ADOPTED LEVELS, GAMMAS for 246Am
Author: C.D. Nesaraja | Citation: Nucl. Data Sheets 198, 449 (2024) | Cutoff date: 31-Jul-2022
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=2377 keV SY | S(n)= 4978 keV SY | S(p)= 5473 keV SY | Q(α)= 5150 keV SY | ||
| Reference: 2021WA16 |
| References: | |||
| A | 246Pu β- decay | B | 244Pu(α,PN) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | (7-) | 39 m 3 % β- = 100 | ||||||
| 0.0+X | A | (2-) | 25.0 m 2 % IT = ? % β- = 100 | |||||
| 16.22+X 3 | A | (0-,1-,2-) | 16.23 3 S | 100 | 0.0+X | (2-) | ||
| 43.797+X 12 | 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-) |
| 74.323+X 24 | A | |||||||
| 223.733+X 14 | A | (1+) | 149.42 3 179.94 2 223.75 2 | 0.24 20 41.3 20 100 7 | (M1) (E1) | 74.323+X 43.797+X 0.0+X | (1+) (2-) | |
| 232.754+X 14 | A | 158.42 3 189.00 4 216.55 4 232.75 2 | 31 7 42 7 100 16 71 11 | 74.323+X 43.797+X 16.22+X 0.0+X | (1+) (0-,1-,2-) (2-) | |||
| 299.358+X 16 | A | 0,1 | 66.60 2 75.64 2 255.54 3 299.34 6 | 100 7 71 10 90 7 12 3 | 232.754+X 223.733+X 43.797+X 0.0+X | (1+) (1+) (2-) | ||
| ≈2000 | B | 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 |
| 43.797+X | (1+) | 4.3 ns 3 | 27.58 2 | (E1) | 3.90 | B(E1)(W.u.)=9.4E-5 +11-10, α=3.90 6, α(L)=2.89 4, α(M)=0.759 11, α(N)=0.2030 29, α(O)=0.0461 7, α(P)=0.00608 9, α(Q)=0.0001418 20 |
| (1+) | 4.3 ns 3 | 43.81 2 | (E1) | 1.175 | B(E1)(W.u.)=1.66E-4 +14-12, α=1.175 17, α(L)=0.877 12, α(M)=0.2220 31, α(N)=0.0596 8, α(O)=0.01394 20, α(P)=0.002061 29, α(Q)=5.75E-5 8 | |
| 223.733+X | (1+) | 179.94 2 | (M1) | 5.46 | α=5.46 8, α(K)=4.30 6, α(L)=0.872 12, α(M)=0.2127 30, α(N)=0.0581 8, α(O)=0.01464 20, α(P)=0.00280 4, α(Q)=0.0001780 25 | |
| (1+) | 223.75 2 | (E1) | 0.0811 | α=0.0811 11, α(K)=0.0633 9, α(L)=0.01346 19, α(M)=0.00329 5, α(N)=0.000891 12, α(O)=0.0002191 31, α(P)=3.90×10-5 5, α(Q)=1.837E-6 26 |
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 Nilsson single-particle states: 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 change transition, therefore proton configuration=(π 5/2[642]) is preferred. According to the Gallagher-Moszkowski rules for coupling of the two odd nucleons; spin parallel state (7-) should be the lowest state and the spin-antiparallel (2-) is the isomeric state. |
| 0.0+X | (2-) | 25.0 m 2 % IT = ? % β- = 100 | Jπ(level): From Nilsson single-particle states: 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 change transition, therefore proton configuration=(π 5/2[642]) is preferred. According to the Gallagher-Moszkowski rules for coupling of the two odd nucleons; spin parallel state (7-) should be the lowest state and the spin-antiparallel (2-) is the isomeric state. |
| 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). |
Theoretical structure calculations:
Q(α), T1/2(α), T1/2(SF):
2020Ja01,2019Sr04,2005Re16,1983Bo15
Fission:
2020Ja01
Compilation of long lived isomer:
2011He12,1987So10
Compilation of β-decay
2009So02, 1992So06
Bandhead energies Rotational structure configurations:
1984So03
Rotational structure configurations:
1994So16
Q-value: ΔQ(β-)=18, ΔS(n)=18, ΔS(p)=22, ΔQ(α)=200 (syst,2021Wa16)
Q-value: S(2n)=11028 18, S(2p)=12820 100 (syst,2021Wa16)