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 4 | S(n)= 6476 keV 5 | S(p)= 13268 keV 5 | Q(α)= -1.154×104 keV SY | ||
Reference: 2012WA38 |
References: | |||
A | 81Zn β- decay | B | 238U(82Se,xγ), 192Os(82Se,xγ) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
0 | AB | (5/2-) | 1.217 s 5 % β- = 100 % β-n = 11.9 7 | ||||
351.1 | A | (3/2-) | 351.1 | 100 | 0 | (5/2-) | |
802.8 | A | (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.
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 | %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). 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). |
E(level) | E(gamma) | Comments |
1236 | 1236 | E(γ): from 238U(82Se,Xγ), 192Os(82Se,Xγ). |
All measurements utilized mass-separated fission products.
Q-value: Note: Current evaluation has used the following Q record 8664 4 6476 4 13267 8 -11830 syst 2003Au03,2008Ha23
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).