PaperPanorama
FAQ

Nuclear Theory·nucl-th

Monday·January 6, 2020

3 papers—2 primary·1 cross-listed

All3Primary2Cross-lists1
  1. 01

    [Submitted on 3 Jan 2020]

    Relativistic Mean-Field Approach in Nuclear Systems

    Xiaodong Sun · Ruirui Xu · Yuan Tian · Zhongyu Ma · Zhigang Ge · Hongfei Zhang · E.N.E. van Dalen · H. Muether

    A new scheme to study the properties of finite nuclei is proposed based on the Dirac-Brueckner-Hartree-Fock (DBHF) approach starting from a bare nucleon-nucleon interaction. The relativistic structure of the nucleon self-energies in nuclear matter depending on density, momentum and isospin asymmetry are determined through a subtracted T-matrix technique and parameterized, which makes them easily accessible for general use. The scalar and vector potentials of a single particle in nuclei are generated via a local density approximation (LDA). The surface effect of finite nuclei can be taken into account by an improved LDA (ILDA), which has successfully been applied in microscopic derivations of the optical model potential for nucleon-nucleus scattering. The bulk properties of nuclei can be determined in a self-consistent scheme for nuclei all over the nuclear mass table. Calculated binding energies agree very well with the empirical data, while the predicted values for radii and spin-orbit splitting of single-particle energies are about 10 \% smaller than the experimental data. Basic features of more sophisticated DBHF calculations for finite nuclei are reproduced.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2001.00684 [pdf]
    PRC(2020)·2 citations
  2. 02

    [Submitted on 3 Jan 2020]

    The calculation of the neutrinoless double-beta decay matrix element within the realistic shell model

    L. Coraggio🇮🇹 · A. Gargano🇮🇹 · N. Itaco🇮🇹 · R. Mancino🇮🇹 · F. Nowacki🇫🇷

    We approach the calculation of the nuclear matrix element of the neutrinoless double-beta decay process, considering the light-neutrino-exchange channel, by way of the realistic shell model. To this end, we start from a realistic nucleon-nucleon potential and then derive the effective shell-model Hamiltonian and neutrinoless double-beta decay operator within the many-body perturbation theory. We focus on investigating the perturbative properties of the effective shell-model operator of such a decay process, aiming to establish the degree of reliability of our predictions. The contributions of the so-called short-range correlations and of the correction of Pauli-principle violations to the effective shell-model operator, the latter introduced in many-valence nucleon systems, are also taken into account. The subjects of our study are a few candidates to the neutrinoless double-beta decay detection, in a mass interval ranging from A=48 up to A=136, whose spin- and spin-isospin-dependent decay properties we have studied in previous works. Our results will be finally compared with shell-model calculations for the same set of nuclei.

    Comments:
    13 pages, 15 figures, 1 table, to be published in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2001.00890 [pdf]
    PRC(2020)·112 citations
  3. 03

    [Submitted on 3 Jan 2020] (cross-list from astro-ph.SR)

    Nucleosynthesis of "Light" Heavy Nuclei in Neutrino-driven Winds. Role of () reactions

    Jorge Pereira · Almudena Arcones · Julia Bliss · Fernando Montes

    Neutrino-driven winds following core collapse supernovae have been proposed as a suitable site where the so-called light heavy elements (between Sr to Ag) can be synthetized. For moderately neutron-rich winds, () reactions play a critical role in the weak r process, becoming the main mechanism to drive nuclear matter towards heavier elements. In this paper we summarize the sensitivity of network-calculated abundances to the astrophysical conditions, and to uncertainties in the () reaction rates. A list of few () reactions were identified to dominate the uncertainty in the calculated elemental abundances. Measurements of these reactions will allow to identify the astrophysical conditions of the weak r process by comparing calculated/observed abundances in r-limited stars.

    Subjects:
    Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2001.00924 [pdf]
    J.Phys.Conf.Ser.(2020)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE