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arXiv 0704.1024nucl-th
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用现代分波分析实验数据确定中子-质子散射低能参数

Determination of Low-Energy Parameters of Neutron--Proton Scattering on the Basis of Modern Experimental Data from Partial-Wave Analyses

V. A. Babenko, N. M. Petrov

摘要:

利用SAID核子-核子数据库中的最新实验数据,确定了中子-质子散射有效射程展开中的三重态和单重态低能参数.结果显着不同的基础上获得的奈梅亨群的相移和矛盾的参数值,目前被用作实验的类似参数。借助于从SAID核子-核子数据库中得到的零能中子被质子散射的总截面$σ_{0}=20.426 $ b和中子-质子相干散射长度$f=-3.755 $ fm的相移值,与Houk得到的实验截面值$σ_{0}=20.436\pm 0.023 $ b和Houk和Wilson得到的实验散射长度值$f=-3.756\pm 0.009 $ fm完全一致。但是它们与根据Dilg的$σ_{0}=20.491\pm 0.014 $ b的截面值和根据Koester和Nisher的$f=-3.7409\pm 0.0011 $ fm的相干散射长度值相矛盾。

英文摘要:

The triplet and singlet low-energy parameters in the effective-range expansion for neutron--proton scattering are determined by using the latest experimental data on respective phase shifts from the SAID nucleon--nucleon database. The results differ markedly from the analogous parameters obtained on the basis of the phase shifts of the Nijmegen group and contradict the parameter values that are presently used as experimental ones. The values found with the aid of the phase shifts from the SAID nucleon--nucleon database for the total cross section for the scattering of zero-energy neutrons by protons, $σ_{0}=20.426 $b, and the neutron--proton coherent scattering length, $f=-3.755 $fm, agree perfectly with the experimental cross-section values obtained by Houk, $σ_{0}=20.436\pm 0.023 $b, and experimental scattering-length values obtained by Houk and Wilson, $f=-3.756\pm 0.009 $fm, but they contradict cross-section values of $σ_{0}=20.491\pm 0.014 $b according to Dilg and coherent-scattering-length values of $f=-3.7409\pm 0.0011 $fm according to Koester and Nistler.

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