CAJ | 학술논문

利用在束γ谱学方法,通过反应144Sm(16O,3n)157Yb研究了157Yb的激发态能级结构. 实验中使用的16O束流能量为90MeV. 基于实验得到的γ-γ符合关系、γ射线的各向异性度和DCO系数,建议了157Yb的高自旋能级纲图. 157Yb的能级纲图主要由两串跃迁性质明显不同的级联能级组成,它们分别对应于νi13/2转动带和单粒子激发态. 着重讨论了157Yb的形状共存和νi13/2转动带随角动量的结构演化.
이용재속γ보학방법,통과반응144Sm(16O,3n)157Yb연구료157Yb적격발태능급결구. 실험중사용적16O속류능량위90MeV. 기우실험득도적γ-γ부합관계、γ사선적각향이성도화DCO계수,건의료157Yb적고자선능급강도. 157Yb적능급강도주요유량천약천성질명현불동적급련능급조성,타문분별대응우νi13/2전동대화단입자격발태. 착중토론료157Yb적형상공존화νi13/2전동대수각동량적결구연화.
The excited states of 157Yb have been studied in the 144Sm(16O,3n) reaction at 16O energy of 90MeV using techniques of in-beam γ-ray spectroscopy. The level scheme for 157Yb was established based on the measured results of γ-γ coincidences,γ-ray anisotropies and DCO ratios. The level scheme is dominated by two parallel de-exciting sequences with different characteristics,which correspond to collective rotation and single particle excitations,respectively. This shape co-existence,as well as the structural evolution of the yrast νi13/2 band with increasing angular momentum,have been discussed briefly.