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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Stopping of 236 keV - 3.019 MeV protons in mylar and polypropylene films
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Stopping of 236 keV - 3.019 MeV protons in mylar and polypropylene films

机译：聚酯薄膜和聚丙烯薄膜中236 keV-3.019 MeV质子的阻止

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摘要

The stopping powers of polypropylene and mylar polymers for protons have been accurately measured over the energy intervals E_p = (0.352-3.009) MeV and E_p = (0.236-3.019) MeV, respectively. Ab initio calculations using the Sigmund-Schinner binary collision theory for electronic stopping yielded S(E) values fairly consistent with the measured data that show no noticeable deviations from the Bragg-Kleeman additivity rule. The data have also been analyzed in the framework of the modified Bethe-Bloch theory assuming additivity. Values of the mean excitation and ionization potential, I, and of the Barkas parameter, b, have been deduced for the two polymers and for their (C, O) atomic constituents by adopting values of these parameters recommended in the ICRU-49 report for the H element. Thus, the respective I-values {(56.90 +- 0.72) eV, (79.92 +- 1.30) eV} for the two polymers and the same b-value 1.39 for their (C, O) atomic constituents have been determined by adopting for H the value b = 1.8, while the I-values {(81.73 +- 1.38) eV, (109.46 +- 6.55) eV} have been deduced for the (C, O) constituents by adopting for H the value I = 19.2 eV. Priorily, the shell, Barkas and Bloch corrections to the calculated S(E) values have been evaluated for both polymers over the explored respective energy ranges. The obtained results are discussed in comparison with previous ones when reported in the literature to our knowledge.
机译：分别在能量区间E_p =（0.352-3.009）MeV和E_p =（0.236-3.019）MeV上准确测量了聚丙烯和聚酯薄膜聚合物对质子的阻止能力。使用Sigmund-Schinner二元碰撞理论进行的电子停止从头算计算得出的S（E）值与测得的数据相当吻合，表明与Bragg-Kleeman可加性规则没有明显的偏差。还假设了可加性，在改进的Bethe-Bloch理论的框架内对数据进行了分析。通过采用ICRU-49报告中建议的以下参数的值，推导出了两种聚合物及其（C，O）原子成分的平均激发电离电势I和Barkas参数b的值。 H元素。因此，两种聚合物的I值{（56.90 +-0.72）eV，（79.92 +-1.30）eV}和它们的（C，O）原子成分的相同b值1.39通过采用H的值b = 1.8，而I值{（81.73 +-1.38）eV，（109.46 +-6.55）eV}已通过为H推导H（I，19.2 eV）来推导（C，O）成分。事先，已评估了两种聚合物在所探索的各自能量范围内对所计算出的S（E）值的壳校正，Barkas校正和Bloch校正。在文献中据我们所知，将获得的结果与以前的结果进行比较。

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