ADOPTED LEVELS, GAMMAS for 266Hs
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 15-Dec-2021
Author: Balraj Singh | Citation: Nucl. Data Sheets 156, 70 (2019) | Cutoff date: 31-Jan-2019
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-653×101 keV 10 | S(n)= 7830 keV 40 | S(p)= 2540 keV SY | Q(α)= 10346 keV 16 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 270Ds α decay (0.20 MS) | B | 270Ds α decay (3.9 MS) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | Final Levels | |
| 0 | A | 0+ | 2.97 ms +78-51 % α = 76 9 % SF = 24 9 | |||
| ≈85 | B | |||||
| ≈712 | B | |||||
| ≈930 | B | 218 | 712 | |||
| ≈1200 | B | 0.07 s +36-3 % α ≈ 100 | ||||
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | 2.97 ms +78-51 % α = 76 9 % SF = 24 9 | SF branch from a larger number of decay chains observed in 2012Ac04, but complete analysis of these results is not available as yet. Other: fission branch estimated as within 1.4% in the absence of observed SF for this nucleus (2001Ho06). E(level): SF branch from a larger number of decay chains observed in 2012Ac04, but complete analysis of these results is not available as yet. Other: fission branch estimated as within 1.4% in the absence of observed SF for this nucleus (2001Ho06). |
| E(level) | E(gamma) | Comments |
2001Ho06 (also 2002Ho11, 2011Ac01, 2015Mu16 review): 266Hs produced as α daughter of 270Ds, which was formed in 207Pb(64Ni,n),E=317 MeV using UNILAC accelerator facility and SHIP separator at GSI. Experiments performed under an international collaboration between laboratories in Germany, Slovakia, Poland, and Russia. Of the eight correlated events detected, six events involved EVR-α1-α2-SF correlations, and two EVR-α2-SF. Two groups for the six α-decays assigned to 270Ds as follows: events #1, #2, and #3 belonged to the g.s., and events #4, #5, and #6 to states originating from a K-isomer (as in the case of the longest half-life in event #6) or γ-decay. No fission event was observed which could have been assigned to 266Hs. See details for 270Ds Adopted Levels for history of eight decay chains assigned to 270Ds |) 266Mt α-α sequence. 2001Ho06 considered the possibility of existence of an isomeric state, analogous to the one in 270Ds.
2012Ac04: 25 additional decay chains were observed at GSI using the same reaction and SHIP separator as in 2001Ho06. These chains were of three different types of correlations: EVR-α-α-SF, EVR-α-SF, and EVR-α-α-α-SF. Complete analysis of these data are yet to be published as mentioned in author’s review articles 2017Ac02 and 2015Ac04. Revised half-life of 270Ds α decay was deduced in this work. These experiments are also briefly described by d. Ackermann et al., in GSI Annual Scientific reports (GSI-2010, p200 (published in 2011), and GSI-2011, p208 (published in 2012)). Isomeric state in 266Hs is proposed in these studies
For theoretical studies, consult Nuclear Science References (NSR) database at NNDC, BNL for 136 primary references dealing with the half-lives and other aspects of nuclear structure in this mass region
Q-value: Estimated uncertainty for S(p)=240 (2021Wa16)
Q-value: S(2n)=14570 40, S(2p)=4220 280 (syst), Q(εp)=1060 140 (syst), Q(ε)=3040 170 (syst) (2021Wa16)