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Nuclear Theory·nucl-th

Friday·July 31, 2015

6 papers—1 primary·5 cross-listed

All6Primary1Cross-lists5
  1. 01

    [Submitted on 30 Jul 2015]

    Dynamics of quasifission

    A.S. Umar · V.E. Oberacker · C. Simenel

    Quasifission is the primary reaction mechanism that limits the formation of superheavy nuclei and consequently an important ingredient for choosing the best target-projectile combinations for the heavy element searches. Quasifission is characterized by nuclear contact-times that are much longer than those found in deep-inelastic reactions, resulting in a substantial mass and charge transfer. In this manuscript we employ the fully microscopic time-dependent Hartree-Fock (TDHF) theory to study quasifission. New results are presented for the Ca+Bk system.

    Comments:
    Submitted as AIP Conference Proceeings for NSD2015, Portoroz, Slovenia
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1507.08524 [pdf]
    AIP Conf.Proc.(2015)·0 citations
  2. 02

    [Submitted on 16 Jul 2015] (cross-list from hep-lat)

    Net baryon number fluctuations across the chiral phase transition at finite density in the strong coupling lattice QCD

    Terukazu Ichihara🇯🇵 · Kenji Morita🇯🇵 · Akira Ohnishi🇯🇵

    We investigate the net-baryon number fluctuations across the chiral phase transition at finite density in the strong coupling and chiral limit. Mesonic field fluctuations are taken into account by using the auxiliary field Monte-Carlo method. We find that the higher-order cumulant ratios, and , show oscillatory behavior around the phase boundary at , and there exists the region where the higher-order cumulant ratios are negative. The negative region of is found to shrink with increasing lattice size. This behavior agrees with the expectations from the scaling analysis.

    Comments:
    16 pages, 5 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1507.04527 [pdf]
    PTEP(2015)·14 citations
  3. 03

    [Submitted on 29 Jul 2015] (cross-list from hep-ph)

    Heavy flavor dibaryons

    T.F. Carames🇪🇸 · A. Valcarce🇪🇸

    We study the two-baryon system with two units of charm looking for the possible existence of a loosely bound state resembling the dibaryon. We make use of a chiral constituent quark model tuned in the description of the baryon and meson spectra as well as the interaction. The presence of the heavy quarks makes the interaction simpler than in light baryon systems. We analyze possible quark-Pauli effects that would be present in spin-isospin saturated channels. Our results point to the non-existence of a charmed -like dibaryon, although it may appear as a resonance above the threshold.

    Comments:
    13 pages, 6 figures. To appear in Phys. Rev. D. arXiv admin note: text overlap with arXiv:1204.5502, arXiv:1507.08046
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1507.08278 [pdf]
    PRD(2015)·33 citations
  4. 04

    [Submitted on 30 Jul 2015] (cross-list from hep-ph)

    Radial Flow in Non-Extensive Thermodynamics and Study of Particle Spectra at LHC in the Limit of Small

    Trambak Bhattacharyya🇮🇳 · Jean Cleymans🇿🇦 · Arvind Khuntia🇮🇳 · Pooja Pareek🇮🇳 · Raghunath Sahoo🇮🇳

    We expand the Tsallis distribution in a Taylor series of powers of (q-1), where q is the Tsallis parameter, assuming q is very close to 1. This helps in studying the degree of deviation of transverse momentum spectra and other thermodynamic quantities from a thermalized Boltzmann distribution. After checking thermodynamic consistency, we provide analytical results for the Tsallis distribution in the presence of collective flow up to the first order of (q-1). The formulae are compared with the experimental data.

    Comments:
    Replaced with Accepted version in Eur. Phys. J. A
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1507.08434 [pdf]
    EPJA(2016)·90 citations
  5. 05

    [Submitted on 30 Jul 2015] (cross-list from hep-ph)

    -dependence of the lightest meson resonances in QCD

    Neramballi Ripunjay Acharya🇩🇪 · Feng-Kun Guo🇩🇪 · Maxim Mai🇩🇪 · Ulf-G. Meißner🇩🇪

    We derive the pion mass and the elastic pion-pion scattering amplitude in the QCD theta-vacuum up to next-to-leading order in chiral perturbation theory. Using the modified inverse amplitude method, we study the theta-dependence of the mass and width of the light scalar meson sigma(500) and the vector meson rho(770).

    Comments:
    11 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1507.08570 [pdf]
    PRD(2015)·19 citations
  6. 06

    [Submitted on 30 Jul 2015] (cross-list from hep-ph)

    Heavy free energy from hadronic states

    E. Megias🇩🇪 · E. Ruiz Arriola🇪🇸 · L.L. Salcedo🇪🇸

    Within the spirit of the Hadron Resonance Gas model, we study a representation of the heavy free energy at temperatures below the phase transition in terms of the string and heavy-light hadrons. We discuss the string breaking phenomenon and the relevance of avoided crossings between the fundamental string and the hadron spectrum. Good agreement with lattice data is achieved.

    Comments:
    5 pages, 5 figures. Talk given by E.Megias at the 18th International Conference in Quantum Chromodynamics (QCD 15), Montpellier, France, 29 Jun - 3 Jul 2015
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1507.08606 [pdf]
    Nucl.Part.Phys.Proc.(2016)·3 citations

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first authorsco-authorsvia INSPIRE