摘要
使用离线ｙ能谱法和厚靶──厚收集箔技术测量了４０ＭｅＶ／ｕ４０Ａｒ和Ｃｕ相互作用中靶余核的生成截面和前向平均反冲射程ＦＷ值．根据电荷分布假设得到了靶余核的质量产额分布．从ＦＷ值导出了重离子碰撞中的线性动量转移．与１２Ｃ＋Ｃｕ和２０Ｎｅ＋Ｃｕ的类似结果比较指出，在相同的弹核速度下，相应于中心碰撞的相对线性动量转移随弹核质量增加而减小，但是在４０Ａｒ离子和Ｃｕ的中心碰撞中产生的复合系统的激发能比１２Ｃ和２０Ｎｅ离子碰撞情况下更高，达到每核子５．３ＭｅＶ．
Cross Sections and average forward recoil range FW were measured for target residues from the interaction of Cu with 40MeV/u 40Ar ions using off-line y-ray spectroscopy.The mass yield distribution was obtained with assumption of charge distribution.The linear momentum transfer was calculated from FW values.A comparison with similar results of 12C+ Cu and 20Ne+ Cu reactions indicates that the fractional linear momentum transfer,corresponding to central collisions,decreases with increasing projectile mass at the same energy per nucleon. However,the excitation energy of the composite system created from the collisions of Cu with 40Ar ions reached the value of 5.3MeV /u and was higher than those from the collisions with 12C and 20Ne ions.
出处
《高能物理与核物理》
CSCD
北大核心
1995年第11期991-997,共7页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
关键词
氩40
铜
靶余核
FW值
相互作用
r+Cu,FW (average forward recoil range),mass yield distribution,linear momentum transfer.
