
  1545.44 3 A 1+      763.9 1 
   864.59 5 
   979.85 5 
  1263.89 5 
  1345.94 5 
  1373.1 1 
  1545.48 5 
    2.2 11 
   22 3 
   21 3 
   89 11 
  100 11 
    3.9 11 
   54 3 







   781.55
   680.83
   565.53
   281.57
   199.50
   172.29
     0.0
(0:3+)
(0-:3+)
1+
(0-:3+)
1+
(1+,2+,3+)
2(-)
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
  1568.12 4 A 1+      786.5 1 
  1286.53 5 
  1368.59 4 
  1395.94 7 
    6 3 
  100 7 
   42 4 
   21 3 




   781.55
   281.57
   199.50
   172.29
(0:3+)
(0-:3+)
1+
(1+,2+,3+)
  1621.22 8 A (1+)     1251.40 5 
  100

   369.81
(0:3+)
  1750.14 3 A 1+      968.7 2 
  1069.22 5 
  1184.49 8 
  1468.53 5 
  1550.60 7 
  1578.00 5 
  1750.06 6 
    5.8 8 
   38 4 
   11 3 
  100 8 
   15 2 
   23 3 
   19 2 







   781.55
   680.83
   565.53
   281.57
   199.50
   172.29
     0.0
(0:3+)
(0-:3+)
1+
(0-:3+)
1+
(1+,2+,3+)
2(-)
  1810.50 6 A (1+)     1610.99 5 
  100

   199.50
1+
  1825.99 7 A 1+     1456.16 4 
  100

   369.81
(0:3+)
  1896.05 6 A (1)     1723.74 5 
  100

   172.29
(1+,2+,3+)
  1977.41 6 A (1+)     1695.7 1 
  1702.12 9 
  1977.5 1 
   64 21 
  100 14 
   57 14 



   281.57
   275.28
     0.0
(0-:3+)
1+
2(-)
  2091.02 4 A 1+     1309.6 1 
  1410.2 1 
  1815.62 5 
  1918.9 1 
  2091.0 1 
    3.1 12 
    6.2 12 
   55 3 
    5.6 12 
  100 12 





   781.55
   680.83
   275.28
   172.29
     0.0
(0:3+)
(0-:3+)
1+
(1+,2+,3+)
2(-)
  2166.64 12 A (1+)     1796.8 1 
  100

   369.81
(0:3+)
  2422.73 11 A 1+     2223.2 1 
  100

   199.50
1+
  2602.44 11 A 1+     2402.9 1 
  100

   199.50
1+

E(level): From least-squares fit to Eγ data

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
   172.29 (1+,2+,3+)      172.44 5 (D)0.014α=0.014 2
   199.50 1+ 34 ns 8     199.2 5 (E1)0.00815B(E1)(W.u.)=1.40E-6 +43-27, α=0.00815 13
   275.28 1+       75.9 5 (M1)0.149α=0.149
1+      102.88 5 (E2)0.629α=0.629

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.02(-) 30.5 s 4 
% β- = 100
μ=-0.945 4 (2011Ma45,2019StZV), Q=+0.329 19 (2011Ma45,2021StZZ)
Mean-square charge radius <r2>(71Ga,76Ga)=+0.276 5 64 (2012Pr11), first uncertainty is statistical, second is systematic.
   199.501+ 34 ns 8  Structure of this isomeric state is proposed by 2022Ch09 as a highly-mixed state of negative-parity proton configurations coupled to 1/2- neutron configurations.
   281.57(0-:3+)   Jπ(level): γ to/from 1+. log ft value (considered only approximate for this level) from 0+ suggests J=0,1. In some cases γ to 2(-) g.s. does not allow 0+.
   369.81(0:3+)   Jπ(level): γ to/from 1+. log ft value (considered only approximate for this level) from 0+ suggests J=0,1. In some cases γ to 2(-) g.s. does not allow 0+.
   680.83(0-:3+)   Jπ(level): γ to/from 1+. log ft value (considered only approximate for this level) from 0+ suggests J=0,1. In some cases γ to 2(-) g.s. does not allow 0+.
   781.55(0:3+)   Jπ(level): γ to/from 1+. log ft value (considered only approximate for this level) from 0+ suggests J=0,1. In some cases γ to 2(-) g.s. does not allow 0+.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   172.29   172.44M(γ): From 1986Ek01 in 76Zn β- decay, probably deduced by the authors based on their measured ce data which however are not given in the paper
   199.50   199.2M(γ): From 1986Ek01 in 76Zn β- decay, probably deduced by the authors based on their measured ce data which however are not given in the paper
   275.28    75.9M(γ): From 1986Ek01 in 76Zn β- decay, probably deduced by the authors based on their measured ce data which however are not given in the paper
   102.88M(γ): From 1986Ek01 in 76Zn β- decay, probably deduced by the authors based on their measured ce data which however are not given in the paper
   680.83   680.70E(γ): somewhat poor fit in the level scheme, level-energy difference=680.82
  1750.14  1578.00E(γ): somewhat poor fit in the level scheme, level-energy difference=1577.82

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