ADOPTED LEVELS for 258No
Author: Balraj Singh | Citation: Nucl. Data Sheets 144, 297 (2017) | Cutoff date: 25-Aug-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-3300 keV SY | S(n)= 6840 keV SY | S(p)= 4800 keV SY | Q(α)= 8150 keV SY | ||
| Reference: 2017WA10 |
| References: | |||
| A | 258Md β- decay (57.0 M):? | B | 258Lr ε decay (3.92 S) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0 | 0+ | 1.2 ms 2 % SF ≈ 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | 1.2 ms 2 % SF ≈ 100 | Only the SF decay mode has been observed. Symmetric mass distribution was observed in SF, and total kinetic energy of fission fragments were measured by 1986Hu01 and 1989Hu09. E(level): Only the SF decay mode has been observed. Symmetric mass distribution was observed in SF, and total kinetic energy of fission fragments were measured by 1986Hu01 and 1989Hu09. |
258No produced and identified by 1969NuZZ in 248Cm(13C,X) reaction, followed by measurement of α decay, Eα and half-life
1986Hu01, 1989Hu09: 248Cm(13C,X)258No,E=81 MeV; measured fission fragment mass distribution, kinetic energy partitioning from SF decay of 258No
1985Tu01: 238U(20Ne,F),E=292 MeV; measured (fragment)(fragment)(θ), (fragment)(fragment)(|f); deduced linear momentum transfer for 258No compound nucleus.
2009Pe09: 232Th(26Mg,F),E=148 MeV; measured σ, mass and energy distributions of fission fragments, neutrons by time-of-flight method; deduced ratio of widths for neutron emission and fission (Γn/ΓF) for the compound nucleus of 258No
While the half-life of 262Rf does not seem confirmed as yet (most recent value being 17 ms 16 from 2013Mu08 as opposed to 210 ms +128-58 by α. Gorshkov et al. in 2008 GSI annual Sci. Rep. p140 (2009); 2.5 s +24-16 in 1998Tu01; 2.1 s 2 in 1996La11; 1.2 s +10-5 in 1994La22; 1.3 s +16-8 in 1994Og04; 47 ms 5 in 1985So03), it is quite definite that 262Rf decays primarily by SF mode. No evidence has been found for α decay mode of 262Rf
Theoretical studies: consult the NSR database at www.nndc.bnl.gov for about 85 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): 140 for Q(β-), 100 for S(n), S(p) and Q(α),
Q-value: S(2n)=12490 100, S(2p)=8590 100 (syst,2017Wa10)