The experiment populated the excitation state of 64cu via 64ni ( p , ny ) 64cu * reaction and the lifetime of low - lying excitation state of 64cu were determined via the delayed coincidence method between pulse proton beam and de - excitation y rays detected by ge ( li ) detector Sns )與ge ( l )探測器測量退激y射線延遲符合的方法,由時間譜tof峰的中值移動的方法來確定激發(fā)態(tài)壽命。