ADOPTED LEVELS, GAMMAS for 81As
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-)=3855.7 keV 28 | S(n)= 8390 keV 4 | S(p)= 10287 keV 3 | Q(α)= -8966 keV 4 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 81Ge β- decay (6.4 S) | B | 81Ge β- decay (7.6 S) |
| C | 82Se(μ-,nγ) | D | 82Se(d,3He) |
| E | 82Se(t,α) | F | 208Pb(16O,xγ) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0 | ABCDEF | 3/2- | 33.3 s 10 % β- = 100 | |||||
| 93.09 5 | AB D | (3/2)- | 93.10 10 | 100 | M1+E2 | 0 | 3/2- | |
| 290.41 4 | AB DE | (3/2)- | 197.30 5 290.35 5 | 100 6 52 4 | (M1) | 93.09 0 | (3/2)- 3/2- | |
| 335.97 4 | ABCDEF | (5/2)- | < 0.7 ns | 242.84 9 335.98 5 | 4.4 5 100 4 | M1,E2 | 93.09 0 | (3/2)- 3/2- |
| 737.71 4 | AB DEF | (5/2)- | 401.75 5 737.74 5 | 40 4 100 5 | 335.97 0 | (5/2)- 3/2- | ||
| 757 9 | E | 7/2+,9/2+ | ||||||
| 758.43 7 | AB | (5/2-,3/2+) | 467.98 6 665.9 3 758.4 2 | 46 14 41 100 8 | 290.41 93.09 0 | (3/2)- (3/2)- 3/2- | ||
| 864.23 13 | AB | (1/2-,3/2-,5/2-) | 771.26 15 | 100 | 93.09 | (3/2)- | ||
| 1015 5 | DE | 1/2-,3/2- | ||||||
| 1042.02 7 | AB E | (7/2-) | 706.07 10 751.51 10 | 72 20 100 7 | 335.97 290.41 | (5/2)- (3/2)- | ||
| 1083.38 6 | A | (3/2+,5/2,7/2-) | 747.41 10 792.94 6 990.5 2 1083.3 2 | 100 13 51 17 13.6 25 29 13 | 335.97 290.41 93.09 0 | (5/2)- (3/2)- (3/2)- 3/2- | ||
| 1128.95 6 | A EF | (9/2-) | 391.34 11 792.94 6 | 9.2 9 100 16 | 737.71 335.97 | (5/2)- (5/2)- | ||
| 1195.03 9 | A F | 7/2 | 859.13 10 | 100 | 335.97 | (5/2)- | ||
| 1496 6 | DE | 1/2-,3/2- | ||||||
| 1613 5 ? | DE | 1/2+ | ||||||
| 1613.54 9 | A F | (9/2+) | 875.84 10 | 100 | 737.71 | (5/2)- | ||
| 1672 5 | DE | (5/2-,7/2-) | ||||||
| 1730.8 4 | F | (11/2-) | 602.0 4 | 100 | 1128.95 | (9/2-) | ||
| 1869.88 16 | AB | (5/2-,7/2-,9/2-) | 1005.7 2 | 100 | 864.23 | (1/2-,3/2-,5/2-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1879 8 | E | 7/2+,9/2+ | ||||||
| 1914.92 13 | A | (7/2,9/2-) | 1156.41 15 | 100 | 758.43 | (5/2-,3/2+) | ||
| 2008.28 21 | A | (7/2,5/2-,9/2-) | 1672.3 2 | 100 | 335.97 | (5/2)- | ||
| 2077 13 | E | (-) | ||||||
| 2142.08 9 | A F | (7/2+) | 1013.0 2 1058.6 2 1100.2 2 | 100 16 40 4 24.7 27 | 1128.95 1083.38 1042.02 | (9/2-) (3/2+,5/2,7/2-) (7/2-) | ||
| 2197.1 4 | A | (7/2-) | 2104.0 4 | 100 | 93.09 | (3/2)- | ||
| 2250.95 16 | A F | (13/2+) | 637.4 2 | 100 | 1613.54 | (9/2+) | ||
| 2359.3 4 | F | (13/2-) | 628.6 4 1230.2 4 | 17 7 100 27 | 1730.8 1128.95 | (11/2-) (9/2-) | ||
| ≈2518? | E | |||||||
| 2624.51 6 | A F | (9/2+) | 482.4 1 709.3 3 1429.53 10 1495.53 5 1582.27 15 1886.8 2 | 46 4 23 5 40 8 100 18 32 7 7.1 11 | 2142.08 1914.92 1195.03 1128.95 1042.02 737.71 | (7/2+) (7/2,9/2-) 7/2 (9/2-) (7/2-) (5/2)- | ||
| 2723 9 | E | 1/2-,3/2- | ||||||
