arXiv 1005.53602010-05-31nucl-thhep-phnucl-ex

中子-核散射的总截面

Total cross sections for neutron-nucleus scattering

S. V. Suryanarayana, H. Naik, S. Ganesan, S. Kailas, R. K. Choudhury, Guinyum Kim

备注：: 9 pages, 20figures, Poster number ND-1457, ND2010 Conference in Korea
DOI：: 10.3938/jkps.59.971

摘要：

中子散射截面的系统性在各种材料上的中子能量高达几百MeV的ADSS应用是重要的。Ramsauer模型被广泛应用于中子核总截面的系统学研究。本文研究了核有效半径参数（r $_0$）对中子总截面的Ramsauer模型拟合的影响。对W. P. Abfalterer，F. B. Bateman，{ \it et.等，}，从20 MeV到550 MeV。提供了可以在周期表上拟合总截面数据的全局拟合函数以及所需的全局参数集。全局拟合预测在数据的$\pm 8%$偏差内，显示了改进的范围。已经观察到，单独地对r $_0$参数进行精细调整，可以在$\pm 4%$偏差内给出非常好的中子总散射数据的Ramsauer模型描述。Ramsauer模型拟合所需的r $_0$值被示为核质量数的函数，并建议r $_0$值作为质量数的函数的经验公式。在中子散射的光学模型方法中，我们用SCAT 2程序对Koning-Deleroche势尾的实部进行了修正，使之与中子总截面相拟合。修正后的势尾在超过200 MeV的中子能量下具有不同的能量依赖性，并拟合了从Al到Pb的总截面。

英文摘要：

Systematics of neutron scattering cross sections on various materials for neutron energies up to several hundred MeV are important for ADSS applications. Ramsauer model is well known and widely applied to understand systematics of neutron nucleus total cross sections. In this work, we examined the role of nuclear effective radius parameter (r$_0$) on Ramsauer model fits of neutron total cross sections. We performed Ramsauer model global analysis of the experimental neutron total cross sections reported by W. P. Abfalterer, F. B. Bateman, {\it et. al.,}, from 20MeV to 550MeV for nuclei ranging from Be to U . The global fit functions which can fit total cross section data over periodic table are provided along with the required global set of parameters. The global fits predict within $\pm 8%$ deviation to data, showing the scope for improvement. It has been observed that a finer adjustment of r$_0$ parameter alone can give very good Ramsauer model description of neutron total scattering data within $\pm 4%$ deviation. The required r$_0$ values for Ramsauer model fits are shown as a function of nuclear mass number and an empirical formula is suggested for r$_0$ values as a function of mass number. In optical model approach for neutron scattering, we have modified the real part of Koning-Deleroche potentails to fit the neutron total cross sections using SCAT2 code. The modified potentails have a different energy dependence beyond 200MeV of neutron energy and fit the total cross sections from Al to Pb.

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