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Nuclear Theory·nucl-th

Monday·October 28, 2024

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 23 Oct 2024]

    Relativistic fluid dynamics in a 'hydro' frame

    Sayantani Bhattacharyya🇬🇧 · Sukanya Mitra🇮🇳 · Shuvayu Roy🇮🇳 · Rajeev Singh🇮🇳

    In this letter, we investigate how field redefinition influences the spectrum of linearized perturbations in relativistic fluid dynamics. We show that the hydrodynamic modes do not get affected under local field redefinition, whereas the non-hydrodynamic modes do. These non-hydrodynamic modes can be removed through a suitable all-order field redefinition. This process leads to a new frame containing only hydrodynamic modes, which we refer to as the hydro frame. Additionally, we demonstrate that the resulting stress-energy tensor may constitute an infinite series in momentum space, with the radius of convergence associated with the removed non-hydrodynamic mode, highlighting its role in the hydrodynamic expansion's validity.

    Comments:
    8 pages; Comments are welcome; Updated discussion and references
    Subjects:
    Nuclear Theory (nucl-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2410.19015 [pdf]
    5 citations
  2. 02

    [Submitted on 25 Oct 2024]

    Towards next-generation optical potentials for nuclear reactions and structure calculations

    Salvatore Simone Perrotta · Cole Davis Pruitt · Oliver C. Gorton · Jutta E. Escher (Lawrence Livermore National Laboratory)

    Optical-model potentials (OMPs) are critical ingredients for basic and applied nuclear physics. Present-day computational capabilities allow us to generate data-driven nucleon-nucleus OMPs that are non-local and exactly dispersive (as theoretically required to be), include statistically-sound uncertainty quantification, and are trained on both scattering and bound-state data from a wide area of the nuclear chart. Combined together, these features allow for significant improvement in fidelity and extrapolative power of the model. Here, we present preliminary work toward the development and training of such an OMP. The capability of the model to describe data at this first stage is encouraging.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2410.19269 [pdf]
    NPA(2025)·1 citation
  3. 03

    [Submitted on 25 Oct 2024]

    Nuclear structure properties and weak interaction rates of even-even Fe isotopes

    Jameel-Un Nabi · Mahmut Boyukata · Asim Ullah · Muhammad Riaz

    Nuclear structure properties and weak interaction rates of neutron rich even even iron (Fe) isotopes (A = 50 70) are investigated using the Interacting Boson Model1 (IBM1) and the proton neutron Quasiparticle Random Phase Approximation (pnQRPA) model. The IBM1 is used for the calculation of energy levels and the B(E2) values of neutron rich Fe isotopes. Later their geometry was predicted within the potential energy formalism of the IBM1 model. Weak interaction rates on neutron rich nuclei are needed for the modeling and simulation of presupernova evolution of massive stars. In the current study, we investigate the possible effect of nuclear deformation on stellar rates of even even Fe isotopes. The pnQRPA model is applied to calculate the weak interaction rates of selected Fe isotopes using three different values of deformation parameter. It is noted that, in general, bigger deformation values led to smaller total strength and larger centroid values of the resulting Gamow Teller distributions. This later translated to smaller computed weak interaction rates. The current finding warrants further investigation before it may be generalized.The reported stellar rates are up to 4 orders of magnitude smaller than previous calculations and may bear astrophysical significance.

    Comments:
    27 pages, 6 figures, 7 Tables
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2410.19335 [pdf]
    Chin.J.Phys.(2024)·2 citations
  4. 04

    [Submitted on 25 Oct 2024]

    Recent advances in coupled cluster computations of open-shell atomic nuclei

    Francesco Marino · Francesca Bonaiti · Sonia Bacca · Pepijn Demol · Thomas Duguet · Gaute Hagen · Gustav Jansen · Alexander Tichai

    In this contribution, we report on recent progress in coupled-cluster simulations of open-shell atomic nuclei using interactions consistently derived from chiral effective field theory. In particular, we compare different coupled-cluster approaches by computing binding energies and electric dipole polarizabilities in medium-mass calcium isotopes.

    Comments:
    Proceeding of "Nuclear Structure and Dynamics - NSD 2024". Summitted to EPJ Web of Conferences
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2410.19511 [pdf]
    EPJ Web Conf.(2025)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE