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Nuclear Theory·nucl-th

Wednesday·July 12, 2017

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 01

    [Submitted on 11 Jul 2017]

    Phenomenological and Theoretical Optical Potentials

    Carlotta Giusti

    The optical potential is a powerful instrument for calculations on a wide variety of nuclear reactions, in particular, for quasi-elastic lepton-nucleus scattering. Phenomenological optical potentials are successful in the description of data but may produce uncertainties in the interpretation of the results. Two recent theoretical optical potentials are presented: a global relativistic folding optical potential, that has been employed in relativistic models for quasi-elastic lepton-nucleus scattering, and a non relativistic optical potential derived from nucleon-nucleon chiral potentials at fourth order (N4LO), that has been applied to elastic proton-nucleus scattering.

    Comments:
    10 pages 3 figures. Contribution presented at the Workshop "Advanced Aspects of Nuclear Structure and Reactions at Different Energy Scales", 25-28 April 2017, Arbanasi, Bulgaria
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1707.03242 [pdf]
    Bulg.J.Phys.(2017)·0 citations
  2. 02

    [Submitted on 10 Jul 2017] (cross-list from physics.plasm-ph)

    Accelerator Based Fusion Reactor

    Keh-Fei Liu · Alexander Wu Chao

    A feasibility study of fusion reactors based on accelerators is carried out. We consider a novel scheme where a beam from the accelerator hits the target plasma on the resonance of the fusion reaction and establish characteristic criteria for a workable reactor. We consider the reactions , and in this study. The critical temperature of the plasma is determined from overcoming the stopping power of the beam with the fusion energy gain. The needed plasma lifetime is determined from the width of the resonance, the beam velocity and the plasma density. We estimate the critical beam flux by balancing the energy of fusion production against the plasma thermo-energy and the loss due to stopping power for the case of an inert plasma. The product of critical flux and plasma lifetime is independent of plasma density and has a weak dependence on temperature. Even though the critical temperatures for these reactions are lower than those for the thermonuclear reactors, the critical flux is in the range of for the plasma density in the case of an inert plasma. Several approaches to control the growth of the two-stream instability are discussed. We have also considered several scenarios for practical implementation which will require further studies. Finally, we consider the case where the injected beam at the resonance energy maintains the plasma temperature and prolongs its lifetime to reach a steady state. The equations for power balance and particle number conservation are given for this case.

    Comments:
    To be published in Nuclear Fusion as a letter, 7 pages, 2 figures
    Subjects:
    Plasma Physics (physics.plasm-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Accelerator Physics (physics.acc-ph)
    arXiv:
    1707.03043 [pdf]
    Nucl.Fusion(2017)·3 citations
  3. 03

    [Submitted on 11 Jul 2017] (cross-list from hep-ph)

    Centrality dependence of charmed-meson photoproduction in ultrarelativistic heavy ion collisions

    Gong-Ming Yu🇨🇳 · Yan-Bing Cai🇨🇳 · Zhen Bai🇨🇳 · Qiang Hu🇨🇳 · Jian-Song Wang🇨🇳

    We calculate the centrality dependence of inclusive cross section of large-pT charmed-meson (, , , and ) from heavy quark fragmentation by the hard photoproduction processes for the nucleus-nucleus collisions in ultrarelativistic heavy ion collisions. The numerical results indicate that the modification of the hard photoproduction processes cannot be negligible for the charmed-meson production in Au-Au collisions at Relativistic Heavy Ion Collider (RHIC) and Pb-Pb collisions at Large Hadron Collider (LHC).

    Comments:
    5 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1707.03254 [pdf]
    Commun.Theor.Phys.(2019)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE