ADOPTED LEVELS, GAMMAS for 252Cf
Authors: A.M. Mattera, S. Zhu, A.B. Hayes, E.A. Mccutchan | Citation: Nucl. Data Sheets 172, 543 (2021) | Cutoff date: 1-Jan-2021
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-1.26×103 keV 5 | S(n)= 6172 keV 4 | S(p)= 6482 keV 11 | Q(α)= 6216.95 keV 4 | ||
Reference: 2017WA10 |
References: | |||
A | 256Fm α decay | B | 252Es ε decay |
C | Coulomb Excitation | D | CF(18O,xγ) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | ABCD | 0+ | 2.647 y 3 % α = 96.898 3 % SF = 3.102 3 | |||||
45.72 5 | ABCD | 2+ | 92 ps 6 | 45.72 5 | 100 | E2 | 0.0 | 0+ |
151.73 6 | B D | 4+ | 106.02 5 | 100 | E2 | 45.72 | 2+ | |
316.23 12 | D | 6+ | 164.5 1 | 100 | E2 | 151.73 | 4+ | |
536.6 3 | D | 8+ | 220.4 3 | 100 | E2 | 316.23 | 6+ | |
804.82 7 | B | (2+) | 759.1 1 804.8 1 | 100 8 77 5 | [E2] [E2] | 45.72 0.0 | 2+ 0+ | |
809.2 6 | D | 10+ | 272.6 5 | 100 | E2 | 536.6 | 8+ | |
830.81 7 | B | (2-) | 785.1 1 | 100 | [E1] | 45.72 | 2+ | |
845.72 9 | B | (3+) | 694.0 1 800.0 1 | 30.9 21 100 7 | 151.73 45.72 | 4+ 2+ | ||
867.52 7 | B | (3-) | 715.8 1 821.8 1 | 100 6 40 3 | [E1] [E1] | 151.73 45.72 | 4+ 2+ | |
900.33 25 | B | (4+) | 748.6 3 854.6 4 | 100 17 45 10 | [E2] [E2] | 151.73 45.72 | 4+ 2+ | |
917.03 12 | B | (4-) | 765.3 1 | 100 | [E1] | 151.73 | 4+ | |
969.83 6 | B | (3+) | 102.32 5 139.03 5 165.0 1 818.1 1 924.1 1 | 13.6 9 100 8 1.04 11 5.4 4 17.4 11 | [E1] E1 M1 | 867.52 830.81 804.82 151.73 45.72 | (3-) (2-) (2+) 4+ 2+ |
E(level): From a least-squares fit to Eγ, by evaluators.
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - Kπ=0+ g.s. band. | |||||||
0.0 | 0+ | 2.647 y 3 % α = 96.898 3 % SF = 3.102 3 | |||||
45.72 5 | 2+ | 92 ps 6 | 45.72 5 | 100 | E2 | 0.0 | 0+ |
151.73 6 | 4+ | 106.02 5 | 100 | E2 | 45.72 | 2+ | |
316.23 12 | 6+ | 164.5 1 | 100 | E2 | 151.73 | 4+ | |
536.6 3 | 8+ | 220.4 3 | 100 | E2 | 316.23 | 6+ | |
809.2 6 | 10+ | 272.6 5 | 100 | E2 | 536.6 | 8+ | |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - Kπ=2+ γ-vibrational band. Mixed with the K=3 state at | |||||||
804.82 7 | (2+) | ||||||
845.72 9 | (3+) | 694.0 1 800.0 1 | 30.9 21 100 7 | 151.73 45.72 | 4+ 2+ | ||
900.33 25 | (4+) | 748.6 3 854.6 4 | 100 17 45 10 | [E2] [E2] | 151.73 45.72 | 4+ 2+ | |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 3 - Kπ=2- band. | |||||||
830.81 7 | (2-) | ||||||
867.52 7 | (3-) | 715.8 1 821.8 1 | 100 6 40 3 | [E1] [E1] | 151.73 45.72 | 4+ 2+ | |
917.03 12 | (4-) | 765.3 1 | 100 | [E1] | 151.73 | 4+ |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
45.72 | 2+ | 92 ps 6 | 45.72 5 | E2 | 9.2×102 | B(E2)(W.u.)=349 24, α=9.2E2 5, α(L)=661 34, α(M)=188 10, α(N)=52.9 27, α(O)=13.1 7, α(P)=2.05 10, α(Q)=0.00469 21 |
151.73 | 4+ | 106.02 5 | E2 | 16.97 | α=16.97 25, α(L)=12.22 18, α(M)=3.49 5, α(N)=0.981 14, α(O)=0.243 4, α(P)=0.0389 6, α(Q)=0.0001510 22 | |
316.23 | 6+ | 164.5 1 | E2 | 2.49 | α=2.49 11, α(K)=0.1557 22, α(L)=1.68 8, α(M)=0.478 22, α(N)=0.134 6, α(O)=0.0334 15, α(P)=0.00543 25, α(Q)=3.29×10-5 11 | |
536.6 | 8+ | 220.4 3 | E2 | 0.791 | α=0.791 32, α(K)=0.1268 23, α(L)=0.480 22, α(M)=0.135 6, α(N)=0.0380 17, α(O)=0.0095 4, α(P)=0.00156 7, α(Q)=1.37×10-5 4 | |
804.82 | (2+) | 759.1 1 | [E2] | 0.0265 | α=0.0265 7, α(K)=0.0177 4, α(L)=0.00648 20, α(M)=0.00169 5, α(N)=0.000470 15, α(O)=0.000120 4, α(P)=2.17×10-5 7, α(Q)=7.86E-7 19 | |
(2+) | 804.8 1 | [E2] | 0.0236 | α=0.0236 6, α(K)=0.01606 35, α(L)=0.00555 17, α(M)=0.00144 4, α(N)=0.000400 12, α(O)=0.0001020 31, α(P)=1.86×10-5 6, α(Q)=7.01E-7 17 | ||
809.2 | 10+ | 272.6 5 | E2 | 0.373 | α=0.373 14, α(K)=0.0950 19, α(L)=0.202 9, α(M)=0.0564 24, α(N)=0.0158 7, α(O)=0.00395 17, α(P)=0.000661 28, α(Q)=7.69×10-6 23 | |
830.81 | (2-) | 785.1 1 | [E1] | 0.00719 | α=0.00719 16, α(K)=0.00577 13, α(L)=0.001066 25, α(M)=0.000257 6, α(N)=7.08×10-5 17, α(O)=1.82E-5 4, α(P)=3.45E-6 8, α(Q)=1.88E-7 4 | |
867.52 | (3-) | 715.8 1 | [E1] | 0.00847 | α=0.00847 19, α(K)=0.00678 15, α(L)=0.001265 30, α(M)=0.000306 7, α(N)=8.42×10-5 20, α(O)=2.17E-5 5, α(P)=4.08E-6 9, α(Q)=2.20E-7 5 | |
(3-) | 821.8 1 | [E1] | 0.00664 | α=0.00664 15, α(K)=0.00534 12, α(L)=0.000981 23, α(M)=0.000237 6, α(N)=6.51×10-5 15, α(O)=1.68E-5 4, α(P)=3.18E-6 7, α(Q)=1.75E-7 4 | ||
900.33 | (4+) | 748.6 3 | [E2] | 0.0273 | α=0.0273 7, α(K)=0.0181 4, α(L)=0.00673 21, α(M)=0.00176 6, α(N)=0.000489 15, α(O)=0.000124 4, α(P)=2.26×10-5 7, α(Q)=8.07E-7 20 | |
(4+) | 854.6 4 | [E2] | 0.0209 | α=0.0209 5, α(K)=0.01452 32, α(L)=0.00475 14, α(M)=0.00122 4, α(N)=0.000341 10, α(O)=8.69×10-5 26, α(P)=1.59E-5 5, α(Q)=6.24E-7 15 | ||
917.03 | (4-) | 765.3 1 | [E1] | 0.00752 | α=0.00752 17, α(K)=0.00604 14, α(L)=0.001118 26, α(M)=0.000270 6, α(N)=7.43×10-5 17, α(O)=1.91E-5 4, α(P)=3.61E-6 8, α(Q)=1.97E-7 4 | |
969.83 | (3+) | 102.32 5 | [E1] | 0.1394 | α=0.1394 20, α(L)=0.1043 15, α(M)=0.0260 4, α(N)=0.00711 10, α(O)=0.001772 25, α(P)=0.000296 4, α(Q)=1.004×10-5 14 | |
(3+) | 139.03 5 | E1 | 0.2502 | α=0.2502 35, α(K)=0.1862 26, α(L)=0.0479 7, α(M)=0.01186 17, α(N)=0.00326 5, α(O)=0.000817 12, α(P)=0.0001406 20, α(Q)=5.25×10-6 7 | ||
(3+) | 165.0 1 | M1 | 9.89 | α=9.89 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | 0+ | 2.647 y 3 % α = 96.898 3 % SF = 3.102 3 | %α and %SF from weighted average of deduced %SF values from α/SF=31.56 35 (1993Pa29), 31.5 3 (1970Al23), 31.3 5 (1970Al23), 31.3 2 (1965Me02), 31 1 (1954Ma98) and measured %SF value of 3.1028 27 (2018Be29). Other α/SF measurements: T1/2(SF)=66 y 10 (1957Ea01), α/SF=36.4 (1961Se18). E(level): %α and %SF from weighted average of deduced %SF values from α/SF=31.56 35 (1993Pa29), 31.5 3 (1970Al23), 31.3 5 (1970Al23), 31.3 2 (1965Me02), 31 1 (1954Ma98) and measured %SF value of 3.1028 27 (2018Be29). Other α/SF measurements: T1/2(SF)=66 y 10 (1957Ea01), α/SF=36.4 (1961Se18). Kπ=0+ g.s. band. |
45.72 | 2+ | 92 ps 6 | B(E2)=16.7 {I11} (1971Fo17) E(level): Kπ=0+ g.s. band. |
151.73 | 4+ | E(level): Kπ=0+ g.s. band. | |
316.23 | 6+ | E(level): Kπ=0+ g.s. band. | |
536.6 | 8+ | E(level): Kπ=0+ g.s. band. | |
804.82 | (2+) | E(level): Kπ=2+ γ-vibrational band. Mixed with the K=3 state at. | |
809.2 | 10+ | E(level): Kπ=0+ g.s. band. | |
830.81 | (2-) | E(level): Kπ=2- band. | |
845.72 | (3+) | E(level): Kπ=2+ γ-vibrational band. Mixed with the K=3 state at. | |
867.52 | (3-) | E(level): Kπ=2- band. | |
900.33 | (4+) | E(level): Kπ=2+ γ-vibrational band. Mixed with the K=3 state at. | |
917.03 | (4-) | E(level): Kπ=2- band. | |
969.83 | (3+) | the two-quasiparticle configuration of ν 1/2[620] + ν 7/2[613] was proposed by 1973Fi06. This assignment is consistent with its population in 252Es ε decay. E(level): the two-quasiparticle configuration of ν 1/2[620] + ν 7/2[613] was proposed by 1973Fi06. This assignment is consistent with its population in 252Es ε decay. |
E(level) | E(gamma) | Comments |
45.72 | 45.72 | E(γ): other: 44.0 keV 5 in Coulomb Excitation M(γ): from α(M)exp=240, α(N+O+...)=70 with uncertainties better than 15% in 252Es ε decay |
151.73 | 106.02 | M(γ): from α(L2)exp=7.2, α(L3)exp=3.8 with uncertainties better than 15% in 252Es ε decay |
316.23 | 164.5 | E(γ): from Cf(18O,Xγ) (2010Ta10). M(γ): Q from Iγ(in-plane)/Iγ(out-of-plane)=1.33 22 in Cf(18O,Xγ); E2 from assignment to rotational band |
536.6 | 220.4 | E(γ): from Cf(18O,Xγ) (2010Ta10). M(γ): Q from Iγ(in-plane)/Iγ(out-of-plane)=1.1 3 in Cf(18O,Xγ); E2 from assignment to rotational band |
809.2 | 272.6 | E(γ): from Cf(18O,Xγ) (2010Ta10). M(γ): Q from Iγ(in-plane)/Iγ(out-of-plane)=1.4 4 in Cf(18O,Xγ); E2 from assignment to rotational band |
969.83 | 139.03 | M(γ): from α(L1+L2)exp=0.03 with uncertainty better than 15% in 252Es ε decay |