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Low-energy parameters of neutron-neutron interaction in the effective-range approximation

机译:有效范围近似中子与中子相互作用的低能参数

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摘要

The effect of the mass difference between the charged and neutral pions on the low-energy parameters of nucleon-nucleon interaction in the~1S_0state is studied in the effective-range approximation. On the basis of experimental values of the singlet parameters of neutron-proton scattering and the experimental value of the virtual-state energy for the neutron-neutron systemin the~1S_0state, the following values were obtained for the neutron-neutron scattering length and effective range: a_(nn)= -16.59(117) fm and r_(nn)= 2.83(11) fm. The calculated values agree well with present-day experimental results.
机译:在有效范围近似中研究了带电和中性离子之间的质量差对〜1S_0状态下核子-核子相互作用的低能参数的影响。根据中子-质子散射单重态参数的实验值和中子-中子系统在〜1S_0状态下的虚态能量的实验值,得出以下中子-中子散射长度和有效范围的值:a_(nn)=-16.59(117)fm,r_(nn)= 2.83(11)fm。计算值与当前的实验结果非常吻合。

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