ADOPTED LEVELS, GAMMAS for 81Ga
Author: M. Shamsuzzoha Basunia | Citation: Nucl. Data Sheets 199, 271 (2025) | Cutoff date: 1-Sep-2024
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=8664 keV 4 | S(n)= 6476 keV 4 | S(p)= 13268 keV 4 | Q(α)= -11190 keV 3 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 81Zn β- decay (300 MS) | B | 82Zn β-n decay (166 MS) |
| C | 9Be(238U,Fγ) | D | 238U(82Se,xγ),192Os(82Se,xγ) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0 | ABCD | 5/2(-) | 1.219 s 5 % β- = 100 % β-n = 11.8 8 | |||||
| 350.91 7 | ABC | (3/2-) | 60 ps 10 | 350.9 1 | 100 | [M1,E2] | 0 | 5/2(-) |
| 802.47 8 | AB | (3/2-) | 23 ps 16 | 451.6 1 802.4 1 | 100.0 35 24.4 10 | [M1,E2] | 350.91 0 | (3/2-) 5/2(-) |
| 1236.0 9 | D | 1236 1 | 100 | 0 | 5/2(-) | |||
| 1266.6 4 | A | 915.6 4 1266.9 6 | 100 7 26 3 | 350.91 0 | (3/2-) 5/2(-) | |||
| 1341.00 10 | A C | (9/2-) | 1341.0 1 | 100 | 0 | 5/2(-) | ||
| 1400.77 24 | A C | (7/2-) | 1399.6 11 | 100 | 0 | 5/2(-) | ||
| 1435.40 12 | A | 632.9 1 1084.7 5 | 30.0 23 100 7 | 802.47 350.91 | (3/2-) (3/2-) | |||
| 1458.32 15 | A | (5/2-,3/2-) | 655.8 2 ? 1107.4 2 1458.3 2 | 10.4 11 100 5 88 5 | 802.47 350.91 0 | (3/2-) (3/2-) 5/2(-) | ||
| 1464.0 9 ? | D | 228 1 1464 1 | 100 25 83 30 | 1236.0 0 | 5/2(-) | |||
| 1506.32 9 | A | 1155.0 2 1506.4 1 | 8 1 100 6 | 350.91 0 | (3/2-) 5/2(-) | |||
| 1636.22 12 | A | 1285.3 1 | 100 | 350.91 | (3/2-) | |||
| 1936.42 10 | A | (5/2-,3/2-) | ≤ 21 ps | 478.2 2 ? 1585.5 1 1936.3 2 | 4.3 4 86 5 100 6 | 1458.32 350.91 0 | (5/2-,3/2-) (3/2-) 5/2(-) | |
| 1952.39 13 | A C | (11/2-) | 611.4 1 | 100 | 1341.00 | (9/2-) | ||
| 1998.0 12 ? | D | 534 1 | 100 | 1464.0 | ||||
| 2198.1 4 | A | 1847.2 4 | 100 | 350.91 | (3/2-) | |||
| 2285.61 13 | A | 333.3 2 884.8 2 944.4 4 2285.5 2 | 21.6 11 25.7 22 36.0 22 100 6 | 1952.39 1400.77 1341.00 0 | (11/2-) (7/2-) (9/2-) 5/2(-) | |||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 2363.0 12 ? | D | 365 1 899 1 | 100 29 100 37 | 1998.0 1464.0 | ||||
| 2416.4 3 | A | 2065.5 3 | 100 | 350.91 | (3/2-) | |||
| 2686.38 21 | A | 1250.9 2 2686.6 4 | 32 4 100 11 | 1435.40 0 | 5/2(-) | |||
| 2766.0 8 | C | (13/2-) | 813.6 8 | 100 | 1952.39 | (11/2-) | ||
| 2788.5 3 | A | 2788.4 3 | 100 | 0 | 5/2(-) | |||
| 2830.8 3 | A | 894.1 1 ? 2830.7 3 | 56 5 100 13 | 1936.42 0 | (5/2-,3/2-) 5/2(-) | |||
| 3093.0 9 | C | (15/2-) | 327.0 2 | 100 | 2766.0 | (13/2-) | ||
| 3158.0 3 | A | 2807.0 3 | 100 | 350.91 | (3/2-) | |||
