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Nuclear Theory·nucl-th

Tuesday·December 20, 2016

19 papers—7 primary·12 cross-listed

All19Primary7Cross-lists12
  1. 01

    Systematic procedure for analyzing cumulants at any order

    Philippe Di Francesco🇫🇷 · Maxime Guilbaud🇺🇸 · Matthew Luzum🇧🇷 · Jean-Yves Ollitrault🇫🇷

    We present a systematic procedure for analyzing cumulants to arbitrary order in the context of heavy-ion collisions. It generalizes and improves existing procedures in many respects. In particular, particles which are correlated are allowed to belong to different phase-space windows, which may overlap. It also allows for the analysis of cumulants at any order, using a simple algorithm rather than complicated expressions to be derived and coded by hand. In the case of azimuthal correlations, it automatically corrects to leading order for detector non-uniformity, and it is useful for numerous other applications as well. We discuss several of these applications: anisotropic flow, event-plane correlations, symmetric cumulants, net baryon and net charge fluctuations.

    nucl-thhep-exhep-phnucl-exPRC(2017)·55 citations
  2. 02

    Heavy meson flow harmonics in event-by-event viscous relativistic hydrodynamics

    Caio A. G. Prado🇧🇷 · Jacquelyn Noronha-Hostler🇺🇸 · Jorge Noronha🇧🇷 · Alexandre A. P. Suaide🇧🇷 · Marcelo G. Munhoz🇧🇷 · Mauro R. Cosentino🇧🇷

    Event-by-event viscous hydrodynamics is combined with heavy quark energy loss models to compute heavy flavor flow cumulants , , and as well as the nuclear modification factors of and mesons in PbPb collisions at 2.76 TeV. Our results indicate that bottom quarks can flow as much as charm quarks in the range 8--30 GeV.

    nucl-thhep-phnucl-exNucl.Part.Phys.Proc.(2017)·3 citations
  3. 03

    Decay mechanism and lifetime of Kr

    L.V. Grigorenko · T.A. Golubkova · J.S. Vaagen · M.V. Zhukov

    The lifetime of the recently discovered emitter Kr was recently found considerably below the lower limit predicted theoretically. This communication addresses this issue.Different separation energy systematics are analyzed and different mechanisms for emission are evaluated. It is found that the most plausible reason for this disagreement is a decay mechanism of Kr, which is not "true " emission, but "transition dynamics" on the borderline between true and sequential decay mechanisms. If this is true, this imposes stringent limits MeV on the ground state energy of Br relative to the Se- threshold.

    nucl-thPRC(2017)·20 citations
  4. 04

    Shell-model calculation of isospin-symmetry breaking correction to superallowed Fermi beta-decay

    L. Xayavong🇫🇷 · N. A. Smirnova🇫🇷 · M. Bender🇫🇷 · K. Bennaceur🇫🇷

    We investigate the radial-overlap part of the isospin-symmetry breaking correction to superallowed -decay using the shell-model approach similar to that of Refs. [1, 2]. The 8 sd-shell emitters with masses between and have been re-examined. The Fermi matrix element is evaluated with realistic spherical single-particle wave functions, obtained from spherical Woods-Saxon (WS) or Hartree-Fock (HF) potentials, fine-tuned to reproduce the experimental data on charge radii and separation energies for nuclei of interest. The elaborated adjustment procedure removes any sensitivity of the correction to a specific parametrisation of the WS potential or to various versions of the Skyrme interaction. The present results are generally in good agreement with those reported in Refs. [3, 4]. At the same time, we find that the calculations with HF wave functions result in systematically lower values of the correction.

    nucl-thActa Phys.Polon.Supp.(2017)·4 citations
  5. 05

    Probing Surface Quantum Flows in Deformed Pygmy Dipole Modes

    Kai Wang · M. Kortelainen · J.C. Pei

    In order to explore the nature of collective modes in weakly bound nuclei, we have investigated deformation effects and surface flow patterns of isovector dipole modes in a shape-coexisting nucleus Mg. The calculations were done in a fully self-consistent continuum finite-amplitude Quasiparticle Random Phase Approximation (QRPA) in a large deformed spatial mesh. An unexpected result of pygmy and giant dipole modes having disproportionate deformation splittings in strength functions was obtained. Furthermore, the transition current densities demonstrate that the long-sought core-halo oscillation in pygmy resonances is collective and compressional, corresponding to the lowest excitation energy and the simplest quantum flow topology. Our calculations show that surface flow patterns become more complicated as excitation energies increase.

    nucl-thPRC(2017)·21 citations
  6. 06

    Kaon-nucleon scattering to one-loop order in heavy baryon chiral perturbation theory

    Bo-Lin Huang🇨🇳 · Yun-De Li🇨🇳

    We calculate the T-matrices of kaon-nucleon () and antikaon-nucleon () scattering to one-loop order in SU(3) heavy baryon chiral perturbation theory (HBPT). The low-energy constants (LECs) and their combinations are then determined by fitting the phase shifts of scattering and the corresponding data. This leads to a good description of the phase shifts below 200 MeV kaon laboratory momentum. We obtain the LEC uncertainties through statistical regression analysis. We also determine the LECs through the use of scattering lengths in order to check the consistency of the HBPT framework for different observables and obtain a consistent result. By using these LECs, we predict the elastic scattering phase shifts and obtain reasonable results. The scattering lengths are also predicted, which turn out to be in good agreement with the empirical values except for the isospin-0 scattering length that is strongly affected by the resonance. As most calculations in the chiral perturbation theory, the convergence issue is discussed in detail. Our calculations provide a possibility to investigate the baryon-baryon interaction in HBPT.

    nucl-thPRD(2015)·13 citations
  7. 07

    Coarse grained short-range correlations

    I. Ruiz Simo · R. Navarro Perez · J.E. Amaro · E. Ruiz Arriola

    We develop a scheme to take into account the effects of short-range nucleon-nucleon correlations in the nucleon-pair wave function by solving the Bethe-Goldstone equation for a coarse grained delta shell potential in S-wave configuration. The S-wave delta shell potential has been adjusted to reproduce the S phase shifts of the AV18 potential for this partial wave up to 2 GeV in the laboratory kinetic energy. We show that a coarse grained potential can describe the high momentum tail of the back-to-back correlated pairs and the -matrix in momentum space. We discuss the easiness and robustness of the calculation in coordinate space and the future improvements and utilities of this model. This work suggests the possibility of using perturbation theory for describing the short-range correlations, and related to this, to substitute the -matrix by an appropriate coarse-grained potential.

    nucl-thPRC(2017)·9 citations

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first authorsco-authorsvia INSPIRE