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Nuclear Theory·nucl-th

Wednesday·February 7, 2018

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 01

    The octupole collective Hamiltonian. Does it follow the example of the quadrupole case?

    S.G.Rohozinski · L. Prochniak

    A general form of the octupole collective Hamiltonian is introduced and analyzed based on fundamental tensors in the seven-dimensional tensor space. Possible definitions of intrinsic frames of reference possessing cubic symmetry for the octupole tensor are considered. Cubic intrinsic octupole coordinates or deformations are introduced. Shapes of the octupoloid are investigated. The octupole collective Hamiltonian is expressed in intrinsic coordinates. An intrinsic angular momentum carried by the octupole vibrations is discovered. Small oscillations about an axially-symmetric pear shape are analyzed. Formulation of a unified quadrupole-octupole collective model is discussed.

    nucl-th1 citation
  2. 02

    Impact of medium modification of the nucleon weak and electromagnetic form factors on the neutrino mean free path in dense matter

    Parada T. P. Hutauruk🇰🇷 · Yongseok Oh🇰🇷 · K. Tsushima🇰🇷

    Impact of the in-medium modified nucleon weak and electromagnetic form factors on the neutrino mean free path in dense matter is studied by considering both the weak and electromagnetic interactions of neutrinos with the constituents of the matter. A relativistic mean field model and the quark-meson coupling model are respectively adopted for the in-medium effective nucleon mass and nucleon form factors. We find that the cross sections of neutrino scattering in cold nuclear medium decreases when the in-medium modification of the nucleon weak and electromagnetic form factors are taken into account. This reduction results in the enhancement of the neutrino mean free path, in particular at the baryon density of around a few times of the normal nuclear matter density. The enhancement of the neutrino mean free path is estimated to be about 10--40\% compared with the values obtained without the medium modification of the nucleon form factors, and the enhancement is expected to accelerate the cooling of neutron stars.

    nucl-thastro-ph.HEhep-exhep-ph+1PRD(2018)·15 citations
  3. 03

    Symplectic no-core configuration interaction framework for ab initio nuclear structure

    Anna E. McCoy · Mark A. Caprio · Tomas Dytrych

    We introduce a symplectic no-core configuration interaction (SpNCCI) framework for ab initio nuclear structure calculations, in a correlated many-body basis which encodes an approximate Sp(3,R) symmetry of the nucleus. Such a scheme potentially provides a means of restricting the many-body space to include only those highly-excited configurations which dominantly contribute to the nuclear wave function. We examine the symplectic symmetry structure arising in an illustrative ab initio SpNCCI calculation for 6Li. We observe both the dominance of symplectic symmetry in individual wave functions and the emergence of families of states related by symplectic symmetry.

    nucl-thScience(2018)·9 citations
  4. 04

    Directed, elliptic and triangular flow of protons in Au+Au reactions at 1.23 AGeV: A theoretical analysis of the recent HADES data

    Paula Hillmann🇩🇪 · Jan Steinheimer🇩🇪 · Marcus Bleicher🇩🇪

    Recently, the HADES experiment at GSI has provided preliminary data on the directed flow, elliptic flow, and triangular flow, of protons in Au+Au reactions at a beam energy of 1.23 A GeV. Here we present a theoretical discussion of these flow harmonics within the UrQMD transport approach. We show that all flow harmonics, including the triangular flow, provide a consistent picture of the expansion of the system, if potential interactions are taken into account. Investigating the dependence of the flow harmonics on the nuclear interaction potentials it is shown that especially can serve as a sensitive probe for the nuclear equation of state at such low energies. The triangular flow and its excitation function with respect to the reaction-plane were calculated for the first time and indicate a complex interplay of the time-evolution of the system and the initial conditions at low beam-energies. Our study also indicates a significant softening of the equation of state at beam energies above A GeV which can be explored by at the future FAIR facility.

    nucl-thJ.Phys.G(2018)·57 citations
  5. 05

    Nonlinear waves in magnetized quark matter and the reduced Ostrovsky equation

    D. A. Fogaça🇧🇷 · S. M. Sanches Jr.🇧🇷 · F. S. Navarra🇧🇷

    We study nonlinear waves in a nonrelativistic ideal and cold quark gluon plasma immersed in a strong uniform magnetic field. In the context of nonrelativistic hydrodynamics with an external magnetic field we derive a nonlinear wave equation for baryon density perturbations, which can be written as a reduced Ostrovsky equation. We find analytical solutions and identify the effects of the magnetic field.

    nucl-thhep-phCommun.Nonlinear Sci.Numer.Simul.(2019)·4 citations

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