ADOPTED LEVELS, GAMMAS for 146La
Authors: Yu. Khazov, A. Rodionov and G. Shulyak | Citation: Nucl. Data Sheets 136, 163 (2016) | Cutoff date: 14-Jul-2016
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=6590 keV 30 | S(n)= 4280 keV 40 | S(p)= 8820 keV 30 | Q(α)= -950 keV 30 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 146Ba β- decay | B | 252Cf,254Cf SF decay |
| C | 235U(n,Fγ) E=THERMAL | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | AB | (2-) | 6.1 s 3 % β- = 100 % β-n ≤ 0.007 | |||||
| 0.0+X | ABC | (6-) | 9.8 s 4 % β- = 100 % IT = ? | |||||
| 121.16 5 | A | 1-,2- | 121.2 1 | 100 | M1+E2 | 0.0 | (2-) | |
| 130.87+X 19 | BC | 15 ns 3 | 130.73 22 | 100 | E2 | 0.0+X | (6-) | |
| 140.84 5 | A | (2-) | 140.7 1 | 100 | M1+E2 | 0.0 | (2-) | |
| 144.60 7 | A | (3-) | 4.0S 144.7 1 | 0.20 6 100 3 | M1+E2 | 140.84 0.0 | (2-) (2-) | |
| 197.08 5 | A | (1-) | 56.4 1 75.9 1 197.0 1 | 6.0 6 1.0 1 100 3 | (M1+E2) M1+E2 | 140.84 121.16 0.0 | (2-) 1-,2- (2-) | |
| 213.31+X 25 | BC | 12 ns 2 | 82.23 21 | 100 | D,E2 | 130.87+X | ||
| 279.0+X 3 | B | 148.2 3 | 100 | D,E2 | 130.87+X | |||
| 289.75+X 20 | B | 12 ns 2 | 158.91 15 290.0 3 | | 130.87+X 0.0+X | (6-) | ||
| 294.93 5 | A | (2) | 97.7 1 294.9 3 | 6.8 5 100 3 | 197.08 0.0 | (1-) (2-) | ||
| 326.70 7 | A | (3) | 182.2 2 185.9 1 326.3 2 | 18 5 100 3 23 7 | D+Q | 144.60 140.84 0.0 | (3-) (2-) (2-) | |
| 372.51 4 | A | 1+ | 77.7 1 175.3 1 231.6 1 251.2 1 372.5 1 | 4.6 5 24.5 6 55.0 12 100 3 5.1 7 | (E1) (E1) (E1) (E1) | 294.93 197.08 140.84 121.16 0.0 | (2) (1-) (2-) 1-,2- (2-) | |
| 392.55 5 | A | (2+) | 392.5 1 | 100 | D+Q | 0.0 | (2-) | |
| 409.89 8 | A | (3) | 114.9 1 | 100 | (M1) | 294.93 | (2) | |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 417.56 6 | A | (2) | 220.7 1 272.9 3 417.5 1 | 17 1 20 4 100 6 | 197.08 144.60 0.0 | (1-) (3-) (2-) | ||
| 429.17 5 | A | 2- | 284.5 3 429.3 2 | 45.0 14 100 3 | M1+E2 M1+E2 | 144.60 0.0 | (3-) (2-) | |
| 438.98 5 | A | 1- | 144.1 1 241.8 3 298.0 1 317.9 3 439.0 1 | 7.3 11 66 2 100.0 23 9.3 20 32.0 13 | M1+E2 D(+Q) | 294.93 197.08 140.84 121.16 0.0 | (2) (1-) (2-) 1-,2- (2-) | |
| 443.58 11 | A | (1-) | 148.7 246.6 3 322.2 2 443.5 2 | 12.5 21 100 6 52 8 46 8 | 294.93 197.08 121.16 0.0 | (2) (1-) 1-,2- (2-) | ||
| 466.54 5 | A | 2+ | 94.0 1 139.8 1 171.6 1 269.6 3 466.8 1 | 3.0 3 21.0 7 9.0 13 100 3 20 7 | D | 372.51 326.70 294.93 197.08 0.0 | 1+ (3) (2) (1-) (2-) | |
| 488.12 7 | A | (1-,2-) | 193.3 290.6 3 343.7 3 488.0 1 | 5 1 42 5 11 1 100 9 | 294.93 197.08 144.60 0.0 | (2) (1-) (3-) (2-) | ||
| 500.09 6 | A | (1-,2-) | 173.3 355.6 3 359.1 2 500.1 1 | 13.0 14 100 6 35 7 37 6 | 326.70 144.60 140.84 0.0 | (3) (3-) (2-) (2-) | ||
| 574.52 5 | A | (1-,2) | 107.9 1 145.3 1 164.6 1 247.8 3 279.5 1 377.5 1 433.6 4 574.5 1 | 9.6 12 21 4 35 5 60 5 27 4 100 5 16 8 59 5 | 466.54 429.17 409.89 326.70 294.93 197.08 140.84 0.0 | 2+ 2- (3) (3) (2) (1-) (2-) (2-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 577.42+X 25 | B | 287.96 26 364.00 15 | | 289.75+X 213.31+X | ||||
| 619.8+X 4 | B | ≈ 20 ns | 42.3 3 S 340.8 3 | | 577.42+X 279.0+X | |||
| 647.09 5 | A | 1 | 146.9 1 158.9 1 180.3 208.5 2 218.0 2 254.4 274.3 1 352.0 1 450.0 1 506.2 | 21 4 37 3 17 3 16 4 30 3 21 4 91 11 39 4 100 6 17 3 | 500.09 488.12 466.54 438.98 429.17 392.55 372.51 294.93 197.08 140.84 | (1-,2-) (1-,2-) 2+ 1- 2- (2+) 1+ (2) (1-) (2-) | ||
| 675.13 7 | A | (1-,2-) | 478.8 2 530.6 1 534.1 1 | 72 12 100 8 96 16 | 197.08 144.60 140.84 | (1-) (3-) (2-) | ||
| 686.81 8 | A | (1,2-) | 198.4 247.5 314.0 1 360.2 3 | 26 3 39 6 100 10 45 16 | 488.12 438.98 372.51 326.70 | (1-,2-) 1- 1+ (3) | ||
| 708.79 7 | A | 1+ | 209.1 270.9 3 279.5 1 291.5 3 316.3 1 335.8 2 511.9 568.2 2 | 3.6 7 33.9 18 100 4 25 4 68 4 6.5 14 11.6 11 7.2 18 | D D | 500.09 438.98 429.17 417.56 392.55 372.51 197.08 140.84 | (1-,2-) 1- 2- (2) (2+) 1+ (1-) (2-) | |
| 722.38 7 | A | (1-,2-) | 283.2 3 349.5 3 525.7 2 722.5 1 | 21 6 96 2 19 8 100 10 | 438.98 372.51 197.08 0.0 | 1- 1+ (1-) (2-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 757.78 10 | A | (1,2-) | 347.6 4 385.4 1 617.0 | 100 19 100 15 38 8 | 409.89 372.51 140.84 | (3) 1+ (2-) | ||
| 758.1+X 5 | B | 138.3 3 | 100 | 619.8+X | ||||
| 880.22 5 | A | 1+ | 380.1 3 413.6 1 436.4 2 441.2 1 462.6 2 487.7 507.8 3 585.6 2 683.4 2 759.1 1 880.2 1 | 15 3 100 4 14 4 86 4 10.0 19 36 4 46 8 13.8 19 11.3 25 39 4 41.9 25 | M1+E2 D M1+E2 | 500.09 466.54 443.58 438.98 417.56 392.55 372.51 294.93 197.08 121.16 0.0 | (1-,2-) 2+ (1-) 1- (2) (2+) 1+ (2) (1-) 1-,2- (2-) | |
| 1005.4 3 | A | (1) | 296.5 612.9 3 | 62 40 100 30 | 708.79 392.55 | 1+ (2+) | ||
| 1028.2+X 5 | B | 270.1 2 | 100 | 758.1+X | ||||
| 1041.37 10 | A | (1) | 466.8 1 669.1 2 | 100 16 61 30 | 574.52 372.51 | (1-,2) 1+ | ||
| 1064.50 5 | A | 1+ | 342.3 1 355.6 3 389.7 2 489.8 1 564.4 1 576.3 2 598.4 2 635.2 1 672.0 692.0 1 768.9 2 1064.7 1 | 57.6 4 14.1 2 27.3 6 58 4 39 5 14 4 19 5 40 4 11 3 100 4 15.2 58 12 | 722.38 708.79 675.13 574.52 500.09 488.12 466.54 429.17 392.55 372.51 294.93 0.0 | (1-,2-) 1+ (1-,2-) (1-,2) (1-,2-) (1-,2-) 2+ 2- (2+) 1+ (2) (2-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1181.76 8 | A | 1+ | 301.4 3 607.8 1 681.8 4 715.3 2 742.8 2 752.6 1 764.3 788.8 2 809.0 2 1061.4 3 1182.3 4 | 24 5 44 8 21 6 29 6 34 5 100 10 16 3 16 3 47 10 17.7 16 9.7 30 | 880.22 574.52 500.09 466.54 438.98 429.17 417.56 392.55 372.51 121.16 0.0 | 1+ (1-,2) (1-,2-) 2+ 1- 2- (2) (2+) 1+ 1-,2- (2-) | ||
| 1190.38 8 | A | 1+ | 431.4 3 502.8 702.0 724.0 1 750.8 3 760.8 3 818.0 2 993.2 2 1049.2 4 | 26.5 24 21 7 34 4 100 6 25 7 7.2 12 21.7 24 30.1 24 7 4 | 757.78 686.81 488.12 466.54 438.98 429.17 372.51 197.08 140.84 | (1,2-) (1,2-) (1-,2-) 2+ 1- 2- 1+ (1-) (2-) | ||
| 1224.06 9 | A | 1+ | 735.8 2 785.2 795.2 2 851.5 1 | 55 5 100 30 73 14 45 5 | 488.12 438.98 429.17 372.51 | (1-,2-) 1- 2- 1+ | ||
| 1268.94 6 | A | 1+ | 388.5 2 546.4 3 621.6 2 802.5 2 829.9 851.5 1 876.5 1 896.7 2 973.8 1 1128.1 | 56.8 14 18 7 48 7 100 10 9.1 23 11.4 23 36.4 23 50 5 22.7 23 30 5 | 880.22 722.38 647.09 466.54 438.98 417.56 392.55 372.51 294.93 140.84 | 1+ (1-,2-) 1 2+ 1- (2) (2+) 1+ (2) (2-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1308.43 15 | A | (1) | 550.9 733.9 3 842.0 2 869.1 3 | 27 4 42 15 100 12 65 30 | 757.78 574.52 466.54 438.98 | (1,2-) (1-,2) 2+ 1- | ||
| 1415.73 9 | A | (1) | 841.0 2 1023.0 2 1043.3 1 | 100 16 47 11 90 5 | 574.52 392.55 372.51 | (1-,2) (2+) 1+ | ||
| 1425.3+X 6 | B | 397.1 3 | 100 | 1028.2+X | ||||
| 1443.44 6 | A | 1+ | 868.8 2 943.4 1 955.3 3 976.8 1 1003.8 2 1050.9 4 1070.8 1 1148.7 1 1247.0 2 | 49 9 24.7 12 11.8 24 25.9 24 11.8 12 27 3 100 5 11.8 12 11.8 12 | 574.52 500.09 488.12 466.54 438.98 392.55 372.51 294.93 197.08 | (1-,2) (1-,2-) (1-,2-) 2+ 1- (2+) 1+ (2) (1-) | ||
| 1469.12 6 | A | 1+ | 821.8 1 894.6 1 981.2 1002.0 3 1040.1 1 1076.5 1 1097.1 2 1174.5 3 1328.5 | 50.0 22 100 17 3.3 11 6.6 22 26.7 11 35.6 22 23 10 20 3 5.6 11 | 647.09 574.52 488.12 466.54 429.17 392.55 372.51 294.93 140.84 | 1 (1-,2) (1-,2-) 2+ 2- (2+) 1+ (2) (2-) | ||
| 1481.45 7 | A | 1+ | 773.0 4 834.2 2 1052.4 2 1088.9 1 1108.9 1 1341.2 | 34 14 66 14 97 3 76 3 100 3 72 10 | 708.79 647.09 429.17 392.55 372.51 140.84 | 1+ 1 2- (2+) 1+ (2-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1507.68 11 | A | 1068.9 1078.5 1 | 32 5 100 11 | 438.98 429.17 | 1- 2- | |||
| 1534.39 6 | A | 1+ | 847.3 1 887.1 1 1068.0 1 1095.5 1 1105.3 1 1142.2 5 1162.0 1 1337.1 6 | 42.2 11 38.9 22 62.2 22 100 3 56.7 11 5.6 22 24.4 11 6.7 22 | 686.81 647.09 466.54 438.98 429.17 392.55 372.51 197.08 | (1,2-) 1 2+ 1- 2- (2+) 1+ (1-) | ||
| 1606.43 24 | A | 565.4 5 1213.8 1311.4 3 | 55 18 100 18 73 18 | 1041.37 392.55 294.93 | (1) (2+) (2) | |||
| 1624.35 7 | A | 1+ | 745.2 2 867.0 2 915.5 2 949.0 1 1186.7 1 1195.4 1207.2 1231.6 2 1484.0 1503.3 1 | 44 11 63 19 59 7 19 4 100 4 74 7 41 7 26 4 81 11 100 7 | 880.22 757.78 708.79 675.13 438.98 429.17 417.56 392.55 140.84 121.16 | 1+ (1,2-) 1+ (1-,2-) 1- 2- (2) (2+) (2-) 1-,2- | ||
| 1650.77 8 | A | 1184.2 1 1211.8 1 1258.2 1453.7 | 89 6 100 30 33 6 39 6 | 466.54 438.98 392.55 197.08 | 2+ 1- (2+) (1-) | |||
| 1693.31 12 | A | 814.2 4 1226.8 2 1253.7 2 1321.1 2 1495.0 2 | 67 30 33 7 93 7 100 7 80 13 | 880.22 466.54 438.98 372.51 197.08 | 1+ 2+ 1- 1+ (1-) | |||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1722.30 14 | A | 1013.4 2 1283.4 3 1350.1 3 1427.2 3 1525.2 | 65 25 45 5 100 15 45 5 25 5 | 708.79 438.98 372.51 294.93 197.08 | 1+ 1- 1+ (2) (1-) | |||
| 1777.68 14 | A | 1+ | 1203.4 2 1339.0 3 1384.9 1405.0 3 1481.8 4 1656.2 | 80 14 100 14 100 14 50 14 71 14 43 7 | 574.52 438.98 392.55 372.51 294.93 121.16 | (1-,2) 1- (2+) 1+ (2) 1-,2- | ||
| 1882.08 19 | A | 1443.1 2 1489.5 | 100 30 32 5 | 438.98 392.55 | 1- (2+) | |||
| 1935.1+X 7 | B | 509.8 3 | 100 | 1425.3+X | ||||
| 2060.51 24 | A | 1642.9 3 1919.8 1939.3 | 100 19 15 4 23 4 | 417.56 140.84 121.16 | (2) (2-) 1-,2- | |||
| 2165.88 17 | A | 1+ | 1102.0 3 1456.8 1773.2 1870.5 3 2044.6 4 | 89 11 100 22 44 11 89 22 89 22 | 1064.50 708.79 392.55 294.93 121.16 | 1+ 1+ (2+) (2) 1-,2- | ||
| 2541.2+X 8 | B | 606.1 3 | 100 | 1935.1+X | ||||
E(level): From a least-squares fit to Eγ’s, normalized χ2=1.6. If ΔEγ not given, |+0.50 keV assumed by the evaluators. Eleven transition energies were not used in the fitting because their values differ from the intervals between the corresponding levels by more than three uncertainties. See the commentary to the transitions.
Jπ(level): Based on 4.8|<log| ft|<6.2 values in 146Ba, Jπ=0+ β- decay, decay pattern and/or angular correlations (1985Ch16), unless indicated otherwise.
T1/2(level): From Iγ(t) in 254Cf SF decay (1981SeZW) except as noted
E(γ): From 146Ba β- decay and 252,254Cf SF decay. ΔEγ=0.5 keV assumed by the evaluators, unless indicated otherwise
I(γ): Relative Iγ branching from each level
M(γ): From γγ(θ) and α(exp), except as noted
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 121.16 | 1-,2- | 121.2 1 | M1+E2 | +0.04 10 | 0.627 | α=0.627 12 | |
| 130.87+X | 15 ns 3 | 130.73 22 | E2 | 0.771 | α=0.771 | ||
| 140.84 | (2-) | 140.7 1 | M1+E2 | -0.66 +11-15 | 0.468 | α=0.468 19 | |
| 144.60 | (3-) | 144.7 1 | M1+E2 | +0.61 10 | 0.424 | α=0.424 12 | |
| 197.08 | (1-) | 56.4 1 | (M1+E2) | 11 | α=11 6 | ||
| (1-) | 197.0 1 | M1+E2 | -0.10 +13-15 | 0.1630 | α=0.1630 25 | ||
| 326.70 | (3) | 185.9 1 | D+Q | -0.01 +10-9 | |||
| 372.51 | 1+ | 175.3 1 | (E1) | 0.0500 | α=0.0500 | ||
| 1+ | 231.6 1 | (E1) | 0.0235 | α=0.0235 | |||
| 1+ | 251.2 1 | (E1) | 0.0189 | α=0.0189 | |||
| 1+ | 372.5 1 | (E1) | 0.00690 | α=0.00690 | |||
| 409.89 | (3) | 114.9 1 | (M1) | 0.728 | α=0.728 | ||
| 429.17 | 2- | 284.5 3 | M1+E2 | +0.39 +15-35 | 0.0601 | α=0.0601 11 | |
| 2- | 429.3 2 | M1+E2 | +0.66 +10-12 | 0.0194 | α=0.0194 5 | ||
| 438.98 | 1- | 241.8 3 | M1+E2 | -0.22 8 | 0.0936 | α=0.0936 | |
| 1- | 298.0 1 | D(+Q) | -0.009 +10-9 | ||||
| 880.22 | 1+ | 413.6 1 | M1+E2 | -0.33 +8-9 | 0.0225 | α=0.0225 5 | |
| 1+ | 507.8 3 | M1+E2 | +0.37 +18-13 | 0.0133 | α=0.0133 5 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| E(level) | E(gamma) | Comments |
| 121.16 | 121.2 | E(γ): 121.169 3 (1979Bo26, curved cryst). |
| 140.84 | 140.7 | E(γ): 140.511 14 (1979Bo26, curved cryst). |
| 197.08 | 197.0 | E(γ): 197.316 7 (1979Bo26, curved cryst). |
| 213.31+X | 82.23 | M(γ): From RUL |
| 279.0+X | 148.2 | M(γ): From RUL |
| 372.51 | 175.3 | E(γ): 175.338 6 (1979Bo26, curved cryst). | 231.6 | E(γ): 231.805 2 (1979Bo26, curved cryst). | 251.2 | E(γ): 251.144 17 (1979Bo26, curved cryst). |
| 392.55 | 392.5 | E(γ): 393.251 32 (1979Bo26, curved cryst). |
| 438.98 | 241.8 | E(γ): 241.652 37 (1979Bo26, curved cryst). | 298.0 | E(γ): 298.794 16 (1979Bo26, curved cryst). |
