Investigations of inelastic cross sections of H_(2)O molecule by He^(2+) and C^(6+) projectiles with energy range around the Bragg peak  

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作  者:Guo-Zhuang Li Cheng-Ye Sun Rui Cheng Yan-Shi Zhang Liang-Wen Chen Sheng Zhang Xin-Xia Li Lei Yang 

机构地区:[1]School of Nuclear Science and Technology,University of South China,Hengyang 421001,China [2]Advanced Energy Science and Technology Guangdong Laboratory,Huizhou 516000,China [3]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [4]Interdisciplinary Center for Fundamental and Frontier Sciences,Nanjing University of Science and Technology,Jiangyin 214443,China [5]Center for Basic Teaching and Experiment,Nanjing University of Science and Technology,Jiangyin 214443,China [6]School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China

出  处:《Nuclear Science and Techniques》2025年第2期141-154,共14页核技术(英文)

基  金:supported in part by the National Natural Science Foundation of China(Nos.12105327 and 11775108);the Hunan Provincial Innovation Foundation For Postgraduate(No.QL20220210);the Advanced Energy Science and Technology Guangdong Laboratory.

摘  要:Inelastic collisions are the dominant cause of energy loss in radiotherapy.In the energy range around the Bragg peak,single ionization(SI)and single-electron capture(SC)are the primary inelastic collisions that lead to energy loss.This study employs the classical trajectory Monte Carlo method to study the SI and SC processes of H_(2)O molecules using He^(2+) and C^(6+) projectiles in the energy range of 10 keV/u to 10 MeV/u.The total cross sections,single differential cross sections,impact parameter dependence of SI and SC,and fragmentation cross sections were investigated.Results illustrate that the cross section for SI is the highest when the projectile energy is close to the Bragg peak energy.When the projectile energy is below the Bragg peak energy,the ionized electrons in the forward direction dominate,and the removal of electrons can be associated with large impact parameters.As the projectile energy increases,the emission angle of the electrons gradually transitions from small angles(60°~120°)to large angles(60°~120°),and the removal of electrons is associated with small impact parameters.The energy distributions of the ionized electron are similar when the projectile energy is equal to,below or above the Bragg peak energy.The fragmentation cross sections after SI and SC in the energy range around the Bragg peak were also estimated.

关 键 词:Classical trajectory Monte Carlo Heavy ion-water molecule collision Inelastic cross sections 

分 类 号:R815[医药卫生—放射医学] TL99[医药卫生—临床医学]

 

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