ADOPTED LEVELS, GAMMAS for 240Np
Authors: Balraj Singh, E. Browne | Citation: Nucl. Data Sheets 109, 2439 (2008) | Cutoff date: 31-Jul-2008
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=2191 keV 17 | S(n)= 5066 keV 18 | S(p)= 5545 keV 18 | Q(α)= 4559 keV 23 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 240U β- decay (14.1 H) | B | 240Np IT decay (7.22 M) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | AB | (5+) | 61.9 m 2 % β- = 100 | |||||
| 0+X | AB | (1+) | 7.22 m 2 % IT = 0.12 1 % β- = 99.88 1 | |||||
| 44.17+X 6 | A | (1+) | 44.10 7 | 100 | M1(+E2) | 0+X | (1+) | |
| 61.4+X 1 ? | A | 17.2S | | 44.17+X | (1+) | |||
| 82.6+X 1 ? | A | 82.6 1 | 100 | 0+X | (1+) | |||
| 110.7+X 1 ? | A | 49.1 2 66.5 1 | 4.5 12 100 10 | 61.4+X 44.17+X | (1+) | |||
| 111.6+X 2 ? | A | 50.3 2 | 100 | 61.4+X | ||||
| 189.7+X 1 | A | (0-,1) | 78.1 2 128.3 1 145.4 1 189.7 1 | 1.7 4 36.5 8 34.0 8 100 4 | 111.6+X 61.4+X 44.17+X 0+X | (1+) (1+) | ||
| 280.0+X 1 ? | A | (0-,1) | 169.2 1 280.1 1 | 100 7 13.9 9 | 110.7+X 0+X | (1+) | ||
| 294.8+X 3 ? | A | (0-,1) | 212.3 5 294.8 3 | 78 15 100 21 | 82.6+X 0+X | (1+) | ||
| 299.8+X 2 | A | (0-,1) | 255.6 2 299.8 2 | 30.8 23 100 8 | 44.17+X 0+X | (1+) (1+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 44.17+X | (1+) | 44.10 7 | M1(+E2) | 0.07 7 | 59 | α=59 10, α(L)=44 7, α(M)=10.9 20, α(N)=3.0 6, α(O)=0.73 13, α(P)=0.139 20, α(Q)=0.01030 18, α(N+)=3.8 7 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0+X | (1+) | 7.22 m 2 % IT = 0.12 1 % β- = 99.88 1 | %IT: fractional decay to the ground state was confirmed by observing growth and decay of 566.3γ, the strongest transition following decay of 61.9-min 240Np (1981Hs02). 1986LoZT adopted %IT=0.11 3 from an older Nuclear Data Sheets evaluation. |
| 189.7+X | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+; log ft limit disfavors Jπ=0+. | |
| 280.0+X | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+; log ft limit disfavors Jπ=0+. | |
| 294.8+X | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+; log ft limit disfavors Jπ=0+. | |
| 299.8+X | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+; log ft limit disfavors Jπ=0+. |
| E(level) | E(gamma) | Comments |
| 44.17+X | 44.10 | M(γ): from 240U β- decay. |