Bremsstrahlung emission from nucleon-nucleus reactions in dense medium of compact stars  

作　　者：Sergei P.Maydanyuk Ju-Jun Xie Kostiantyn A.Shaulskyi Sergei P.Maydanyuk;谢聚军;Kostiantyn A.Shaulskyi

机构地区：[1]Southern Center for Nuclear-Science Theory(SCNT),Institute of Modern Physics,Chinese Academy of Sciences,Huizhou 516000,China [2]Wigner Research Centre for Physics,Budapest,1121,Hungary [3]Institute for Nuclear Research,National Academy of Sciences of Ukraine,Kyiv,03680,Ukraine [4]Heavy Ion Science and Technology Key Laboratory,Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [5]School of Nuclear Sciences and Technology,University of Chinese Academy of Sciences,Beijing 101408,China

出　　处：《Chinese Physics C》2025年第4期113-141,共29页中国物理C(英文版)

摘　　要：Bremsstrahlung photons emitted during nucleon-nucleus reactions in compact stars are investigated.The influence of stellar medium density on emission intensity is studied from a quantum perspective for the first time.A bremsstrahlung model is generalized,where a new term describing the influence of the stellar medium is added to interactions between nucleons and nuclei(in the framework of a nuclear model of deformed oscillatoric shells).Polytropic EOS,Chandrasekar EOS,and Harrison-Wheeler EOS are employed for calculation.Haensel and Potekhin's unified EOS of neutron-star matter based on FPS and SLy EOSs are used for tests.Bremsstrahlung calculations are tested on existing measurements of bremsstrahlung in the scattering of protons off ^(197)Au nuclei at a proton beam energy of E_(p)=190 MeV.Many properties of bremsstrahlung emitted from nuclear processes in the stellar medium of compact stars are studied for the first time.In particular,the spectra of photons in the scattering of protons and neutrons off ^(4)He,^(8)Be,^(12)C,^(16O),^(24)Mg,40Ca,^(56)Fe are estimated based on stellar medium density.The medium of white dwarfs has a small influence on the bremsstrahlung emission from nuclear processes,while bremsstrahlung emission is intensive in neutron stars and it is changed in dependence on stellar medium and structure.

关 键 词：BREMSSTRAHLUNG photon coherent emission incoherent emission binding energy ground state properties of nuclei magnetic moment of neutron white dwarf neutron star polytropic EOS Chandrasekar EOS Harrison-Wheeler EOS nucleon-nucleus scattering 

分 类 号：P145.6[天文地球—天体物理]