Takaharu Otsuka

A microscopic approach to a foundation of the Interacting Boson Model by using angular momentum projection

Abstract A microscopic approach related to a foundation of the Interacting Boson Model was carried out by taking a model hamiltonian and using angular momentum projection. It is shown in this particular model that the inclusion of the hexadecapole degree of freedom in addition to the monopole and quadrupole degrees of freedom is important and sufficient to reproduce physical quantities.

Description of high-spin states in the interacting boson model

Abstract The proton-neutron interacting boson model is extended so that states with two fermions are included. This model is applied to the description of high-spin states of the Ba and Ce isotopes. The backbending phenomenon is well explained.

M1 transitions between low-lying levels in 168Er and F-spin purity☆

Abstract Magnetic transitions in the gamma band of the nucleus 168Er have been calculated with the proton-neutron interacting boson model. The F-spin purity is found to be better than 96%.

Pre-equilibrium description of fast light particle emission in heavy-ion reactions

Abstract Fast light particle emissions in heavy-ion reactions are described as a pre-equilibrium process. Reactions between a “light” heavy-ion projectile and a heavy target are considered in the energy region of the incident energy / the projectile mass ⪅ 10 MeV. Calculations are carried out by an extended exciton model in which the finiteness of the time needed for the fusion process is included. The spectrum shapes of proton, alpha, deuteron and triton emissions are well explained for an example case, 14 N + 181 Ta at 115 MeV .

Low-lying Structures Of Exotic Sc Isotopes And The Evolution Of The N=34 Subshell Closure

Recent investigations of exotic nuclei with

Microscopically derived interacting boson model

N=32

A Shell Model Study of the Proton-Neutron Interacting Boson Model

and

Equivalence between gamma instability and rigid triaxiality in finite boson systems.

34

SHELL-MODEL EVIDENCE FOR THE EXCHANGE TERM IN THE INTERACTING-BOSON-FERMION HAMILTONIAN

have highlighted the presence of sizable subshell closures at these neutron numbers that are absent in stable isotones. Indeed, the development of the shell gap at

Shell Model Analysis of the

N=32