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....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.展开更多
Relativistic microscopic optical potential of the nucleon-nucleus scattering isobtained from the relativistic Brueckner-Bethe-Goldstone（RBBG）equation.The com-plex effective mass of a nucleon in the medium is phenome...Relativistic microscopic optical potential of the nucleon-nucleus scattering isobtained from the relativistic Brueckner-Bethe-Goldstone（RBBG）equation.The com-plex effective mass of a nucleon in the medium is phenomenologically determined by afit to P-<sup>40</sup>Ca scattering data at E<sub>p</sub>=200 MeV.The behavior of the optical potential witha complex effective mass for P-<sup>40</sup>Ca scattering at E<sub>p</sub>=200 MeV is compared with that ofa real effective mass.The relativistic microscopic optical potentials with both the com-plex and real effective masses,obtained from the RBBG equation,are used to studyp-<sup>16</sup>O,<sup>40</sup>Ca and <sup>208</sup>Pb scattering problem at E<sub>p</sub>=800 MeV.The calculated results,suchas cross sections and spin observables,are theoretical prediction and are compared withexperimental data.展开更多
文摘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.
基金The project supported by National Natural Science Foundation of China
文摘Relativistic microscopic optical potential of the nucleon-nucleus scattering isobtained from the relativistic Brueckner-Bethe-Goldstone（RBBG）equation.The com-plex effective mass of a nucleon in the medium is phenomenologically determined by afit to P-<sup>40</sup>Ca scattering data at E<sub>p</sub>=200 MeV.The behavior of the optical potential witha complex effective mass for P-<sup>40</sup>Ca scattering at E<sub>p</sub>=200 MeV is compared with that ofa real effective mass.The relativistic microscopic optical potentials with both the com-plex and real effective masses,obtained from the RBBG equation,are used to studyp-<sup>16</sup>O,<sup>40</sup>Ca and <sup>208</sup>Pb scattering problem at E<sub>p</sub>=800 MeV.The calculated results,suchas cross sections and spin observables,are theoretical prediction and are compared withexperimental data.