| 3189.2 7 | A | 2838.2 7 | 100 | 350.91 | (3/2-) | |||
| 3725.7 6 | A | 3374.7 6 | 100 | 350.91 | (3/2-) | |||
| 3753.7 4 | A | 3402.7 4 | 100 | 350.91 | (3/2-) | |||
| 3909.6 5 | A | 3558.5 5 3909.7 8 | 100 13 67 20 | 350.91 0 | (3/2-) 5/2(-) | |||
| 3949.2 5 | A | 3598.2 5 | 100 | 350.91 | (3/2-) | |||
| 4114.6 7 | A | 3763.6 7 | 100 | 350.91 | (3/2-) | |||
| 4209.2 4 | A | 3858.5 4 4208.5 6 | 100 15 27 5 | 350.91 0 | (3/2-) 5/2(-) | |||
| 4294.92 15 | A | (3/2+,5/2+,7/2+) | 2009.2 2 2358.4 2 3943.9 5 4295.4 4 | 44.0 28 100 7 20 4 42 6 | 2285.61 1936.42 350.91 0 | (5/2-,3/2-) (3/2-) 5/2(-) | ||
| 4301.5 4 | A | 3950.5 4 | 100 | 350.91 | (3/2-) | |||
| 4369.1 4 | A | 4017.8 5 4369.2 4 | 100 14 69 14 | 350.91 0 | (3/2-) 5/2(-) | |||
| 4601.5 5 | A | 4250.5 5 | 100 | 350.91 | (3/2-) | |||
| 4814.2 6 | A | 4463.2 6 | 100 | 350.91 | (3/2-) | |||
| 4880.6 4 | A | (3/2+,5/2+,7/2+) | 4880.4 4 | 100 | 0 | 5/2(-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 4921.0 4 | A | 4570.0 4 | 100 | 350.91 | (3/2-) | |||
| 5113.6 6 | A | 4761.9 10 5113.6 6 | 100 16 68 16 | 350.91 0 | (3/2-) 5/2(-) | |||
| 5131.5 6 | A | 4328.9 6 | 100 | 802.47 | (3/2-) | |||
| 5178.0 3 | A | 4374.6 7 4826.9 4 5178.2 5 | 29 7 53 7 100 13 | 802.47 350.91 0 | (3/2-) (3/2-) 5/2(-) | |||
| 5190.9 7 | A | 4839.8 7 | 100 | 350.91 | (3/2-) | |||
| 5375.1 5 | A | 5024.0 5 | 100 | 350.91 | (3/2-) | |||
| 5422.06 25 | A | 4618.9 7 5072.0 5 5421.6 3 | 100 18 65 12 47 12 | 802.47 350.91 0 | (3/2-) (3/2-) 5/2(-) | |||
| 5475.7 5 | A | 5475.5 5 | 100 | 0 | 5/2(-) | |||
| 5485.3 5 | A | 1185.2 2 ? 5485.1 5 | 17.4 22 100 13 | 4301.5 0 | 5/2(-) | |||
| 5658.4 4 | A | 4856.6 5 5657.4 5 | 100 11 26 8 | 802.47 0 | (3/2-) 5/2(-) | |||
| 5695.0 7 | A | 5694.8 7 | 100 | 0 | 5/2(-) | |||
| 5727.1 4 | A | 5726.9 4 | 100 | 0 | 5/2(-) | |||
| 5831.2 5 | A | 5831.0 5 | 100 | 0 | 5/2(-) | |||
| 5863.7 3 | A | 5863.5 3 | 100 | 0 | 5/2(-) | |||
| 5904.1 8 | A | 5903.9 8 | 100 | 0 | 5/2(-) | |||
| 5936.3 6 | A | 5936.1 6 | 100 | 0 | 5/2(-) | |||
| 5969.4 7 | A | 5969.2 7 | 100 | 0 | 5/2(-) | |||
| 6150.8 7 | A | 6150.5 7 | 100 | 0 | 5/2(-) | |||
| 6213.1 4 | A | 6212.8 4 | 100 | 0 | 5/2(-) | |||
| 6236.4 5 | A | 6236.1 5 | 100 | 0 | 5/2(-) | |||
| 6295.6 5 | A | 6295.3 5 | 100 | 0 | 5/2(-) | |||
| 6405.5 5 | A | 6405.2 5 | 100 | 0 | 5/2(-) | |||
| 6434.9 4 | A | 6434.6 4 | 100 | 0 | 5/2(-) | |||
E(level): From a least-squares fit to the Eγ.
Jπ(level): From shell model calculations except otherwise noted, including 1f5/2, 2p3/2, 2p1/2 and 1g9/2 active proton orbitals and an inert 78Ni core (2007VeZZ - 81Zn β- decay) 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.
T1/2(level): From 81Zn β- decay, using the Advanced Time-Delayed βγγ(t) fast-timing method, except where otherwise noted.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 350.91 | (3/2-) | 60 ps 10 | 350.9 1 | [M1,E2] | 0.0049 | α=0.0049 20, α(K)=0.0043 18, α(L)=4.5×10-4 19, α(M)=6.6E-5 28, α(N)=3.5E-6 14 |
| 802.47 | (3/2-) | 23 ps 16 | 451.6 1 | [M1,E2] | 0.0023 | α=0.0023 7, α(K)=0.0020 6, α(L)=2.1×10-4 7, α(M)=3.1E-5 10, α(N)=1.6E-6 5 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 5/2(-) | 1.219 s 5 % β- = 100 % β-n = 11.8 8 | μ=+1.747 5, Q=-0.048 8 %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 (revised/recommended value (1984Ma39) based on 12.0% 9 (1980Lu04) and overall consistency of data from different laboratories); 12.9% 8 (1993Ru01), and 11.2% 26 (2019To09). Other: 12.7% 12 (deduced by evaluator using Iγ(216)/|Ip=2.9 2 (1981Ho07) and %Iγ(216 in 81Ga β- decay)=36.7 24). 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 (revised/recommended value (1984Ma39) based on 12.0% 9 (1980Lu04) and overall consistency of data from different laboratories); 12.9% 8 (1993Ru01), and 11.2% 26 (2019To09). Other: 12.7% 12 (deduced by evaluator using Iγ(216)/|Ip=2.9 2 (1981Ho07) and %Iγ(216 in 81Ga β- decay)=36.7 24). |
| 1400.77 | (7/2-) | E(level): From (82Se,xγ). Jπ(level): As proposed by 2019Du18 (238U,fγ), based on the assumption of preferred population of yrast states in fission reactions and comparison to shell model calculations. | |
| 1464.0 | XREF: d(1464?). | ||
| 1952.39 | (11/2-) | E(level): From (82Se,xγ). Jπ(level): As proposed by 2019Du18 (238U,fγ), based on the assumption of preferred population of yrast states in fission reactions and comparison to shell model calculations. | |
| 1998.0 | XREF: d(1998?). | ||
| 2363.0 | XREF: d(2363?). | ||
| 2766.0 | (13/2-) | E(level): From (82Se,xγ). Jπ(level): As proposed by 2019Du18 (238U,fγ), based on the assumption of preferred population of yrast states in fission reactions and comparison to shell model calculations. | |
| 3093.0 | (15/2-) | E(level): From (82Se,xγ). Jπ(level): As proposed by 2019Du18 (238U,fγ), based on the assumption of preferred population of yrast states in fission reactions and comparison to shell model calculations. |
| E(level) | E(gamma) | Comments |
| 350.91 | 350.9 | E(γ): weighted average of 351.1 1 from 81Zn β- decay, 350.8 1 from 82Zn β-n decay, and 350.6 3 from (238U,Fγ) |
| 802.47 | 451.6 | E(γ): from 81Zn β- decay. Other: 451.5 3 from 82Zn β-n decay |
| 1236.0 | 1236 | E(γ): from 238U(82Se,Xγ), 192Os(82Se,Xγ). |
| 1341.00 | 1341.0 | E(γ): from 81Zn β- decay. Other: 1340.7 4 from (238U,Fγ) |
| 1400.77 | 1399.6 | E(γ): unweighted average of 1400.7 1 from 81Zn β- decay and 1398.5 7 from (238U,Fγ) |
| 1464.0 | 228 | E(γ): From (82Se,xγ) I(γ): From (82Se,xγ) | 1464 | E(γ): From (82Se,xγ) I(γ): From (82Se,xγ) |
| 1952.39 | 611.4 | E(γ): from 81Zn β- decay. Other: 611.5 5 from (238U,Fγ) |
| 1998.0 | 534 | E(γ): From (82Se,xγ) |
| 2363.0 | 365 | E(γ): From (82Se,xγ) I(γ): From (82Se,xγ) | 899 | E(γ): From (82Se,xγ) I(γ): From (82Se,xγ) |
| 2766.0 | 813.6 | E(γ): From (238U,Fγ) |
| 3093.0 | 327.0 | E(γ): From (238U,Fγ) |