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Nuclear Theory·nucl-th

Friday·October 7, 2016

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    Isospin decomposition of the transitions as input for constructing models of neutrino-induced reactions in the nucleon resonance region

    H. Kamano🇯🇵 · S. X. Nakamura🇯🇵 · T.-S. H. Lee🇺🇸 · T. Sato🇯🇵

    We present our recent efforts to determine the matrix elements associated with the transition between the nucleon and a nucleon resonance induced by the vector current, which are necessary ingredients for models of neutrino-induced reactions in the resonance region. This is accomplished by making the comprehensive analysis of the data for various meson photo- and electro-production reactions off the nucleon within a sophisticated coupled-channels framework, which is known as the ANL-Osaka dynamical coupled-channels model. We also give a brief introduction to our project for constructing a unified neutrino reaction model conducted at the J-PARC Branch of the KEK Theory Center.

    nucl-thhep-exhep-phnucl-ex1 citation
  3. 03

    Correlations between critical parameters and bulk properties of nuclear matter

    O. Lourenço · B. M. Santos · M. Dutra · A. Delfino

    The present work starts by providing a clear identification of correlations between critical parameters (, , ) and bulk quantities at zero temperature of relativistic mean-field models (RMF) presenting third and fourth order self-interactions in the scalar field . Motivated by the nonrelativistic version of this RMF model, we show that effective nucleon mass () and incompressibility (), at the saturation density, are correlated with , , and , as well as, binding energy and saturation density itself. We verify agreement of results with previous theoretical ones regarding different hadronic models. Concerning recent experimental data of the symmetric nuclear matter critical parameters, our study allows a prediction of , and compatible with such values, by combining them, through the correlations found, with previous constraints related to and . An improved RMF parametrization, that better agrees with experimental values for , is also indicated.

    nucl-thastro-ph.SRPRC(2016)·20 citations
  4. 04

    Higher-Harmonic Collective Modes in a Trapped Gas from Second-Order Hydrodynamics

    William E. Lewis · Paul Romatschke

    Utilizing a second-order hydrodynamics formalism, the dispersion relations for the frequencies and damping rates of collective oscillations as well as spatial structure of these modes up to the decapole oscillation in both two- and three- dimensional gas geometries are calculated. In addition to higher-order modes, the formalism also gives rise to purely damped "non-hydrodynamic" modes. We calculate the amplitude of the various modes for both symmetric and asymmetric trap quenches, finding excellent agreement with an exact quantum mechanical calculation. We find that higher-order hydrodynamic modes are more sensitive to the value of shear viscosity, which may be of interest for the precision extraction of transport coefficients in Fermi gas systems.

    ↳ cond-mat.quant-gasnucl-thNew J.Phys.(2017)·3 citations
  5. 05

    Oscillations in counting statistics

    Grzegorz Wilk🇵🇱 · Zbigniew Wlodarczyk🇵🇱

    The very large transverse momenta and large multiplicities available in present LHC experiments on pp collisions allow a much closer look at the corresponding distributions. Some time ago we discussed a possible physical meaning of apparent log-periodic oscillations showing up in p_T distributions (suggesting that the exponent of the observed power-like behavior is complex). In this talk we concentrate on another example of oscillations, this time connected with multiplicity distributions P(N). We argue that some combinations of the experimentally measured values of P(N) (satisfying the recurrence relations used in the description of cascade-stochastic processes in quantum optics) exhibit distinct oscillatory behavior, not observed in the usual Negative Binomial Distributions used to fit data. These oscillations provide yet another example of oscillations seen in counting statistics in many different, apparently very disparate branches of physics further demonstrating the universality of this phenomenon.

    ↳ hep-phnucl-thEPJ Web Conf.(2017)·3 citations
  6. 06

    Holography, Hydrodynamization and Heavy-Ion Collisions

    Michal P. Heller🇨🇦

    In the course of the past several years holography has emerged as an ab initio tool in exploring strongly-time-dependent phenomena in gauge theories. These lecture notes overview recent developments in this area driven by phenomenological questions concerning applicability of hydrodynamics (hydrodynamization) under extreme conditions occurring in ultrarelativistic heavy-ion collisions at RHIC and LHC. The topics include hydrodynamization time scale, holographic collisions, as well as hydrodynamization from the point of view of the asymptotic character of the hydrodynamic gradient expansion. The emphasis is put on concepts rather than calculational techniques and a particular attention is devoted to present these developments in the context of the most recent advances and some of the open problems.

    ↳ hep-thhep-phnucl-thActa Phys.Polon.B(2016)·49 citations

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