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Nuclear Theory·nucl-th

Tuesday·February 13, 2018

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 01

    [Submitted on 9 Feb 2018]

    Cosmological Lithium Problems

    C.A. Bertulani · Shubhchintak · A.M. Mukhamedzhanov

    We briefly describe the cosmological lithium problems followed by a summary of our recent theoretical work on the magnitude of the effects of electron screening, the possible existence of dark matter parallel universes and the use of non-extensive (Tsallis) statistics during big bang nucleosynthesis. Solutions within nuclear physics are also discussed and recent measurements of cross-sections based on indirect experimental techniques are summarized.

    Comments:
    9 pages, 5 figures, IX European Summer School on Experimental Nuclear Astrophysics, St. Tecla (Catania), Italy, 17-24/Sept/2017
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1802.03469 [pdf]
    EPJ Web Conf.(2018)·3 citations
  2. 02

    [Submitted on 9 Feb 2018]

    The surface properties of neutron-rich exotic nuclei within relativistic mean field formalisms

    M. Bhuyan · B. V. Carlson · S. K. Patra · Shan-Gui Zhou

    In this theoretical study, we establish a correlation between the neutron skin thickness and the nuclear symmetry energy for the eveneven isotopes of Fe, Ni, Zn, Ge, Se and Kr within the framework of the axially deformed self-consistent relativistic mean field for the non-linear NL3 and density-dependent DD-ME1 interactions. The coherent density functional method is used to formulate the symmetry energy, the neutron pressure and the curvature of finite nuclei as a function of the nuclear radius. We have performed broad studies for the mass dependence on the symmetry energy in terms of the neutron-proton asymmetry for mass 70 A 96. From this analysis, we found a notable signature of a shell closure at = 50 in the isotopic chains of Fe, Ni, Zn, Ge, Se and Kr nuclei. The present study reveals an interrelationship between the characteristics of infinite nuclear matter and the neutron skin thickness of finite nuclei

    Comments:
    13 Pages, 07 Figures, and 03 Tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1802.03476 [pdf]
    PRC(2018)·62 citations
  3. 03

    [Submitted on 10 Feb 2018]

    Real-time evolution method and its application to 3 cluster system

    R. Imai · T. Tada · M. Kimura

    A new theoretical method is proposed to describe the ground and excited cluster states of atomic nuclei. The method utilizes the equation-of-motion of the Gaussian wave packets to generate the basis wave functions having various cluster configurations. The generated basis wave functions are superposed to diagonalize the Hamiltonian. In other words, this method uses the real time as the generator coordinate. The application to the system as a benchmark shows that the new method works efficiently and yields the result consistent with or better than the other cluster models. Brief discussion on the structure of the excited and states is also made.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1802.03523 [pdf]
    PRC(2019)·26 citations
  4. 04

    [Submitted on 12 Feb 2018]

    Isospin Conservation in Neutron Rich Systems of Heavy Nuclei

    Ashok Kumar Jain · Swati Garg

    It is generally believed that isospin would diminish in its importance as we go towards heavy mass region due to isospin mixing caused by the growing Coulomb forces. However, it was realized quite early that isospin could become an important and useful quantum number for all nuclei including heavy nuclei due to neutron richness of the systems~\cite{robson}. Lane and Soper~\cite{lane} also showed in a theoretical calculation that isospin indeed remains quite good in heavy mass neutron rich systems. In this paper, we present isospin based calculations~\cite{jain,swati} for the fission fragment distributions obtained from heavy-ion fusion fission reactions. We discuss in detail the procedure adopted to assign the isospin values and the role of neutron multiplicity data in obtaining the total fission fragment distributions. We show that the observed fragment distributions can be reproduced rather reasonably well by the calculations based on the idea of conservation of isospin. This is probably the very first direct experimental evidence of the validity of isospin in heavy nuclei, which arises largely due to the neutron-rich nature of heavy nuclei and their fragments. This result may eventually become useful for the theories of nuclear fission and also in other practical applications.

    Comments:
    4 pages, 3 figures, Invited Talk at 16th International Symposium on Capture Gamma Ray Spectroscopy and Related Topics (CGS16), Shanghai Jiao Tong University, China and accepted in EPJ Web of Conferences
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1802.03895 [pdf]
    EPJ Web Conf.(2018)·4 citations
  5. 05

    [Submitted on 12 Feb 2018]

    Exploring the decay probability of neutron-rich superheavy nuclei

    M. Bhuyan · B. V. Carlson

    The modes of decay for the even-even isotopes of superheavy nuclei of Z = 118 and 120 with neutron number are investigated in the framework of the axially deformed relativistic mean field model. The asymmetry parameter and the relative neutron-proton asymmetry of the surface to the center () are estimated for the ground state density distributions of the nuclei. We suggest that the resulting asymmetry parameter and the relative neutron-proton asymmetry of the density play a crucial role in the preformation factor of the decay half life.

    Comments:
    04 Pages, 03 Figure, 02 Tables and Poster presented at the XIV International Workshop on Hadron Physics, Florianopolis, Brazil, March 2018
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1802.04130 [pdf]
    0 citations
  6. 06

    [Submitted on 12 Feb 2018]

    On the nature of the shape coexistence and the quantum phase transition phenomena: lead region and Zr isotopes

    J.E. García-Ramos · K. Heyde

    The goal of this contribution is to analyze the connection between shape coexistence and quantum phase transition, two seemingly unrelated phenomena that share common aspects, namely, the rapid change in the ground state structure along an isotope chain or the presence of several minima at the mean-field level. To illustrate the similarities and differences between both phenomena, we will focus in the Pb region, in particular in Pt and Hg isotopes, as well as in Zr isotopes.

    Comments:
    To be published in the CGS16 (Shanghai, China) conference proceedings
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1802.04219 [pdf]
    EPJ Web Conf.(2018)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE