ADOPTED LEVELS, GAMMAS for 258Db
Author: Balraj Singh | Citation: Nucl. Data Sheets 144, 297 (2017) | Cutoff date: 25-Aug-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-3450 keV SY | S(n)= 6480 keV SY | S(p)= 1360 keV SY | Q(α)= 9500 keV 50 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 262Bh α decay (83 MS) | B | 262Bh α decay (16 MS) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | M(γ) |
| 0.0 | A | (5+,6+) | 4.3 s 5 % ε = 23 8 % α = 77 8 | ||
| 0+X | (1-) | 1.9 s 5 % ε = 36 10 % α = 64 10 | |||
| 0+Y? | 20 s 10 % ε ≈ 100 | ||||
| 0+Z | B | ||||
| 156.5 7 | A | (4:7)(-) | 156.5 7 | (E1) | |
| 184+Z 50 | B | ||||
| 222 20 | A | ||||
| 358 30 | A | ||||
| 480 20 | A | ||||
| 561+Z 50 | B |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (5+,6+) | 4.3 s 5 % ε = 23 8 % α = 77 8 | ε decay to excited states including two newly-proposed isomeric states in 258Rf (2016He15). |
| 0+X | (1-) | 1.9 s 5 % ε = 36 10 % α = 64 10 | ε decay to g.s. and probable low-lying states in 258Rf (2016He15). |
| 0+Y | 20 s 10 % ε ≈ 100 | Existence of this isomer has not been established. E(level): Existence of this isomer has not been established. | |
| 358 | α 38.9γ observed by 2009He20 in coin with 9810α groups. | ||
| 480 | α 38.9γ observed by 2009He20 in coin with 9671α groups. | ||
| 561+Z | α 102.4 5 γ observed by 2009He20 in coin with 9826α group. |
| E(level) | E(gamma) | Comments |
| 156.5 | 156.5 | M(γ): possible E1, estimated from number of observed αγ coincidences |
1984Og03: 258Db produced and identified in 208Bi(50Ti,n) and parent of 258Rf activity.
1985He22: 258Db produced in 208Bi(50Ti,n), and identified as parent of 254No, 254Lr, 250Fm, and 250Md through αα correlations, measured half-lives.
2001Ga20: 258Db produced in 241Am(22Ne,5n), measured half-lives
2008Ga25: 258Db produced in 208Pb(51V,n),(50Ti,n) reactions at E=4.7-5.1 MeV/nucleon, with beams of 51V (11+ charge state) and 50Ti (12+ charge state) provided by 88-Inch Cyclotron at LBNL. Separated and detected charged particles using BGS focal plane detector and a multiwire proportional counter. Measured Eα, Iα and half-life of 258Db decay using silicon implantation detectors.
2016He15: 258Db produced in 209Bi(50Ti,n),E=236 MeV, with 50Ti beam from the ECR source of the UNILAC at GSI. The Evaporation residues (ERs) were separated by the velocity filter SHIP and implanted into a position-sensitive 16-strip Si PIPS detector for detecting ERs, conversion electrons, and subsequent α-decays or spontaneous fission (SF) events. Escaped products into the backward hemisphere were detected by a box of six Si wafers. The x rays were detected by a Ge clover detector consisting of four crystals. Measured correlations between ERs, x rays, ce, α-decay and SF events. Deduced isomeric states and half-lives.
Theoretical studies: consult the NSR database at www.nndc.bnl.gov for about 40 references dealing with theoretical calculations of half-lives for different decay modes, binding energies, fission characteristics, and other nuclear structure aspects.
Q-value: Estimated uncertainties (2017Wa10): 510 for Q(β-), 370 for S(n), 310 for S(p)
Q-value: S(2n)=14840 390, S(2p)=4530 320, Q(εp)=1840 310 (syst,2017Wa10)