ADOPTED LEVELS, GAMMAS for 253Fm
Authors: E. Browne, J. K. Tuli | Citation: Nucl. Data Sheets 114, 1041 (2013) | Cutoff date: 1-Mar-2012
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-1826 keV SY | S(n)= 5540 keV 6 | S(p)= 5235 keV 50 | Q(α)= 7198 keV 3 | ||
Reference: 2012WA38 |
References: | |||
A | 257No α decay | B | 253Md ε decay |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | AB | 1/2+ | 3.00 d 12 % ε = 88 1 % α = 12 1 | |||||
22.3 1 | AB | (3/2+) | 22.3? | | 0.0 | 1/2+ | ||
47.1 2 | AB | (5/2+) | 24.8? 47.1? | | 22.3 0.0 | (3/2+) 1/2+ | ||
124.1 1 | AB | 3/2+ | 77.0 2 101.8 1 124.1 1 | 100 8 57 13 78 28 | M1 (M1) M1 | 47.1 22.3 0.0 | (5/2+) (3/2+) 1/2+ | |
X | B | 7/2+ | ||||||
158.7 2 | AB | (5/2+) | 136.4 2 | 100 | (M1) | 22.3 | (3/2+) | |
60+X | B | 9/2+ | ||||||
135+X | B | 11/2+ | ||||||
211+X | B | 11/2- | 0.56 µs 6 | 76.8 150.5 5 | | (E1) (E1) | 135+X 60+X | 11/2+ 9/2+ |
398+X | B | 9/2+ | 188.0 5 338.2 5 398.2? | | (E1) | 211+X 60+X X | 11/2- 9/2+ 7/2+ |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - Band 1/2+[620] | |||||||
0.0 | 1/2+ | 3.00 d 12 % ε = 88 1 % α = 12 1 | |||||
22.3 1 | (3/2+) | 22.3? | | 0.0 | 1/2+ | ||
47.1 2 | (5/2+) | 24.8? 47.1? | | 22.3 0.0 | (3/2+) 1/2+ | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - Band 3/2+[622] (tentative) | |||||||
124.1 1 | 3/2+ | ||||||
158.7 2 | (5/2+) | 136.4 2 | 100 | (M1) | 22.3 | (3/2+) | |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 3 - 7/2+[613] | |||||||
X | 7/2+ | ||||||
60+X | 9/2+ | ||||||
135+X | 11/2+ |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
124.1 | 3/2+ | 77.0 2 | M1 | 22.4 | α=22.4, α(L)=16.8 3, α(M)=4.15 7, α(N)=1.159 19, α(O)=0.306 5, α(P)=0.0595 10, α(Q)=0.00335 6, α(N+)=1.528 25 | |
3/2+ | 101.8 1 | (M1) | 9.97 | α=9.97, α(L)=7.45 11, α(M)=1.84 3, α(N)=0.514 8, α(O)=0.1360 20, α(P)=0.0264 4, α(Q)=0.001484 22, α(N+)=0.678 10 | ||
3/2+ | 124.1 1 | M1 | 5.63 | α=5.63, α(L)=4.20 6, α(M)=1.039 15, α(N)=0.290 5, α(O)=0.0767 11, α(P)=0.01488 22, α(Q)=0.000836 12, α(N+)=0.383 6 | ||
158.7 | (5/2+) | 136.4 2 | (M1) | 4.29 | α=4.29, α(L)=3.20 5, α(M)=0.792 12, α(N)=0.221 4, α(O)=0.0584 9, α(P)=0.01134 17, α(Q)=0.000636 10, α(N+)=0.292 5 | |
211+X | 11/2- | 0.56 µs 6 | 76.8 | (E1) | 0.307 | α=0.307, α(L)=0.229 4, α(M)=0.0576 8, α(N)=0.01592 23, α(O)=0.00400 6, α(P)=0.000638 9, α(Q)=1.84×10-5 3, α(N+)=0.0206 3 |
11/2- | 0.56 µs 6 | 150.5 5 | (E1) | 0.215 | α=0.215 4, α(K)=0.1596 25, α(L)=0.0417 7, α(M)=0.01037 17, α(N)=0.00287 5, α(O)=0.000735 12, α(P)=0.0001268 21, α(Q)=4.55×10-6 8, α(N+)=0.00374 6 | |
398+X | 9/2+ | 188.0 5 | (E1) | 0.1317 | α=0.1317 20, α(K)=0.0994 15, α(L)=0.0242 4, α(M)=0.00600 10, α(N)=0.00166 3, α(O)=0.000427 7, α(P)=7.51×10-5 12, α(Q)=2.87E-6 5, α(N+)=0.00217 4 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | 1/2+ | 3.00 d 12 % ε = 88 1 % α = 12 1 | E(level): Band 1/2+[620]. |
22.3 | (3/2+) | XREF: B(?). E(level): Band 1/2+[620]. | |
47.1 | (5/2+) | XREF: B(?). E(level): Band 1/2+[620]. | |
124.1 | 3/2+ | E(level): Band 3/2+[622] (tentative). | |
X | 7/2+ | E(level): 7/2+[613]. | |
158.7 | (5/2+) | XREF: B(?). E(level): Band 3/2+[622] (tentative). | |
60+X | 9/2+ | E(level): 7/2+[613]. | |
135+X | 11/2+ | E(level): 7/2+[613]. | |
398+X | 9/2+ | Configuration=ν9/2[615]. |
E(level) | E(gamma) | Comments |
211+X | 76.8 | M(γ): from estimated low conversion electron intensity | 150.5 | M(γ): α(K)exp<0.6 gives E1 or E2. E1 is preferred from intensity arguments. E3 is excluded from lifetime arguments |
398+X | 188.0 | M(γ): α(K)exp<0.87 gives E1 or E2. E1 is preferred from intensity arguments. E3 is excluded from lifetime arguments |
Calculations, compilations:
α decay: 1993Bu09, 1992Bu03
Binding energies: 1997Pa22
Deformation parameters: 1997Pa22, 2003Ga34
g.s. properties: 1997Mo25, 1995Mo29, 2005Pa73
Heavy ion emission: 1985Po11
2005Re16: Predicted SF half-life=6.1×103 y
Single-particle Nilsson levels: 1994Cw02, 2005Pa73
1994Cw02 have calculated the following single-particle level sequence: g.s., 1/2[620]; 0.11 MeV, 3/2[622]; 0.24 MeV, 7/2[613]; 0.33 MeV, 11/2[725]; 0.38 MeV, 9/2[734]; 0.75 MeV, 9/2[615]
2005Pa73 have calculated the following single-particle level sequence: g.s., 1/2[620]; 0.07 MeV, 3/2[622]; 0.25 MeV, 11/2[725]; 0.26 MeV, 7/2[613]; 0.39 MeV, 9/2[734]
Q-value: Estimated ΔQ(β-)=30 (2012Wa38)