ADOPTED LEVELS, GAMMAS for 216At
Author: C. Morse | Citation: Nucl. Data Sheets 209, 409 (2026) | Cutoff date: 5-Aug-2025
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=2003 keV 7 | S(n)= 4558 keV 7 | S(p)= 4491 keV 4 | Q(α)= 7950 keV 3 | ||
| Reference: 2021Wa16 |
| References: | |||
| A | 220Fr α decay | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A | 1(-) | 0.30 ms 3 % α = 100 | |||||
| 44.59 4 | A | (2)- | 44.60 5 | 100 | M1 | 0.0 | 1(-) | |
| 57.12 15 | A | (4)- | 12.5S | 100 | 44.59 | (2)- | ||
| 105.89 5 | A | (0)- | 61.3 1 105.88 5 | 23 3 100 7 | E2 M1 | 44.59 0.0 | (2)- 1(-) | |
| 122.03 16 | A | (5)- | 64.9 1 | 100 | M1 | 57.12 | (4)- | |
| 153.39 8 | A | (2)- | 96.4? 108.8 1 153.4 1 | <15 17.3 23 100 8 | (E2) M1 M1 | 57.12 44.59 0.0 | (4)- (2)- 1(-) | |
| 160.73 5 | A | (1)- | 54.8 1 116.2 1 160.73 5 | 3.9 13 9.2 13 100 5 | M1 M1 | 105.89 44.59 0.0 | (0)- (2)- 1(-) | |
| 169.27 11 | A | (3-) | 112.1 2 124.7 1 | 7 3 100 9 | 57.12 44.59 | (4)- (2)- | ||
| 199.19 16 | A | (3)- | 45.8S 142.1 1 154.5 3 | 100 13 50 13 | M1 M1 | 153.39 57.12 44.59 | (2)- (4)- (2)- | |
| 208.00 11 | A | (1,2)- | 47.3S 163.4 1 208.0 4 | 100 11 3.9 17 | M1 | 160.73 44.59 0.0 | (1)- (2)- 1(-) | |
| 234.59 21 | A | (1,2-) | 128.7 2 | 100 | 105.89 | (0)- | ||
| 254.8 4 | A | 132.8 3 | 100 | 122.03 | (5)- | |||
| 278.15 16 | A | (4)- | 156.1 1 221.1 3 233.6 2 | 100 18 18 5 32 5 | M1 | 122.03 57.12 44.59 | (5)- (4)- (2)- | |
| 302.78 14 | A | (1,2-) | 196.9 2 258.2 2 302.7 4 | 42 10 100 21 63 10 | 105.89 44.59 0.0 | (0)- (2)- 1(-) | ||
| 317 3 | A | |||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 381.08 22 | A | (2-,3-) | 173.0 3 182.1 4 323.9 7 381.0 5 | 19 9 16 6 31 9 100 16 | 208.00 199.19 57.12 0.0 | (1,2)- (3)- (4)- 1(-) | ||
| 400 30 ? | A | (9-) | % α = 100 | |||||
| 421.5 4 | A | 260.5 5 268.3 4 | 78 33 100 33 | 160.73 153.39 | (1)- (2)- | |||
| 479.3? | A | 318.6 4 ? | 100 | 160.73 | (1)- | |||
E(level): From least squares fit to Eγ, unless otherwise noted
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 44.59 | (2)- | 44.60 5 | M1 | 24.60 | α=24.60 35, α(L)=18.73 27, α(M)=4.44 6, α(N)=1.150 17, α(O)=0.2463 35, α(P)=0.0340 5 | |
| 105.89 | (0)- | 61.3 1 | E2 | 76.3 | α=76.3 12, α(L)=56.4 9, α(M)=15.10 24, α(N)=3.89 6, α(O)=0.761 12, α(P)=0.0757 12 | |
| (0)- | 105.88 5 | M1 | 10.27 | α=10.27 14, α(K)=8.30 12, α(L)=1.502 21, α(M)=0.356 5, α(N)=0.0921 13, α(O)=0.01973 28, α(P)=0.00272 4 | ||
| 122.03 | (5)- | 64.9 1 | M1 | 8.18 | α=8.18 12, α(L)=6.23 9, α(M)=1.476 22, α(N)=0.382 6, α(O)=0.0819 12, α(P)=0.01131 17 | |
| 153.39 | (2)- | 96.4 | (E2) | 9.00 | α=9.00 | |
| (2)- | 108.8 1 | M1 | 9.51 | α=9.51 14, α(K)=7.69 11, α(L)=1.388 20, α(M)=0.329 5, α(N)=0.0852 12, α(O)=0.01824 26, α(P)=0.00252 4 | ||
| (2)- | 153.4 1 | M1 | 3.58 | α=3.58 5, α(K)=2.90 4, α(L)=0.518 7, α(M)=0.1227 17, α(N)=0.0318 4, α(O)=0.00681 10, α(P)=0.000940 13 | ||
