ADOPTED LEVELS, GAMMAS for 172Er
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 08-DEC-2015
Author: Balraj Singh | Citation: Nucl. Data Sheets 75,199 (1995) | Cutoff date: 31-May-1995
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=891 keV 5 | S(n)= 6836 keV 4 | S(p)= 925×101 keV 60 | Q(α)= -35×101 keV 14 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 172Ho β- decay (25 S) | B | 170Er(t,p) |
| C | 170Er(136Xe,xγ) | D | 170Er(238U,xγ) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABCD | 0+ | 49.3 h 5 % β- = 100 | |||||
| 77.0 2 | ABCD | (2+) | 77.0 2 | 100 | [E2] | 0.0 | 0+ | |
| 255.2 3 | ABCD | (4+) | 178.1 2 | 100 | [E2] | 77.0 | (2+) | |
| 530.2 3 | CD | (6+) | 275.0 2 | | 255.2 | (4+) | ||
| 834.3 6 | A | 757.2 7 | 100 | 77.0 | (2+) | |||
| 897.9 4 | CD | (8+) | 367.7 2 | | 530.2 | (6+) | ||
| 961.4 4 | AB | (1,2+) | 884.4 5 961.4 5 | 73 20 100 23 | 77.0 0.0 | (2+) 0+ | ||
| 1034.4 3 | ABC | (3+) | 779.3 2 957.3 2 1033.7 6 ? | 100 27 32 23 | [M3] | 255.2 77.0 0.0 | (4+) (2+) 0+ | |
| 1125.5 6 | AB | 291.1 5 | 100 | 834.3 | ||||
| 1131.3 3 | C | (4+) | 876.1 2 1054.5 2 | | 255.2 77.0 | (4+) (2+) | ||
| 1251.5 3 | C | (5+) | 721.6 2 996.3 2 | | 530.2 255.2 | (6+) (4+) | ||
| 1263.3 3 | A C | (4-) | 39.5 ns 21 | 137.8 6 229.4 6 1008.1 5 1186.1 6 | 54 13 40 3 100 3 62 19 | [D,E2] [E1] [E1] [M2] | 1125.5 1034.4 255.2 77.0 | (3+) (4+) (2+) |
| 1280 3 | B | |||||||
| 1322 3 | B | 0+ | ||||||
| 1351.7 4 | CD | (10+) | 453.8 2 | | 897.9 | (8+) | ||
| 1367.2 3 | C | (5-) | 103.8 2 1112.0 2 | | 1263.3 255.2 | (4-) (4+) | ||
| 1390 3 | B | |||||||
| 1396.9 4 | A | (3+,4+,5+) | 133.6 3 1141.7 5 | 100 11 4 | (E1) | 1263.3 255.2 | (4-) (4+) | |
| 1470 3 | B | 0+ | ||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1491.3 3 | C | (6-) | 124.1 2 228.0 2 | 100 30 3 | 1367.2 1263.3 | (5-) (4-) | ||
| 1495 3 | B | |||||||
| 1500.9 3 | C | (6+) | 0.57 µs 6 | 133.6 2 249.6 2 369.7 2 970.5 2 | 100 3 11.3 8 12.1 8 6.2 8 | E1 [M1] [E2] [M1] | 1367.2 1251.5 1131.3 530.2 | (5-) (5+) (4+) (6+) |
| 1635.0 3 | C | (7-) | 143.8 2 267.6 2 | 100 47 5 | 1491.3 1367.2 | (6-) (5-) | ||
| 1654.3 3 | C | (7+) | 153.3 2 | | 1500.9 | (6+) | ||
| 1713 3 | B | |||||||
| 1729 3 | B | |||||||
| 1792.4 3 | C | (7-) | 138.1 2 291.4 2 | | 1654.3 1500.9 | (7+) (6+) | ||
| 1798.9 4 | C | (8-) | 163.8 2 307.7 2 | 100 92 9 | 1635.0 1491.3 | (7-) (6-) | ||
| 1820 3 | B | |||||||
| 1828.5 3 | C | (8+) | 174.0 2 327.7 2 | 100 32 7 | 1654.3 1500.9 | (7+) (6+) | ||
| 1843 3 | B | |||||||
| 1885.3 5 | CD | (12+) | 533.6 2 | | 1351.7 | (10+) | ||
| 1906 3 | B | |||||||
| 1926 3 | B | |||||||
| 1945.0 4 | C | (8-) | 152.6 2 | | 1792.4 | (7-) | ||
| 1950 3 | B | |||||||
| 1980.9 4 | C | (9-) | 182 1 345.9 2 | | 1798.9 1635.0 | (8-) (7-) | ||
| 1983 3 | B | |||||||
| 2004 3 | B | |||||||
| 2022.1 4 | C | (9+) | 193.6 2 368 1 | | 1828.5 1654.3 | (8+) (7+) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 2110.7 4 | C | (9-) | 165.5 2 318.4 2 | 100 48 7 | 1945.0 1792.4 | (8-) (7-) | ||
| 2234 3 | B | |||||||
| 2253 3 | B | |||||||
| 2286 3 | B | |||||||
| 2294.5 4 | C | (10-) | 183.6 2 349.7 2 | | 2110.7 1945.0 | (9-) (8-) | ||
| 2308 3 | B | |||||||
| 2382 3 | B | |||||||
| 2403 3 | B | 0+ | ||||||
| 2474 3 | B | |||||||
| 2490.3 11 | D | (14+) | 605 1 | | 1885.3 | (12+) | ||
| 2498.5 5 | C | (11-) | 204.0 2 388 1 | | 2294.5 2110.7 | (10-) (9-) | ||
| 2502 3 | B | |||||||
| 2545 3 | B | |||||||
| 2635 3 | B | |||||||
| 2657 3 | B | |||||||
| 2679 3 | B | |||||||
| 2697 3 | B | |||||||
| 2741 3 | B | |||||||
| 2768 3 | B | |||||||
| 2789 3 | B | |||||||
| 2807 3 | B | |||||||
| 2827 3 | B | |||||||
| 2856 3 | B | |||||||
| 3164.3 15 | D | (16+) | 674 1 | | 2490.3 | (14+) | ||
| 3898.3 18 | D | (18+) | 734 1 | | 3164.3 | (16+) | ||
| 4686.3 21 | D | (20+) | 788 1 | | 3898.3 | (18+) | ||
| 5528.3 23 | D | (22+) | 842 1 | | 4686.3 | (20+) | ||
E(level): From least-squares fit to Eγ values
Jπ(level): As proposed by 2010Dr02 based on band structures and γ-decay pattern, unless otherwise stated
E(γ): Values are from 170Er(136Xe,Xγ) when available, otherwise from 172Ho β- decay
I(γ): Primarily from 172Ho β- decay. Only for a few high-spin values are available from (136Xe,Xγ)
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - Kπ=0+ g.s. band. | |||||||
| 0.0 | 0+ | 49.3 h 5 % β- = 100 | |||||
| 77.0 2 | (2+) | 77.0 2 | 100 | [E2] | 0.0 | 0+ | |
| 255.2 3 | (4+) | 178.1 2 | 100 | [E2] | 77.0 | (2+) | |
| 530.2 3 | (6+) | 275.0 2 | | 255.2 | (4+) | ||
| 897.9 4 | (8+) | 367.7 2 | | 530.2 | (6+) | ||
| 1351.7 4 | (10+) | 453.8 2 | | 897.9 | (8+) | ||
| 1885.3 5 | (12+) | 533.6 2 | | 1351.7 | (10+) | ||
| 2490.3 11 | (14+) | 605 1 | | 1885.3 | (12+) | ||
| 3164.3 15 | (16+) | 674 1 | | 2490.3 | (14+) | ||
| 3898.3 18 | (18+) | 734 1 | | 3164.3 | (16+) | ||
| 4686.3 21 | (20+) | 788 1 | | 3898.3 | (18+) | ||
| 5528.3 23 | (22+) | 842 1 | | 4686.3 | (20+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 2 - Kπ=2+ γ-vibrational band | |||||||
| 1034.4 3 | (3+) | ||||||
| 1131.3 3 | (4+) | 876.1 2 1054.5 2 | | 255.2 77.0 | (4+) (2+) | ||
| 1251.5 3 | (5+) | 721.6 2 996.3 2 | | 530.2 255.2 | (6+) (4+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 3 - Kπ=(4-) band. | |||||||
| 1263.3 3 | (4-) | 39.5 ns 21 | |||||
| 1367.2 3 | (5-) | 103.8 2 1112.0 2 | | 1263.3 255.2 | (4-) (4+) | ||
| 1491.3 3 | (6-) | 124.1 2 228.0 2 | 100 30 3 | 1367.2 1263.3 | (5-) (4-) | ||
| 1635.0 3 | (7-) | 143.8 2 267.6 2 | 100 47 5 | 1491.3 1367.2 | (6-) (5-) | ||
| 1798.9 4 | (8-) | 163.8 2 307.7 2 | 100 92 9 | 1635.0 1491.3 | (7-) (6-) | ||
| 1980.9 4 | (9-) | 182 1 345.9 2 | | 1798.9 1635.0 | (8-) (7-) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 4 - Kπ=(6+) band. | |||||||
| 1500.9 3 | (6+) | 0.57 µs 6 | |||||
| 1654.3 3 | (7+) | 153.3 2 | | 1500.9 | (6+) | ||
| 1828.5 3 | (8+) | 174.0 2 327.7 2 | 100 32 7 | 1654.3 1500.9 | (7+) (6+) | ||
| 2022.1 4 | (9+) | 193.6 2 368 1 | | 1828.5 1654.3 | (8+) (7+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 5 - Kπ=(7-) band. | |||||||
| 1792.4 3 | (7-) | ||||||
| 1945.0 4 | (8-) | 152.6 2 | | 1792.4 | (7-) | ||
| 2110.7 4 | (9-) | 165.5 2 318.4 2 | 100 48 7 | 1945.0 1792.4 | (8-) (7-) | ||
| 2294.5 4 | (10-) | 183.6 2 349.7 2 | | 2110.7 1945.0 | (9-) (8-) | ||
| 2498.5 5 | (11-) | 204.0 2 388 1 | | 2294.5 2110.7 | (10-) (9-) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 77.0 | (2+) | 77.0 2 | [E2] | 8.13 | α=8.13 15, α(K)=1.79 3, α(L)=4.85 9, α(M)=1.182 23, α(N)=0.267 5, α(O)=0.0310 6, α(P)=8.04×10-5 13 | |
| 255.2 | (4+) | 178.1 2 | [E2] | 0.372 | α=0.372, α(K)=0.227 4, α(L)=0.1116 17, α(M)=0.0267 4, α(N)=0.00607 9, α(O)=0.000741 11, α(P)=1.039×10-5 15 | |
| 1263.3 | (4-) | 39.5 ns 21 | 137.8 6 | [D,E2] | 0.64 | α=0.64 51 |
| (4-) | 39.5 ns 21 | 229.4 6 | [E1] | 0.0365 | B(E1)(W.u.)=6.3E-8 11, α=0.0365, α(K)=0.0307 5, α(L)=0.00451 7, α(M)=0.000995 16, α(N)=0.000230 4, α(O)=3.20E-5 5, α(P)=1.543E-6 24 | |
| (4-) | 39.5 ns 21 | 1008.1 5 | [E1] | 1.35×10-3 | B(E1)(W.u.)=1.8E-9 3, α=1.35E-3, α(K)=0.001150 17, α(L)=0.0001550 22, α(M)=3.39E-5 5, α(N)=7.89E-6 11, α(O)=1.139E-6 16, α(P)=6.30E-8 9 | |
| (4-) | 39.5 ns 21 | 1186.1 6 | [M2] | 0.00984 | B(M2)(W.u.)=0.0023 8, α=0.00984, α(K)=0.00825 12, α(L)=0.001236 18, α(M)=0.000275 4, α(N)=6.41×10-5 9, α(O)=9.29E-6 13, α(P)=5.16E-7 8 | |
| 1396.9 | (3+,4+,5+) | 133.6 3 | (E1) | 0.1507 | α=0.1507 23, α(K)=0.1259 20, α(L)=0.0194 3, α(M)=0.00428 7, α(N)=0.000983 15, α(O)=0.0001338 21, α(P)=5.91×10-6 9 | |
| 1500.9 | (6+) | 0.57 µs 6 | 133.6 2 | E1 | 0.1507 | B(E1)(W.u.)=1.09E-7 13, α=0.1507, α(K)=0.1259 19, α(L)=0.0194 3, α(M)=0.00428 7, α(N)=0.000983 15, α(O)=0.0001338 20, α(P)=5.91E-6 9 |
| (6+) | 0.57 µs 6 | 249.6 2 | [M1] | 0.219 | B(M1)(W.u.)=1.90×10-7 25, α=0.219, α(K)=0.184 3, α(L)=0.0272 4, α(M)=0.00603 9, α(N)=0.001406 20, α(O)=0.000204 3, α(P)=1.127E-5 16 | |
| (6+) | 0.57 µs 6 | 369.7 2 | [E2] | 0.0373 | B(E2)(W.u.)=0.00021 3, α=0.0373, α(K)=0.0285 4, α(L)=0.00684 10, α(M)=0.001583 23, α(N)=0.000364 6, α(O)=4.77E-5 7, α(P)=1.520E-6 22 | |
