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Nuclear Theory·nucl-th

Thursday·May 12, 2022

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    Constraining equation of state of nuclear matter by charge-changing cross section measurements of mirror nuclei

    Jun-Yao Xu · Zheng-Zheng Li · Bao-Hua Sun · Yi-Fei Niu · Xavier Roca-Maza · Hiroyuki Sagawa · Isao Tanihata

    The nuclear symmetry energy plays a key role in determining the equation of state (EoS) of dense, neutron-rich matter, which connects the atomic nuclei with the hot and dense matter in universe, thus has been the subject of intense investigations in laboratory experiments, astronomy observations and theories. Various probes have been proposed to constrain the symmetry energy and its density dependence. Currently, the extensive data yield already a good and consistent constraint to the symmetry energy () at saturation density, but do not yet give a consistent result of one critical EoS parameter, , the density dependence of the symmetry energy. In this work, we report a new probe of at saturation density. A good linear correlation is found between and the charge changing cross section difference () of mirror nuclei Si-S for both the Skyrme-Hartree-Fock theory (SHF) and covariant (relativistic) density functionals (CDF). We found that the pairing effect for this mirror pair is essential to get a consistent correlation between and in both the SHF and CDF. Here, the cross sections are calculated on the same target and at the same energy using the zero-range optical-limit Glauber model. The linearity is found to be in the same precision as those found between and neutron skin thickness or proton radius difference.

    nucl-thPLB(2022)·23 citations
  2. 02

    Bulk pressure in fluid-dynamical simulations of Pb-Pb and p-Pb collisions at the LHC energies

    Josef Bobek🇨🇿 · Iurii Karpenko (FNSPE CTU in Prague)🇨🇿

    State-of-the-art fluid dynamical simulations of relativistic heavy-ion collisions employ initial state models which result in a rather strong radial flow. In order to fit the experimental observables, a non-negligible bulk viscosity of the QGP and/or hadronic matter is required. We examine modern parametrizations of the bulk viscosity to entropy density ratio used in recent fluid dynamical simulations, and explore the relative magnitude of the associated bulk viscous corrections in space-time, for Pb-Pb and p-Pb collisions at TeV LHC energy with a state-of-the-art initial state provided by TRENTo model. It turns out that, at a typical particlization hypersurface, the effect of bulk viscosity out-competes the one of shear viscosity, and in a significantly large part of the space-time volume, the bulk pressure strongly counteracts the equilibrium pressure, thus the effective pressure approaches zero. The latter potentially challenges the applicability of fluid-dynamical modelling of heavy ion-ion and proton-ion collisions at the LHC energies.

    nucl-thhep-exhep-ph2 citations
  3. 03

    Nature of particles azimuthal anisotropy at low and high transverse momenta in ultrarelativistic A+A collisions

    L V Bravina🇳🇴 · G Kh Eyyubova🇷🇺 · V L Korotkikh🇷🇺 · I P Lokhtin🇷🇺 · S V Petrushanko🇷🇺 · A M Snigirev🇷🇺 · E E Zabrodin🇳🇴

    LHC data on the correlations of the elliptic flow of particles at low and high transverse momenta from Pb+Pb collisions at center-of-mass energy per nucleon pair TeV are analyzed in the framework of the HYDJET++ model. This model includes soft and hard components which allows to describe the region of both low and high transverse momenta. The origin of values in different regions is investigated at different centralities. It is shown that the experimentally observed correlations between at low and high in peripheral lead-lead collisions is due to correlation of particles in jets.

    nucl-thhep-phPhys.Scripta(2022)·1 citation
  4. 04

    Quantum Computing Calculations for Nuclear Structure and Nuclear Data

    Isaac Hobday🇬🇧 · Paul D Stevenson🇬🇧 · James Benstead🇬🇧

    Model calculations of nuclear properties are peformed using quantum computing algorithms on simulated and real quantum computers. The models are a realistic calculation of deuteron binding based on effective field theory, and a simplified two-level version of the nuclear shell model known as the Lipkin-Meshkov-Glick model. A method of reducing the number of qubits needed for practical calculation is presented, the reduction being with respect to the number needed when the standard Jordan-Wigner encoding is used. Its efficacy is shown in the case of the deuteron binding and shell model. A version of the variational quantum eigensolver in which all eigenstates in a spectrum are targetted on an equal basis is shown. The method involves finding the minima of the variance of the Hamiltonian. The method's ability to find the full spectrum of the simplified shell model is presented.

    nucl-thProc.SPIE Int.Soc.Opt.Eng.(2022)·8 citations

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first authorsco-authorsvia INSPIRE