ADOPTED LEVELS, GAMMAS for 226U
Authors: B. Singh and S. Singh | Citation: ENSDF | Cutoff date: 31-MAR-2014
Author: Y. A. Akovali | Citation: Nucl. Data Sheets 77,433 (1996) | Cutoff date: 1-Feb-1996
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-5450 keV SY | S(n)= 8120 keV 18 | S(p)= 4300 keV 70 | Q(α)= 7701 keV 4 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 230Pu α decay (102 S) | B | 208Pb(22Ne,4nγ) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | AB | 0+ | 268 ms 9 % α = 100 | |||||
| 81.3 6 | AB | (2+) | 81.3 6 | 100 | [E2] | 0.0 | 0+ | |
| 250.0 9 | B | (4+) | 168.7 6 | 100 | [E2] | 81.3 | (2+) | |
| 447.1 9 | B | (5-) | 197.0 2 | 100 | (E1) | 250.0 | (4+) | |
| 483.2 9 | B | (6+) | 233.3 3 | 100 | [E2] | 250.0 | (4+) | |
| 669.1 10 | B | (7-) | 185.7 5 221.7 5 | 100 31 6.3 19 | (E1) [E2] | 483.2 447.1 | (6+) (5-) | |
| 766.4 10 | B | (8+) | 97.5 5 283.6 4 | 100 33 100 20 | (E1) [E2] | 669.1 483.2 | (7-) (6+) | |
| 950.6 10 | B | (9-) | 184.4 5 281.0 4 | 100 28 8.3 33 | (E1) [E2] | 766.4 669.1 | (8+) (7-) | |
| 1091.6 10 | B | (10+) | 140.6 3 325.6 4 | 100 10 27 6 | (E1) [E2] | 950.6 766.4 | (9-) (8+) | |
| 1282.8 10 | B | (11-) | 191.1 4 332.3 4 | 100 18 16 6 | (E1) [E2] | 1091.6 950.6 | (10+) (9-) | |
| 1453.8 10 | B | (12+) | 171.0 4 362.2 4 | 100 30 42 15 | (E1) [E2] | 1282.8 1091.6 | (11-) (10+) | |
| 1656.3 11 | B | (13-) | 202.4 4 373.6 4 | 100 16 27 8 | (E1) [E2] | 1453.8 1282.8 | (12+) (11-) | |
| 1847.0 13 ? | B | (14+) | 191? 393? | | 1656.3 1453.8 | (13-) (12+) | ||
E(level): From least-squares fit to Eγ data
M(γ): E1 assignments are based on intensity balances (1998Gr19), E2 assignments are assumed to be based on band structures
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - The g.s. band | |||||||
| 0.0 | 0+ | 268 ms 9 % α = 100 | |||||
| 81.3 6 | (2+) | 81.3 6 | 100 | [E2] | 0.0 | 0+ | |
| 250.0 9 | (4+) | 168.7 6 | 100 | [E2] | 81.3 | (2+) | |
| 483.2 9 | (6+) | 233.3 3 | 100 | [E2] | 250.0 | (4+) | |
| 766.4 10 | (8+) | 97.5 5 283.6 4 | 100 33 100 20 | (E1) [E2] | 669.1 483.2 | (7-) (6+) | |
| 1091.6 10 | (10+) | 140.6 3 325.6 4 | 100 10 27 6 | (E1) [E2] | 950.6 766.4 | (9-) (8+) | |
| 1453.8 10 | (12+) | 171.0 4 362.2 4 | 100 30 42 15 | (E1) [E2] | 1282.8 1091.6 | (11-) (10+) | |
| 1847.0 13 | (14+) | 191? 393? | | 1656.3 1453.8 | (13-) (12+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 2 - Octupole band based on (5-). | |||||||
| 447.1 9 | (5-) | ||||||
| 669.1 10 | (7-) | 185.7 5 221.7 5 | 100 31 6.3 19 | (E1) [E2] | 483.2 447.1 | (6+) (5-) | |
| 950.6 10 | (9-) | 184.4 5 281.0 4 | 100 28 8.3 33 | (E1) [E2] | 766.4 669.1 | (8+) (7-) | |
| 1282.8 10 | (11-) | 191.1 4 332.3 4 | 100 18 16 6 | (E1) [E2] | 1091.6 950.6 | (10+) (9-) | |
| 1656.3 11 | (13-) | 202.4 4 373.6 4 | 100 16 27 8 | (E1) [E2] | 1453.8 1282.8 | (12+) (11-) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 81.3 | (2+) | 81.3 6 | [E2] | 36.9 | α=36.9 13, α(L)=26.9 9, α(M)=7.46 25, α(N)=2.03 7, α(O)=0.465 16, α(P)=0.0758 25, α(Q)=0.000250 8 | |
| 250.0 | (4+) | 168.7 6 | [E2] | 1.44 | α=1.44 3, α(K)=0.197 3, α(L)=0.904 19, α(M)=0.250 6, α(N)=0.0678 15, α(O)=0.0156 4, α(P)=0.00260 6 | |
| 447.1 | (5-) | 197.0 2 | (E1) | 0.1020 | α=0.1020, α(K)=0.0801 12, α(L)=0.01658 24, α(M)=0.00402 6, α(N)=0.001073 16, α(O)=0.000254 4 | |
| 483.2 | (6+) | 233.3 3 | [E2] | 0.429 | α=0.429, α(K)=0.1191 17, α(L)=0.227 4, α(M)=0.0621 10, α(N)=0.0169 3, α(O)=0.00390 6 | |
| 669.1 | (7-) | 185.7 5 | (E1) | 0.1172 | α=0.1172 18, α(K)=0.0917 14, α(L)=0.0192 3, α(M)=0.00466 8, α(N)=0.001243 20, α(O)=0.000294 5 | |
| (7-) | 221.7 5 | [E2] | 0.514 | α=0.514 9, α(K)=0.1303 19, α(L)=0.280 5, α(M)=0.0769 13, α(N)=0.0209 4, α(O)=0.00483 9 | ||
| 766.4 | (8+) | 97.5 5 | (E1) | 0.133 | α=0.133 3, α(L)=0.1003 20, α(M)=0.0245 5, α(N)=0.00652 13, α(O)=0.00152 3, α(P)=0.000263 5 | |
| (8+) | 283.6 4 | [E2] | 0.224 | α=0.224, α(K)=0.0833 12, α(L)=0.1033 16, α(M)=0.0281 5, α(N)=0.00761 12, α(O)=0.00177 3 | ||
| 950.6 | (9-) | 184.4 5 | (E1) | 0.1191 | α=0.1191 19, α(K)=0.0932 15, α(L)=0.0195 3, α(M)=0.00474 8, α(N)=0.001265 20, α(O)=0.000299 5 | |
| (9-) | 281.0 4 | [E2] | 0.231 | α=0.231, α(K)=0.0848 12, α(L)=0.1071 17, α(M)=0.0291 5, α(N)=0.00790 12, α(O)=0.00183 3 | ||
| 1091.6 | (10+) | 140.6 3 | (E1) | 0.226 | α=0.226, α(K)=0.174 3, α(L)=0.0388 6, α(M)=0.00945 15, α(N)=0.00252 4, α(O)=0.000593 9 | |
| (10+) | 325.6 4 | [E2] | 0.1470 | α=0.1470, α(K)=0.0643 10, α(L)=0.0607 9, α(M)=0.01638 25, α(N)=0.00444 7, α(O)=0.001034 16 | ||
| 1282.8 | (11-) | 191.1 4 | (E1) | 0.1096 | α=0.1096 17, α(K)=0.0859 13, α(L)=0.0179 3, α(M)=0.00433 7, α(N)=0.001157 18, α(O)=0.000274 4 | |
| (11-) | 332.3 4 | [E2] | 0.1385 | α=0.1385, α(K)=0.0619 9, α(L)=0.0563 9, α(M)=0.01516 23, α(N)=0.00411 6, α(O)=0.000958 14 | ||
| 1453.8 | (12+) | 171.0 4 | (E1) | 0.1422 | α=0.1422 22, α(K)=0.1109 17, α(L)=0.0236 4, α(M)=0.00573 9, α(N)=0.001529 24, α(O)=0.000361 6 | |
| (12+) | 362.2 4 | [E2] | 0.1083 | α=0.1083, α(K)=0.0526 8, α(L)=0.0410 6, α(M)=0.01098 16, α(N)=0.00298 5, α(O)=0.000695 11 | ||
| 1656.3 | (13-) | 202.4 4 | (E1) | 0.0958 | α=0.0958, α(K)=0.0753 11, α(L)=0.01551 23, α(M)=0.00376 6, α(N)=0.001003 15, α(O)=0.000238 4 | |
| (13-) | 373.6 4 | [E2] | 0.0994 | α=0.0994, α(K)=0.0496 7, α(L)=0.0366 6, α(M)=0.00980 15, α(N)=0.00266 4, α(O)=0.000620 9 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 268 ms 9 % α = 100 | Only α decay of 226U has been observed. Evaluators estimate %ε<0.05 (from gross theory, 1973Ta30), <0.0093 (from calculated half-lives of >100 s for β decay and 9.3 ms for α decay in 1997Mo25). E(level): The g.s. band. |
| 81.3 | (2+) | E(level): The g.s. band. | |
| 250.0 | (4+) | E(level): The g.s. band. | |
| 447.1 | (5-) | E(level): Octupole band based on (5-). | |
| 483.2 | (6+) | E(level): The g.s. band. | |
| 669.1 | (7-) | Magnitude of D0/Q0=5.5×10-3 11. E(level): Octupole band based on (5-). | |
| 766.4 | (8+) | Magnitude of D0/Q0=6.9×10-3 13. E(level): The g.s. band. | |
| 950.6 | (9-) | Magnitude of D0/Q0=8.7×10-3 21. E(level): Octupole band based on (5-). | |
| 1091.6 | (10+) | Magnitude of D0/Q0=10.5×10-3 12. E(level): The g.s. band. | |
| 1282.8 | (11-) | Magnitude of D0/Q0=9.0×10-3 18. E(level): Octupole band based on (5-). | |
| 1453.8 | (12+) | Magnitude of D0/Q0=8.2×10-3 17. E(level): The g.s. band. | |
| 1656.3 | (13-) | Magnitude of D0/Q0=8.6×10-3 15. E(level): Octupole band based on (5-). | |
| 1847.0 | (14+) | E(level): The g.s. band. |
1973Vi10: 226U produced and identified in 232Th(α,10N) reaction at E=140 MeV, parent of 214Rn (9040α)
1989An13: identified as parent of 222Th (7982α)
Level scheme is tentative according to 1998Gr19, but first two excited states have been verified through the detection of internal conversion electrons
Q-value: S(2n)=14527 28, S(2p)=7243 16 (2012Wa38)