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Nuclear Theory·nucl-th

Wednesday·March 30, 2016

15 papers—6 primary·9 cross-listed

All15Primary6Cross-lists9
  1. 01

    [Submitted on 29 Mar 2016]

    Sensitivity of elements of the symmetry energy of nuclear matter to the properties of neutron-rich systems

    C. Mondal · B. K. Agrawal · J. N. De · S. K. Samaddar

    The sensitivity of nuclear symmetry energy elements at the saturation density to the binding energies of ultra neutron-rich nuclei (neutron to proton ratio 2) and the maximum mass of neutron star is explored within a relativistic mean field model. Values of the interaction parameters governing the isovector strengths and the symmetry elements are determined in tighter bounds. Assessments based on the sensitivity matrix reveal that the properties of extreme neutron-rich systems play a predominant role in narrowing down the uncertainties in the various symmetry energy parameters. The calculations are extended over a wide range of nuclear matter density and the results are discussed.

    Comments:
    9 pages, 7 figures (Accepted in Physical Review C)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1603.08645 [pdf]
    PRC(2016)·43 citations
  2. 02

    [Submitted on 29 Mar 2016]

    Deuteron Stripping on Nuclei at Intermediate Energies

    V. I. Kovalchuk

    A general analytical expression for the double differential cross section of inclusive deuteron stripping reaction on nuclei at intermediate energies of incident particles was obtained in the diffraction approximation. Nucleon-nucleus phases were calculated in the framework of Glauber formalism and making use of the double-folding potential. The exact wave function of deuteron with correct asymptotics at short and long distances between nucleons was used. The calculated angular dependencies of cross sections are in good agreement with corresponding experimental data.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1603.08656 [pdf]
    NPA(2015)·6 citations
  3. 03

    [Submitted on 29 Mar 2016]

    Rapidity fluctuations in the initial state

    Wojciech Broniowski🇵🇱 · Piotr Bozek🇵🇱

    We analyze two-particle pseudorapidity correlations in a simple model, where strings of fluctuating length are attached to wounded nucleons.The obtained straightforward formulas allow us to understand the anatomy of the correlations, i.e., to identify the component due to the fluctuation of the number of wounded nucleons and the contribution from the string length fluctuations. Our results reproduce qualitatively and semiquantitatively the basic features of the recent correlation measurements at the LHC.

    Comments:
    10 pages, 3 figures, talk presented by WB at XI Workshop on Particle Correlations and Femtoscopy, Warsaw U. of Technology, 3-7 November 2015
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1603.08676 [pdf]
    Acta Phys.Polon.Supp.(2016)·3 citations
  4. 04

    [Submitted on 29 Mar 2016]

    Asymptotics of phase and wave functions

    V.I. Zhaba

    For single and twochannel nucleon-nucleon scattering the asymptotic form of the phase function for r->0 were taken into account for the asymptotic behavior of the wave function. Asymptotics of the wave function will not r^(l+1), and will have a more complex view and be also determined by the behavior of the potential near the origin. Have examined the cases for nonsingular (weakly singular) and strongly singular potentials. Were the numerical calculations of phase, amplitude and wave functions for the nucleon-nucleon potential Argonne v18. Considered 1S0-, 3P0-, 3P1- states of the np- system.

    Comments:
    6 pages, in Ukrainian, 3 figures, 1 table
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1603.08738 [pdf]
    0 citations
  5. 05

    [Submitted on 29 Mar 2016]

    Fission fragment charge and mass distributions in 239Pu(n,f) in the adiabatic nuclear energy density functional theory

    D. Regnier · N. Dubray · N. Schunck · M. Verriere

    Accurate knowledge of fission fragment yields is an essential ingredient of numerous applications ranging from the formation of elements in the r-process to fuel cycle optimization for nuclear energy. The need for a predictive theory applicable where no data is available is an incentive to develop a fully microscopic approach to fission dynamics. In this work, we calculate the pre-neutron emission charge and mass distributions of the fission fragments formed in the neutron-induced fission of 239Pu using a microscopic method based on nuclear energy density functional (EDF) method, where large amplitude collective motion is treated adiabatically using the time dependent generator coordinate method (TDGCM) under the Gaussian overlap approximation (GOA). Fission fragment distributions are extracted from the flux of the collective wave packet through the scission line. We find that the main characteristics of the fission charge and mass distributions can be well reproduced by existing energy functionals even in two-dimensional collective spaces. Theory and experiment agree typically within 2 mass units for the position of the asymmetric peak. As expected, calculations are sensitive to the structure of the initial state and the prescription for the collective inertia. We emphasize that results are also sensitive to the continuity of the collective landscape near scission. Our analysis confirms that the adiabatic approximation provides an effective scheme to compute fission fragment yields. It also suggests that, at least in the framework of nuclear DFT, three-dimensional collective spaces may be a prerequisite to reach 10% accuracy in predicting pre-neutron emission fission fragment yields.

    Comments:
    10 figures, 3 tables; submitted to Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1603.08824 [pdf]
    PRC(2016)·128 citations
  6. 06

    [Submitted on 13 Dec 2015]

    Multiplicity predictions for Pb-Pb collisions at TeV based on the MC Modified Glauber model

    Andrey Seryakov🇷🇺 · Grigory Feofilov🇷🇺

    We present predictions of the mean multiplicity yields for different centrality classes of Pb-Pb collisions at TeV at the LHC, obtained using the Monte-Carlo Modified Glauber model (MGM) [1]. Contrary to generally used standard Glauber calculations, the MGM takes into account the energy conservation in the soft particles production. The only one efficient model parameter was tuned and fixed previously (k=0.35) by fitting the available data on multiplicity for all colliding systems up to RHIC energies. The MGM has shown already a good predictive capability for the yields at TeV, and it is used again within the same MC code for the calculations at TeV

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1603.08825 [pdf]
    1 citation

Affiliations

first authorsco-authorsvia INSPIRE