通过费米能区重离子碰撞产额分布来研究^(16)O原子核的团簇结构

Probing Clustering Configurations of ^(16)O by the Yield Distribution in Heavy Ion Collisions at Fermi Energy

近几年来,原子核核内的α团簇结构引起了人们的广泛关注。本工作的目的是讨论在费米能区下重离子碰撞的碎片产额分布是否可以作为研究轻核中α团簇结构的工具。本文基于扩展的量子分子动力学输运模型(EMQD)模拟了^(16)O具有4种不同的初始化α构型(长链型、风筝型、四方型以及正四面体型)的^(16)O+^(16)O反应,通过观察碎片产额多重数分布情况研究了具有不同结构的团簇核的核反应。计算结果表明,碰撞后产生的自由质子及4He的产额受不同构型的影响明显,表明4He/proton可以作为团簇结构的一个表征量。此外,自由质子及4He的出射θ和φ角及动能能谱可以用来提取^(16)O的α团簇构型信息。

In recent years,the cluster structure in nuclei has attracted a lot of attention.The goal of this work is to investigate the yield distribution of heavy ion collisions at Fermi energy and evaluate theαcluster configurations in light nuclei.The^(16)O+^(16)O reactions with four different initializationαconfigurations(long chain,kite,square,tetrahedron)are simulated based on the Extended Quantum Molecular Dynamics(EQMD)transport model.The nuclei with different structures are investigated by observation of the multiplicity distribution of yields in nuclear reactions.It is found that the yields of free protons and ^(4) He were affected by different cluster configurations,which indicates that ^(4) He/proton can be used as a characterization of cluster structure.In addition,theαcluster configuration information of^(16)O can be extracted from the outgoingθandφand the kinetic energy spectrum of of free protons and ^(4) He.