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Nuclear Theory·nucl-th

Monday·October 16, 2023

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    Heavy flavor production in the Parton-Hadron-String Dynamics (PHSD)

    Taesoo Song🇩🇪 · Joerg Aichelin🇫🇷 · Elena Bratkovskaya🇩🇪

    Relativistic heavy-ion collisions produce a hot and dense nuclear matter, through which one can study the phase diagram of QCD. Open and hidden heavy flavors are promising probes to search for the properties of the hot and dense nuclear matter under extreme conditions. We present how the production and interactions of open and hidden heavy flavors in heavy-ion collisions are realized in the Parton-Hadron-String Dynamics, which is a non-equilibrium microscopic transport approach for the description of the dynamics of strongly interacting hadronic and partonic matter.

    nucl-thPoS(2024)·0 citations
  2. 02

    Finite temperature effects in magnetic dipole transitions

    Amandeep Kaur · Esra Yüksel · Nils Paar

    Finite temperature effects in electromagnetic transitions in nuclei contribute to many aspects of nuclear structure and astrophysically relevant nuclear reactions. While electric dipole transitions have already been extensively studied, the temperature sensitivity of magnetic transitions remains largely unknown. This work comprises the study of isovector magnetic dipole excitations (M1) occurring between spin-orbit (SO) partner states using the recently developed self-consistent finite temperature relativistic quasiparticle random phase approximation (FT-RQRPA) in the temperature range from 0 to 2 MeV. The M1 strength distributions of Ca and Sn isotopic chains exhibit a strong temperature dependence. The M1 strength peaks shift significantly towards the lower energies due to the decrease in SO splitting energies and weakening of the residual interaction, especially above the critical temperatures () where the pairing correlations vanish. By exploring the relevant two-quasiparticle () configurations contributing to the M1 strength of closed- and open-shell nuclei, new proton and neutron excitation channels between SO partners are observed in low- and high-energy regions due to the thermal unblocking effects around the Fermi level. At higher temperatures, we have noticed an interesting result in Ca nuclei, the appearance of M1 excitations, which are forbidden at zero temperature due to fully occupied (or fully vacant) spin-orbit partner states.

    nucl-thPRC(2024)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE