ADOPTED LEVELS, GAMMAS for 50K
Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 157, 1 (2019) | Cutoff date: 15-Apr-2019
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=13861 keV 8 | S(n)= 4188 keV 8 | S(p)= 15830 keV SY | Q(α)= -14.29×103 keV 21 | ||
| Reference: 2017Wa10 |
| References: | |||
| A | 50Ar β- decay (106 MS) | B | 50K IT decay (131 NS) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | AB | 0(-) | 472 ms 4 % β- = 100 % β-n = 29 3 % β-2n = ? | |||||
| 44.0 6 ? | B | (1,2-) | 44 1 | | 0.0 | 0(-) | ||
| 70.2 7 ? | B | (1,2-) | 70 1 | | 0.0 | 0(-) | ||
| 172.0 4 | B | (2-) | 131 ns 40 | 101 1 128.1 5 172.0 5 | 82 22 100 25 | (E2) (E2) | 70.2 44.0 0.0 | (1,2-) (1,2-) 0(-) |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Additional Data |
| 172.0 | (2-) | 131 ns 40 | 128.1 5 | (E2) | B(E2)(W.u.)=3.4 15 |
| (2-) | 131 ns 40 | 172.0 5 | (E2) | B(E2)(W.u.)=1.4 6 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0(-) | 472 ms 4 % β- = 100 % β-n = 29 3 % β-2n = ? | Dominant configuration=π1d3/2-1~#ν2p3/2-1 (2014Pa45) from shell-model calculations. See also 1998Ba80 and 1991Wa23. |
| E(level) | E(gamma) | Comments |
| 44.0 | 44 | E(γ): Ordering of the 127-44 and 101-70 γ cascades can be reversed as in 2009Cr03 for the 127-44 cascade |
| 70.2 | 70 | E(γ): Ordering of the 127-44 and 101-70 γ cascades can be reversed as in 2009Cr03 for the 127-44 cascade |
| 172.0 | 101 | E(γ): Ordering of the 127-44 and 101-70 γ cascades can be reversed as in 2009Cr03 for the 127-44 cascade | 128.1 | E(γ): Ordering of the 127-44 and 101-70 γ cascades can be reversed as in 2009Cr03 for the 127-44 cascade M(γ): E2 suggested by 1999DaZQ, in contrast to M1 or E1, based on Weisskopf estimates for E2, M1 and E1 transitions. | 172.0 | M(γ): E2 suggested by 1999DaZQ, in contrast to M1 or E1, based on Weisskopf estimates for E2, M1 and E1 transitions. |
1983RaZR,1982Ca04: U(p,X),E=600 MeV. Measured neutron and γ spectra, nγ-coincidences.
1983La23: U(p,X) E=600 MeV. Measured β-n coincidences using scintillation detectors
1986Mi08: U(p,X) E=600 MeV. See 50K β- decay for details
1990Tu01: 232Th(p,X), LAMPF. Measured fragment charge, mass spectra.
Mass measurement: 2012La05
Other: 1978De17.
Theory references: consult the NSR database (www.nndc.bnl.gov/nsr/) for seven references for structure calculations.
Q-value: Δ(S(p))=400 (syst, 2017Wa10)
Q-value: Q(β-n)=7501 8, S(2n)=9586 8, S(2p)=36030 500(syst) (2017Wa10)