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Nuclear Theory·nucl-th

Wednesday·March 9, 2016

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 01

    [Submitted on 7 Mar 2016]

    Nucleon-deuteron scattering using the adiabatic projection method

    Serdar Elhatisari🇩🇪 · Dean Lee🇺🇸 · Ulf-G. Meißner🇩🇪 · Gautam Rupak🇺🇸

    In this paper we discuss the adiabatic projection method, a general framework for scattering and reaction calculations on the lattice. We also introduce several new techniques developed to study nucleus-nucleus scattering and reactions on the lattice. We present technical details of the method for large-scale problems. To estimate the systematic errors of the calculations we consider simple two-particle scattering on the lattice. Then we benchmark the accuracy and efficiency of the numerical methods by applying these to calculate fermion-dimer scattering in lattice effective field theory with and without a long-range Coulomb potential. The fermion-dimer calculations correspond to neutron-deuteron and proton-deuteron scattering in the spin-quartet channel at leading order in the pionless effective field theory.

    Comments:
    26 pages, 17 figures, and 1 table; version published in EPJA
    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Lattice (hep-lat)
    arXiv:
    1603.02333 [pdf]
    EPJA(2016)·41 citations
  2. 02

    [Submitted on 7 Mar 2016]

    Evolution to the Quark-Gluon Plasma

    Kenji Fukushima🇯🇵

    Theoretical studies on the early-time dynamics in the ultra-relativistic heavy-ion collisions are reviewed including pedagogical introductions on the initial condition with small-x gluons treated as a color glass condensate, the bottom-up thermalization scenario, plasma/glasma instabilities, basics of some formulations such as the kinetic equations and the classical statistical simulation. More detailed discussions follow to make an overview of recent developments on the fast isotropization, the onset of hydrodynamics, and the transient behavior of momentum spectral cascades.

    Comments:
    46 pages, submitted to RoPP Key Issue Review; references added for early works related to aHydro, typos corrected
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1603.02340 [pdf]
    Rept.Prog.Phys.(2017)·42 citations
  3. 03

    [Submitted on 8 Mar 2016]

    Probing nuclear bubble configuration by the ratio in heavy-ion collisions

    Gao-Chan Yong

    It is theoretically and experimentally argued that there may exist bubble or toroid-shaped configurations in some nucleus systems. Based on the nuclear transport model, it is shown that compared with the collision of normal nuclei, there is a depletion of central density of compression with bubble configurations in projectile and target nuclei. This depletion of central compression density may affect some observables in heavy-ion collisions.

    Comments:
    5 pages, 6 figures, accepted by European Physical Journal A
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1603.02364 [pdf]
    EPJA(2016)·8 citations
  4. 04

    [Submitted on 8 Mar 2016]

    -nucleus potentials from -nucleon amplitudes

    E. Friedman

    Optical potentials for -nucleus interactions are constructed from -nucleon amplitudes using recently developed algorithm based on -N kinematics in the nuclear medium. With the deep penetration of mesons into the nucleus at momenta below 800~MeV/c it is possible to test this approach with greater sensitivity than hitherto done with and pions. The energy-dependence of experimental reaction and total cross sections on nuclei is better reproduced with this approach compared to fixed-energy amplitudes. The inclusion of Pauli correlations in the medium also improves the agreement between calculation and experiment. The absolute scale of the cross sections is reproduced very well for Li but for C, Si and Ca calculated cross sections are (23)\% smaller than experiment, in agreement with earlier analyses. Two phenomenological models that produce such missing strength suggest that the imaginary part of the potential needs about 40\% enhancement.

    Comments:
    15 pages, 6 figures, to appear in Nucl. Phys. A
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1603.02451 [pdf]
    NPA(2016)·4 citations
  5. 05

    [Submitted on 8 Mar 2016]

    Challenges in Nuclear Structure Theory

    Witold Nazarewicz🇺🇸

    The goal of nuclear structure theory is to build a comprehensive microscopic framework in which properties of nuclei and extended nuclear matter, and nuclear reactions and decays can all be consistently described. Due to novel theoretical concepts, breakthroughs in the experimentation with rare isotopes, increased exchange of ideas across different research areas, and the progress in computer technologies and numerical algorithms, nuclear theorists have been quite successful in solving various bits and pieces of the nuclear many-body puzzle and the prospects are exciting. This article contains a brief, personal perspective on the status of the field.

    Comments:
    16 pages, 7 figures, Appeared in J. Phys. G Focus Issue on 40 years of research in Journal of Physics G
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1603.02490 [pdf]
    J.Phys.G(2016)·31 citations
  6. 06

    [Submitted on 8 Mar 2016]

    A systematic study of the initial state in heavy ion collisions based on the quark participant assumption

    Liang Zheng🇨🇳 · Zhongbao Yin🇨🇳

    We investigate the initial state geometric quantities of heavy ion collisions based on the quark participant assumption in the Glauber multiple scattering approach. A systematic comparison to the nucleon participant assumption has been presented and confronted with the charged multiplicity measurements in various collision systems. It is found that the quark participant based assumption can be important to understand the data in multiplicity production and the initial spatial eccentricity in small systems.

    Comments:
    7 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1603.02515 [pdf]
    EPJA(2016)·23 citations
  7. 07

    [Submitted on 8 Mar 2016]

    The link between rare earth peak formation and the astrophysical site of the process

    M. R. Mumpower · G. C. McLaughlin · R. Surman · A. W. Steiner

    The primary astrophysical source of the rare earth elements is the rapid neutron capture process ( process). The rare earth peak that is seen in the solar -process residuals has been proposed to originate as a pile-up of nuclei during the end of the process. We introduce a new method utilizing Monte Carlo studies of nuclear masses in the rare earth region, that includes self-consistently adjusting -decay rates and neutron capture rates, to find the mass surfaces necessary for the formation of the rare earth peak. We demonstrate our method with two types of astrophysical scenarios, one corresponding conditions typical of core-collapse supernova winds and one corresponding to conditions typical of the ejection of the material from the tidal tails of neutron star mergers. In each type of astrophysical conditions, this method successfully locates a region of enhanced stability in the mass surface that is responsible for the rare earth peak. For each scenario, we find that the change in the mass surface has qualitatively different features, thus future measurements can shed light on the type of environment in which the process occurred.

    Comments:
    5 pages, 4 figures, submitted
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    1603.02600 [pdf]
    ApJ(2016)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE