ADOPTED LEVELS, GAMMAS for 240Np
Author: C. Morse | Citation: Nucl. Data Sheets 206, 359 (2025) | Cutoff date: 27-Sep-2024
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=2191 keV 17 | S(n)= 5066 keV 17 | S(p)= 5545 keV 17 | Q(α)= 4557 keV 22 | ||
| Reference: 2021Wa16 |
| References: | |||
| A | 240U β- decay | B | 240Np IT decay |
| 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 | |||||
| X | AB | (1+) | 7.22 m 2 % IT = 0.12 1 % β- = 99.88 1 | |||||
| X+44.20 8 | A | (1+,2+) | 44.1 1 | 100 | M1(+E2) | | | |
| X+61.42 11 ? | A | 17.2 1 S | | X+44.20 | (1+,2+) | |||
| X+82.60 10 ? | A | 82.6 1 | 100 | | | |||
| X+110.73 9 ? | A | 49.1 2 66.5 1 | 4.5 13 100 3 | X+61.42 X+44.20 | (1+,2+) | |||
| X+111.65 17 ? | A | 50.3 2 | 100 | X+61.42 | ||||
| X+189.68 8 | A | (0-,1) | 78.1 2 128.3 1 145.4 1 189.7 1 | 1.7 4 36.3 8 33.8 8 100 4 | X+111.65 X+61.42 X+44.20 | (1+,2+) | ||
| X+280.02 9 ? | A | (0-,1) | 169.2 1 280.1 1 | 100 7 13.9 9 | X+110.73 | |||
| X+294.8 3 ? | A | (0-,1) | 212.3 5 294.8 3 | 78 16 100 21 | X+82.60 | |||
| X+299.80 15 | A | (0-,1) | 255.6 2 299.8 2 | 30.8 23 100 8 | X+44.20 | (1+,2+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| X+44.20 | (1+,2+) | 44.1 1 | M1(+E2) | 0.13 | 67.0 | α=67.0 10, α(L)=50.2 7, α(M)=12.49 19, α(N)=3.39 5, α(O)=0.826 12, α(P)=0.1556 23, α(Q)=0.01022 15 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| X | (1+) | 7.22 m 2 % IT = 0.12 1 % β- = 99.88 1 | %IT: From 1981Hs02. E(level): %IT: From 1981Hs02. |
| X+189.68 | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+. | |
| X+280.02 | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+. | |
| X+294.8 | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+. | |
| X+299.80 | (0-,1) | Jπ(level): Possible β- feeding (allowed or first-forbidden) from 0+. |
$ See 2023Ni04 for recent mass measurement.
Q-value: S(2n)=11281 17, S(2p)=13156 23 (2021Wa16)