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Nuclear Theory·nucl-th

Monday·September 26, 2016

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 23 Sept 2016]

    Electromagnetic transitions in multiple chiral doublet bands

    Hui Jia · Bin Qi · Shou-Yu Wang · Shuo Wang · Chen Liu

    Multiple chiral doublet bands (MD) in the , 130 and mass regions are studied by the model of =90 triaxial rotor coupled with identical symmetric proton-neutron configurations. By selecting the suitable basis, the calculated wave functions are explicitly exhibited to be symmetric under the operator , which is defined as rotation by about 3-axis with the exchange of valance proton and neutron. We found that both and transitions are allowed between the levels with different values of , while are forbidden between the levels with same values of . Such a selection rule holds true for MD in different mass regions.

    Comments:
    16 pages, 3 figures in Chinese Physics C 2016
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.07260 [pdf]
    CPC(2016)·9 citations
  2. 02

    [Submitted on 23 Sept 2016]

    Applicability of pion-nucleus Drell-Yan data in global analysis of nuclear parton distribution functions

    Petja Paakkinen🇫🇮 · Kari J. Eskola🇫🇮 · Hannu Paukkunen🇫🇮

    Despite the success of modern nuclear parton distribution functions (nPDFs) in describing nuclear hard-process data, they still suffer from large uncertainties. One of the poorly constrained features is the possible asymmetry in nuclear modifications of valence and quarks. We study the possibility of using pion-nucleus Drell-Yan dilepton data as a new constraint in the global analysis of nPDFs. We find that the nuclear cross-section ratios from the NA3, NA10 and E615 experiments can be used without imposing significant new theoretical uncertainties and, in particular, that these datasets may have some constraining power on the / -asymmetry in nuclei.

    Comments:
    6 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1609.07262 [pdf]
    PLB(2017)·13 citations
  3. 03

    [Submitted on 23 Sept 2016]

    Sensitivity of (d,p) reactions to high n-p momenta and the consequences for nuclear spectroscopy studies

    G.W. Bailey · N.K. Timofeyuk · J.A. Tostevin

    Theoretical models of low-energy (d,p) single-neutron transfer reactions are a crucial link between experimentation, nuclear structure and nuclear astrophysical studies. Whereas reaction models that use local optical potentials are insensitive to short-range physics in the deuteron, we show that including the inherent nonlocality of the nucleon-target interactions and realistic deuteron wave functions generates significant sensitivity to high n-p relative momenta and to the underlying nucleon-nucleon interaction. We quantify this effect upon the deuteron channel distorting potentials within the framework of the adiabatic deuteron breakup model. The implications for calculated (d,p) cross sections and spectroscopic information deduced from experiments are discussed.

    Comments:
    5 pages, accepted for publication by Phys. Rev. Lett
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1609.07303 [pdf]
    PRL(2016)·26 citations
  4. 04

    [Submitted on 23 Sept 2016]

    Shear viscosity of nuclear matter

    A.G. Magner · M.I. Gorenstein · U.V. Grygoriev · V.A. Plujko

    Shear viscosity is calculated for the nuclear matter described as a system of interacting nucleons with the van der Waals (VDW) equation of state. The Boltzmann-Vlasov kinetic equation is solved in terms of the plane waves of the collective overdamped motion. In the frequent-collision regime, the shear viscosity depends on the particle-number density through the mean-field parameter , which describes attractive forces in the VDW equation. In the temperature region ~MeV, a ratio of the shear viscosity to the entropy density is smaller than 1 at the nucleon number density , where fm is the particle density of equilibrium nuclear matter at zero temperature. A minimum of the ratio takes place somewhere in a vicinity of the critical point of the VDW system. Large values of are, however, found in both the low-density, , and high-density, , regions. This makes the ideal hydrodynamic approach inapplicable for these densities.

    Comments:
    12 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.07453 [pdf]
    PRC(2016)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE