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Nuclear Theory·nucl-th

Thursday·November 14, 2019

11 papers—8 primary·3 cross-listed

All11Primary8Cross-lists3
  1. 09

    [Submitted on 12 Nov 2019] (cross-list from hep-ph)

    Double inclusive small-x gluon production and their azimuthal correlations in a biased ensemble

    Gary Kapilevich🇺🇸

    We consider double production in the presence of a bias on the unintegrated gluon distribution of the colliding hadron or nuclei. Such bias could be due to the selection of configurations with a greater number of gluons or higher mean transverse momentum squared or, more generally, due to a modified spectral shape of the gluon distribution in the hadrons. Hence, we consider reweighted functional averages over the stochastic ensemble of small-x gluons. We evaluate explicitly the double inclusive gluon transverse momentum spectrum in high-energy collisions, and their azimuthal correlations, for a few simple examples of biases.

    Comments:
    15 pages. Resubmitted 2/20/20, in line with referee comments for upcoming publication to Physics Review D. A paragraph was added at the beginning of the introduction, so to begin the paper with a broader presentation of using biased ensembles to better understand various observables in particle collisions
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1911.05104 [pdf]
    PRD(2020)·1 citation
  2. 10

    [Submitted on 4 Nov 2019] (cross-list from cond-mat.soft)

    Structure of Multicomponent Coulomb Crystals

    M. E. Caplan

    Coulomb plasmas crystallize in a number of physical systems, such as dusty plasmas, neutron star crusts, and white dwarf cores. The crystal structure of the one component and binary plasma has received significant attention in the literature, though the less studied multicomponent plasma may be most relevant for many physical systems which contain a large range of particle charges. We report on molecular dynamics simulations of multicomponent plasmas near the melting temperature with mixtures taken to be realistic X-ray burst ash compositions. We quantify the structure of the crystal with the bond order parameters and radial distribution function. Consistent with past work, low charge particles form interstitial defects and we argue that they are in a quasi-liquid state within the lattice. The lattice shows screening effects which preserves long range order despite the large variance in particle charges which may impact transport properties relevant to astrophysics.

    Comments:
    10 pages, 8 figures, accepted to PRE
    Subjects:
    cond-mat.soft (cond-mat.soft); High Energy Astrophysical Phenomena (astro-ph.HE); cond-mat.mtrl-sci (cond-mat.mtrl-sci); Nuclear Theory (nucl-th)
    arXiv:
    1911.05230 [pdf]
    PRE(2020)·11 citations
  3. 11

    [Submitted on 13 Nov 2019] (cross-list from physics.ins-det)

    Characterization of an electrically cooled BEGe detector till E MeV

    Sathi Sharma · Arkabrata Gupta · Balaram Dey · M. Roy Chowdhury · A. Mandal · A. Bisoi · V. Nanal · L.C. Tribedi · M. Saha Sarkar

    An electrically cooled Broad Energy Germanium (BEGe) detector has been characterized in the energy range E 0.122 - 7 MeV by utilizing the - rays emitted by a short-lived resonance state in O populated through N(p,) reaction and standard radioactive source (Eu). The experimental results have been reproduced through simulations with GEANT4 code, including vendor specified detector geometry along with the detailed construction of the target holder flange, to delineate the effects of the holder at various energies and detector position. Later the efficiency with a bare point source has been simulated. It has been found that the electrically cooled BEGe detector is suitable for usage in the -ray spectroscopy as well as for the study of resonance phenomena in nuclear astrophysics.

    Comments:
    18 pages including 10 figures
    Subjects:
    Instrumentation and Detectors (physics.ins-det); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1911.05304 [pdf]
    Nucl.Instrum.Meth.A(2020)·4 citations

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first authorsco-authorsvia INSPIRE