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Nuclear Theory·nucl-th

Thursday·December 21, 2017

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 20 Dec 2017]

    Influence of the nuclear matter equation of state on the r-mode instability using the finite-range simple effective interaction

    S. P. Pattnaik🇮🇳 · T. R. Routray🇮🇳 · X. Viñas🇪🇸 · D. N. Basu🇮🇳 · M. Centelles🇪🇸 · K. Madhuri🇮🇳 · B. Behera🇮🇳

    The characteristic physical properties of rotating neutron stars under the r-mode oscillation are evaluated using the finite-range simple effective interaction. Emphasis is given on examining the influence of the stiffness of both the symmetric and asymmetric parts of the nuclear equation of state on these properties. The amplitude of the r-mode at saturation is calculated using the data of particular neutron stars from the considerations of "spin equilibrium" and "thermal equilibrium". The upper limit of the r-mode saturation amplitude is found to lie in the range 10^{-8}-10^{-6}, in agreement with the predictions of earlier work.

    Comments:
    28 pages, 7 figures, 5 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    1712.07273 [pdf]
    J.Phys.G(2018)·15 citations
  2. 02

    [Submitted on 20 Dec 2017]

    Short-range correlation in high-momentum antisymmetrized molecular dynamics

    Takayuki Myo

    We propose a new variational method for treating short-range repulsion of bare nuclear force for nuclei in antisymmetrized molecular dynamics (AMD). In AMD, the short-range correlation is described in terms of large imaginary centroids of Gaussian wave packets of nucleon pairs in opposite signs, causing high-momentum components in nucleon pair. We superpose these AMD basis states and name this method "high-momentum AMD" (HM-AMD), which is capable of describing strong tensor correlation (Prog. Theor. Exp. Phys. (2017) 111D01). In this paper, we extend HM-AMD by including up to two kinds of nucleon pairs in each AMD basis state utilizing the cluster expansion, which produces many-body correlations involving high-momentum components. We investigate how much HM-AMD describes the short-range correlation by showing the results for H using the Argonne V4 central potential. It is found that HM-AMD reproduces the results of few-body calculations and also the tensor-optimized AMD. This means that HM-AMD is a powerful approach to describe the short-range correlation in nuclei. In HM-AMD, momentum directions of nucleon pairs isotropically contribute to the short-range correlation, which is different from the tensor correlation.

    Comments:
    11 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1712.07457 [pdf]
    PTEP(2018)·17 citations
  3. 03

    [Submitted on 20 Dec 2017]

    On the widths and binding energies of nuclear states and the role of multi-nucleon interactions

    J. Hrtankova🇨🇿 · J. Mares🇨🇿

    We report on our recent self-consistent calculations of nuclear quasi-bound states using optical potentials derived from chirally motivated meson-baryon coupled channels models [1,2]. The single-nucleon potentials were supplemented by a phenomenological multi-nucleon interaction term introduced to achieve good fits to atom data. We demonstrate a substantial impact of the multi-nucleon absorption on the widths of nuclear states. If such states ever exist in nuclear many-body systems, their widths are excessively large to allow observation.

    Comments:
    9 pages, 5 figures, proceedings of the EXA2017 conference, Vienna, Austria, September 11 - 15, 2017
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1712.07477 [pdf]
    EPJ Web Conf.(2018)·0 citations
  4. 04

    [Submitted on 20 Dec 2017]

    Medium effects on freeze-out of light clusters at NICA energies

    G. Roepke🇩🇪 · D. Blaschke🇷🇺 · Yu. B. Ivanov🇷🇺 · Iu. Karpenko🇫🇷 · O. V. Rogachevsky🇷🇺 · H. H. Wolter🇩🇪

    We estimate the chemical freeze-out of light nuclear clusters for NICA energies of above 2 A GeV. On the one hand we use results from the low energy domain of about 35 A MeV, where medium effects have been shown to be important to explain experimental results. On the high energy side of LHC energies the statistical model without medium effects has provided results for the chemical freeze-out. The two approaches extrapolated to NICA energies show a discrepancy that can be attributed to medium effects and that for the deuteron/proton ratio amounts to a factor of about three. These findings underline the importance of a detailed investigation of light cluster production at NICA energies.

    Comments:
    10 pages, 4 figures, accepted for publication in Phys. Part. Nucl. Lett; typo in Eq. (6) corrected in v2
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1712.07645 [pdf]
    Phys.Part.Nucl.Lett.(2018)·11 citations

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first authorsco-authorsvia INSPIRE