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Nuclear Theory·nucl-th

Thursday·April 16, 2015

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 01

    Jet propagation within a Linearized Boltzmann Transport Model

    Tan Luo (CCNU)🇨🇳 · Yayun He (CCNU)🇨🇳 · Xin-Nian Wang (CCNU & LBNL)🇨🇳 · Yan Zhu (Santiago de Compostela U.)🇪🇸

    A Linear Boltzmann Transport (LBT) model has been developed for the study of jet propagation inside a quark-gluon plasma. Both leading and thermal recoiled partons are transported according to the Boltzmann equations to account for jet-induced medium excitations. In this talk, we present our study within the LBT model in which we implement the complete set of elastic parton scattering processes. We investigate elastic parton energy loss and their energy and length dependence. We further investigate elastic energy loss and transverse shape of reconstructed jets. Contributions from the recoiled thermal partons are found to have significant influences on the jet energy loss and transverse profile.

    nucl-thhep-phNPA(2014)·3 citations
  2. 02

    Semi-microscopic modeling of heavy-ion fusion reactions with multi-reference covariant density functional theory

    K. Hagino · J.M. Yao

    We describe low-lying collective excitations of atomic nuclei with the multi-reference covariant density functional theory, and combine them with coupled-channels calculations for heavy-ion fusion reactions at energies around the Coulomb barrier. To this end, we use the calculated transition strengths among several collective states as inputs to the coupled-channels calculations. This approach provides a natural way to describe anharmonic multi-phonon excitations as well as a deviation of rotational excitations from a simple rigid rotor. We apply this method to subbarrier fusion reactions of Ni+Ni, Ni+Ni and Ca+Ni systems. We find that the effect of anharmonicity tends to smear the fusion barrier distributions, better reproducing the experimental data compared to the calculations in the harmonic oscillator limit.

    nucl-thnucl-exPRC(2015)·14 citations
  3. 03

    Principal component analysis within nuclear structure

    A. Al-Sayed

    The principal component analysis (PCA) of different parameters affecting collectivity of nuclei predicted to be candidate of the interacting boson model dynamical symmetries are performed. The results show that, the use of PCA within nuclear structure can give us a simple way to identify collectivity together with the parameters simultaneously affecting it.

    nucl-thNPA(2015)·5 citations
  4. 04

    Light exotic nuclei with extreme neutron excess and

    V.N. Tarasov · K.A. Gridnev · V.I. Kuprikov · D.K. Gridnev · D.V. Tarasov · K.S. Godbey · X. ViÑas · Walter Greiner

    Using HF+BCS method we study light nuclei with nuclear charge in the range and lying near the neutron drip line. The HF method uses effective Skyrme forces and allows for axial deformations. We find that the neutron drip line forms stability peninsulas at He and C. These isotopes are found to be stable against one neutron emission and possess the highest known neutron to proton ratio in stable nuclei.

    nucl-thIJMPE(2015)·0 citations
  5. 05

    Light clusters, pasta phases and phase transitions in core-collapse supernova matter

    Helena Pais🇵🇹 · Silvia Chiacchiera🇵🇹 · Constanca Providência🇵🇹

    The pasta phase in core-collapse supernova matter (finite temperatures and fixed proton fractions) is studied within relativistic mean field models. Three different calculations are used for comparison, the Thomas-Fermi (TF), the Coexisting Phases (CP) and the Compressible Liquid Drop (CLD) approximations. The effects of including light clusters in nuclear matter and the densities at which the transitions between pasta configurations and to uniform matter occur are also investigated. The free energy, pressure, entropy and chemical potentials in the range of particle number densities and temperatures expected to cover the pasta region are calculated. Finally, a comparison with a finite temperature Skyrme-Hartree-Fock calculation is drawn.

    nucl-thPRC(2015)·64 citations
  6. 06

    Quark-hadron duality constraints on \gamma Z box corrections to parity-violating elastic scattering

    N. L. Hall🇨🇦 · P. G. Blunden🇨🇦 · W. Melnitchouk🇺🇸 · A. W. Thomas🇦🇺 · R. D. Young🇦🇺

    We examine the interference \gamma Z box corrections to parity-violating elastic electron--proton scattering in the light of the recent observation of quark-hadron duality in parity-violating deep-inelastic scattering from the deuteron, and the approximate isospin independence of duality in the electromagnetic nucleon structure functions down to Q^2 \approx 1 GeV^2. Assuming that a similar behavior also holds for the \gamma Z proton structure functions, we find that duality constrains the \gamma Z box correction to the proton's weak charge to be \Re e\, \square_{\gamma Z}^V = (5.4 \pm 0.4) \times 10^{-3} at the kinematics of the Q_{\text{weak}} experiment. Within the same model we also provide estimates of the \gamma Z corrections for future parity-violating experiments, such as MOLLER at Jefferson Lab and MESA at Mainz.

    nucl-thhep-phnucl-exPLB(2016)·29 citations
  7. 07

    Robustness of the Baryon-Stopping Signal for the Onset of Deconfinement in Relativistic Heavy-Ion Collisions

    Yu. B. Ivanov🇷🇺 · D. Blaschke🇷🇺

    The impact of the experimental acceptance, i.e. transverse-momentum () cut-off and limited rapidity region, on the earlier predicted irregularity in the excitation function of the baryon stopping is studied. This irregularity is a consequence of the onset of deconfinement occurring in the compression stage of a nuclear collision and manifests itself as a wiggle in the excitation function of the reduced curvature () of the net-proton rapidity distribution at midrapidity. It is demonstrated that the wiggle is a very robust signal of a first-order phase transition that survives even under conditions of a very limited acceptance. At the same time the for pure hadronic and crossover transition scenarios become hardly distinguishable, if the acceptance cuts off too much of the low- proton spectrum and/or puts too narrow rapidity window around midrapidity. It is found that the shape of the net-proton rapidity distribution near midrapidity depends on the cut-off. This implies that the measurements should be taken at the same acceptance for all collision energies in order to reliably conclude on the presence or absence of the irregularity.

    nucl-thhep-exhep-phPRC(2015)·31 citations

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first authorsco-authorsvia INSPIRE