ADOPTED LEVELS for 243Bk
Authors: C.D. Nesaraja, E.A. Mccutchan | Citation: Nucl. Data Sheets 121, 695 (2014) | Cutoff date: 30-Sep-2013
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-2300 keV SY | S(n)= 7115 keV SY | S(p)= 3403 keV 4 | Q(α)= 6874 keV 4 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 247Es α decay (4.55 M) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0.0 | (3/2-) | 4.6 h 2 % ε ≈ 99.85 % α ≈ 0.15 | |
| ≈18 | A | (7/2+) | |
| 67 20 | A | (9/2+) | |
| 131 20 | A | (11/2+) | |
| ≈2200 | 5 ns % SF ≤ 100 |
| E(level) (keV) | Jπ(level) | T1/2(level) | |||||
| Band 1 - 7/2[633] band. α=5.7 FOR B=0.0. | |||||||
| ≈18 | (7/2+) | ||||||
| 67 20 | (9/2+) | ||||||
| 131 20 | (11/2+) | ||||||
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (3/2-) | 4.6 h 2 % ε ≈ 99.85 % α ≈ 0.15 | Partial half-life for spontaneous-fission decay calculated by 1985Lo17 and 1978Po09: log[T1/2(SF in years)]≈3.6 and ≈5.0 from plots in 1985Lo17 and 1978Po09, respectively, yield spontaneous fission branchings≈1.3×10-5% and ≈5.1×10-7%. E(level): Partial half-life for spontaneous-fission decay calculated by 1985Lo17 and 1978Po09: log[T1/2(SF in years)]≈3.6 and ≈5.0 from plots in 1985Lo17 and 1978Po09, respectively, yield spontaneous fission branchings≈1.3×10-5% and ≈5.1×10-7%. |
| 18 | (7/2+) | E(level): 7/2[633] band. α=5.7 FOR B=0.0. Jπ(level): Hindrance factors for α decay from (7/2+) 247Es and the level spacings imply that these levels are probably members of a rotational band. From the unhindered character of the α transition (HF≈2.4) to the ≈18 keV level, the bandhead member should be the same state as that of the parent. Systematics of Nilsson states (see, for example, 1972El21) suggest either the 3/2[521] or the 7/2[633] orbital for 247Es g.s. If the α decay was to the 3/2[521] orbital, the band parameter would be 9.4 which would not fit the local trend. By assuming a rotational band built on the 7/2[633] state, the rotational band parameter of 5.7 is consistent with band parameters for 7/2[633] bands in the region. | |
| 67 | (9/2+) | E(level): 7/2[633] band. α=5.7 FOR B=0.0. Jπ(level): Hindrance factors for α decay from (7/2+) 247Es and the level spacings imply that these levels are probably members of a rotational band. From the unhindered character of the α transition (HF≈2.4) to the ≈18 keV level, the bandhead member should be the same state as that of the parent. Systematics of Nilsson states (see, for example, 1972El21) suggest either the 3/2[521] or the 7/2[633] orbital for 247Es g.s. If the α decay was to the 3/2[521] orbital, the band parameter would be 9.4 which would not fit the local trend. By assuming a rotational band built on the 7/2[633] state, the rotational band parameter of 5.7 is consistent with band parameters for 7/2[633] bands in the region. | |
| 131 | (11/2+) | E(level): 7/2[633] band. α=5.7 FOR B=0.0. Jπ(level): Hindrance factors for α decay from (7/2+) 247Es and the level spacings imply that these levels are probably members of a rotational band. From the unhindered character of the α transition (HF≈2.4) to the ≈18 keV level, the bandhead member should be the same state as that of the parent. Systematics of Nilsson states (see, for example, 1972El21) suggest either the 3/2[521] or the 7/2[633] orbital for 247Es g.s. If the α decay was to the 3/2[521] orbital, the band parameter would be 9.4 which would not fit the local trend. By assuming a rotational band built on the 7/2[633] state, the rotational band parameter of 5.7 is consistent with band parameters for 7/2[633] bands in the region. | |
| 2200 | 5 ns % SF ≤ 100 | Assignment: 241Am(α,2n) systematics (1972Ga42). E(level): Assignment: 241Am(α,2n) systematics (1972Ga42). |
S(2n)=13485 syst 200; S(2p)=8823 4 (2012Wa38)
First identification: 1950Th52 in α particle bombardment of Americium, chemical separation.
Theoretical calculations:
2013Zd01: T1/2 for α decay calculated with a phenomenological model based on Gamow theory with WKB approximation for Coulomb barrier penetration.
2012Ni16: α decay T1/2 and fine structure calculated with Multichannel cluster model
2012Po01: calculated α decay T1/2 with a universal decay law using α-like R matrix theory.
2012Sa05,2011Sa40: calculated T1/2 and α decay fine structure using Coulomb and proximity potential model.
2012Zh01: β2, β4, moment of inertia, and alignments calculated with a particle conserving method based on the cranked shell model.
2011Zh36: partial α decay T1/2 to members of favored band calculated with a microscopic quantum tunneling theory.
2010Ni02: T1/2 and branching ratios calculated using generalized density dependent cluster model.
2008Do12: calculated binding energies with additional terms beyond standard Bethe Weizsacker formula
2004Pa40: deformation parameters, pairing gap, and single particle energy levels calculated with a macroscopic-microscopic model.
2002Lo05: calculated binding energies, Q(α), pairing gap, ground state deformation and single-particle levels with a relativistic mean field approach.
1985Lo17,1978Po09: calculated spontaneous-fission half-life of ground state.
1984Ku05: systematic study of fission-barrier parameters
1980Ka41: hindrance factors for α’s from 243Bk were calculated with R-matrix method.
Q-value: ΔQ(β-)=114; ΔS(n)=200 (2012Wa38)