ADOPTED LEVELS, GAMMAS for 81Ga

Author: Coral M. Baglin |  Citation: Nucl. Data Sheets 109, 2257 (2008) |  Cutoff date: 15-Aug-2008 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=8664 keV 4S(n)= 6476 keV 5S(p)= 13268 keV 5Q(α)= -1.154×104 keV SY
Reference: 2012WA38

References:
  A  81Zn β- decay  B  238U(82Se,xγ), 192Os(82Se,xγ)

General Comments:

All measurements utilized mass-separated fission products.

Q-value: Note: Current evaluation has used the following Q record

Q-value: Q(β-), S(n), S(p) from mass data for 80Zn, 80Ga, 81Ga and 81Ge from 2008Ha23 (cf. 8320 150, 6920 230, 13430 260, respectively, in 2003Au03).

Q-value: Q(β-n)=3460 190 (2003Au03).

Q-value: ΔQ(α)=590 (2003Au03).









E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)Final Levels
     0AB (5/2-) 1.217 s 5 
% β- = 100
% β-n = 11.9 7
    
   351.1A  (3/2-)      351.1
  100
     0
(5/2-)
   802.8A  (3/2-)      451.7
  100
   351.1
(3/2-)
  1236 B (9/2)-     1236
  100
     0
(5/2-)
  1621.6?A      1621.6
  100
     0
(5/2-)

E(level): From Eγ.

Jπ(level): Shell model calculations including 1f5/2, 2p3/2, 2p1/2 and 1g9/2 active proton orbitals and an inert 78Ni core (2007VeZZ) predict a 5/2- g.s., 3/2- levels at 299 keV and 730 keV, and a 9/2-level at 1374 keV; the latter is tentatively associated with the observed level at 1236 keV (2007De37) and the second 3/2- level with the observed 803-keV level (2007VeZZ). α more extensive series of calculations (2007Ve08) employing different sets of single-particle energies and two-body matrix elements predict somewhat different level energies but lead the authors to conclude that the π 1f5/2 single-particle state lies below the π 2p3/2 state for very neutron-rich nuclei such as 81Ga; the reverse is true for 83Ga.

E(γ): From 81Zn β- decay, except as noted. Uncertainties unstated by authors.

Back to top

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0(5/2-) 1.217 s 5 
% β- = 100
% β-n = 11.9 7
-n is from simultaneous measurement of n-emission rate and β- decay rate. Average of: 10.6% 8 (1986Wa17) (4% statistical and 7% systematic uncertainty); 12.2% 10 (12.0% 9 datum of 1980Lu04 (75% of uncertainty systematic), revised to value recommended in 1984Ma39 (based on overall consistency of data from different laboratories)); 12.9% 8 (1993Ru01).
E(level): %β-n is from simultaneous measurement of n-emission rate and β- decay rate. Average of: 10.6% 8 (1986Wa17) (4% statistical and 7% systematic uncertainty); 12.2% 10 (12.0% 9 datum of 1980Lu04 (75% of uncertainty systematic), revised to value recommended in 1984Ma39 (based on overall consistency of data from different laboratories)); 12.9% 8 (1993Ru01).

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
  1236  1236E(γ): from 238U(82Se,Xγ), 192Os(82Se,Xγ).

Back to top