| (6+) | 0.57 µs 6 | 970.5 2 | [M1] | 0.00663 | B(M1)(W.u.)=1.8×10-9 3, α=0.00663, α(K)=0.00562 8, α(L)=0.000794 12, α(M)=0.0001750 25, α(N)=4.08E-5 6, α(O)=5.93E-6 9, α(P)=3.35E-7 5 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 49.3 h 5 % β- = 100 | See 1985Be34 for measured Δ<r2> and isotope shifts. E(level): Kπ=0+ g.s. band. |
| 77.0 | (2+) | E(level): Kπ=0+ g.s. band. | |
| 255.2 | (4+) | E(level): Kπ=0+ g.s. band. | |
| 530.2 | (6+) | E(level): Kπ=0+ g.s. band. | |
| 897.9 | (8+) | E(level): Kπ=0+ g.s. band. | |
| 1034.4 | (3+) | E(level): Kπ=2+ γ-vibrational band. | |
| 1131.3 | (4+) | E(level): Kπ=2+ γ-vibrational band. | |
| 1251.5 | (5+) | E(level): Kπ=2+ γ-vibrational band. | |
| 1263.3 | (4-) | 39.5 ns 21 | E(level): Kπ=(4-) band. |
| 1351.7 | (10+) | E(level): Kπ=0+ g.s. band. | |
| 1367.2 | (5-) | E(level): Kπ=(4-) band. | |
| 1491.3 | (6-) | E(level): Kπ=(4-) band. | |
| 1500.9 | (6+) | 0.57 µs 6 | E(level): Kπ=(6+) band. |
| 1635.0 | (7-) | E(level): Kπ=(4-) band. | |
| 1654.3 | (7+) | E(level): Kπ=(6+) band. | |
| 1792.4 | (7-) | E(level): Kπ=(7-) band. | |
| 1798.9 | (8-) | E(level): Kπ=(4-) band. | |
| 1828.5 | (8+) | E(level): Kπ=(6+) band. | |
| 1885.3 | (12+) | E(level): Kπ=0+ g.s. band. | |
| 1945.0 | (8-) | E(level): Kπ=(7-) band. | |
| 1980.9 | (9-) | E(level): Kπ=(4-) band. | |
| 2022.1 | (9+) | E(level): Kπ=(6+) band. | |
| 2110.7 | (9-) | E(level): Kπ=(7-) band. | |
| 2294.5 | (10-) | E(level): Kπ=(7-) band. | |
| 2490.3 | (14+) | E(level): Kπ=0+ g.s. band. | |
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 2498.5 | (11-) | E(level): Kπ=(7-) band. | |
| 3164.3 | (16+) | E(level): Kπ=0+ g.s. band. | |
| 3898.3 | (18+) | E(level): Kπ=0+ g.s. band. | |
| 4686.3 | (20+) | E(level): Kπ=0+ g.s. band. | |
| 5528.3 | (22+) | E(level): Kπ=0+ g.s. band. |
| E(level) | E(gamma) | Comments |
| 1034.4 | 779.3 | E(γ): γ from (136Xe,Xγ) only, not reported in β- decay | 1033.7 | E(γ): weak γ only from 172Ho decay, considered suspect by the evaluator since implied (M3) multipolarity is unlikely |
| 1263.3 | 137.8 | E(γ): γ only from 172Ho decay | 1186.1 | E(γ): from 172Ho decay only |
| 1396.9 | 133.6 | M(γ): from estimated α(exp) in 172Ho β- |
| 1500.9 | 133.6 | M(γ): from total conversion coefficient measured from delayed intensity balance in (136Xe,xγ) |
172Er identified by 1956Ne08 from high-energy fission of uranium followed by chemical separation. Later studies of decay of 172Er: 1961Ha42, 1961Or01, 1962Gu03, 1967Cl05, 1965Ha24, 1968Ha08, 1972Ba01, 1976MeZC
Nuclear structure theory calculations:
2013Ch02 and 2011Sh38: B(E2)
2011Te04: gamma- and beta-vibrational states, B(E2).
2009Ro17: analyzed energies, routhians, alignments, kinematic and dynamic moments of inertia
1981Na11: electric quadrupole, hexadecapole moment
Q-value: S(2n)=12518 4, S(2p)=17400 200 (syst) (2012Wa38)