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Nuclear Theory·nucl-th

Tuesday·June 29, 2021

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 01

    [Submitted on 27 Jun 2021]

    Relativistic correction of the Coulomb interaction in the local density approximation for energies and radii in doubly-magic nuclei

    Tomoya Naito

    Effects of the relativistic correction of the Coulomb interaction on doubly-magic nuclei are discussed with Skyrme Hartree--Fock calculations. The relativistic correction is treated by using the local density approximation. It is found that the correction to the total energy is about for , while proton and neutron radii do not change significantly. This difference is larger than the difference of the Coulomb exchange (Fock) energy calculated with the local density (Hartree--Fock--Slater) approximation and that with the exact treatment and the neutron finite-size effect. Effects of the correction are also compared to the correction due to the vacuum polarization. It is shown that the two contributions to the total energy are comparable in light nuclei, but the latter dominates in heavy nuclei, while the contribution of the relativistic correction to the total energy is non-negligible compared to the target accuracy of the DFT calculation.

    Comments:
    19 pages, 2 figures, 4 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2106.14270 [pdf]
    PTEP(2022)·1 citation
  2. 02

    [Submitted on 28 Jun 2021]

    Binding two and three particles in cold neutron matter

    H. Moriya · H. Tajima · W. Horiuchi · K. Iida · E. Nakano

    We elucidate the fate of neighboring two and three- particles in cold neutron matter by focusing on an analogy between such systems and Fermi polarons realized in ultracold atoms. We describe in-medium excitation properties of an particle and neutron-mediated two- and three- interactions using theoretical approaches developed for studies of cold atomic systems. We numerically solve the few-body Schrödinger equation of particles within standard cluster models combined with in-medium properties of particles. We point out that the resultant two- ground state and three- first excited state, which correspond to Be and the Hoyle state, respectively, known as main components in the triple- reaction, can become bound states in such a many-neutron background although these states are unstable in vacuum. Our results suggest a significance of these in-medium cluster states not only in astrophysical environments such as core-collapsed supernova explosions and neutron star mergers but also in neutron-rich nuclei.

    Comments:
    9 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2106.14469 [pdf]
    PRC(2021)·14 citations
  3. 03

    [Submitted on 28 Jun 2021]

    Cluster and hyper-cluster production in relativistic heavy-ion collisions within the Parton-Hadron-Quantum-Molecular-Dynamics approach

    Susanne Gläßel🇩🇪 · Viktar Kireyeu🇷🇺 · Vadim Voronyuk🇷🇺 · Jörg Aichelin🇫🇷 · Christoph Blume🇩🇪 · Elena Bratkovskaya🇩🇪 · Gabriele Coci🇩🇪 · Vadim Kolesnikov🇷🇺 · Michael Winn🇫🇷

    We study cluster and hypernuclei production in heavy-ion collisions at relativistic energies employing the Parton-Hadron-Quantum-Molecular-Dynamics (PHQMD) approach, a microscopic n-body transport model based on the QMD propagation of the baryonic degrees of freedom with density dependent 2-body potential interactions. All other ingredients of PHQMD, including the collision integral and the treatment of the quark-gluon plasma (QGP) phase, are adopted from the Parton-Hadron-String Dynamics (PHSD) approach. In PHQMD the cluster formation occurs dynamically, caused by the interactions. The clusters are recognized by the Minimum Spanning Tree (MST) algorithm. We present the PHQMD results for cluster and hypernuclei formation in comparison with the available experimental data at AGS, SPS, RHIC-BES and RHIC fixed target energies. We also provide predictions on cluster production for the upcoming FAIR and NICA experiments. PHQMD allows to study the time evolution of formed clusters and the origin of their production, which helps to understand how such weakly bound objects are formed and survive in the rather dense and hot environment created in heavy-ion collisions. It offers therefore an explanation of the 'ice in the fire' puzzle.

    Comments:
    25 pages, 33 figures, Fig. 13 updated
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2106.14839 [pdf]
    PRC(2022)·62 citations

Affiliations

first authorsco-authorsvia INSPIRE