Application of the Second Born Approximation to Excitation of Hydrogen Atoms by Protons and Antiprotons Impact  

作　　者：Reda S. Tantawi Samia M. Said 

机构地区：[1]Department of Mathematics, Faculty of Science, Zagazig University, Zagazig, Egypt [2]Department of Basic Engineering Sciences,Faculty of Engineering, Sana'a Universi, Sana'a, Yemen

出　　处：《Chinese Physics Letters》2008年第10期3635-3638,共4页中国物理快报（英文版）

摘　　要：We present and compare total cross sections for excitation in collisions of protons and antiprotons with hydrogen atoms in the 2s state. Calculations axe performed in the framework of the second Born approximation, in the energy range of 5-1000 keV. We apply the usual approach of the second Born approximation, which approximates the summation raised by retaining few terms, as well as another approach approximates all energies corresponding to the intermediate states to that corresponding to the initial state. The annihilation effect in the case of the antiproton collision is investigated. We compare the results with the previous theoretical calculations.We present and compare total cross sections for excitation in collisions of protons and antiprotons with hydrogen atoms in the 2s state. Calculations axe performed in the framework of the second Born approximation, in the energy range of 5-1000 keV. We apply the usual approach of the second Born approximation, which approximates the summation raised by retaining few terms, as well as another approach approximates all energies corresponding to the intermediate states to that corresponding to the initial state. The annihilation effect in the case of the antiproton collision is investigated. We compare the results with the previous theoretical calculations.

关 键 词：the power-law exponents precipitation durative abrupt precipitation change 

分 类 号：O562[理学—原子与分子物理]