ADOPTED LEVELS for 228Np
Author: Khalifeh Abusaleem | Citation: Nucl. Data Sheets 116, 163 (2014) | Cutoff date: 31-Dec-2012
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-2483 keV 59 | S(n)= 7038 keV 88 | S(p)= 2715 keV 53 | Q(α)= 7309 keV 60 | ||
| Reference: 2012WA38 |
| E(level) (keV) | T1/2(level) |
| 0.0 | 61.4 s 14 % ε = 60 7 % α = 40 7 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 61.4 s 14 % ε = 60 7 % α = 40 7 | Other: %α=83 +17-36 (2003Ni10). |
Compilations, systematics:
Level structure in odd-odd actinides: 1994So16
Assignment: 233U(50-MeV p,6n), ion chem, observation of 216Fr (from α-decay) and 212Po (from ε decay) activities (1994Kr13).
Others: 1966Ku13 report a SF activity with T1/2=60 s 5 produced by 209Bi (≈100-MeV 22Ne) and assign this activity, on theoretical grounds, as a possible precursor of an ε-delayed isomer in 228U or 227U (from 237Np parent). 1978SoZZ report T1/2=52 s 8 for this same activity produced by 209Bi(115-MeV 22Ne). Five events of α-decay are observed in 2003Ni10. The following partial half-lives are measured in 2003Ni10 following the Geiger-Nuttal curve:
Q(α)=7183, T1/2(α)=20.1 s
Q(α)=7062, T1/2(α)=88.7 s
Q(α)=7126, T1/2(α)=135.8 s
Q(α)=7177, T1/2(α)=24.3 s
Q(α)=7065, T1/2(α)=10.4 s