ADOPTED LEVELS, GAMMAS for 257Db
Authors: E. Browne, J. K. Tuli | Citation: Nucl. Data Sheets 114, 1041 (2013) | Cutoff date: 1-Mar-2012
Full ENSDF file | Adopted Levels (PDF version)
| S(n)= 8362 keV SY | S(p)= 1303 keV SY | Q(α)= 9206 keV 20 | |||
| Reference: 2012WA38 |
| References: | |||
| A | 261Bh α decay | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | M(γ) | Final Levels | |
| 0.0 | A | (9/2+) | 2.3 s 2 % α ≥ 94 % SF ≤ 6 | ||||
| ≈250 | A | (7/2-) | |||||
| ≈370 | A | (1/2-) | 0.67 s 6 % α ≥ 87 % SF ≤ 13 | ||||
| ≈470 | A | [3/2-] | ≈100S | 370 | (1/2-) | ||
| ≈600 | A | (5/2-) | ≈160S ≈230S ≈350S | [M1] [E2] [M1] | 470 370 250 | [3/2-] (1/2-) (7/2-) | |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (9/2+) | 2.3 s 2 % α ≥ 94 % SF ≤ 6 | Emitted α particles: 9063 keV 20, 8956 keV 20 (2010He11); 9066 keV 20, 8965 keV 20, 8874 keV 20? (2009He20); 9074 keV 10, 8967 keV 15 (2001He35). Others: 1999He07, 1986He28, 1985He22. E(level): Emitted α particles: 9063 keV 20, 8956 keV 20 (2010He11); 9066 keV 20, 8965 keV 20, 8874 keV 20? (2009He20); 9074 keV 10, 8967 keV 15 (2001He35). Others: 1999He07, 1986He28, 1985He22. %α, %SF, %ε+%β+: 1999He11, 2001He35 determined %SF|<6 for presumably combined decay of two isomers. 1985He22, 1986He28, 2000Ho27 determined %α=83 11 and %SF=17 11 for the combined decay of the 2.3 s and 0.67 s isomers. %SF≈20 (1976Og02) From log ft≈6 and Q(ε)≈4500 T1/2(ε+β+)≈200 s. Therefore, %ε+%β+ is expected to be small. |
| 370 | (1/2-) | 0.67 s 6 % α ≥ 87 % SF ≤ 13 | Emitted α particles: 9168 keV 20 (2010He11); 9155 keV 20 (2009He20); 9163 keV 10 (2001He35). Others: 1999He07, 1986He28, 1985He22. E(level): Emitted α particles: 9168 keV 20 (2010He11); 9155 keV 20 (2009He20); 9163 keV 10 (2001He35). Others: 1999He07, 1986He28, 1985He22. |
| 600 | (5/2-) | Emitted α particles: 10000 keV (Iα=100%)(2010He11). E(level): Emitted α particles: 10000 keV (Iα=100%)(2010He11). |
Calculations, compilations:
Calculated T1/2: 2012Po01, 2011Qi12, 2011He12, 2010Do08, 2010Sa36, 2010Si27.
Favored α decay: 1993Bu09
g.s. properties: 1997Mo25, 1995Mo29
Calculated Q(α): 2011Sa40, 2010Ad19, 2009Do22, 2008Do12, 2008Ro06, 2007Zh41.
Single-particle Nilsson levels: 2004Pa40, 2004HeZZ, 1994Cw02.
1994Cw02 calculate the following single-particle Nilsson level sequence: g.s., 9/2[624]; 0.23 MeV, 7/2[514]; 0.29 MeV, 5/2[512]; 0.46 MeV, 1/2[521].
Spontaneous fission: 2004Pe23.
Assignment: 209Bi(50Ti,2n), parent of 253Lr (1985He22,1986He28,2001He35,2008Ga25), measured σ (2012Ca06,2005Zu02,2004Ad32). 236U(27Al,6n), parent of 253Lr (1992An16)
The 5-s activity assigned to 257Db by 1976Og02 was reassigned to 258Rf and 258Db by 1986He28
Q-value: ΔS(n)=314, ΔS(p)=204 (2012Wa38)