氢分子离子和质子在碳膜中的能量损失测量

利用高分辨原子碰撞装置,直接测量氢分子离子和质子束流的人射能量、通过碳膜之后的透射能量分布和库仑爆作碎片的能谱。由此确定透射H_2~+及其库仑爆作碎片的能量损失△E_p和△E_M和H~+的能量损失△E_A。质于的能损率测量结果与前人推算结果一致。而H_2~+的质子碎片能损率为H~+的两倍以上.结果表明,在相同核子速度和靶厚度下,△E_r最小,△E_M为△E_A的2—3倍。

ENERGY LOSS OF FAST H_2+ MOLECULAR IONS AND PROTON IN CARBON FOILS

The energy spectra of incident H2+ and H+ ions, their transmiting beams and Coulomb explosion fragments of H2+ ions in carbon foils were measured directly using high energy resolution arrangement. Based on these measured spectra, the energy loss of AEM,. AEr and AEAwere decided for H2+ and H+ in carbon foil, respectively. The measument results of stopping power for H+in carbon foil coincide with those from reference 17]. Our results suggests that the energy loss of proton, AEx, is larger than those of transmitting H2+, AEr,and less than those of Coulomb explosion fragments of H2+, AEM , about a factor of 3 at the same target and incident energy per nucleon. Therefore,there has a different characteristic on energy loss for molecular and atomic ions.