Akiyoshi Yamazaki

High-Spin States in 93Nb

The high-spin states of 93 Nb are studied by the 82 Se( 16 O, p4n) 93 Nb reaction at a beam energy of 100 MeV. The in-beam γ-ray spectroscopic techniques are used. The γt-, γγt-coincidence, γ-ray a...

CHIRALITY IN THE MASS 80 REGION: 79Kr

The high spin states of 79Kr were studied via the 70Zn(13C, 4n) reaction to search for chiral doublet bands based on the three-quasi-particle configuration, πg9/22 ⊗ νg9/2-1. The 13C beam of 65 MeV was provided by the 930 AVF Cyclotron at CYclotron and RadioIsotope Center (CYRIC) facility at Tohoku University. The triple coincidence γ rays were detected by the Hyperball2 array. The side band structure to the πg9/22 ⊗ νg9/2-1 yrast band has been identified in 79Kr. Spin and parity assignments are made based on the DCO ratio and linear polarization analysis.

Design of an all-permanent-magnet ECR ion source at the Cyclotron and Radioisotope Center

A new electron cyclotron resonance ion source has been designed and equipped with the new cyclotron at the Cyclotron and Radioisotope Center, Tohoku University. The ion source consists of a full permanent-magnet system with a microwave frequency of 14.5 GHz. The source has the following three main features: (1) V-style magnetization, (2) flat-bottomed magnetic-field distribution, and (3) field adjusting system. The measured magnetic-field strength in the plasma chamber is about 8% weaker than the calculated value. The extracted beam current is measured as the preliminary result.