ADOPTED LEVELS for 258Sg
Author: Balraj Singh | Citation: Nucl. Data Sheets 144, 297 (2017) | Cutoff date: 25-Aug-2017
Full ENSDF file | Adopted Levels (PDF version)
| S(n)= 8590 keV CA | S(p)= 2250 keV SY | Q(α)= 9620 keV SY | |||
| Reference: 2017WA10,1997MO25 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0 | 0+ | 2.5 ms +9-7 % SF = 90 10 % α ≤ 20 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | 2.5 ms +9-7 % SF = 90 10 % α ≤ 20 | Only the SF decay mode was observed by 2009Fo02 and 1997He29. No α decay was observed, with an upper limit of 20% in both 2009Fo02 and 1997He29. E(level): Only the SF decay mode was observed by 2009Fo02 and 1997He29. No α decay was observed, with an upper limit of 20% in both 2009Fo02 and 1997He29. |
1997He29 (also 1999He11): 258Sg produced in 209Bi(51V,2n), E=4.77-4.99 MeV/nucleon. Nine fission events were observed at E(51V)=4.91 MeV/nucleon, one each at 4.77 MeV/nucleon and 4.99 MeV/nucleon. The assignment to 258Sg was made on the basis of similarity of the measured excitation function to the excitation function for 208Pb(50Ti,2n) reaction.
2009Fo02: 258Sg produced in 208Pb(52Cr,2n),E=250-267 MeV at the 88-Inch Cyclotron of the Lawrence Berkeley Laboratory. Particles were detected using the Gas Separator (BGS) and a detector array consisting of 48 vertically position-sensitive strips. Measured half-life of 258Sg decay, branching ratios, and production cross sections. Total of nine SF events were detected. No α decay events were observed
Theoretical studies: consult the NSR database at www.nndc.bnl.gov for about 35 references dealing with theoretical calculations of half-lives for different decay modes, binding energies, fission characteristics, and other nuclear structure aspects.
Q-value: S(n) from 1997Mo25. S(p) and Q(α) from 2017Wa10
Q-value: Estimated uncertainties (2017Wa10): 460 for S(p), 300 for Q(α)
Q-value: S(2n)=15880 (theory,1997Mo25), S(2p)=3560 410, Q(εp)=2090 410 (syst,2017Wa10)