Stopping power and straggling of H (proton) and He (helium) in solid targets (Au, AL, K, Cs) | ||
| Thi-Qar Medical Journal | ||
| Article 1, Volume 11, Issue 1, December 2016, Pages 162-176 | ||
| Author | ||
| Saher Mazher Mutesher | ||
| Abstract | ||
| Abstract: Stopping power and straggling have been calculated by using Random Phase Approximation (RPA) at low velocity at the first and second approximation order, where the influence of damping has been ignored. At high velocities of a projectile, Plasmon Pole Approximation (PPA) has been used to calculate them without damping. In this research, we discuses interaction of protons H and helium He with solid matter Au (rs=1.49 a.u.), AL (rs=2.12 a.u.), K (rs=4.86 a.u.) and Cs (rs=5.88 a.u.) in different adverbs. The results were obtained in all areas of the present work showed a good agreement with the previous works for stopping power and variance in energy loss (straggling). The results also showed detailed behavior of (H and He) of its interactions with four electron gas targets medium. The results have been achieved by using programs of matlab language, which performed for the numerical calculation. Introduction A heavy ion passing through a target of convinced thickness will suffer a number of collisions with the atoms and electrons of the target. There is amount of energy will be transferred to the target atom and electron in each collision. Because the collisions are random and discrete, statistical fluctuation is expected in the number of collisions. [1, 2] variance of stopping power will be studied because of the statistical nature for the stopping power quality. The threshold effect describes the energy loss and straggling in a single crystal in channeling they found a mass effect between channeled protons and neutrons in the relative straggling values. [3, 4]. | ||
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