合成和研究滴线区新核素β延发质子先驱核~(121)Ce

Abstract

利用￣（３２）Ｓ束轰击￣（９２）Ｍｏ靶，熔合蒸发３ｎ反应合成了￣（１２１）Ｃｅ．藉助于具有γ（Ｘ）－ｐ－ｔ符合测量的氦喷嘴反冲快速带传输系统进行分离和鉴别．实验定出￣（１２１）Ｃｅ的半衰期为（１．１±０．１）ｓ，观测到了￣（１２１）Ｃｅ的延发质子谱并近似估计了延发质子分支比为（１．０±０．５）％．New β-delayed proton precursor 121Ce has been produced by the reaction 92Mo(32S,3n)and studied by using γ(X)-p coincidence with a He-Jet recoil fast tape transportsystem. The half-life of 121Ce was determined to be(1.1±0.1)s. Its β-delayed protonspectrum has been observed and the β-delayed proton branching ratio for 121Ce wasestimated to be(1.0±0.5)%.中国科学院八五重大项目,国家自然科学基