Lifetimes of High Spin Yrast States in Odd-Proton Nucleus 131Pr

• 来源期刊: 中国物理快报(英文版)
• 年，卷（期）: 2003,（4）
• 页码范围: 475-477
• 页数: 3页
• 语种: 英文

摘要

Lifetimes of the high spin yrast states in the odd-proton-nucleus 131Pr have been determined by analysing the Doppler broadened line shapes for the de-exciting γ-rays following the 116Sn(19F, 4n) 131Pr reaction at a bombarding energy of 95 MeV. The transition quadrupole moments extracted from the measured lifetimes exhibit a considerable reduction near the rotational frequency of 0.42 MeV, at which the J(1) and J(2) moments of inertia indicate a band crossing. The experimental result demonstrates occurrence of the nuclear shape change induced by band crossing associated with the alignment of a pair of h11/2 protons.