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Nuclear Theory·nucl-th

Friday·August 27, 2021

13 papers—7 primary·6 cross-listed

All13Primary7Cross-lists6
  1. 01

    [Submitted on 25 Aug 2021]

    Implementation of residual nucleus de-excitations associated with proton decays in based on the GENIE generator and TALYS code

    Hang Hu🇨🇳 · Wan-Lei Guo🇨🇳 · Jun Su🇨🇳 · Wei Wang🇨🇳 · Cenxi Yuan🇨🇳

    We implement the de-excitation processes of residual nuclei associated with proton decays in based on the GENIE generator and TALYS code. To derive the reasonable excitation energy spectra of residual nuclei , and , the default GENIE nucleon decay generator is modified in terms of the Spectral Function nuclear model. Then we use the TALYS code to estimate the de-excitation processes of residual nuclei. The TALYS calculation can partly account for the experimental data.

    Comments:
    9 pages, 8 figures and 7 tables; v3: some discussions added, to appear in Physics Letters B
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2108.11376 [pdf]
    PLB(2022)·8 citations
  2. 02

    [Submitted on 25 Aug 2021]

    Phenomenological study on correlation between flow harmonics and mean transverse momentum in nuclear collisions

    Chunjian Zhang🇺🇸 · Jiangyong Jia🇺🇸 · Shengli Huang🇺🇸

    To assess the properties of the quark-gluon plasma formed in nuclear collisions, the Pearson correlation coefficient between flow harmonics and mean transverse momentum, , reflecting the overlapped geometry of colliding atomic nuclei, is measured. was found to be particularly sensitive to the quadrupole deformation of the nuclei. We study the influence of the nuclear quadrupole deformation on in and collisions at RHIC energy using transport model, and show that the is reduced by the prolate deformation and turns to change sign in ultra-central collisions (UCC).

    Comments:
    Proceedings for the 50th International Symposium on Multiparticle Dynamics, Zurich, Europe, 12-16 July 2021
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2108.11452 [pdf]
    SciPost Phys.Proc.(2022)·0 citations
  3. 03

    [Submitted on 25 Aug 2021]

    Probing the Structure of Deuteron at Very Short Distances

    Frank Vera🇺🇸

    We study the electrodisintegration of deuteron at quasi-elastic kinematics and high transferred momentum as a probe for the short distance structure in nuclei. In this reaction, an electron hits a nucleus of deuterium, which breaks up into a proton-neutron pair. We focus our attention on events where fast nucleons emerge, corresponding to nuclear configurations where the bound nucleons have a high relative momentum (exceeding 700 MeV/c). The present research is relevant to physical systems where high-density nuclear matter is present. This condition covers a wide range of physics, from neutron stars to nuclei stability and the repulsive nuclear core. The present work differs from previous studies in two crucial features. One is the definition of the deuteron wave function, which include terms of a relativistic origin that can be ordered based on their relative contribution to the deuteron's internal momentum distribution. These terms, related to the off-shell properties of the nucleon-nucleon bound-state, do not occur in non-relativistic quantum mechanics. However, they become increasingly important in describing configurations with a high nucleon-nucleon relative momentum. The second difference is that we account for the off-shell nature of the bound nucleon that enters on the definition of the (half-off-shell) electromagnetic current. We avoid many of the difficulties inherent to the relativistic nature of the processes involved by adopting a theoretical framework known as Light Front dynamics. Simultaneous simplifications in the definition of the relativistic wave function for the proton-neutron bound state and the treatment of the (half-off-shell) electromagnetic current for the bound nucleon are among the essential advantages resulting from the use of the Light Front dynamics.

    Comments:
    PhD Thesis in Theoretical Nuclear Physics (Florida International University), 161 pages (excluding (11) initial pages: title, acknowledgment, table of contents, etc.), 29 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2108.11502 [pdf]
    2 citations
  4. 04

    [Submitted on 26 Aug 2021]

    A Systematic Study Of Nuclear Matter: Finite Nuclei To Neutron Star

    Abdul Quddus🇮🇳

    The main aim of the thesis is to study the properties of nuclear matter, i.e., finite nuclei to infinite nuclear matter, at zero and finite temperature within effective field theory motived relativistic mean-field model by using some of the recent parameter sets. For this, we have chosen exotic, superheavy, and natural/neutron-rich thermally fissile nuclei and studied ground as well as excited-state bulk and surface properties of nuclei. We have also tried to figure out the possible constraints on the DM variables by considering WIMP, a DM candidate, inside the NS core and using gravitational-wave data GW170817.

    Comments:
    PhD Thesis
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2108.11593 [pdf]
    0 citations
  5. 05

    [Submitted on 26 Aug 2021]

    Renormalization of NN Chiral EFT, my personal mixed feelings

    D.R. Entem🇪🇸

    We are celebrating thirty-years from the seminal papers from Weinberg proposing to use the rules of Chiral Perturbation Theory to nucleon systems. His proposal was to build an Effective Field Theory (EFT) with Chiral symmetry as a key property. A big effort on this line have been made during these three decades, however the issue of renormalization of the theory is not settled. I will briefly review my path on this issue and give my personal view.

    Comments:
    Contribution to Special Issue of Few-Body Systems: Celebrating 30 years of Steven Weinberg's papers on Nuclear Forces from Chiral Lagrangians
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2108.11672 [pdf]
    Few Body Syst.(2021)·1 citation
  6. 06

    [Submitted on 26 Aug 2021]

    Extraction of the second and fourth radial moments of nuclear charge density from the elastic electron-nucleus scattering

    Jian Liu · Xiaoting Liu · Xuezhi Wang · Shuo Wang · Chang Xu · Zhongzhou Ren

    The expression for the radial moments of the nuclear charge density has been discussed under the plane wave Born approximation (PWBA) method recently, which is significant to investigate the nuclear surface thickness and neutron distribution radius. In this paper, we extend the studies of extracting second-order moment and fourth-order moment from the Coulomb form factors by the distorted wave Born approximation (DWBA) at the small momentum transfer region. Based on the relativistic mean-field (RMF) calculations, the DWBA form factors are expanded into , where the corresponding charge distributions are corrected by the contributions of neutron and spin-orbit densities. In the small region, it is found that the experimental can be well reproduced by considering the contributions of the at the small region. Through further analyzing the second-order and fourth-order expansion coefficients of the , the relationship between the expansion coefficients and proton number is obtained. By the relationship, we extract the and from the limited experimental data of form factors at the small region. Within the permissible range of error, the extracted are consistent with the experimental data in this paper.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2108.11729 [pdf]
    J.Phys.G(2021)·5 citations
  7. 07

    [Submitted on 26 Aug 2021]

    Neutrinoless double-beta decay from an effective field theory for heavy nuclei

    Catharina Brase🇩🇪 · Javier Menéndez🇪🇸 · Eduardo Antonio Coello Pérez🇺🇸 · Achim Schwenk🇩🇪

    We study neutrinoless double-beta decay in an effective field theory (EFT) for heavy nuclei, which are treated as a spherical core coupled to additional neutrons and/or protons. Since the low-energy constants of the EFT cannot be fitted to data for this unobserved decay, we follow an alternative strategy to constrain these through a correlation with double Gamow-Teller transitions. This correlation was recently found to hold for shell-model calculations, energy-density functionals, and other nuclear structure models. We therefore first calculate the nuclear matrix elements for double Gamow-Teller transitions in the EFT for heavy nuclei. The combination of the EFT uncertainty with the correlation uncertainty enables predictions of nuclear matrix elements for neutrinoless double-beta decay for a broad range of isotopes with quantified uncertainties. Generally the EFT predicts smaller nuclear matrix elements compared to other approaches, but our EFT results are consistent with recent ab initio calculations.

    Comments:
    13 pages, 5 figures, 4 tables, minor changes, published version
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2108.11805 [pdf]
    PRC(2022)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE