Wilson John W, Tweed John, Walker Steve A, Cucinotta Francis A, Tripathi Ram K, Blattnig Steve, Mertens Christopher J
NASA Langley Research Center, Hampton, VA 23681-2199, USA.
Adv Space Res. 2005;35(2):185-93. doi: 10.1016/j.asr.2005.03.108.
A new version of the HZETRN code capable of simulating HZE ions with either laboratory or space boundary conditions is under development. The computational model consists of combinations of physical perturbation expansions based on the scales of atomic interaction, multiple scattering, and nuclear reactive processes with use of asymptotic/Neumann expansions with non-perturbative corrections. The code contains energy loss with straggling, nuclear attenuation, nuclear fragmentation with energy dispersion and downshifts, and off-axis dispersion with multiple scattering under preparation. The present benchmark is for a broad directed beam for 1 A GeV iron ion beams with 2 A MeV width and four targets of polyethylene, polymethyl metachrylate, aluminum, and lead of varying thickness from 5 to 30 g/cm2. The benchmark quantities will be dose, track averaged LET, dose averaged LET, fraction of iron ion remaining, and fragment energy spectra after 23 g/cm2 of polymethyl metachrylate.
一种能够在实验室或空间边界条件下模拟高能重离子（HZE）的新版HZETRN代码正在开发中。该计算模型由基于原子相互作用、多次散射和核反应过程尺度的物理微扰展开组合而成，并使用带有非微扰修正的渐近/诺伊曼展开。该代码包含能量损失与离散、核衰减、带有能量色散和能量下移的核裂变，以及正在编制的考虑多次散射的离轴色散。目前的基准测试针对的是宽度为2 A MeV、能量为1 A GeV的宽定向铁离子束，以及四个不同厚度（5至30 g/cm²）的聚乙烯、聚甲基丙烯酸甲酯、铝和铅靶。基准测试量将包括剂量、径迹平均传能线密度（LET）、剂量平均LET、剩余铁离子的比例，以及经过23 g/cm²聚甲基丙烯酸甲酯后的碎片能谱。
