ADOPTED LEVELS for 260Db
Author: Y. A. Akovali | Citation: Nucl. Data Sheets 87, 301 (1999) | Cutoff date: 1-Oct-1998
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-2.88×103 keV SY | S(n)= 6.39×103 keV SY | S(p)= 1.98×103 keV SY | Q(α)= 9.50×103 keV SY | ||
Reference: 2012WA38 |
References: | |||
A | 264Bh α decay |
E(level) (keV) | XREF | T1/2(level) |
0.0 | 1.52 s 13 % α ≥ 90.4 6 % ε < 2.5 % SF ≤ 9.6 6 | |
≈200 | A | |
≈346 | A |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | 1.52 s 13 % α ≥ 90.4 6 % ε < 2.5 % SF ≤ 9.6 6 | From α counts and spontaneous-fission events, 1977Be36 obtained %α=90.4 6, %SF=9.6 6. Most of the interfering longer-lived SF events were subtracted. Because of some uncertainty in SF events’ origin, as pointed out by 1977Be36, this SF branching should be considered an upper limit (following α and ε decays, the granddaughter 256No also decays by spontaneous fission; if 260Db ε decays, then the observed SF events are expected to include contributions from the SF decay of 260Rf, too). The upper limit for ε decay was determined by 1977Be36 from absence of Lawrencium x-rays in their spectrum. Other measurements: %SF<20, %ε<20 (1970Gh02). E(level): From α counts and spontaneous-fission events, 1977Be36 obtained %α=90.4 6, %SF=9.6 6. Most of the interfering longer-lived SF events were subtracted. Because of some uncertainty in SF events’ origin, as pointed out by 1977Be36, this SF branching should be considered an upper limit (following α and ε decays, the granddaughter 256No also decays by spontaneous fission; if 260Db ε decays, then the observed SF events are expected to include contributions from the SF decay of 260Rf, too). The upper limit for ε decay was determined by 1977Be36 from absence of Lawrencium x-rays in their spectrum. Other measurements: %SF<20, %ε<20 (1970Gh02). |