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Nuclear Theory·nucl-th

Wednesday·October 14, 2015

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 01

    [Submitted on 13 Oct 2015]

    An R-matrix package for coupled-channel problems in nuclear physics

    P. Descouvemont

    We present an -matrix Fortran package to solve coupled-channel problems in nuclear physics. The basis functions are chosen as Lagrange functions, which permits simple calculations of the matrix elements. The main input are the coupling potentials at some nucleus-nucleus distances, specified by the program. The program provides the collision matrix and, optionally, the associated wave function. The present method deals with open and closed channels simultaneously, without numerical instability associated with closed channels. It can also solve coupled-channel problems for non-local potentials. Long-range potentials can be treated with propagation techniques, which significantly speed up the calculations. We first present an overview of the -matrix theory, and of the Lagrange-mesh method. A description of the package and its installation on a UNIX machine is then provided. Finally, five typical examples are discussed.

    Comments:
    28 pages, 6 figures, accepted for publication at Computer Physics Communications
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.03540 [pdf]
    Comput.Phys.Commun.(2016)·54 citations
  2. 02

    [Submitted on 13 Oct 2015]

    Light (anti-)nuclei production and flow in relativistic heavy-ion collisions

    Lilin Zhu🇨🇳 · Che Ming Ko🇺🇸 · Xuejiao Yin🇨🇳

    Using the coalescence model based on the phase-space distributions of protons, neutrons, Lambdas and their antiparticles from a multiphase transport (AMPT) model, we study the production of deuteron, triton, helium 3, hypertriton, hyperhelium 3 and their antinuclei in Pb+Pb collisions at TeV. The resulting transverse momentum spectra, elliptic flows and coalescence parameters for these nuclei are presented and compared with available experimental data. We also show the constituent number scaled elliptic flows of these nuclei and discuss their implications.

    Comments:
    7 pages, 4figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1510.03568 [pdf]
    PRC(2015)·81 citations
  3. 03

    [Submitted on 13 Oct 2015]

    Time-dependent density functional studies of nuclear quantum dynamics in large amplitudes

    Kai Wen🇯🇵 · Kouhei Washiyama🇯🇵 · Ni Fang🇯🇵 · Takashi Nakatsukasa🇯🇵

    The time-dependent density functional theory (TDDFT) provides a unified description of the structure and reaction. The linear approximation leads to the random-phase approximation (RPA) which is capable of describing a variety of collective motion in a harmonic regime. Beyond the linear regime, we present applications of the TDDFT to nuclear fusion and fission reaction. In particular, the extraction of the internuclear potential and the inertial mass parameter is performed using two different methods. A fusion hindrance mechanism for heavy systems is investigated from the microscopic point of view. The canonical collective variables are determined by the adiabatic self-consistent collective coordinate method. Preliminary results of the spontaneous fission path, the potential, and the collective mass parameter are shown for 8Be --> alpha+alpha.

    Comments:
    Invited talk presented at XXII Nuclear Physics Workshop "Marie & Pierre Curie", Kazimierz, Poland, September 22-27, 2015
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.03612 [pdf]
    Acta Phys.Polon.Supp.(2015)·0 citations
  4. 04

    [Submitted on 13 Oct 2015]

    Open heavy-flavor production and suppression in heavy-ion collisions

    Marlene Nahrgang🇺🇸

    Heavy-flavor observables are valuable probes of the quark-gluon plasma, which is expected to be produced in ultrarelativistic heavy-ion collisions. These experiments offer the unique opportunity to study strongly interacting matter at high temperatures and densities in the laboratory. In this overview talk I will summarize the current theoretical status of heavy-flavor production and suppression in heavy-ion collisions and discuss open challenges.

    Comments:
    To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22 May 2015
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.03627 [pdf]
    3 citations
  5. 05

    [Submitted on 13 Oct 2015]

    Surface corrections to the moment of inertia and shell structure in finite Fermi systems

    D.V. Gorpinchenko🇺🇦 · A.G. Magner🇺🇦 · J. Bartel🇫🇷 · J.P. Blocki🇵🇱

    The moment of inertia for nuclear collective rotations is derived within a semiclassical approach based on the Inglis cranking and Strutinsky shell-correction methods, improved by surface corrections within the nonperturbative periodic-orbit theory. For adiabatic (statistical-equilibrium) rotations it was approximated by the generalized rigid-body moment of inertia accounting for the shell corrections of the particle density. An improved phase-space trace formula allows to express the shell components of the moment of inertia more accurately in terms of the free-energy shell correction. Evaluating their ratio within the extended Thomas-Fermi effective-surface approximation, one finds good agreement with the quantum calculations.

    Comments:
    9 pages,4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.03756 [pdf]
    PRC(2016)·4 citations
  6. 06

    [Submitted on 13 Oct 2015]

    Theoretical corrections and world data for the superallowed ft values in the beta decays of 42Ti, 46Cr, 50Fe and 54Ni

    I.S. Towner · J.C. Hardy

    Prompted by recent measurements, we have surveyed world data and calculated radiative and isospin-symmetry breaking corrections for the superallowed 0+ -to- 0+ Fermi transitions from 42Ti, 46Cr, 50Fe and 54Ni. This increases the number of such transition with a complete set of calculated corrections from 20 to 23. The results are compared with their equivalents for the mirror superallowed transitions from 42Sc, 46V, 50Mn and 54Co. The predicted ft-value asymmetries of these mirror pairs are sensitive to the correction terms and provide motivation for improving measurement precision so as to be able to test the corrections. To aid in that endeavor, we present a parameterization for calculating the f values for the new transitions to plus/minus 0.01%.

    Comments:
    10 pages
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1510.03793 [pdf]
    PRC(2015)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE