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Nuclear Theory·nucl-th

Friday·January 23, 2015

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Forward Compton Scattering with weak neutral current: constraints from sum rules

    Mikhail Gorchtein🇩🇪 · Xilin Zhang🇺🇸

    We generalize forward real Compton amplitude to the case of the interference of the electromagnetic and weak neutral current, formulate a low-energy theorem, relate the new amplitudes to the interference structure functions and obtain a new set of sum rules. We address a possible new sum rule that relates the product of the axial charge and magnetic moment of the nucleon to the 0th moment of the structure function . We apply the GDH and the finite energy sum rule for constraining the dispersive -box correction to the proton's weak charge.

    nucl-thhep-phnucl-exPLB(2015)·8 citations
  2. 02

    Hyperons in neutron stars

    Tetsuya Katayama🇯🇵 · Koichi Saito🇯🇵

    Using the Dirac-Brueckner-Hartree-Fock approach, the properties of neutron-star matter including hyperons are investigated. In the calculation, we consider both time and space components of the vector self-energies of baryons as well as the scalar ones. Furthermore, the effect of negative-energy states of baryons is partly taken into account. We obtain the maximum neutron-star mass of , which is consistent with the recently observed, massive neutron stars. We discuss a universal, repulsive three-body force for hyperons in matter.

    nucl-thastro-ph.SRhep-phPLB(2015)·69 citations
  3. 03

    Elimination of influence of neutron-skin size difference of initial colliding nuclei in Pb+Pb collisions

    Gao-Feng Wei🇨🇳

    Within an isospin- and momentum-dependent transport model using as an input nucleon density profiles from Hartree-Fock calculations based on a modified Skyrme-like (MSL) model, we study how to eliminate the influence of neutron-skin size difference of initial colliding nuclei in probing the nuclear symmetry energy. Within the current experimental uncertainty range of neutron-skin size of Pb, the Pb+Pb collisions are performed in semicentral and peripheral collisions with impact parameters of 5 and 9fm and at beam energies from 50 MeV/nucleon to 1000 MeV/nucleon, respectively. It is shown that combination of neutron and proton collective flows, i.e., neutron-proton differential elliptic flow, neutron-proton elliptic flow difference, neutron-proton differential transverse flow and neutron-proton transverse flow difference, can effectively eliminate the effects of neutron-skin size difference and thus can be as useful sensitive observables in probing nuclear matter symmetry energy in heavy-ion collisions. Moreover, the combined neutron-proton stopping power including the neutron-proton differential stopping power and neutron-proton stopping power difference can also eliminate the effects of neutron-skin size difference and shows some sensitivities to symmetry energy especially at the lower beam energy.

    nucl-thnucl-exPRC(2015)·6 citations
  4. 04

    Collective enhancement of nuclear state densities by the shell model Monte Carlo approach

    C. Özen · Y. Alhassid · H. Nakada

    The shell model Monte Carlo (SMMC) approach allows for the microscopic calculation of statistical and collective properties of heavy nuclei using the framework of the configuration-interaction shell model in very large model spaces. We present recent applications of the SMMC method to the calculation of state densities and their collective enhancement factors in rare-earth nuclei.

    nucl-thJ.Phys.Conf.Ser.(2015)·0 citations
  5. 05

    Proton Structure and PHENIX Experiment

    Jian-Wei Qiu🇺🇸

    We briefly summarize the important and critical roles that PHENIX Experiment has played in determining the proton's internal structure in terms of quarks and gluons, and their dynamics. Some pioneering measurements by PHENIX Experiment on the motion and polarization of quarks and gluons, as well as their correlations inside a fast moving proton are presented. Some future opportunities and potentials of PHENIX Experiment are also discussed.

    nucl-thhep-phnucl-exPTEP(2015)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE