ADOPTED LEVELS, GAMMAS for 276Mt
Author: Balraj Singh | Citation: Nucl. Data Sheets 156, 148 (2019) | Cutoff date: 31-Jan-2019
Full ENSDF file | Adopted Levels (PDF version)
| S(n)= 5590 keV SY | S(p)= 2590 keV SY | Q(α)= 10100 keV 9 | |||
| Reference: 2017WA10 |
| References: | |||
| A | 280Rg α decay (4.4 S) | ||
| E(level) (keV) | XREF | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A | 0.69 s +9-7 % α ≈ 100 | |||||
| 0+X? | 4 s +5-1 % α ≈ 100 | ||||||
| 194 1 | A | 194 1 | 100 | (E1) | 0.0 | ||
| 237.4 5 | A | 237.4 5 | 100 | (E1) | 0.0 | ||
| 279.6 22 ? | A | 279.6 22 ? | 100 | [E1] | 0.0 | ||
| 731.6 14 ? | A | 494.2 13 ? | 100 | [E2] | 237.4 | ||
E(level): From Eγ data
| E(level) (keV) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 194 | 194 1 | (E1) | 0.1391 | α=0.1391 | |
| 237.4 | 237.4 5 | (E1) | 0.0926 | α=0.0926 | |
| 279.6 | 279.6 22 | [E1] | 0.0670 | α=0.0670 | |
| 731.6 | 494.2 13 | [E2] | 0.1448 | α=0.1448 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0.69 s +9-7 % α ≈ 100 | Only the α decay mode has been observed. E(level): Only the α decay mode has been observed. | |
| 0+X | 4 s +5-1 % α ≈ 100 | Assignment of this isomer to 276Mt in 2012Og02 and 2013Og01 is based on a wide structure of the α-decay curves, showing two peaks: 9.26 MeV 64 and 9.81 MeV 8, the partial half-lives of the higher energy peak about 10 times higher than that for the rest of the decays. However, according to 2013Ru11, this isomer could be assigned to 280Rg or 272Bh. |
The 276Mt nuclide is produced in about 100 (or 113) correlated decay chains observed at Dubna, GSI and Berkeley, starting from 288Mc and ending in 268Db, which decays by SF. Main references for production of 288Mc: 2004Og03, 2005Og02, 2005Dm03, 2012Og02, 2013Ru11, 2015Ru11, 2013Og01, 2015Ga24, 2016Fo10. See 288Mc Adopted Levels for details.
2012Og02 and 2013Og01 proposed an isomer in 276Mt with a half-life of about 6 s, but it has not been confirmed in the work of 2013Ru11 (Also 2016Fo10). 2013Ru11 suggest that the isomer could be equally associated with 280Rg or 272Bh
For theoretical studies, consult Nuclear Science References (NSR) database at NNDC, BNL for 56 primary references dealing with the half-lives and other aspects of nuclear structure in this mass region
Data for excited states and gamma rays are from 280Rg α decay based on studies by 2013Ru11 (at GSI) and 2015Ga24 (at Berkeley)
Q-value: Estimated uncertainties (2017Wa10): ΔS(n)=680, ΔS(p)=790.
Q-value: S(2n)=12070 640, S(2p)=6950 820 (syst,2017Wa10)