| 2758.26 8 | A F | (11/2+) | 133.70 6 507.3 2 616.3 2 1144.75 15 1629.45 13 | 98 23 16 8 27 5 100 40 69 13 | 2624.51 2250.95 2142.08 1613.54 1128.95 | (9/2+) (13/2+) (7/2+) (9/2+) (9/2-) | ||
| 2777.4 3 | A | (7/2,9/2-) | 2441.4 3 | 100 | 335.97 | (5/2)- | ||
| 2862.46 17 | AB | (7/2,9/2-) | 2103.9 3 2526.5 2 | 69 10 100 10 | 758.43 335.97 | (5/2-,3/2+) (5/2)- | ||
| 2911.94 12 | AB | (7/2+,9/2+) | 1869.8 2 2174.32 15 | 81 15 100 19 | 1042.02 737.71 | (7/2-) (5/2)- | ||
| 2965.91 9 | A | (7/2+) | 1882.51 8 2207.5 3 2629.9 2 | 100 22 20.6 28 36 6 | 1083.38 758.43 335.97 | (3/2+,5/2,7/2-) (5/2-,3/2+) (5/2)- | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 2974.8 3 | F | (13/2+) | 216.5 3 723.8 4 | 100 22 56 22 | 2758.26 2250.95 | (11/2+) (13/2+) | ||
| 2999 3 | E | 1/2-,3/2- | ||||||
| 3098 6 | E | 5/2-,7/2- | ||||||
| 3126.4 4 | F | (15/2+) | 151.6 3 | 100 | 2974.8 | (13/2+) | ||
| 3136.28 13 | B | (3/2+) | 2377.4 4 2800.2 2 2845.8 2 3136.6 3 | 60 18 100 11 49 7 30 5 | 758.43 335.97 290.41 0 | (5/2-,3/2+) (5/2)- (3/2)- 3/2- | ||
| 3195.42 18 | B | (3/2+) | 2331.3 2 2436.6 2859.1 2904.7 3 3195.1 | 85 9 ≈18.9 ≈18.9 34 6 100 | 864.23 758.43 335.97 290.41 0 | (1/2-,3/2-,5/2-) (5/2-,3/2+) (5/2)- (3/2)- 3/2- | ||
| 3290.2 3 | A | (7/2,9/2,11/2) | 665.7 3 | 100 | 2624.51 | (9/2+) | ||
| 3290.9 5 | F | (17/2+) | 164.5 3 | 100 | 3126.4 | (15/2+) | ||
| 3292.4 5 | F | (17/2-) | 933.1 3 | 100 | 2359.3 | (13/2-) | ||
| 3306 9 | E | |||||||
| 3368.02 14 | AB | (7/2+,9/2+,11/2+) | 456.2 2 1225.8 2 1453.1 2 | 97 17 100 21 69 14 | 2911.94 2142.08 1914.92 | (7/2+,9/2+) (7/2+) (7/2,9/2-) | ||
| 3422.0 11 | F | (17/2+) | 1171 1 | 100 | 2250.95 | (13/2+) | ||
| 3480 7 | E | 1/2+ | ||||||
| 3531.13 21 | B | (1/2-,3/2) | 3195.1 2 | 100 | 335.97 | (5/2)- | ||
| 3562.72 15 | B | (1/2+,3/2+) | 3469.5 2 3562.7 2 | 54 6 100 7 | 93.09 0 | (3/2)- 3/2- | ||
| 3596 12 | E | 1/2+ | ||||||
| 3669.5 6 | F | (21/2-) | 377.1 4 | 100 | 3292.4 | (17/2-) | ||
| 3742 9 | E | |||||||
| 3818 12 | E | 1/2-,3/2- | ||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 3914 8 | E | (1/2+,5/2-,7/2-) | ||||||
| 3995 7 | E | (1/2+,5/2-,7/2-) | ||||||
E(level): From a least-squares fit to Eγ for levels deexcited by γ rays; from (t,α) for levels excited only in that reaction and weighted average from (t,α) and (d,3He) for levels excited in those two reactions only.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - Based on (5/2)- | |||||||
| 335.97 4 | (5/2)- | < 0.7 ns | |||||
| 1128.95 6 | (9/2-) | 391.34 11 792.94 6 | 9.2 9 100 16 | 737.71 335.97 | (5/2)- (5/2)- | ||
| 2359.3 4 | (13/2-) | 628.6 4 1230.2 4 | 17 7 100 27 | 1730.8 1128.95 | (11/2-) (9/2-) | ||
| 3292.4 5 | (17/2-) | 933.1 3 | 100 | 2359.3 | (13/2-) | ||
| 3669.5 6 | (21/2-) | 377.1 4 | 100 | 3292.4 | (17/2-) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 2 - Based on (9/2+) | |||||||
