ADOPTED LEVELS, GAMMAS for 149La
Authors: Balraj Singh and Jun Chen | Citation: Nucl. Data Sheets 185, 2 (2022) | Cutoff date: 23-Aug-2022
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=6.45×103 keV 20 | S(n)= 5.58×103 keV 20 | S(p)= 9.96×103 keV 20 | Q(α)= -2.59×103 keV 20 | ||
Reference: 2021WA16 |
References: | |||
A | 149Ba β- decay (352 MS) | B | 248Cm SF decay |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | AB | (3/2) | 1.091 s 34 % β- = 100 % β-n = 1.41 34 | |||||
0+X | B | (7/2-) | ||||||
45.97 8 | A | (1/2,3/2,5/2) | 46.0 1 | 100 | M1+E2 | 0.0 | (3/2) | |
81.5+X 3 | B | (11/2-) | 81.5 | | (E2) | 0+X | (7/2-) | |
83.00 10 | A | 83.0 1 | 100 | 0.0 | (3/2) | |||
164.50 18 | A | 81.5 2 | 100 | M1,E2 | 83.00 | |||
226.03 8 | A | 180.1 1 226.0 1 | 100 5 87 6 | 45.97 0.0 | (1/2,3/2,5/2) (3/2) | |||
280.8+X 5 | B | (15/2-) | 199.3 | | (Q) | 81.5+X | (11/2-) | |
286.30 17 | A | 121.8 2 286.3 2 | 16 4 100 24 | 164.50 0.0 | (3/2) | |||
357.32 15 | A | 131.3 2 357.3 2 | 27 5 100 16 | 226.03 0.0 | (3/2) | |||
505.7 3 | A | 219.4 2 | 100 | 286.30 | ||||
516.53 22 | A | 290.5 2 | 100 | 226.03 | ||||
598.3+X 6 | B | (19/2-) | 317.5 | | (Q) | 280.8+X | (15/2-) | |
843.6 5 | A | 617.6 5 | 100 | 226.03 | ||||
893.9 3 | A | 607.6 2 | 100 | 286.30 | ||||
1016.5+X 6 | B | (23/2-) | 418.2 | | (Q) | 598.3+X | (19/2-) | |
1510.3+X 7 | B | (27/2-) | 493.8 | | (Q) | 1016.5+X | (23/2-) | |
2051.1+X 8 | B | (31/2-) | 540.8 | | (Q) | 1510.3+X | (27/2-) | |
2606.7+X 8 | B | (35/2-) | 555.6 | | 2051.1+X | (31/2-) |
E(level): From a least-squares fit to Eγ values, assuming an uncertainty of 0.3 keV if not available
Jπ(level): ΔJ=2 high-spin band based on (7/2-) in 248Cm SF decay, also supported by a cascade of quadrupole transitions (most likely E2) from γγ(θ) data.
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - Probable π3/2[541],α=-1/2 | |||||||
0+X | (7/2-) | ||||||
81.5+X 3 | (11/2-) | ||||||
280.8+X 5 | (15/2-) | 199.3 | | (Q) | 81.5+X | (11/2-) | |
598.3+X 6 | (19/2-) | 317.5 | | (Q) | 280.8+X | (15/2-) | |
1016.5+X 6 | (23/2-) | 418.2 | | (Q) | 598.3+X | (19/2-) | |
1510.3+X 7 | (27/2-) | 493.8 | | (Q) | 1016.5+X | (23/2-) | |
2051.1+X 8 | (31/2-) | 540.8 | | (Q) | 1510.3+X | (27/2-) | |
2606.7+X 8 | (35/2-) | 555.6 | | 2051.1+X | (31/2-) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
45.97 | (1/2,3/2,5/2) | 46.0 1 | M1+E2 | 23 | α=23 13 | |
81.5+X | (11/2-) | 81.5 | (E2) | 4.15 | α=4.15 6 | |
164.50 | 81.5 2 | M1,E2 | 3.0 | α=3.0 11 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | (3/2) | 1.091 s 34 % β- = 100 % β-n = 1.41 34 | XREF: B(?). |
0+X | (7/2-) | E(level): Probable π3/2[541],α=-1/2. | |
81.5+X | (11/2-) | E(level): Probable π3/2[541],α=-1/2. | |
280.8+X | (15/2-) | E(level): Probable π3/2[541],α=-1/2. | |
598.3+X | (19/2-) | E(level): Probable π3/2[541],α=-1/2. | |
1016.5+X | (23/2-) | E(level): Probable π3/2[541],α=-1/2. | |
1510.3+X | (27/2-) | E(level): Probable π3/2[541],α=-1/2. | |
2051.1+X | (31/2-) | E(level): Probable π3/2[541],α=-1/2. | |
2606.7+X | (35/2-) | E(level): Probable π3/2[541],α=-1/2. |
E(level) | E(gamma) | Comments |
45.97 | 46.0 | M(γ): From conversion coefficients deduced based on I(γ+ce) intensity balance in 149Ba β- decay (2004Sy01) |
81.5+X | 81.5 | M(γ): from ce data in 248Cm SF decay |
164.50 | 81.5 | M(γ): From conversion coefficients deduced based on I(γ+ce) intensity balance in 149Ba β- decay (2004Sy01) |
280.8+X | 199.3 | M(γ): From γγ(θ) in 248Cm SF decay. Mult=(Q) corresponds to ΔJ=2 transition, most likely E2. |
598.3+X | 317.5 | M(γ): From γγ(θ) in 248Cm SF decay. Mult=(Q) corresponds to ΔJ=2 transition, most likely E2. |
1016.5+X | 418.2 | M(γ): From γγ(θ) in 248Cm SF decay. Mult=(Q) corresponds to ΔJ=2 transition, most likely E2. |
1510.3+X | 493.8 | M(γ): From γγ(θ) in 248Cm SF decay. Mult=(Q) corresponds to ΔJ=2 transition, most likely E2. |
2051.1+X | 540.8 | M(γ): From γγ(θ) in 248Cm SF decay. Mult=(Q) corresponds to ΔJ=2 transition, most likely E2. |
149La isotope produced through mass separation of fission fragments from 235U(n,F) E(n)=thermal (1979En02,1986ReZU,2002Sy01,2004Sy01). See also 2017Wu04, with isotope production in 9Be(238U,F) reaction, followed by half-life measurement of 149La decay.
Mass measurement using Penning-trap method: 2003SaZU
Theoretical studies: consult the NSR database at www.nndc.bnl.gov/nsr/ for one references dealing with radioactive decay, listed under ’document record’ which can be accessed through web retrieval of the ENSDF database at www.nndc.bnl.gov/ensdf/
Q-value: S(2n)=9680 200, S(2p)=22880 200, Q(β-n)=2110 200 (2021Wa16)