| 160.73 | (1)- | 116.2 1 | M1 | 7.88 | α=7.88 11, α(K)=6.38 9, α(L)=1.148 16, α(M)=0.272 4, α(N)=0.0705 10, α(O)=0.01509 21, α(P)=0.002084 30 | |
| (1)- | 160.73 5 | M1 | 3.14 | α=3.14 4, α(K)=2.54 4, α(L)=0.454 6, α(M)=0.1075 15, α(N)=0.0279 4, α(O)=0.00596 8, α(P)=0.000824 12 | ||
| 199.19 | (3)- | 142.1 1 | M1 | 4.45 | α=4.45 6, α(K)=3.60 5, α(L)=0.645 9, α(M)=0.1527 22, α(N)=0.0396 6, α(O)=0.00847 12, α(P)=0.001170 17 | |
| (3)- | 154.5 3 | M1 | 3.51 | α=3.51 5, α(K)=2.84 4, α(L)=0.508 8, α(M)=0.1203 18, α(N)=0.0312 5, α(O)=0.00667 10, α(P)=0.000921 14 | ||
| 208.00 | (1,2)- | 163.4 1 | M1 | 2.99 | α=2.99 4, α(K)=2.424 34, α(L)=0.433 6, α(M)=0.1025 14, α(N)=0.0266 4, α(O)=0.00569 8, α(P)=0.000786 11 | |
| 278.15 | (4)- | 156.1 1 | M1 | 3.41 | α=3.41 5, α(K)=2.76 4, α(L)=0.493 7, α(M)=0.1168 16, α(N)=0.0303 4, α(O)=0.00648 9, α(P)=0.000895 13 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 1(-) | 0.30 ms 3 % α = 100 | E(level): May belong to πh9/23νg9/25 configuration (1996Sh05). |
| 44.59 | (2)- | E(level): May belong to πh9/23νg9/25 configuration (1996Sh05). | |
| 57.12 | (4)- | 1994Li10, 1996Sh05 suggest this may be an isomeric state which decays by a 7488-keV α to a 381-keV (6-) level in 212Bi. However, said 381-keV state is not adopted by the most recent 212Bi evaluation (2020Au03). Additionally, it would be surprising for this state to be isomeric when the (2)-, 44.59-keV level has the same proposed configuration. E(level): 1994Li10, 1996Sh05 suggest this may be an isomeric state which decays by a 7488-keV α to a 381-keV (6-) level in 212Bi. However, said 381-keV state is not adopted by the most recent 212Bi evaluation (2020Au03). Additionally, it would be surprising for this state to be isomeric when the (2)-, 44.59-keV level has the same proposed configuration. May belong to πh9/23νg9/25 configuration (1996Sh05). | |
| 105.89 | (0)- | E(level): May belong to πh9/23νg9/25 configuration (1996Sh05). | |
| 122.03 | (5)- | E(level): May belong to πh9/23νg9/25 configuration (1996Sh05). | |
| 153.39 | (2)- | E(level): Possibly a mixture of π(h9/22f7/24)νg9/25 and πh9/23ν(g9/24i11/2) configurations (1996Sh05). | |
| 160.73 | (1)- | E(level): Possibly a mixture of π(h9/22f7/24)νg9/25 and πh9/23ν(g9/24i11/2) configurations (1996Sh05). | |
| 169.27 | (3-) | E(level): May belong to πh9/23νg9/25 configuration (1996Sh05). | |
| 199.19 | (3)- | E(level): Possibly a mixture of π(h9/22f7/24)νg9/25 and πh9/23ν(g9/24i11/2) configurations (1996Sh05). | |
| 278.15 | (4)- | E(level): Possibly a mixture of π(h9/22f7/24)νg9/25 and πh9/23ν(g9/24i11/2) configurations (1996Sh05). |
Levels: All information about excited levels in this nucleus comes from 220Fr α decay
Gammas: All γ data are from 220Fr α decay
Q-value: S(2n)=10507 5, S(2p)=11120 12 (2021Wa16)