Shape coexistence and isomeric states in neutron-rich Tc112 and Tc113
Abstract
Isomeric states in Tc112 and Tc113, with half-lives of 150(17) ns and 500(100) ns, respectively, have been observed following the relativistic fission of U238. The fission fragments have been separated in a fragment separator and identified by means of energy-loss and time-of-flight techniques. In both nuclei, the ground-state configuration is calculated to have an oblate shape and the isomerism is proposed to arise due to transitions from a triaxial excited state to a low-lying oblate state.
- Publication:
-
Physical Review C
- Pub Date:
- October 2010
- DOI:
- 10.1103/PhysRevC.82.044312
- Bibcode:
- 2010PhRvC..82d4312B
- Keywords:
-
- 21.10.Tg;
- 23.20.Lv;
- 23.35.+g;
- 27.60.+j;
- Lifetimes;
- gamma transitions and level energies;
- Isomer decay;
- 90<
- =A<
- =149