| 466.54 | 269.6 | E(γ): 269.519 45 (1979Bo26, curved cryst). | 466.8 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
| 500.09 | 355.6 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
| 574.52 | 279.5 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
| 675.13 | 478.8 | E(γ): poor fit: the energy level difference equals 478.07 8. Energy of γ ray is not used in a least-squares fitting |
| 708.79 | 270.9 | E(γ): poor fit: the energy level difference equals 269.80 7. Energy of γ ray is not used in a least-squares fitting | 279.5 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
| 1041.37 | 466.8 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
| 1064.50 | 355.6 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity | 768.9 | E(γ): poor fit: the energy level difference equals 769.57 7. Energy of γ ray is not used in a least-squares fitting | 1064.7 | E(γ): poor fit: the energy level difference equals 1064.47 5. Energy of γ ray is not used in a least-squares fitting |
| 1181.76 | 607.8 | E(γ): poor fit: the energy level difference equals 607.23 8. Energy of γ ray is not used in a least-squares fitting |
| 1190.38 | 431.4 | E(γ): poor fit: the energy level difference equals 432.60 12. Energy of γ ray is not used in a least-squares fitting | 502.8 | E(γ): poor fit: the energy level difference equals 503.57 11 |
| E(level) | E(gamma) | Comments |
| 1224.06 | 851.5 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
| 1268.94 | 851.5 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
| 1443.44 | 1003.8 | E(γ): poor fit: the energy level difference equals 1004.50 7. Energy of γ ray is not used in a least-squares fitting | 1247.0 | E(γ): poor fit: the energy level difference equals 1246.42 6. Energy of γ ray is not used in a least-squares fitting |
| 1624.35 | 745.2 | E(γ): poor fit: the energy level difference equals 744.13 8. Energy of γ ray is not used in a least-squares fitting | 1186.7 | E(γ): poor fit: the energy level difference equals 1185.36 8. Energy of γ ray is not used in a least-squares fitting |
| 1693.31 | 1495.0 | E(γ): poor fit: the energy level difference equals 1496.24 12. Energy of γ ray is not used in a least-squares fitting |
Produced and identified by 1970Wa05 (1969WiZX,1966WaZX) in the products of the 252,254Cf SF decay. The experimental results obtained in the 146La β- decay using different properties of three on-line separators OSTIN, LOHENGRIN and JOSEF clearly indicate the existence of the two levels in 146La with lower and higher spins and T1/2=6.2 s and T1/2=10 s, correspondingly (1978Mo33 and 1978MoYW). Their availability were suggested by other searches (1974Ar17,1977Sk02,1979En02,1979Ke02,1982Br23,1981De25,1993Sh10). J=(6-) for the 10 s isomeric state was firmly established by 1979Ke02 when studying the β- decay of 146La. No electron peaks corresponding to the E4 or M5 transitions of unplaced γ rays had been observed, therefore IT transition must be very weak if present (1993Sh10).