Using the particle-rotor model, the energy spectrum and the B（MI）/B（E2） ratio of the negative-parity yrast band in 155Tb are investigated and compared with the experimental data before and after the band-crossing....Using the particle-rotor model, the energy spectrum and the B（MI）/B（E2） ratio of the negative-parity yrast band in 155Tb are investigated and compared with the experimental data before and after the band-crossing. It is noted that before and after the band-crossing the moment of inertia of the core is a smooth function of the total angular momentum I and can be described by the ah formula. The yrast band of 155Tb with negative parity may be triaxially deformed （γ=-13°） before and an axially symmetric shape （γ=0°） after the band-crossing.展开更多
基金Supported by the National Natural Science Foundation of China under Grant! No. 19975023 by the Science Foundation of Nuclear
文摘Using the particle-rotor model, the energy spectrum and the B（MI）/B（E2） ratio of the negative-parity yrast band in 155Tb are investigated and compared with the experimental data before and after the band-crossing. It is noted that before and after the band-crossing the moment of inertia of the core is a smooth function of the total angular momentum I and can be described by the ah formula. The yrast band of 155Tb with negative parity may be triaxially deformed （γ=-13°） before and an axially symmetric shape （γ=0°） after the band-crossing.
基金US Depart ment of Energy Grants(DE-FG05-88ER40407,DE-FG02-96ER40983,DE-FG02-95ER40093)Contract(W-7405-ENG48,DE-AC03-76SF00098,DE-AC07-76ID01570)+1 种基金The Work at Tsinghua University was supported by National Natural Science Foundation of China(10575057,10775078)Major State Basic Research Development Program of China(2007CB815005)~~
