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arXiv 1802.00658nucl-exastro-ph.HE
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质子在~(12)C上非弹性散射4.438- MeV谱线的形状和角分布

Shape and angular distribution of the 4.438-MeV line from proton inelastic scattering off 12C

J. Kiener

摘要:

本文详细研究了质子在~(12)C表面非弹性散射中4.438MeV γ射线的发射。为此,两个独立的描述相关的散射和发射过程已经开发,一个直接反应机制和其他的化合物核(CN)组件。直接反应计算的耦合通道形式主义的框架内,而CN组件被描述为一个叠加的单独的共振与明确的自旋和宇称,处理与角动量耦合理论。这两个组件被不相干地添加和比较的一个全面的数据集测量的线条形状和伽玛射线角分布的质子能量范围Ep = 5.44 - 25.0兆电子伏。在Ep ~ 14 - 25 MeV范围内,与数据吻合良好,主要是直接反应成分。在较低的能量,一个重要的CN组件需要描述线的形状和角分布数据。一般来说,对于自旋和宇称对应于已知附近共振的CN分量,可以找到数据的良好描述。与以前的计算相比,新的计算显著提高了与线形数据的一致性。根据这些结果,预测的线的形状和伽马射线的角分布Ep = 100兆电子伏的太阳耀斑和质子放射治疗的伽马射线发射。

英文摘要:

The emission of the 4.438-MeV gamma-ray line in proton inelastic scattering off 12C has been investigated in detail. For this, two independent descriptions of the correlated scattering and emission process have been developed, one for the direct reaction mechanism and the other for the compound-nucleus (CN) component. Direct reactions were calculated in the framework of the coupled-channels formalism, while the CN component was described as a superposition of separate resonances with definite spin and parity, treated with the angular momentum coupling theory. Both components were incoherently added and compared to a comprehensive data set on measured line shapes and gamma-ray angular distributions in the proton energy range Ep = 5.44 - 25.0 MeV. In the range Ep ~ 14 - 25 MeV, good agreement with data was obtained with a dominating direct reaction component. At lower energy, an important CN component was required to describe line shape and angular distribution data. In general, a good decription of the data could be found for a CN component with spin and parity corresponding to a known nearby resonance. The new calculation improves significantly the agreement with line shape data compared to previous ones. Based on these results, predictions for line shapes and gamma-ray angular distributions up to Ep = 100 MeV were made and applied to gamma-ray emissions in solar flares and proton radiotherapy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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