ADOPTED LEVELS, GAMMAS for 149Ce
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-)=4369 keV 14 | S(n)= 4343 keV 15 | S(p)= 11250 keV 22 | Q(α)= -1579 keV 13 | ||
Reference: 2021WA16 |
References: | |||
A | 149La β- decay (1.091 S) | B | 150La β-n decay (0.51 S) |
C | 248Cm SF decay | D | 252Cf SF decay |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | ABCD | (3/2-) | 5.12 s 25 % β- = 100 | |||||
55.08 6 | A C | (5/2-) | 55.1 1 | 100 | M1(+E2) | 0.0 | (3/2-) | |
133.47 7 | A C | (3/2+) | 0.60 ns 10 | 78.4 1 133.5 1 | 9.3 14 100 3 | E1 [E1] | 55.08 0.0 | (5/2-) (3/2-) |
142.61 7 | A CD | (5/2+) | 9.1S 87.5 1 142.6 1 | 26 4 100 4 | E1 | 133.47 55.08 0.0 | (3/2+) (5/2-) (3/2-) | |
147.73 9 | A C | (7/2-) | 92.6 1 147.7 2 | 100 10 36 5 | E2(+M1) | 55.08 0.0 | (5/2-) (3/2-) | |
187.29 15 | A C | (3/2-,5/2,7/2-) | 132.2 3 187.2 2 | 43 6 100 6 | 55.08 0.0 | (5/2-) (3/2-) | ||
190.88 9 | A CD | (7/2+) | 48.3 2 57.4 3 135.8 1 | 10 3 24 6 100 12 | 142.61 133.47 55.08 | (5/2+) (3/2+) (5/2-) | ||
206.70 14 | CD | (9/2+) | 3.7 ns 5 | 15.8S 64.0 2 | 10 3 | 190.88 142.61 | (7/2+) (5/2+) | |
239.51 10 | C | (9/2-) | 91.7 2 184.5 1 | 44 6 100 9 | 147.73 55.08 | (7/2-) (5/2-) | ||
245.40 7 | A | (3/2-) | ≤ 0.12 ns | 102.8 1 112.0 2 190.3 2 245.4 1 | 11 3 36 3 28.8 24 100 19 | [E1] [E1] [M1+E2] [M1+E2] | 142.61 133.47 55.08 0.0 | (5/2+) (3/2+) (5/2-) (3/2-) |
288.97 11 | A C | (7/2-) | 101.5 3 141.3 3 233.9 1 | 43 14 100 12 33 5 | 187.29 147.73 55.08 | (3/2-,5/2,7/2-) (7/2-) (5/2-) | ||
305.52 11 | A | (5/2-) | 114.6 3 157.8 2 162.9 3 172.1 3 250.4 8 305.5 2 | 14.3 13 29 5 23 6 33 7 22 3 100 9 | 190.88 147.73 142.61 133.47 55.08 0.0 | (7/2+) (7/2-) (5/2+) (3/2+) (5/2-) (3/2-) | ||
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
335.76 12 | CD | (11/2+) | 96.3 3 129.0 1 144.9 1 | 15.0 22 78 11 100 11 | 239.51 206.70 190.88 | (9/2-) (9/2+) (7/2+) | ||
347.05 19 | CD | (13/2+) | 11.3S 140.5 2 | 100 5 | 335.76 206.70 | (11/2+) (9/2+) | ||
391.22 17 | A | (7/2-) | 200.3 2 248.5 4 336.3 3 | 81 19 69 19 100 25 | 190.88 142.61 55.08 | (7/2+) (5/2+) (5/2-) | ||
403.68 15 | C | (11/2-) | 164.2 2 255.8 2 | 44 6 100 11 | 239.51 147.73 | (9/2-) (7/2-) | ||
433.25 17 | A | 243.0 9 246.1 8 290.5 3 299.8 2 | 15 4 38 19 13 4 100 13 | 190.88 187.29 142.61 133.47 | (7/2+) (3/2-,5/2,7/2-) (5/2+) (3/2+) | |||
444.10 12 | A | 198.7 1 310.6 7 | 100 29 30 5 | 245.40 133.47 | (3/2-) (3/2+) | |||
459.76 17 | A | 154.2 2 214.5 5 317.2 3 404.6 5 | 69 42 25 8 42 12 100 15 | 305.52 245.40 142.61 55.08 | (5/2-) (3/2-) (5/2+) (5/2-) | |||
525.69 14 | C | (13/2-) | 121.9 2 286.2 1 | 17 4 100 8 | 403.68 239.51 | (11/2-) (9/2-) | ||
