ADOPTED LEVELS for 270Db
Author: Balraj Singh | Citation: Nucl. Data Sheets 156, 70 (2019) | Cutoff date: 31-Jan-2019
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=820 keV SY | S(n)= 4910 keV SY | S(p)= 4230 keV CA | Q(α)= 8260 keV SY | ||
| Reference: 2017WA10,1997MO25 |
| References: | |||
| A | 274Bh α decay (44 S) | ||
| E(level) (keV) | XREF | T1/2(level) |
| 0 | A | 15 h +10-4 % α = ? % SF ≈ 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 15 h +10-4 % α = ? % SF ≈ 100 | By combining the data from Dubna work (2013Og04,2011Og04), 2014Kh04 assigned α decay of 270Db to five decay chains to α decay and only one decay chain to SF decay, based on which the authors assigned ≈17% decay branch to SF decay mode, which is in disagreement with the Dubna work (2013Og04, 2011Og04 and 2015Og05, 2017Og01 reviews) where dominant decay mode is assigned as SF decay, while not excluding α or ε decay mode entirely. See detailed discussion in section IV of 2013Og04, where comparison is made between decay modes of 270Db and 268Db, with a conclusion that α decay mode of 270Db is unlikely. E(level): By combining the data from Dubna work (2013Og04,2011Og04), 2014Kh04 assigned α decay of 270Db to five decay chains to α decay and only one decay chain to SF decay, based on which the authors assigned ≈17% decay branch to SF decay mode, which is in disagreement with the Dubna work (2013Og04, 2011Og04 and 2015Og05, 2017Og01 reviews) where dominant decay mode is assigned as SF decay, while not excluding α or ε decay mode entirely. See detailed discussion in section IV of 2013Og04, where comparison is made between decay modes of 270Db and 268Db, with a conclusion that α decay mode of 270Db is unlikely. |
2010Og01, 2011Og04: 274Bh from α decay chain: 294Ts |) 290Mc |) 286Nh |) 282Rg |) 278Mt |) 274Bh |) 270Db, 294Ts formed and identified in reaction 249Bk(48Ca,3n), E=247 MeV at FLNR-JINR-Dubna using Dubna gas-filled recoil separator (DGFRS). Measured Eα, half-lives, α-α correlations. One decay chain was assigned to the decay of 294Ts. See details in 294Ts Adopted Levels.
2012Og06, 2013Og04, 2013Og01: 274Bh formed in the decay chain of 294Ts as above in 2011Og04. See details in 294Ts Adopted Levels. Two decay chains were reported.
2014Kh04: 274Bh from α decay chain: 294Ts |) 290Mc |) 286Nh |) 282Rg |) 278Mt |) 274Bh |) 270Db; 294Ts formed and identified in reaction 249Bk(48Ca,3n),E=252.1, 254.0, 258.0 MeV at GSI using Gas-filled Trans-Actinide Separator and Chemistry Apparatus (TASCA). Four decay chains were assigned to the decay of 294Ts, but only two were reported in 2014Kh04, while the other two were relegated to a future detailed publication as per reference 36 in the paper, however no further publication seems to have appeared since the 2014Kh04 paper. See details for 294Ts Adopted Levels.
One EVR-α-SF correlated decay chain reported by 2011Og04, three by 2013Og04 and 2012Og06, and two by 2014Kh04, all starting with the decay of 294Ts and ending in SF-decaying 270Db nuclide in Dubna work (2013Og04, 2011Og04) and in SF-decaying 266Lr in GSI work (2014Kh04). 2011Og07 and 2012OgZZ are also related reports for the Dubna work. See Adopted Levels for 294Ts for details of above three studies.
For theoretical studies, consult Nuclear Science References (NSR) database at NNDC, BNL for 47 primary references dealing with the half-lives and other aspects of nuclear structure in this mass region
Q-value: Estimated uncertainties (2017Wa10): ΔQ(β-)=830, ΔS(n)=880, ΔQ(α)=200.
Q-value: S(p) from theory (1997Mo25); other values from 2017Wa10
Q-value: S(2n)=10900 810 (syst, 2017Wa10). S(2p)=10250 (1997Mo25, theory)