PaperPanorama
FAQ

Nuclear Theory·nucl-th

Monday·September 7, 2020

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 4 Sept 2020]

    Effects of ground-state correlations on magnetic dipole excitations in Ca

    Mitsuru Tohyama

    The effects of ground-state correlations on the magnetic dipole excitations in Ca are studied using an extended random phase approximation (ERPA) derived from the time-dependent density-matrix theory. Comparison is made with other extended RPA approaches, the renormalized RPA, the self-consistent RPA and the extended second RPA which also include the effects of ground-state correlations. It is pointed out that direct excitations from two particle - two hole space which are properly treated in ERPA cause strong magnetic dipole transitions in Ca.

    Comments:
    5 pages, 4 figures. arXiv admin note: text overlap with arXiv:1712.02006
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2009.02014 [pdf]
    1 citation
  2. 02

    [Submitted on 4 Sept 2020]

    Electron-capture decay in isotopic transfermium chains from self-consistent calculations

    Pedro Sarriguren

    Weak decays in heavy nuclei with charge numbers Z=101-109 are studied within a microscopic formalism based on deformed self-consistent Skyrme Hartree-Fock mean-field calculations with pairing correlations. The half-lives of beta+ decay and electron capture are compared with alpha-decay half-lives obtained from phenomenological formulas. Transfermium isotopes of Md, No, Lr, Rf, Db, Sg, Bh, Hs, and Mt that can be produced in the frontier of cold and hot fusion-evaporation channels are considered. Several isotopes are identified whose beta+/EC- and alpha-decay half-lives are comparable. The competition between these decay modes opens the possibility of new pathways towards the islands of stability.

    Comments:
    14 pages, 10 figures, accepted for publication in Journal of Physics G
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2009.02103 [pdf]
    J.Phys.G(2020)·9 citations
  3. 03

    [Submitted on 4 Sept 2020]

    Bose-Einstein Condensation of Quantum Hard-Spheres as a Deposition Phase Transition and New Relations Between Bosonic and Fermionic Pressures

    Kyrill A. Bugaev · Oleksii I. Ivanytskyi · Boris E. Grinyuk · Ivan P. Yakimenko

    We investigate the phase transition of Bose-Einstein particles with the hard-core repulsion in the grand canonical ensemble within the Van der Waals approximation. It is shown that the pressure of non-relativistic Bose-Einstein particles is mathematically equivalent to the pressure of simplified version of the statistical multifragmentation model of nuclei with the vanishing surface tension coefficient and the Fisher exponent , which for such parameters has the 1-st order phase transition. The found similarity of these equations of state allows us to show that within the present approach the high density phase of Bose-Einstein particles is a classical macro-cluster with vanishing entropy at any temperature which, similarly to the classical hard spheres, is a kind of solid state. To show this we establish new relations which allow us to identically represent the pressure of Fermi-Dirac particles in terms of pressures of Bose-Einstein particles of two sorts.

    Comments:
    8 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2009.02178 [pdf]
    Ukr.J.Phys.(2020)·1 citation
  4. 04

    [Submitted on 4 Sept 2020]

    Initial State Summary of Hard Probes 2020

    Bjoern Schenke🇺🇸

    The description of the initial state of heavy ion collisions, which covers the description of the incoming nuclei, the initial hard and soft interactions, the resulting spatial geometry of the produced matter, as well as the dynamic approach to a medium well described by hydrodynamics, has important consequences for the study of hard and electromagnetic probes. I will review new developments presented at Hard Probes 2020 that have an impact on these aspects of our understanding of the initial state of heavy ion and smaller system collisions.

    Comments:
    8 pages, 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2020)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2009.02278 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE