分类: 物理学 >> 核物理学 分类: 物理学 >> 地球物理学、天文学和天体物理学 提交时间: 2024-01-09
摘要: According to the recent studies, the gravitational wave (GW) echoes are expected to be generated by quark stars composed of ultrastif quark matter. The ultrastif equations of state (EOS) for quark matter were usually obtained either by a simple bag model with artifcially assigned sound velocity or by employing interacting strange quark matter (SQM) depicted by simple reparameterization and rescaling. In this study, we investigate GW echoes with EOSs for SQM in the framework of the equivparticle model with density-dependent quark masses and pairing efects. We conclude that strange quark stars (SQSs) can be sufciently compact to possess a photon sphere capable of generating GW echoes with frequencies in the range of approximately 20 kHz. However, SQSs cannot account for the observed 72 Hz signal in GW170817 event. Furthermore, we determined that quark-pairing efects play a crucial role in enabling SQSs to satisfy the necessary conditions for producing these types of echoes.
分类: 物理学 >> 核物理学 提交时间: 2023-06-20
摘要: We have calculated the multinucleon transfer reactions of 208Os, 208Pt, 208Hg, 208Pb,208Po, 208Rn, 208Ra,132,136Xe bombarding on 232Th and 248Cm at Coulomb barrier energies within the dinuclear system model, systematically. The results are in good agreement with the available experimental data. The Coulomb effect and shell effect on the production of actinides in these reactions have been investigated thoroughly. Potential energy surface and total kinetic energy mass distributions in the reactions 208Hg, 208Pb and208Po colliding on 248Cm and 232Th are calculated and analyzed, respectively. It is found that PES and TKE spectra manifest the fragment formation mechanism in the multinucleon transfer reactions. The isospin effect and shell effect are shown in PES and TKE. Production cross-sections of multinucleon transfer products are highly dependent on the isobar projectiles with the mass number A = 208. The isobar projectiles with larger N/Z ratios are favorable for creating neutron-rich target-like fragments. The isobar projectiles with larger charge number induced products tend to shift to proton-rich regions. Coulomb potential coupled with the shell effect is shown in production cross-sections of actinide isotopes. Based on the radioactive projectiles induced reactions, we have predicted massive new actinide isotopes around nuclear drip lines, even could access the superheavy nuclei region.