Lifetime Measurement of the Low Lying Yrast States in 189Pt

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（11）
• 页码范围: 68-70
• 页数: 3页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/11/112101

摘要

High-spin states in 189Pt are populated through the heavy-ion fusion-evaporation reaction 176 Yb (18O,5n)189 Pt at 87 MeV beam energy.An array consisting of 13 HPGe detectors is used in conjunction with the plunger device in CIAE.The lifetimes of two levels in the yrast band are determined by using the recoil distance Doppler shift method.The transition quadrupole moments Qt are extracted.The results show that the 17/2+ state has a much larger Qt value than that of the ground state,whereas the value deceases quickly with spin increasing.This may contribute to the shape driving effect of the quasi-neutron from the i13/2 orbital.