557.39 20 | A | 409.7 5 502.3 2 | 100 18 22 7 | 147.73 55.08 | (7/2-) (5/2-) | |||
575.2 4 | A | 520.1 4 | 100 | 55.08 | (5/2-) | |||
588.00 15 | CD | (15/2+) | 241.1 2 252.2 1 | 74 11 100 11 | 347.05 335.76 | (13/2+) (11/2+) | ||
588.45 22 | CD | (17/2+) | 241.4 1 | 100 | 347.05 | (13/2+) | ||
605.10 22 | A | 462.5 3 605.1 3 | 18 5 100 36 | 142.61 0.0 | (5/2+) (3/2-) | |||
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
615.4 3 | A | 481.9 3 560.3 10 | 100 17 56 17 | 133.47 55.08 | (3/2+) (5/2-) | |||
630.6 3 | A | 497.1 3 | 100 | 133.47 | (3/2+) | |||
638.9 3 | A | 393.5 3 | 100 | 245.40 | (3/2-) | |||
654.8 3 | A | 409.5 5 507.1 3 | 46 14 100 20 | 245.40 147.73 | (3/2-) (7/2-) | |||
661.7 7 | A | 519.1 7 | 100 | 142.61 | (5/2+) | |||
694.6 4 | A | 639.5 4 | 100 | 55.08 | (5/2-) | |||
752.18 18 | C | (15/2-) | 226.3 4 ? 348.5 1 | 12 6 100 6 | 525.69 403.68 | (13/2-) (11/2-) | ||
760.3 5 | A | 626.8 5 | 100 | 133.47 | (3/2+) | |||
826.1 5 | A | 638.4 8 692.8 6 | 71 36 100 21 | 187.29 133.47 | (3/2-,5/2,7/2-) (3/2+) | |||
896.79 17 | C | (17/2-) | 371.1 1 | 100 | 525.69 | (13/2-) | ||
931.65 24 | CD | (21/2+) | 343.2 1 | 100 | Q | 588.45 | (17/2+) | |
945.20 18 | CD | (19/2+) | 357.2 1 | 100 | 588.00 | (15/2+) | ||
1163.2 3 | C | (19/2-) | 411.0 2 | 100 | 752.18 | (15/2-) | ||
1329.0 3 | C | (21/2-) | 432.2 2 | 100 | 896.79 | (17/2-) | ||
1362.7 3 | CD | (25/2+) | 431.0 1 | 100 | Q | 931.65 | (21/2+) | |
1395.6 3 | CD | (23/2+) | 450.4 2 | 100 | 945.20 | (19/2+) | ||
1621.0 4 | C | (23/2-) | 457.8 3 | 100 | 1163.2 | (19/2-) | ||
1791.2 5 | A | 1648.5 10 1657.7 5 | 26 11 100 19 | 142.61 133.47 | (5/2+) (3/2+) | |||
1803.9 4 | C | (25/2-) | 474.9 2 | 100 | 1329.0 | (21/2-) | ||
1842.1 7 | A | 1700.0 13 1708.5 7 | 57 29 100 29 | 142.61 133.47 | (5/2+) (3/2+) | |||
1864.7 4 | CD | (29/2+) | 502.0 2 | 100 | 1362.7 | (25/2+) | ||
1868.9 10 | A | 1681.6 9 | 100 | 187.29 | (3/2-,5/2,7/2-) | |||
1923.5 4 | CD | (27/2+) | 527.9 2 | 100 | 1395.6 | (23/2+) | ||
2313.4 10 | C | (29/2-) | 509.5 9 | 100 | 1803.9 | (25/2-) | ||
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
2421.9 4 | CD | (33/2+) | 557.2 2 | 100 | 1864.7 | (29/2+) | ||
2510.5 5 | CD | (31/2+) | 587.0 3 | 100 | 1923.5 | (27/2+) | ||
3018.1 5 | CD | (37/2+) | 596.2 3 | 100 | 2421.9 | (33/2+) | ||
3141.8 7 ? | D | (35/2+) | 631.3? | 100 | 2510.5 | (31/2+) | ||
3635.6 7 ? | D | (41/2+) | 617.5? | 100 | 3018.1 | (37/2+) |
E(level): From least-squares fit to Eγ data, assuming ΔEγ=0.5 keV, when not stated
Jπ(level): From probable band structures for levels of Jπ=7/2+ and higher, assuming (3/2+) and (5/2+) for bandheads. Exceptions are noted.
