RELATIVISTIC MEAN-FIELD EFFECTIVE NN FORCES IN DYNAMICAL MODELING OF HEAVY-ION FUSION

Oct 13, 2020, 5:25 PM
25m
Online

Online

Oral report Section 2. Experimental and theoretical studies of nuclear reactions. Section 2. Experimental and theoretical studies of nuclear reactions

Speaker

Dr Maria Chushnyakova (Omsk State Technical University)

Description

In the analysis of heavy-ion fusion cross-sections, the relativistic effects are usually ignored [1]. However, it is known that the fastest nucleons in a nucleus have the velocity close to a quarter of the speed of light. The relativistic mean-field (RMF) theory accounting for the effects of high nucleons velocity was successfully applied to reproduce the binding energies and astrophysical S-factors for proton-induced reactions [2].
In the present work, we demonstrate the results of the application of the RMF theory for describing the heavy-ion above-barrier fusion process of complex nuclei. The modeling is performed within the framework of a trajectory model [3-5] based on the double-folding approach and accounting for energy dissipation. We employ six different RMF parameter sets for the effective nucleon-nucleon (NN) forces. The forces as well as the resulting potentials and cross-sections are compared with those obtained using the non-relativistic M3Y NN-forces.
It turned out that several of the RMF parameter sets appeared to be inapplicable for the dynamical calculations of the fusion cross-sections. For the feasible parameter sets, we perform a quantitative comparison of the calculated above-barrier fusion excitation functions with the experimental ones for reactions involving spherical colliding nuclei.
1. Newton et al. // Phys. Rev. C 70 (2004) 024605.
2. Lahiri et al. // Int. J. Mod. Phys. E 25 (2016) 1650015.
3. Gontchar et al. // Phys. Rev. C 89 (2014) 034601.
4. Chushnyakova et al. // Phys. Rev. C 90 (2014) 017603.
5. Chushnyakova et al. // Nucl. Phys. A 997 (2020) 121657.

Primary authors

Dr Maria Chushnyakova (Omsk State Technical University) Prof. Igor Gontchar (Omsk State Transport University) Dr Natalya Khmyrova (Omsk State Transport University) Dr Anna Klimochkina (Lomonosov Moscow State University)

Presentation materials