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Nuclear Theory·nucl-th

Friday·January 26, 2018

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    New Results for Neutron Radiative Capture on 10be at Energies from 25.3 meV to 10.0 meV

    S. B. Dubovichenko · N. A. Burkova · N. V. Afanasyeva · A. V. Dzhazairov-Kakhramanov · A. S. Tkachenko

    It is shown that in the framework of the modified potential cluster model we succeeded in correct describing the available experimental data for neutron radiative capture on 10Be total cross-sections at low, astrophysical and thermal energies. All interaction potentials for different partial waves are constructed by describing the basic characteristics of the bound states and spectra of final nucleus. Experimental data for the total cross-sections of the neutron radiative capture on 10Be were obtained by using known data for reduced probabilities of 11Be Coulomb dissociation.

    nucl-thAstropart.Phys.(2019)·7 citations
  2. 02

    The dependence of the helion optical model potential and the undularity of the -independent equivalent

    R. S. Mackintosh

    The relationship between -dependence and undularity of the optical model potential (OMP) is studied for the case of the elastic scattering of 33 MeV \nuc{3}{He} on Ni. The relationship that emerges follows the general features of the same relationship found for the proton OMP presented in arXiv:1705.07003. The general background is also presented in that reference.

    nucl-th1 citation
  3. 03

    From Heavy-Ion Collisions to Compact Stars: Equation of State and Relevance of the System Size

    Sylvain Mogliacci🇿🇦 · Isobel Kolbé🇿🇦 · W. A. Horowitz🇿🇦

    In this article, we start by presenting state-of-the-art methods allowing us to compute moments related to the globally conserved baryon number, by means of first principle resummed perturbative frameworks. We focus on such quantities for they convey important properties of the finite temperature and density equation of state, being particularly sensitive to changes in the degrees of freedom across the quark-hadron phase transition. We thus present various number susceptibilities along with the corresponding results as obtained by lattice quantum chromodynamics collaborations, and comment on their comparison. Next, omitting the importance of coupling corrections and considering a zero-density toy model for the sake of argument, we focus on corrections due to the small size of heavy-ion collision systems, by means of spatial compactifications. Briefly motivating the relevance of finite size effects in heavy-ion physics, in opposition to the compact star physics, we present a few preliminary thermodynamic results together with the speed of sound for certain finite size relativistic quantum systems at very high temperature.

    ↳ hep-phcond-mat.stat-mechhep-latnucl-thUniverse(2018)·3 citations
  4. 04

    Non-equilibrium Chiral Magnetic/Vortical Effects in Viscous Fluids

    Yoshimasa Hidaka🇯🇵 · Di-Lun Yang🇯🇵

    We utilize the chiral kinetic theory in a relaxation-time approximation to investigate the nonlinear anomalous responses of chiral fluids with viscous effects. Unlike the cases in equilibrium, it is found that the chiral magnetic effect and chiral vortical effect are modified by the shear and bulk strengths. Particularly, the shear strength could result in charged Hall currents for chiral magnetic and chiral vortical effects, which propagate perpendicular to applied magnetic fields and vorticity. These quantum corrections stemming from side jumps and anomalies are dissipative and pertinent to interactions. Although the non-equilibrium effects upon charge currents are dissipative, the second law of thermodynamics is still satisfied.

    ↳ hep-thcond-mat.mes-hallnucl-thPRD(2018)·64 citations
  5. 05

    Fierz-complete NJL model study II: towards the fixed-point and phase structure of hot and dense two-flavor QCD

    Jens Braun🇩🇪 · Marc Leonhardt🇩🇪 · Martin Pospiech🇩🇪

    Nambu-Jona-Lasinio-type models are often employed as low-energy models for the theory of the strong interaction to analyze its phase structure at finite temperature and quark chemical potential. In particular at low temperature and large chemical potential, where the application of fully first-principles approaches is currently difficult at best, this class of models still plays a prominent role to guide our understanding of the dynamics of dense strong-interaction matter. In this work, we consider a Fierz-complete version of the Nambu-Jona-Lasinio model with two massless quark flavors and study its renormalization group flow and fixed-point structure at leading order of the derivative expansion of the effective action. Sum rules for the various four-quark couplings then allow us to monitor the strength of the breaking of the axial symmetry close to and above the phase boundary. We find that the dynamics in the ten-dimensional Fierz-complete space of four-quark couplings can only be reduced to a one-dimensional space associated with the scalar-pseudoscalar coupling in the strict large- limit. Still, the interacting fixed point associated with this one-dimensional subspace appears to govern the dynamics at small quark chemical potential even beyond the large- limit. At large chemical potential, corrections beyond the large- limit become important and the dynamics is dominated by diquarks, favoring the formation of a chirally symmetric diquark condensate. In this regime, our study suggests that the phase boundary is shifted to higher temperatures when a Fierz-complete set of four-quark interactions is considered.

    ↳ hep-phnucl-thPRD(2018)·52 citations
  6. 06

    BIGSTICK: A flexible configuration-interaction shell-model code (updated)

    Calvin W. Johnson · W. Erich Ormand · Kenneth S. McElvain · Ryan Zbikowski · Hongzhang Shan

    We present BIGSTICK, a flexible configuration-interaction open-source shell-model code for the many-fermion problem. Written mostly in Fortran 90 with some later extensions, BIGSTICK utilizes a factorized on-the-fly algorithm for computing many-body matrix elements, and has both MPI (distributed memory) and OpenMP (shared memory) parallelization, and can run on platforms ranging from laptops to the largest parallel supercomputers. It uses a flexible yet efficient many-body truncation scheme, and reads input files in multiple formats, allowing one to tackle both phenomenological (major valence shell space) and ab initio (the so-called no-core shell model) calculations. BIGSTICK can generate energy spectra, static and transition one-body densities, and expectation values of scalar operators. Using the built-in Lanczos algorithm one can compute transition probability distributions and decompose wave functions into components defined by group theory. This manual provides a general guide to compiling and running BIGSTICK, which comes with numerous sample input files, as well as some of the basic theory underlying the code. Updated November 2025 to version 8.0.0

    ↳ physics.comp-phnucl-th123 citations

Affiliations

first authorsco-authorsvia INSPIRE