2018/07/25 by V. A. Sadovnikova, Sadovnikova, V. A.
Physics and Astronomy · #FOS: Physical sciences #Nuclear Physics and Applications #Nuclear Theory (nucl-th) #Nuclear physics research studies #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.1807.09580
openalex publication_date 2018/07/25 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
Results for the frequencies of zero-sound excitations in the isospin asymmetric nuclear matter are presented for the different parameters of asymmetry -1≤β≤ 1. The dispersion equations are constructed within the random phase approximation. We use the effective Landau-Migdal quasiparticle interaction with the special isospin dependence of the phase volume in the normalization factor C0. In the paper we present zero-sound branches of the dispersion equation solutions in the symmetric, asymmetric and neutron matter. The branches correspond to the different channels of decay of the zero-sound excitation in the nuclear matter or nuclei. In the asymmetric nuclear matter we obtain three branches of solutions on the physical and unphysical sheets of the complex frequency plane, ωs τ(k,β), τ=p,n,np. We demonstrate the change of branches with βand conversion of the three branches into two branches in symmetric nuclear matter (β=0) and into one branch in the neutron matter (β=1).