ADOPTED LEVELS, GAMMAS for 246Am
Authors: E. Browne, J. K. Tuli | Citation: Nucl. Data Sheets 112, 1833 (2011) | Cutoff date: 1-Jan-2011
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=2377 keV SY | S(n)= 4978 keV SY | S(p)= 5473 keV SY | Q(α)= 5.15×103 keV SY | ||
| Reference: 2012WA38 |
| References: | |||
| A | 246Pu β- decay | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A | (7-) | 39 m 3 % β- = 100 | |||||
| 0.0+X | A | 2(-) | 25.0 m 2 % β- = 100 % IT < 0.02 | |||||
| 16.22+X 3 | A | (0-,1-,2-) | 16.23 3 S | 100 | 0.0+X | 2(-) | ||
| 43.81+X 2 | A | (1+) | 4.3 ns 3 | 27.58 2 43.81 2 | 14.1 15 100 5 | (E1) (E1) | 16.22+X 0.0+X | (0-,1-,2-) 2(-) |
| 74.34+X 5 | A | |||||||
| 223.74+X 2 | A | (1+) | 149.42 3 179.94 2 223.75 2 | 0.24 20 41.3 20 100 7 | (M1) (E1) | 74.34+X 43.81+X 0.0+X | (1+) 2(-) | |
| 232.77+X 2 | A | 158.42 3 189.00 4 216.55 4 232.75 2 | 31 7 42 7 100 16 71 11 | 74.34+X 43.81+X 16.22+X 0.0+X | (1+) (0-,1-,2-) 2(-) | |||
| 299.37+X 2 | A | 0-,1 | 66.60 2 75.64 2 255.54 3 299.34 6 | 100 7 71 10 90 7 12 3 | 232.77+X 223.74+X 43.81+X 0.0+X | (1+) (1+) 2(-) | ||
| ≈2000 | 73 µs 10 % SF ≤ 100 | |||||||
E(level): From 246Pu β- decay, unless otherwise noted.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 43.81+X | (1+) | 4.3 ns 3 | 27.58 2 | (E1) | 3.97 | B(E1)(W.u.)=9.3E-5 13, α=3.97 |
| (1+) | 4.3 ns 3 | 43.81 2 | (E1) | 1.19 | B(E1)(W.u.)=0.000165 17, α=1.19 | |
| 223.74+X | (1+) | 179.94 2 | (M1) | 5.86 | α=5.86 | |
| (1+) | 223.75 2 | (E1) | 0.0819 | α=0.0819 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (7-) | 39 m 3 % β- = 100 | Configuration=((π 5/2[642])+(ν 9/2[734])) (1984So03). Jπ(level): From single-particle systematics: for Z=95 the proton configuration is either 5/2[642] or 5/2[523] and for n=151 the neutron configuration is 9/2[734]. β decay to 246Cm suggests a spin-flip transition, therefore proton configuration=(π 5/2[642]) is preferred. |
| 0.0+X | 2(-) | 25.0 m 2 % β- = 100 % IT < 0.02 | %IT from Iγ(153) 6+ to 4+ transition in 246Cm (see 246Am (25 min) decay). E(level): %IT from Iγ(153) 6+ to 4+ transition in 246Cm (see 246Am (25 min) decay). Jπ(level): From single-particle systematics: for Z=95 the proton configuration is either 5/2[642] or 5/2[523] and for n=151 the neutron configuration is 9/2[734]. β decay to 246Cm suggests a spin-flip transition, therefore proton configuration=(π 5/2[642]) is preferred. |
| 2000 | 73 µs 10 % SF ≤ 100 | Fission isomer observed in 244Pu(α,pn) (1972Wo07,2002Si26). E(level): Fission isomer observed in 244Pu(α,pn) (1972Wo07,2002Si26). |
Compilations, calculations:
β-decay: 2009So02, 1992So06
Levels, odd-odd actinides: 1994So16
Long-lived isomers: 1987So10
Two-particle band-head energies: 1984So03
Binding energies: 2005Do12
Spontaneous fission half-life: 2005Re16
Gammas: All γ data are from 246Pu β- decay (1971Mu05)
Q-value: Note: Current evaluation has used the following Q record 2376 18 4976 18 5473 23 5.15×103 syst 2011AuZZ