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Nuclear Theory·nucl-th

Monday·October 19, 2015

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 16 Oct 2015]

    Strong-interaction isospin-symmetry breaking within the density functional theory

    Pawel Baczyk🇵🇱 · Jacek Dobaczewski🇵🇱 · Maciej Konieczka🇵🇱 · Wojciech Satula🇵🇱

    The conventional Skyrme interaction is generalized by adding zero-range charge-symmetry-breaking and charge-independence-breaking terms, and the corresponding energy density functional is derived. It is shown that the extended model accounts for experimental values of mirror and triplet displacement energies (MDEs and TDEs) in sd-shell isospin triplets with, on average, about 100~keV precision using only two additional adjustable coupling constants. Moreover, the model is able to reproduce, for the first time, the A=4n versus A=4n+2 staggering of the TDEs.

    Comments:
    talk presented at the XXII Nuclear Physics Workshop, Kazimierz Dolny, Poland, September 22-27, 2015
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.04831 [pdf]
    Acta Phys.Polon.Supp.(2015)·5 citations
  2. 02

    [Submitted on 16 Oct 2015]

    Deuteron electrodisintegration with unitarily evolved potentials

    S. N. More🇺🇸 · S. König🇺🇸 · R. J. Furnstahl🇺🇸 · K. Hebeler🇩🇪

    Renormalization group (RG) methods used to soften Hamiltonians for nuclear many-body calculations change the effective resolution of the interaction. For nucleon knock-out processes, these RG transformations leave cross sections invariant, but initial-state wave functions, interaction currents, and final-state interactions are individually altered. This has implications for the factorization of nuclear structure and reactions. We use deuteron electrodisintegration as a controlled laboratory for studying how structure and reaction components are modified under RG evolution, without the complication of three-body forces or currents. The dependence of these changes on kinematics is explored.

    Comments:
    17 pages, 13 figures, published version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.04955 [pdf]
    PRC(2015)·19 citations
  3. 03

    [Submitted on 15 Oct 2015] (cross-list from hep-ph)

    On the rapidity dependence of the average transverse momentum in hadronic collisions

    F. O. Durães🇧🇷 · A. V. Giannini🇧🇷 · V. P. Goncalves🇧🇷 · F. S. Navarra🇧🇷

    The energy and rapidity dependence of the average transverse momentum in and collisions at RHIC and LHC energies are estimated using the Colour Glass Condensate (CGC) formalism. We update previous predictions for the - spectra using the hybrid formalism of the CGC approach and two phenomenological models for the dipole - target scattering amplitude. We demonstrate that these models are able to describe the RHIC and LHC data for the hadron production in , and collisions at GeV. Moreover, we present our predictions for and demonstrate that the ratio decreases with the rapidity and has a behaviour similar to that predicted by hydrodynamical calculations.

    Comments:
    11 pages, 7 figures; revised version: new results for the average transverse momentum at partonic level added in fig. 4; Results and Discussion section has been improved and enlarged
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1510.04737 [pdf]
    PRC(2016)·18 citations
  4. 04

    [Submitted on 16 Oct 2015] (cross-list from hep-ph)

    FRG Approach to Nuclear Matter at Extreme Conditions

    Péter Pósfay🇭🇺 · Gergely Gábor Barnaföldi🇭🇺 · Antal Jakovác🇭🇺

    Functional renormalization group (FRG) is an exact method for taking into account the effect of quantum fluctuations in the effective action of the system. The FRG method applied to effective theories of nuclear matter yields equation of state which incorporates quantum fluctuations of the fields. Using the local potential approximation (LPA) the equation of state for Walecka-type models of nuclear matter under extreme conditions could be determined. These models can be tested by solving the corresponding Tolman--Oppenheimer--Volkov (TOV) equations and investigating the properties (mass and radius) of the corresponding compact star models. Here, we present the first steps on this way, we obtained a Maxwell construction within the FRG-based framework using a Walecka-type Lagrangian.

    Comments:
    6 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1510.04906 [pdf]
    PoS(2015)·3 citations
  5. 05

    [Submitted on 16 Oct 2015] (cross-list from astro-ph.HE)

    Theory Considerations For Nucleosynthesis Beyond Fe With Special Emphasis On p-Nuclei In Massive Stars

    T. Rauscher · N. Nishimura · R. Hirschi

    Nucleosynthesis of heavy elements requires the use of different experimental and theoretical methods to determine astrophysical reaction rates than light element nucleosynthesis. Additionally, there are also larger uncertainties involved in the astrophysical models, both because the sites are not well known and because of differing numerical treatments in different models. As an example for the latter, the production of p-nuclei is compared in two different stellar models, demonstrating that a model widely used for postproduction calculations may have a zone grid too coarse to follow the synthesis of p-nuclei in detail.

    Comments:
    6 pages, 2 figures; Proceedings of the CETUP* 2015 Neutrino sessions; to appear in AIP Conf. Proc. (v2: typos corrected). arXiv admin note: text overlap with arXiv:1508.06569
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1510.04994 [pdf]
    AIP Conf.Proc.(2016)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE