ADOPTED LEVELS, GAMMAS for 221Th
Authors: Ashok Jain, Sukhjeet Singh, Suresh Kumar, Jagdish Tuli | Citation: Nucl. Data Sheets 108, 883 (2007) | Cutoff date: 15-Jan-2007
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-3.44×103 keV 6 | S(n)= 5802 keV 24 | S(p)= 4095 keV 11 | Q(α)= 8626 keV 4 | ||
Reference: 2012WA38 |
References: | |||
A | 225U α decay | B | 208Pb(16O,3nγ) E=78-89 MeV |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | AB | (7/2+) | 1.74 ms 3 % α = 100 | |||||
47 20 ? | A | |||||||
250.9 3 | AB | (11/2+) | 250.9 3 | 100.0 | E2 | 0.0 | (7/2+) | |
488.0 5 | B | (13/2-) | 237.1 3 | 100.0 | E1 | 250.9 | (11/2+) | |
572.8 5 | B | (15/2+) | 84.8 3 321.9 3 | 58 7 100 5 | E1 E2 | 488.0 250.9 | (13/2-) (11/2+) | |
746.9 6 | B | (17/2-) | 174.1 3 258.9 3 ? | 100 4 7.3 11 | E1 [E2] | 572.8 488.0 | (15/2+) (13/2-) | |
946.5 6 | B | (19/2+) | 199.6 3 373.6 5 | 100 6 27 9 | E1 E2 | 746.9 572.8 | (17/2-) (15/2+) | |
1078.6 7 | B | (21/2-) | 132.1 3 332.1 3 | 100 3 36 6 | E1 [E2] | 946.5 746.9 | (19/2+) (17/2-) | |
1356.0 8 | B | (23/2+) | 277.4 3 409.5 3 ? | 100 6 9 4 | E1 [E2] | 1078.6 946.5 | (21/2-) (19/2+) | |
1472.0 9 | B | (25/2-) | 116.0 3 393.3 3 | 100 7 87 7 | E1 E2 | 1356.0 1078.6 | (23/2+) (21/2-) | |
1776.4 9 | B | (27/2+) | 304.4 3 420.3 10 ? | 100 9 <13.64 | E1 [E2] | 1472.0 1356.0 | (25/2-) (23/2+) | |
1935.4 10 | B | (29/2-) | 159.0 3 463.5 5 | 93 15 100 15 | E1 E2 | 1776.4 1472.0 | (27/2+) (25/2-) | |
2251.5 11 | B | (31/2+) | 316.1 3 475.0 11 ? | 100 17 <16.67 | E1 [E2] | 1935.4 1776.4 | (29/2-) (27/2+) | |
2421.5 11 | B | (33/2-) | 170.4 3 485.7 3 | 26 4 100 12 | [E1] [E2] | 2251.5 1935.4 | (31/2+) (29/2-) |
E(level): 1988Da15 suggested that the 250.9-keV transition, the strongest γ seen in 208Pb(16O,3nγ) reaction, depopulates either a 250.9-keV or possibly a 250.9+x keV level; x was estimated to be less than 50 keV from the experimental limit for observations of low-energy transitions. Therefore, as pointed out by 1988Da15, all excited-state energies might be higher by an amount of E|<50 keV.
Jπ(level): Spins and parities of all excited states were deduced by 1988Da15 from multipolarities of deexciting γ transitions observed in 208Pb(16O,3nγ). If the 250.9γ feeds a low-lying level at E|<50 keV with a spin and parity different from 7/2+, then Jπ’s given here for all excited states would have to be changed by [Jπ(level populated by 250.9γ)-7/2+].
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - K=1/2 GS band (1988Le13). | |||||||
0.0 | (7/2+) | 1.74 ms 3 % α = 100 | |||||
250.9 3 | (11/2+) | ||||||
572.8 5 | (15/2+) | 84.8 3 321.9 3 | 58 7 100 5 | E1 E2 | 488.0 250.9 | (13/2-) (11/2+) | |
946.5 6 | (19/2+) | 199.6 3 373.6 5 | 100 6 27 9 | E1 E2 | 746.9 572.8 | (17/2-) (15/2+) | |
1356.0 8 | (23/2+) | 277.4 3 409.5 3 ? | 100 6 9 4 | E1 [E2] | 1078.6 946.5 | (21/2-) (19/2+) | |
1776.4 9 | (27/2+) | 304.4 3 420.3 10 ? | 100 9 <13.64 | E1 [E2] | 1472.0 1356.0 | (25/2-) (23/2+) | |
2251.5 11 | (31/2+) | 316.1 3 475.0 11 ? | 100 17 <16.67 | E1 [E2] | 1935.4 1776.4 | (29/2-) (27/2+) | |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - K=1/2 parity doublet of GS band (1988Le13). | |||||||
488.0 5 | (13/2-) | ||||||
746.9 6 | (17/2-) | ||||||
1078.6 7 | (21/2-) | 132.1 3 332.1 3 | 100 3 36 6 | E1 [E2] | 946.5 746.9 | (19/2+) (17/2-) | |
1472.0 9 | (25/2-) | 116.0 3 393.3 3 | 100 7 87 7 | E1 E2 | 1356.0 1078.6 | (23/2+) (21/2-) | |
1935.4 10 | (29/2-) | 159.0 3 463.5 5 | 93 15 100 15 | E1 E2 | 1776.4 1472.0 | (27/2+) (25/2-) | |
2421.5 11 | (33/2-) | 170.4 3 485.7 3 | 26 4 100 12 | [E1] [E2] | 2251.5 1935.4 | (31/2+) (29/2-) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
250.9 | (11/2+) | 250.9 3 | E2 | 0.304 | α=0.304 | |
488.0 | (13/2-) | 237.1 3 | E1 | 0.0640 | α=0.0640 | |
572.8 | (15/2+) | 84.8 3 | E1 | 0.184 | α=0.184 | |
(15/2+) | 321.9 3 | E2 | 0.139 | α=0.139 | ||
746.9 | (17/2-) | 174.1 3 | E1 | 0.132 | α=0.132 | |
(17/2-) | 258.9 3 | [E2] | 0.274 | α=0.274 | ||
946.5 | (19/2+) | 199.6 3 | E1 | 0.0957 | α=0.0957 | |
(19/2+) | 373.6 5 | E2 | 0.0911 | α=0.0911 | ||
1078.6 | (21/2-) | 132.1 3 | E1 | 0.257 | α=0.257 | |
(21/2-) | 332.1 3 | [E2] | 0.127 | α=0.127 | ||
1356.0 | (23/2+) | 277.4 3 | E1 | 0.0447 | α=0.0447 | |
(23/2+) | 409.5 3 | [E2] | 0.0713 | α=0.0713 | ||
1472.0 | (25/2-) | 116.0 3 | E1 | 0.352 | α=0.352 | |
(25/2-) | 393.3 3 | E2 | 0.0793 | α=0.0793 | ||
1776.4 | (27/2+) | 304.4 3 | E1 | 0.0363 | α=0.0363 | |
(27/2+) | 420.3 10 | [E2] | 0.0666 | α=0.0666 | ||
1935.4 | (29/2-) | 159.0 3 | E1 | 0.165 | α=0.165 | |
(29/2-) | 463.5 5 | E2 | 0.0521 | α=0.0521 | ||
2251.5 | (31/2+) | 316.1 3 | E1 | 0.0334 | α=0.0334 | |
(31/2+) | 475.0 11 | [E2] | 0.0491 | α=0.0491 | ||
2421.5 | (33/2-) | 170.4 3 | [E1] | 0.1396 | α=0.1396 | |
(33/2-) | 485.7 3 | [E2] | 0.0465 | α=0.0465 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | (7/2+) | 1.74 ms 3 % α = 100 | See 1985Po14 for calculated half-lives for decays by multiple heavy-ion emission; see 1973Ta30 for calculated T1/2(ε decay). E(level): See 1985Po14 for calculated half-lives for decays by multiple heavy-ion emission; see 1973Ta30 for calculated T1/2(ε decay). K=1/2 GS band (1988Le13). |
250.9 | (11/2+) | E(level): K=1/2 GS band (1988Le13). | |
488.0 | (13/2-) | E(level): K=1/2 parity doublet of GS band (1988Le13). | |
572.8 | (15/2+) | E(level): K=1/2 GS band (1988Le13). | |
746.9 | (17/2-) | E(level): K=1/2 parity doublet of GS band (1988Le13). | |
946.5 | (19/2+) | E(level): K=1/2 GS band (1988Le13). | |
1078.6 | (21/2-) | E(level): K=1/2 parity doublet of GS band (1988Le13). | |
1356.0 | (23/2+) | E(level): K=1/2 GS band (1988Le13). | |
1472.0 | (25/2-) | E(level): K=1/2 parity doublet of GS band (1988Le13). | |
1776.4 | (27/2+) | E(level): K=1/2 GS band (1988Le13). | |
1935.4 | (29/2-) | E(level): K=1/2 parity doublet of GS band (1988Le13). | |
2251.5 | (31/2+) | E(level): K=1/2 GS band (1988Le13). | |
2421.5 | (33/2-) | E(level): K=1/2 parity doublet of GS band (1988Le13). |
Assignment: parent of 217Ra, 213Rn (1970To07 and 1970Va13); 208Pb(16O,3n) excit (1970To07 and 1970Va13); cross bombardments (1970Va13).
See 1989De11 for calculations of B(E1)/B(E2) values.
Levels: See 1988Le13 for theoretical interpretation of levels, and level energy calculations by coupling states of a deformed shell model to a reflection-asymmetric rotor core. The single-particle states were obtained from a Woods-Saxon potential, including octupole deformation (octupole deformation of 0.1) as well as quadrupole deformation.
Levels: See 1991Cw01 also for deformation,level energy calculations based on the fit to the suggested parity doublet ground band. α review of the reflection asymmetric shapes may be found in 1996Bu45.
Levels: Higher-order deformations up to β7 were included by 1989Cw03 in calculations of non-collective quasiparticle state energies for odd-A thorium isotopes in the transitional region. These higher-order equilibrium deformations lead to further fragmentation of single-particle orbitals. For K=1/2 bandhead (at g.s.), β2=0.101, β3=0.090, β4=0.065, β5=0.042, β6=0.020 and β7=0.027 were obtained. See 1989Cw03 for calculated deformations and energies for the K=3/2 and 5/2 bandheads.
Q-value: Note: Current evaluation has used the following Q record -3440 50 5802 24 4103 17 8626 4 2003Au03