Z dependence of the N=152 deformed shell gap: In-beam γ-ray spectroscopy of neutron-rich Pu245,246
Abstract
We have measured in-beam γ rays in the neutron-rich 246Pu152 and 245Pu151 nuclei by means of Pu244(O18, O16)Pu246 and Pu244(O18, O17)Pu245 neutron transfer reactions, respectively. The γ rays emitted from Pu246 (Pu245) were identified by selecting the kinetic energy of scattered O16 (O17) detected by Si ΔE-E detectors. The ground-state band of Pu246 was established up to the 12+ state. We have found that the shell gap of N=152 is reduced in energy with decreasing atomic number by extending the systematics of the one-quasiparticle energies in N=151 nuclei into those in Pu245. This reduction of the shell gap clearly affects the 2+ energy of the ground-state band of Pu246.
- Publication:
-
Physical Review C
- Pub Date:
- December 2007
- DOI:
- 10.1103/PhysRevC.76.061301
- Bibcode:
- 2007PhRvC..76f1301M
- Keywords:
-
- 23.20.-g;
- 21.60.Ev;
- 25.70.Hi;
- 27.90.+b;
- Electromagnetic transitions;
- Collective models;
- Transfer reactions;
- 220<
- =A