Publication: Analytical version of the resonance coupled-channel model for d + T → 5He** → α + N reaction and its application for the description of low-energy D-T and D-3He scattering
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2019
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© 2019 Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University 'MEPhI'. All rights reserved.The purpose of the present paper is the formulation of the analytical version of the resonance coupled-channel model (RCCM) originally developed for D + T 5He** α + n reaction. The integral in the denominator of the Breit-Wigner type is examined in the expression for S-matrix elements of binary processes in this model. Imaginary part of this integral determines the energy-dependent decay width for the near-threshold channel. It is shown that this integral can be calculated explicitly with the Binet representation for the \|/-function (the logarithmic derivation of the gamma function). As the result the explicit expression for the S-matrix elements in the form of analytical functions of the channel momenta are obtained and the equivalence of the RCCM and the effective range approximation (Landau - Smorodinsky - Bethe approximation) is established on this basis. This allows expressing the parameters of the RCCM through the model independent system characteristics: the complex scattering length and the complex effective range. Several sets of model parameters of both approaches that provide a good description of the measured data on D + T->a+ n reaction and D-T elastic scattering are derived. By this means we find the location of the S-matrix poles on different Riemann sheets which corresponds to JK = (3/2)+ state of 5He and 5Li. In particular, the location of the resonance (R) and shadow (S) poles is determined: 5He**: ZR = 46.9 - i37.2 (keV) ZS = 81.7 - i3.5 (keV) 5Li**: ZR = 205.7 - i146.8 (keV) ZS = 264.4 + i112.0 (keV). Our results agree well with previous findings. The possible generalizations of the results obtained are discussed.
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Godes, A. I. Analytical version of the resonance coupled-channel model for d + T → 5He** → α + N reaction and its application for the description of low-energy D-T and D-3He scattering / Godes, A.I., Shablov, V.L., Kudriavtseva, A.S. // Izvestiya Wysshikh Uchebnykh Zawedeniy, Yadernaya Energetika. - 2019. - 2019. - № 2. - P. 198-207. - 10.26583/npe.2019.2.17