Speaker
Mr
Nobuo HINOHARA
(Kyoto University)
Description
We have investigated the oblate-prolate shape coexistence/mixing
phenomena in proton-rich nuclei around 68Se and 72Kr
by means of the adiabatic self-consistent collective coordinate
(ASCC) method.
For 68Se and 72Kr, it is shown that the collective path extracted
from the TDHFB phase space of large dimensions runs approximately
along the valley that exists in the triaxially deformed region
and connects the oblate and prolate local minima in the collective
potential energy surface.
On the basis of the ASCC method, we have derived the quantum
collective Hamiltonian which describes the coupled collective motion
of the large-amplitude vibration responsible for the oblate-prolate
shape mixing and the three-dimensional rotation of the triaxial shape.
The calculation produces the oblate ground-state band and
the excited prolate band.
The basic pattern of shape coexistence/mixing phenomena is reproduced
using the one-dimensional collective path in the two-dimensional
beta-gamma plane. It is also shown that the shape mixing decreases
as the angular momentum increases.
Preliminary results of ASCC calculation for low-lying states of
N=Z nuclei, such as the triaxial nucleus 64Ge and the
spherical-oblate-prolate shape coexisting nucleus 80Zr,
and the transitional nuclei around 100Mo will also be presented.
Primary author
Mr
Nobuo HINOHARA
(Kyoto University)
Co-authors
Prof.
Kenichi MATSUYANAGI
(Kyoto University)
Prof.
Masayuki MATSUO
(Niigata University)
Prof.
Takashi NAKATSUKASA
(RIKEN Nishina Center)
