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Nuclear Theory·nucl-th

Friday·February 6, 2015

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    [Submitted on 5 Feb 2015]

    Charged particle assisted nuclear reactions in solid state environment: renaissance of low energy nuclear physics

    Péter Kálmán · Tamás Keszthelyi

    The features of electron assisted neutron exchange processes in crystalline solids are survayed. It is stated that, contrary to expectations, the cross section of these processes may reach an observable magnitude even in the very low energy case because of the extremely huge increment caused by the Coulomb factor of the electron assisted processes and by the effect of the crystal-lattice. The features of electron assisted heavy charged particle exchange processes, electron assisted nuclear capure processes and heavy charged particle assisted nuclear processes are also overviewed. Experimental observations, which may be related to our theoretical findings, are dealt with. The anomalous screening phenomenon is related to electron assisted neutron and proton exchange processes in crystalline solids. A possible explanation of observations by Fleischmann and Pons is presented. The possibility of the phenomenon of nuclear transmutation is qualitatively explained with the aid of usual and charged particle assisted reactions. The electron assisted neutron exchange processes in pure and composite systems (in the Rossi-type E-Cat) are analyzed and it is concluded that these reactions may be responsible for recent experimental observations.

    Comments:
    arXiv admin note: text overlap with arXiv:1312.5498
    Subjects:
    physics.gen-ph (physics.gen-ph)
    arXiv:
    1502.01474 [pdf]
    0 citations
  2. 02

    [Submitted on 5 Feb 2015]

    Relativistic density functional theory for finite nuclei and neutron stars

    J. Piekarewicz

    The main goal of the present contribution is a pedagogical introduction to the fascinating world of neutron stars by relying on relativistic density functional theory. Density functional theory provides a powerful--and perhaps unique--framework for the calculation of both the properties of finite nuclei and neutron stars. Given the enormous densities that may be reached in the core of neutron stars, it is essential that such theoretical framework incorporates from the outset the basic principles of Lorentz covariance and special relativity. After a brief historical perspective, we present the necessary details required to compute the equation of state of dense, neutron-rich matter. As the equation of state is all that is needed to compute the structure of neutron stars, we discuss how nuclear physics--particularly certain kind of laboratory experiments--can provide significant constrains on the behavior of neutron-rich matter.

    Comments:
    Contributing chapter to the book "Relativistic Density Functional for Nuclear Structure"; World Scientific Publishing Company (Singapore); Editor Prof. Jie Meng (Peking University)
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    1502.01559 [pdf]
    Int.Rev.Nucl.Phys.(2016)·2 citations
  3. 03

    [Submitted on 5 Feb 2015]

    Curvature correction term as a constraint for the Skyrme interaction

    K. V. Cherevko · L. A. Bulavin · L. L. Jenkovszky · V. M. Sysoev · Feng-Shou Zhang

    The curvature correction term to the surface tension is used as a criterion for the efficiency of the Skyrme interaction in describing surface properties. Based on the nuclear equation of state, the curvature correction term to the surface tension coefficient is calculated for 97 standard Skyrme interaction parameter sets in the vicinity of nuclear saturation density at zero temperature. The main idea is to find those parametrizations that give the Tolman's correction close to the available theoretical predictions from the statistical theory. Only 59 out of 97 models give satisfactory results. Comparison of the obtained results with the results of the implementation of different macroscopic and microscopic constraints to Skyrme parametrizations available in the literature allows us to select 4 models that satisfy all the constraints.

    Comments:
    7 pages, 4 figures, 3 appendices
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1502.01606 [pdf]
    PRC(2015)·1 citation
  4. 04

    [Submitted on 5 Feb 2015]

    Description of the proton and neutron radiative capture reactions in the Gamow shell model

    K. Fossez🇫🇷 · N. Michel🇫🇷 · M. Płoszajczak🇫🇷 · Y. Jaganathen🇺🇸 · R.M. Id Betan

    We formulate the Gamow shell model (GSM) in coupled-channel (CC) representation for the description of proton/neutron radiative capture reactions and present the first application of this new formalism for the calculation of cross-sections in mirror reactions 7Be(p,gamma)8B and 7Li(n,gamma)8Li. The GSM-CC formalism is applied to a translationally-invariant Hamiltonian with an effective finite-range two-body interaction. Reactions channels are built by GSM wave functions for the ground state 3/2- and the first excited state 1/2- of 7Be/7Li and the proton/neutron wave function expanded in different partial waves.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1502.01631 [pdf]
    PRC(2015)·47 citations
  5. 05

    [Submitted on 5 Feb 2015]

    The importance of the bulk viscosity of QCD in ultrarelativistic heavy-ion collisions

    S. Ryu🇨🇦 · J.-F. Paquet🇨🇦 · C. Shen🇨🇦 · G. S. Denicol🇨🇦 · B. Schenke🇺🇸 · S. Jeon🇨🇦 · C. Gale🇨🇦

    We investigate the consequences of a nonzero bulk viscosity coefficient on the transverse momentum spectra, azimuthal momentum anisotropy, and multiplicity of charged hadrons produced in heavy ion collisions at LHC energies. The agreement between a realistic 3D hybrid simulation and the experimentally measured data considerably improves with the addition of a bulk viscosity coefficient for strongly interacting matter. This paves the way for an eventual quantitative determination of several QCD transport coefficients from the experimental heavy ion and hadron-nucleus collision programs.

    Comments:
    5 pages, 3 figures. Light modifications to text and figures. To be published in PRL
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1502.01675 [pdf]
    PRL(2015)·425 citations

Affiliations

first authorsco-authorsvia INSPIRE