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - ν3/2[532],α=+1/2 | |||||||
55.08 6 | (5/2-) | ||||||
239.51 10 | (9/2-) | 91.7 2 184.5 1 | 44 6 100 9 | 147.73 55.08 | (7/2-) (5/2-) | ||
525.69 14 | (13/2-) | 121.9 2 286.2 1 | 17 4 100 8 | 403.68 239.51 | (11/2-) (9/2-) | ||
896.79 17 | (17/2-) | 371.1 1 | 100 | 525.69 | (13/2-) | ||
1329.0 3 | (21/2-) | 432.2 2 | 100 | 896.79 | (17/2-) | ||
1803.9 4 | (25/2-) | 474.9 2 | 100 | 1329.0 | (21/2-) | ||
2313.4 10 | (29/2-) | 509.5 9 | 100 | 1803.9 | (25/2-) | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - ν3/2[532],α=-1/2 | |||||||
0.0 | (3/2-) | 5.12 s 25 % β- = 100 | |||||
147.73 9 | (7/2-) | 92.6 1 147.7 2 | 100 10 36 5 | E2(+M1) | 55.08 0.0 | (5/2-) (3/2-) | |
403.68 15 | (11/2-) | 164.2 2 255.8 2 | 44 6 100 11 | 239.51 147.73 | (9/2-) (7/2-) | ||
752.18 18 | (15/2-) | 226.3 4 ? 348.5 1 | 12 6 100 6 | 525.69 403.68 | (13/2-) (11/2-) | ||
1163.2 3 | (19/2-) | 411.0 2 | 100 | 752.18 | (15/2-) | ||
1621.0 4 | (23/2-) | 457.8 3 | 100 | 1163.2 | (19/2-) | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 3 - ν3/2[651],α=+1/2. | |||||||
142.61 7 | (5/2+) | ||||||
206.70 14 | (9/2+) | 3.7 ns 5 | 15.8S 64.0 2 | 10 3 | 190.88 142.61 | (7/2+) (5/2+) | |
347.05 19 | (13/2+) | 11.3S 140.5 2 | 100 5 | 335.76 206.70 | (11/2+) (9/2+) | ||
588.45 22 | (17/2+) | 241.4 1 | 100 | 347.05 | (13/2+) | ||
931.65 24 | (21/2+) | 343.2 1 | 100 | Q | 588.45 | (17/2+) | |
1362.7 3 | (25/2+) | 431.0 1 | 100 | Q | 931.65 | (21/2+) | |
1864.7 4 | (29/2+) | 502.0 2 | 100 | 1362.7 | (25/2+) | ||
2421.9 4 | (33/2+) | 557.2 2 | 100 | 1864.7 | (29/2+) | ||
3018.1 5 | (37/2+) | 596.2 3 | 100 | 2421.9 | (33/2+) | ||
3635.6 7 | (41/2+) | 617.5? | 100 | 3018.1 | (37/2+) | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 4 - ν3/2[651],α=-1/2. | |||||||
133.47 7 | (3/2+) | 0.60 ns 10 | |||||
190.88 9 | (7/2+) | 48.3 2 57.4 3 135.8 1 | 10 3 24 6 100 12 | 142.61 133.47 55.08 | (5/2+) (3/2+) (5/2-) | ||
335.76 12 | (11/2+) | 96.3 3 129.0 1 144.9 1 | 15.0 22 78 11 100 11 | 239.51 206.70 190.88 | (9/2-) (9/2+) (7/2+) | ||
588.00 15 | (15/2+) | 241.1 2 252.2 1 | 74 11 100 11 | 347.05 335.76 | (13/2+) (11/2+) | ||
945.20 18 | (19/2+) | 357.2 1 | 100 | 588.00 | (15/2+) | ||
1395.6 3 | (23/2+) | 450.4 2 | 100 | 945.20 | (19/2+) | ||
1923.5 4 | (27/2+) | 527.9 2 | 100 | 1395.6 | (23/2+) | ||
2510.5 5 | (31/2+) | 587.0 3 | 100 | 1923.5 | (27/2+) | ||
3141.8 7 | (35/2+) | 631.3? | 100 | 2510.5 | (31/2+) | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 5 - Band based on (3/2-). | |||||||
245.40 7 | (3/2-) | ≤ 0.12 ns | |||||
305.52 11 | (5/2-) | 114.6 3 157.8 2 162.9 3 172.1 3 250.4 8 305.5 2 | 14.3 13 29 5 23 6 33 7 22 3 100 9 | 190.88 147.73 142.61 133.47 55.08 0.0 | (7/2+) (7/2-) (5/2+) (3/2+) (5/2-) (3/2-) | ||
391.22 17 | (7/2-) | 200.3 2 248.5 4 336.3 3 | 81 19 69 19 100 25 | 190.88 142.61 55.08 | (7/2+) (5/2+) (5/2-) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
55.08 | (5/2-) | 55.1 1 | M1(+E2) | 0.42 LE | 7.5 | α=7.5 9 | |
133.47 | (3/2+) | 0.60 ns 10 | 78.4 1 | E1 | 0.474 | B(E1)(W.u.)=6.2E-5 +15-12, α=0.474 7 | |
(3/2+) | 0.60 ns 10 | 133.5 1 | [E1] | 0.1096 | B(E1)(W.u.)=1.35E-4 +27-20, α=0.1096 16 | ||
142.61 | (5/2+) | 87.5 1 | E1 | 0.351 | α=0.351 5 | ||
147.73 | (7/2-) | 92.6 1 | E2(+M1) | 2.1 | α=2.1 6 | ||
245.40 | (3/2-) | ≤ 0.12 ns | 102.8 1 | [E1] | 0.2253 | B(E1)(W.u.)≥6.6E-5, α=0.2253 32 | |
(3/2-) | ≤ 0.12 ns | 112.0 2 | [E1] | 0.1779 | B(E1)(W.u.)≥2.1E-4, α=0.1779 26 | ||
(3/2-) | ≤ 0.12 ns | 190.3 2 | [M1+E2] | 0.206 | α=0.206 11 | ||
(3/2-) | ≤ 0.12 ns | 245.4 1 | [M1+E2] | 0.0956 | α=0.0956 29 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | (3/2-) | 5.12 s 25 % β- = 100 | E(level): ν3/2[532],α=-1/2. Jπ(level): From systematic trends of spacings of band members in n=91 isotones from 151Nd to 161Yb. |
55.08 | (5/2-) | E(level): ν3/2[532],α=+1/2. Jπ(level): From systematic trends of spacings of band members in n=91 isotones from 151Nd to 161Yb. | |
133.47 | (3/2+) | 0.60 ns 10 | E(level): ν3/2[651],α=-1/2. |
142.61 | (5/2+) | E(level): ν3/2[651],α=+1/2. | |
147.73 | (7/2-) | E(level): ν3/2[532],α=-1/2. Jπ(level): From systematic trends of spacings of band members in n=91 isotones from 151Nd to 161Yb. | |
190.88 | (7/2+) | E(level): ν3/2[651],α=-1/2. | |
206.70 | (9/2+) | 3.7 ns 5 | E(level): ν3/2[651],α=+1/2. |
239.51 | (9/2-) | E(level): ν3/2[532],α=+1/2. | |
245.40 | (3/2-) | ≤ 0.12 ns | E(level): Band based on (3/2-). |
305.52 | (5/2-) | E(level): Band based on (3/2-). | |
335.76 | (11/2+) | E(level): ν3/2[651],α=-1/2. | |
347.05 | (13/2+) | E(level): ν3/2[651],α=+1/2. | |
391.22 | (7/2-) | E(level): Band based on (3/2-). | |
403.68 | (11/2-) | E(level): ν3/2[532],α=-1/2. | |
525.69 | (13/2-) | E(level): ν3/2[532],α=+1/2. | |
