Abstract
The rotational properties of the neutron-rich Nd and Sm isotopes with mass number are systematically investigated by using the cranked shell model with pairing correlations treated by a particle-number conserving method, in which the Pauli blocking effects are taken into account exactly. The two-quasiparticle states in even-even Nd and Sm isotopes with excitation energies lower than 2.5 MeV are systematically calculated. The available data can be well reproduced and some possible two- and four-quasiparticle isomers are also suggested for future experiments. The experimentally observed rotational frequency variations of moments of inertia for the even-even and odd- nuclei are reproduced very well by the calculations. The effects of high-order deformation on the two-quasiparticle excitation energies and moments of inertia of the ground-state bands in even-even Nd and Sm isotopes are analyzed in detail. By analyzing the occupation probability of each cranked Nilsson orbitals near the Fermi surface and the contribution of each major shell to the angular-momentum alignments, the alignment mechanism in these nuclei is understood clearly.
1 More- Received 29 April 2018
- Revised 25 June 2018
DOI:https://doi.org/10.1103/PhysRevC.98.034304
©2018 American Physical Society