本文通过对7种材质(C、Al、Fe、Cu、Ag、W、Pb)电极片在1.25 Me V入射光子束作用下的电子发射产额进行模拟计算,研究了厚度和材质对阵列电离室电极片电子发射产额的影响关系。研究结果表明:阵列电离室电极片在辐射光子作用下的电子发射...本文通过对7种材质(C、Al、Fe、Cu、Ag、W、Pb)电极片在1.25 Me V入射光子束作用下的电子发射产额进行模拟计算,研究了厚度和材质对阵列电离室电极片电子发射产额的影响关系。研究结果表明:阵列电离室电极片在辐射光子作用下的电子发射产额在电极片厚度较厚时(特别是大于0.01 mm时),随着电极片厚度或电子密度的增大而明显减小。另外,电极片长度的选取需要结合电极的材质适当考虑。展开更多
Energy losses of 0.63-1.03MeV/atom Sin(n≤3)clusters in thin carbon films(2-12μg/cm^(2))have been measured by using a special experimental setup with Rutherford backscattering(RBS)technique.The experimental results s...Energy losses of 0.63-1.03MeV/atom Sin(n≤3)clusters in thin carbon films(2-12μg/cm^(2))have been measured by using a special experimental setup with Rutherford backscattering(RBS)technique.The experimental results show that for a given energy per atom,the energy loss of Si^(+)_(2) ions,as well as Si^(+)_(3) ions,is significantly larger than that of Si+ions.This is the first observation of energy loss enhancement in the measurements with RBS technique.The enhancement in energy loss(i.e.the cluster effect)is evident when the effective thickness of the carbon target is thin enough,but not evident when it is thick.The effect will not be obvious until the energy of the projectile is over a certain limit for a special target.This suggests that the cluster effect only occurs in the first layers of the target film,and that the energy of the projectile must be large enough for the effect to be seen.展开更多
文摘本文通过对7种材质(C、Al、Fe、Cu、Ag、W、Pb)电极片在1.25 Me V入射光子束作用下的电子发射产额进行模拟计算,研究了厚度和材质对阵列电离室电极片电子发射产额的影响关系。研究结果表明:阵列电离室电极片在辐射光子作用下的电子发射产额在电极片厚度较厚时(特别是大于0.01 mm时),随着电极片厚度或电子密度的增大而明显减小。另外,电极片长度的选取需要结合电极的材质适当考虑。
基金Supported by the National Natural Science Foundation of China under Grant No.19775006.
文摘Energy losses of 0.63-1.03MeV/atom Sin(n≤3)clusters in thin carbon films(2-12μg/cm^(2))have been measured by using a special experimental setup with Rutherford backscattering(RBS)technique.The experimental results show that for a given energy per atom,the energy loss of Si^(+)_(2) ions,as well as Si^(+)_(3) ions,is significantly larger than that of Si+ions.This is the first observation of energy loss enhancement in the measurements with RBS technique.The enhancement in energy loss(i.e.the cluster effect)is evident when the effective thickness of the carbon target is thin enough,but not evident when it is thick.The effect will not be obvious until the energy of the projectile is over a certain limit for a special target.This suggests that the cluster effect only occurs in the first layers of the target film,and that the energy of the projectile must be large enough for the effect to be seen.
