利用束流能量为 116MeV的59Co(35Cl,2p2n) 90 Mo反应布居90 Mo的高自旋态 .用 10台反康普顿HPGe探测器组成的探测阵列进行γ γ符合测量 .通过多普勒展宽峰的形状分析测定90 Mo高自旋态的寿命 .在正宇称衰变系观察到增强的M1跃迁 ,推断I =13以上是扁椭形变 .负宇称高自旋态具有大的B(E2 )值 ,并随自旋增大而起伏变化 .正、负宇称态之间的跃迁显示增大的E1跃迁 ,似有八极关联的可能 .但是 ,90 Mo并不处在理论预言的存在八极形变的核区内 The high-spin state of 90 Mo was dominated by the 59 Co (35Cl, 2p2n) 90 Mo reaction with a beam energy of 116 MeV.The detection array of 10 anti-Compton HPGe detectors was used to make the γ-γ coincidence measurement.Doppler broadening peak The shape transition of the 90 Mo high spin state is measured by the analysis of the enhanced M1 transitions in the positive parity decay system, which is presumed to be flat elliptic deformation above I = 13. The negative parity high spin state has a large B (E2) Spin increases and fluctuates, and the transition between positive and negative parity shows that the increased E1 transition may appear octupolely related.However, 90 Mo is not in the theoretical prediction of octupole degeneration Area