PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·July 4, 2018

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    [Submitted on 3 Jul 2018]

    Dirac Phenomenological Analyses of 1.047 GeV Proton Inelastic Scatterings from Ni and Ni

    Sugie Shim🇰🇷

    Unpolarized 1.047 GeV proton inelastic scatterings from Ni isotopes, Ni and Ni are analyzed phenomenologically employing an optical potential model and the first order collective model in the relativistic Dirac coupled channel formalism. The Dirac equations are reduced to the Schrödinger-like second-order differential equations and the effective central and spin-orbit optical potentials are analyzed by considering mass number dependence. The multistep excitation via state is found to be important for the state excitation in the ground state rotational band at the proton inelastic scatterings from the Ni isotopes. The calculated deformation parameters for the 2, the 4 states of the ground state rotational band and the first 3 state are found to agree pretty well with those obtained in the nonrelativistic calculations.

    Comments:
    14 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1807.00991 [pdf]
    J.Korean Phys.Soc.(2018)·1 citation
  2. 02

    [Submitted on 3 Jul 2018]

    Calculation of a complete set of spin observables for proton elastic scattering from stable and unstable nuclei

    W. A. Yahya · B. I. S. van der Ventel · R. A. Bark · B. C. Kimene Kaya

    A microscopic study of proton elastic scattering from unstable nuclei at intermediate energies using a relativistic formalism is presented. We have employed both the original relativistic impulse approximation (IA1) and the generalised impulse approximation (IA2) formalisms to calculate the relativistic optical potentials, with target densities derived from relativistic mean field (RMF) theory using the NL3 and FSUGold parameter sets. Comparisons between the optical potentials computed using both IA1 and IA2 formalisms, and the different RMF Lagrangians are presented for both stable and unstable targets. The comparisons are required to study the effect of using IA1 versus IA2 optical potentials, with different RMF parameter sets, on elastic scattering observables for unstable targets at intermediate energies. We also study the effect of full-folding versus the factorized form of the optical potentials on elastic scattering observables. As with the case for stable nuclei, we found that the use of the full-folding optical potential improves the scattering observables (especially spin observables) at low intermediate energy (e.g. 200MeV). No discernible difference is found at a projectile incident energy of 500 MeV. To check the validity of using localized optical potential, we calculate the scattering observables using non-local potentials by solving the momentum space Dirac equation. The Dirac equation is transformed to two coupled Lippmann-Schwinger equations, which are then numerically solved to obtain elastic scattering observables. The results are discussed and compared to calculations involving local coordinate-space optical potentials.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1807.01030 [pdf]
    PRC(2018)·5 citations
  3. 03

    [Submitted on 2 Jul 2018]

    Connecting the nuclear EoS to the interplay between fusion and quasifission processes in low-energy nuclear reactions

    H. Zheng🇨🇳 · S. Burrello🇮🇹 · M. Colonna🇮🇹 · D. Lacroix🇫🇷 · G. Scamps🇯🇵

    Within the Time Dependent Hartree Fock (TDHF) approach, we investigate the impact of several ingredients of the nuclear effective interaction, such as incompressibility, symmetry energy, effective mass, derivative of the Lane potential and surface terms on the exit channel (fusion vs quasifission) observed in the reaction U+Ca, close to the Coulomb barrier. Our results show that all the ingredients listed above contribute to the competition between fusion and quasifission processes, however the leading role in determining the outcome of the reaction is played by incompressibility, symmetry energy and the isoscalar coefficient of the surface term. This study unravels the complexity of the fusion and quasifission reaction dynamics and helps to understand the microscopic processes responsible for the final outcome of low energy heavy ion collisions in terms of relevant features of the nuclear effective interaction and associated equation of state (EoS).

    Comments:
    10 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1807.01175 [pdf]
    PRC(2018)·44 citations
  4. 04

    [Submitted on 3 Jul 2018]

    Testing charm quark thermalisation within the Statistical Hadronisation Model

    A. Andronic🇩🇪 · P. Braun-Munzinger🇩🇪 · M. K. Koehler🇩🇪 · J. Stachel🇩🇪

    A wealth of data on charmonium production in Pb-Pb collisions from the LHC experiments has provided strong evidence for (re-)generation as a dominant production mechanism at low transverse momentum. We present an important extension of the statistical hadronisation model to describe transverse momentum distributions based on input parameters from hydrodynamical simulations. Comparison to the data allows the testing of the degree of thermalisation of charm quarks in the quark-gluon plasma. To this end we will report analyses of the transverse momentum spectra in Pb-Pb collisions at and TeV.

    Comments:
    4 pages, 4 figures, proceedings for Quark Matter 2018, Venice, Italy
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1807.01236 [pdf]
    NPA(2019)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE