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Nuclear Theory·nucl-th

Wednesday·August 17, 2016

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 16 Aug 2016]

    Ground State Properties of Neutron Magic Nuclei

    G. Saxena · M. Kaushik

    A systematic study of the ground state properties of the entire chains of even even neutron magic nuclei represented by isotones of traditional neutron magic numbers N = 8, 20, 40, 50, 82 and 126 has been carried out using relativistic mean field (rmf) plus Bardeen Cooper Schrieffer (BCS) approach. Our present investigation includes deformation, binding energy, two proton separation energy, single particle energy, rms radii along with proton and neutron density profiles, etc. Several of these results are compared with the results calculated using non relativistic approach (Skyrme Hartree Fock method) along with available experimental data and indeed they are found with excellent agreement. In addition, the possible locations of the proton and neutron drip lines, the (Z,N) values for the new shell closures, disappearance of traditional shell closures as suggested by the detailed analyzes of results are also discussed in detail.

    Comments:
    26 pages, 11 figures, Accepted in Physics of Atomic Nuclei, 2016
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1608.04505 [pdf]
    Phys.Atom.Nucl.(2017)·7 citations
  2. 02

    [Submitted on 15 Aug 2016]

    Consequences of simultaneous chiral symmetry breaking and deconfinement for the isospin symmetric phase diagram

    Tobias Fischer🇵🇱 · Thomas Klähn🇵🇱 · Matthias Hempel🇨🇭

    The thermodynamic bag model (tdBag) has been applied widely to model quark matter properties in both heavy-ion and astrophysics communities. Several fundamental physics aspects are missing in tdBag, e.g., dynamical chiral symmetry breaking (DSB) and repulsions due to the vector interaction are both included explicitly in the novel vBag quark matter model of Klähn and Fischer (2015) (Astrophys. J. 810, 134 (2015)). An important feature of vBag is the simultaneous DSB and deconfinement, where the latter links vBag to a given hadronic model for the construction of the phase transition. In this article we discuss the extension to finite temperatures and the resulting phase diagram for the isospin symmetric medium.

    Comments:
    6 pages, 2 figures, Contribution to the Topical Issue Exploring strongly interacting matter at high densities - NICA White Paper edited by David Blaschke et al
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1608.04613 [pdf]
    EPJA(2016)·6 citations
  3. 03

    [Submitted on 16 Aug 2016]

    Corrections to nucleon capture cross sections computed in truncated Hilbert spaces

    B. Acharya · A. Ekström · D. Odell · T. Papenbrock · L. Platter

    Nucleon capture cross sections enter various astrophysical processes. The measurement of proton capture on nuclei at astrophysically relevant low energies is a challenge, and theoretical computations in this long-wavelength regime are sensitive to the long-distance asymptotics of the wave functions. A theoretical foundation for estimating and correcting errors introduced in capture cross sections due to Hilbert space truncation has so far been lacking. We derive extrapolation formulas that relate the infrared regularized capture amplitudes to the infinite basis limit and demonstrate their efficacy for proton-proton fusion. Our results are thus relevant to current calculations of few-body capture reactions such as proton-proton fusion or proton capture on the deuteron, and they also open the way for the use of {\it ab initio} many-body wave functions represented in finite Hilbert spaces in precision calculations of nucleon capture on heavier nuclei.

    Comments:
    6 pages, 4 figures, published version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1608.04699 [pdf]
    PRC(2017)·8 citations
  4. 04

    [Submitted on 16 Aug 2016]

    Thermal Effects in Dense Matter Beyond Mean Field Theory

    Constantinos Constantinou · Sudhanva Lalit · Madappa Prakash

    The formalism of next-to-leading order Fermi Liquid Theory is employed to calculate the thermal properties of symmetric nuclear and pure neutron matter in a relativistic many-body theory beyond the mean field level which includes two-loop effects. For all thermal variables, the semi-analytical next-to-leading order corrections reproduce results of the exact numerical calculations for entropies per baryon up to 2. This corresponds to excellent agreement down to sub-nuclear densities for temperatures up to MeV. In addition to providing physical insights, a rapid evaluation of the equation of state in the homogeneous phase of hot and dense matter is achieved through the use of the zero-temperature Landau effective mass function and its derivatives.

    Comments:
    24 pages, 11 figures, Contribution to Gerry Brown's 90th Birthday Memorial Book
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1608.04713 [pdf]
    IJMPE(2017)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE