Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

Full text (ru)

V. A. Babenko, N. M. Petrov

Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract: Singlet low-energy parameters of neutron-proton scattering are calculated on the basis of approximating the singlet effective-range function k cot δ_s by polynomials with the help of the latest experimental data on phase shifts of np-scattering from the SAID nucleon-nucleon database (data of the GWU group). The obtained values of the singlet low-energy parameters are a_s = -23.719085 fm, r_0s = 2.625917 fm, ν_2s = 0.0008677 fm³, ν_3s = -0.01328 fm⁵, ν_4s = 0.2370 fm⁷. With the obtained values of the low-energy parameters, precise description of singlet phase shift in the energy interval T ≲ 10 MeV is received by using the effective-range expansion. Low-energy neutron-proton scattering parameters for the experimental data from the SAID database differ markedly from the analogous results obtained for data of the Nijmegen group. Obtained effective range parameters corresponding to the experimental data from the SAID database lead to an extremely well description of experimental total cross section of neutron-proton scattering, which is in contrast to the set of the effective range parameters of the Nijmegen group.

Keywords: effective range parameters, singlet low-energy parameters of neutron-proton scattering, np-scattering, scattering phase shifts, T ≲ 10 MeV.

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