| 1613.54 9 | (9/2+) | ||||||
| 2250.95 16 | (13/2+) | 637.4 2 | 100 | 1613.54 | (9/2+) | ||
| 3422.0 11 | (17/2+) | 1171 1 | 100 | 2250.95 | (13/2+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 3 - Based on (11/2+). | |||||||
| 2758.26 8 | (11/2+) | ||||||
| 2974.8 3 | (13/2+) | 216.5 3 723.8 4 | 100 22 56 22 | 2758.26 2250.95 | (11/2+) (13/2+) | ||
| 3126.4 4 | (15/2+) | 151.6 3 | 100 | 2974.8 | (13/2+) | ||
| 3290.9 5 | (17/2+) | 164.5 3 | 100 | 3126.4 | (15/2+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 93.09 | (3/2)- | 93.10 10 | M1+E2 | 0.24 6 | 0.160 | α=0.160 26, α(K)=0.140 22, α(L)=0.0166 31, α(M)=0.0025 5, α(N)=0.000182 31 | |
| 290.41 | (3/2)- | 197.30 5 | (M1) | 0.01490 | α=0.01490 21, α(K)=0.01326 19, α(L)=0.001411 20, α(M)=0.0002153 30, α(N)=1.633×10-5 23 | ||
| 335.97 | (5/2)- | < 0.7 ns | 335.98 5 | M1,E2 | 0.0067 | α=0.0067 27, α(K)=0.0059 24, α(L)=6.4×10-4 27, α(M)=1.0E-4 4, α(N)=7.2E-6 29 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 335.97 | (5/2)- | < 0.7 ns | E(level): Based on (5/2)-. |
| 1128.95 | (9/2-) | E(level): Based on (5/2)-. Doublet in (t,α). | |
| 1195.03 | 7/2 | Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 1613.54 | (9/2+) | E(level): Based on (9/2+). | |
| 1730.8 | (11/2-) | Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 1869.88 | (5/2-,7/2-,9/2-) | XREF: B(?). | |
| 2077 | (-) | E(level): Doublet in (t,α). | |
| 2250.95 | (13/2+) | E(level): Based on (9/2+). Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 2359.3 | (13/2-) | E(level): Based on (5/2)-. Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 2624.51 | (9/2+) | Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 2758.26 | (11/2+) | E(level): Based on (11/2+). | |
| 2862.46 | (7/2,9/2-) | XREF: B(?). | |
| 2911.94 | (7/2+,9/2+) | XREF: B(?). | |
| 2974.8 | (13/2+) | E(level): Based on (11/2+). Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 3126.4 | (15/2+) | E(level): Based on (11/2+). Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 3290.9 | (17/2+) | E(level): Based on (11/2+). Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 3292.4 | (17/2-) | E(level): Based on (5/2)-. Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 3306 | E(level): Doublet in (t,α). | ||
| 3368.02 | (7/2+,9/2+,11/2+) | XREF: B(?). | |
| 3422.0 | (17/2+) | E(level): Based on (9/2+). Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). | |
| 3596 | 1/2+ | E(level): Doublet in (t,α). | |
| 3669.5 | (21/2-) | E(level): Based on (5/2)-. Jπ(level): Based on γ transition multipolarity determined from γγ(θ) measurements (16O,xγ). |
| E(level) | E(gamma) | Comments |
| 290.41 | 197.30 | I(γ): From 81Ge β- decay (7.6 s) | 290.35 | I(γ): From 81Ge β- decay (7.6 s) |
| 737.71 | 401.75 | I(γ): weighted average of 48 14 from 81Ge β- decay (6.4 s), 41 4 from 81Ge β- decay (7.6 s), and 34 9 from (16O,Xγ) |
