ADOPTED LEVELS for 256Lr
Author: Balraj Singh | Citation: Nucl. Data Sheets 141, 327 (2017) | Cutoff date: 22-Mar-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-2480 keV 80 | S(n)= 6270 keV 80 | S(p)= 2350 keV 80 | Q(α)= 8810 keV SY | ||
| Reference: 2017WA10 |
| References: | |||
| A | 260Db α decay (1.52 S) | ||
| E(level) (keV) | XREF | T1/2(level) |
| 0.0 | 27.9 s 10 % ε ≈ 15 10 % α ≈ 85 10 % SF < 0.03 | |
| 236 44 | A | |
| 282 42 | A | |
| 317 42 | A |
E(level): From 260Db α decay, deduced from measured α energies in 260Db α decay and Q(α)(260Db)=9500 40 (syst,2017Wa10)
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 27.9 s 10 % ε ≈ 15 10 % α ≈ 85 10 % SF < 0.03 | The α decay/ε decay ratio has been estimated approximately only. The authors of 1968Fl08 deduced the ε branch as about 30%, if the 8.42-MeV α group in their spectrum is from the ε decay daughter, 256No. Presumably, the 8.43-MeV α of 256Lr was not considered; therefore, this branching should be an upper limit. In authors’ other paper, 1968Fl01, the authors stated that it was impossible to determine the branching from their data. The authors of 1971Es01 set an upper limit of 20% for an ε branch. It was established by 1976BeZY that 256Lr does decay by electron capture; however, its branching was not determined. %ε=15 10, %α=85 10 is recommended here. E(level): The α decay/ε decay ratio has been estimated approximately only. The authors of 1968Fl08 deduced the ε branch as about 30%, if the 8.42-MeV α group in their spectrum is from the ε decay daughter, 256No. Presumably, the 8.43-MeV α of 256Lr was not considered; therefore, this branching should be an upper limit. In authors’ other paper, 1968Fl01, the authors stated that it was impossible to determine the branching from their data. The authors of 1971Es01 set an upper limit of 20% for an ε branch. It was established by 1976BeZY that 256Lr does decay by electron capture; however, its branching was not determined. %ε=15 10, %α=85 10 is recommended here. |
No new experimental references since the 2017 update (2017Si08) of 256Lr. In the present update, an incorrect reference 2014Sa01 for the half-life of the g.s. of 256Lr has been corrected to 2014Sa21, and some other very minor changes have been made.
1965Do10: 256Lr produced and identified in 243Am(18O,5n), E=96 MeV reaction, followed by the measurement of an α-decay chain, and half-life.
Later studies of 256Lr decay: 1968Fl08, 1970Dr08, 1971Es01, 1976BeZY, 2008An16, 2014Sa21.
2012Mi27: mass measurement by time-of-flight ion-cyclotron-resonance method using SHIPTRAP at GSI.
Theoretical calculations: consult the Nuclear Science References (NSR) database for 33 primary references, mostly dealing with half-life in α decay and cluster decays.
Q-value: Estimated uncertainty=100 for Q(α) (2017Wa10)
Q-value: S(2n)=14270 310, S(2p)=6280 130 (syst,2017Wa10)