588.00 | (15/2+) | E(level): ν3/2[651],α=-1/2. | |
588.45 | (17/2+) | E(level): ν3/2[651],α=+1/2. | |
752.18 | (15/2-) | E(level): ν3/2[532],α=-1/2. | |
896.79 | (17/2-) | E(level): ν3/2[532],α=+1/2. | |
931.65 | (21/2+) | E(level): ν3/2[651],α=+1/2. | |
945.20 | (19/2+) | E(level): ν3/2[651],α=-1/2. | |
1163.2 | (19/2-) | E(level): ν3/2[532],α=-1/2. | |
1329.0 | (21/2-) | E(level): ν3/2[532],α=+1/2. | |
1362.7 | (25/2+) | E(level): ν3/2[651],α=+1/2. | |
1395.6 | (23/2+) | E(level): ν3/2[651],α=-1/2. | |
E(level) | Jπ(level) | T1/2(level) | Comments |
1621.0 | (23/2-) | E(level): ν3/2[532],α=-1/2. | |
1803.9 | (25/2-) | E(level): ν3/2[532],α=+1/2. | |
1864.7 | (29/2+) | E(level): ν3/2[651],α=+1/2. | |
1923.5 | (27/2+) | E(level): ν3/2[651],α=-1/2. | |
2313.4 | (29/2-) | E(level): ν3/2[532],α=+1/2. | |
2421.9 | (33/2+) | E(level): ν3/2[651],α=+1/2. | |
2510.5 | (31/2+) | E(level): ν3/2[651],α=-1/2. | |
3018.1 | (37/2+) | E(level): ν3/2[651],α=+1/2. | |
3141.8 | (35/2+) | E(level): ν3/2[651],α=-1/2. | |
3635.6 | (41/2+) | E(level): ν3/2[651],α=+1/2. |
E(level) | E(gamma) | Comments |
133.47 | 78.4 | I(γ): from β- decay. Value of 35 11 from 248Cm SF decay is in poor agreement |
190.88 | 57.4 | E(γ): γ from 248Cm SF, not reported in β- decay |
206.70 | 15.8 | E(γ): From 248Cm SF decay, the placement is based on analysis and discussion in 2002Sy01 | 64.0 | E(γ): From 248Cm SF decay, the placement is based on analysis and discussion in 2002Sy01 |
288.97 | 101.5 | E(γ): γ from 248Cm SF only | 233.9 | E(γ): γ from β- only |
335.76 | 129.0 | I(γ): 28 in 252Cf SF is in poor agreement |
931.65 | 343.2 | M(γ): From DCO ratio in 248Cm SF |
1362.7 | 431.0 | M(γ): From DCO ratio in 248Cm SF |
3141.8 | 631.3 | E(γ): this γ was not seen in 248Cm SF decay (2012Ur04) |
3635.6 | 617.5 | E(γ): this γ was not seen consistently in γγ-coin data in 248Cm SF decay (2012Ur04) |
Production and identification of 149Ce: 1973SeYX, 1977Pf01, 1979En02.
Mass measurements: 2006Sa56, 2004Cl07.
2001Ka50: theory: calculated total Routhian surface, and angular momentum vs rotational frequency plot.
Other theoretical studies: consult the NSR database at www.nndc.bnl.gov/nsr/ for four references for nuclear structure, listed under ’document records’ which can be accessed through web retrieval of the ENSDF database at www.nndc.bnl.gov/ensdf/
Q-value: S(2n)=10799 13, S(2p)=20984 22 (2021Wa16)