| 758.43 | 665.9 | I(γ): From 81Ge β- decay (7.6 s) |
| 1128.95 | 391.34 | I(γ): weighted average of 9.3 9 from 81Ge β- decay (6.4 s) and 8 4 from (16O,Xγ) | 792.94 | I(γ): From (16O,xγ) |
| 1730.8 | 602.0 | E(γ): From (16O,xγ) |
| 2142.08 | 1013.0 | E(γ): Other: 1013.4 6 (16O,xγ) |
| 2250.95 | 637.4 | E(γ): weighted average of 637.2 2 (81Ge β- decay (6.4 s)) and 637.6 2 (16O,xγ) |
| 2359.3 | 628.6 | E(γ): From (16O,xγ) I(γ): From (16O,xγ) | 1230.2 | E(γ): From (16O,xγ) I(γ): From (16O,xγ) |
| 2624.51 | 482.4 | E(γ): Other: 482.4 4 (16O,xγ) |
| 2758.26 | 1629.45 | I(γ): weighted average of 75 9 from 81Ge β- decay (6.4 s) and 40 20 from (16O,Xγ) |
| 2862.46 | 2103.9 | I(γ): From 81Ge β- decay (7.6 s) | 2526.5 | I(γ): From 81Ge β- decay (7.6 s) |
| 2974.8 | 216.5 | E(γ): From (16O,xγ) I(γ): From (16O,xγ) | 723.8 | E(γ): From (16O,xγ) I(γ): From (16O,xγ) |
| 3126.4 | 151.6 | E(γ): From (16O,xγ) |
| 3136.28 | 2377.4 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) | 2800.2 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) | 2845.8 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) | 3136.6 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) |
| 3195.42 | 2331.3 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) | 2436.6 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) | 2859.1 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) | 2904.7 | E(γ): From 81Ge β- decay (7.6 s) I(γ): From 81Ge β- decay (7.6 s) | 3195.1 | E(γ): Multiply placed with intensity suitably divided. From 81Ge β- decay (7.6 s) I(γ): Multiply placed with intensity suitably divided. From 81Ge β- decay (7.6 s) |
| E(level) | E(gamma) | Comments |
| 3290.9 | 164.5 | E(γ): From (16O,xγ) |
| 3292.4 | 933.1 | E(γ): From (16O,xγ) |
| 3422.0 | 1171 | E(γ): From (16O,xγ) |
| 3531.13 | 3195.1 | E(γ): Multiply placed with intensity suitably divided. From 81Ge β- decay (7.6 s) I(γ): Multiply placed with intensity suitably divided |
| 3562.72 | 3469.5 | E(γ): From 81Ge β- decay (7.6 s) | 3562.7 | E(γ): From 81Ge β- decay (7.6 s) |
| 3669.5 | 377.1 | E(γ): From (16O,xγ) |
Other Reactions:
238U(82Se,X), E=505 MeV (2005Lu07); measured γ spectrum of 81As reaction product (no details given).
82Se(μ,νnγ) (2008Zi03, 2006Eg04); measured muon lifetime and capture rate for 82Se; observed 336γ from 81As.
Cumulative or Independent mass yield distribution in the thermal neutron-induced fission of 232U, 237Np, 239Pu, and 241Am are reported in 2022Na14, 2022Na04, 2022Na21, and 2022Na25, respectively, including 81As. Also similar yields are reported in 2021Na07 and 2021Na10.
In-flight fission of 238U, E=950 MeV/nucleon, on Be yields 81As production cross section of 1 mb 1 (2019Pe09).
Q-value: S(2n)=15040 6, S(2p)=24562.9 29 (2021Wa16)