放射性核束引起反应中轻带电粒子发射的同位旋效应

Isospin Effects on the Yield of LCPs in the Reaction of RNB

研究了 69MeV/u36 Ar轰击Be靶的碎裂产物与Si靶反应引起的前角区轻带电粒子的发射产额与原子核同位旋、原子核序数的关系 .发现前角区轻带电粒子发射产额对于丰质子核的结构非常敏感 ,与同位旋存在一种指数关系 .因此可以把前角区轻带电粒子发射产额作为探测丰质子核结构的一种手段 ,也是一种新的验证一个核是否具有质子晕结构的实验证据 .

The yield of light charged particles (LCPs) emitted at forward angles is investigated in the reactions of Si target bombarded by the fragments produced in the fragmentation of 69AMeV 36 Ar. It is found that the yield of LCPs increases with decreasing the neutron number of fragment isotopes,and for the lighter fragments,the effect is more prominent. Moreover the yield of LCPs decrease with the increase of the proton number of fragments with the same isospin. It indicates that the yield of LCPs is very sensitive to the structure of the nuclei near the proton drip line. It can be regarded as a possible probe to explore the structure of proton rich nuclei and a new way to provide an evidence for existing proton halo.