Speaker
Dr
Koichi Sato
(RIKEN Nishina Center)
Description
We study the development of deformation in low-lying states of neutron-rich Cr isotopes around N=40, where recent experiments suggest the development of deformation. Recently, we have developed a method for determining microscopically the five-dimensional quadrupole collective Hamiltonian, which is a standard tool to describe the quadrupole collective motions. This method consists of the constrained Hartree-Fock-Bogoliubov (HFB) equation and the local QRPA (LQRPA) equations, which is an extension of the usual QRPA (quasiparticle random phase approximation) to non-HFB-equilibrium points, on top of the CHFB states. Therefore, we call this method the CHFB+LQRPA method. The collective Hamiltonian has seven quantities to be determined microscopically: three vibrational and three rotational inertial functions, and the collective potential. One of the advantages of our method is that the inertial functions calculated with this method contain the contributions of the time-odd components of the mean field, which are ignored in the widely-used cranking formula. We have applied the CHFB + LQRPA method to shape phase transition in neutron-rich Cr isotopes. The results of our calculation are in good agreement with available experimental data and suggest the development of quadrupole deformation around N=40.
Primary author
Dr
Koichi Sato
(RIKEN Nishina Center)
Co-authors
Dr
Kenichi Matsuyanagi
(RIKEN Nishina Center)
Prof.
Masayuki Matsuo
(Niigata University)
Dr
Nobuo Hinohara
(RIKEN Nishina Center)
Dr
Takashi Nakatsukasa
(RIKEN Nishina Center)
