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Nuclear Theory·nucl-th

Tuesday·September 6, 2016

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 01

    Novel quantum phenomena induced by strong magnetic fields in heavy-ion collisions

    Koichi Hattori🇨🇳 · Xu-Guang Huang🇺🇸

    The relativistic heavy-ion collisions create both hot quark-gluon matter and strong magnetic fields, and provide an arena to study the interplay between quantum chromodynamics and quantum electrodynamics. In recent years, it has been shown that such an interplay can generate a number of interesting quantum phenomena in hadronic and quark-gluon matter. In this short review, we first discuss some properties of the magnetic fields in heavy-ion collisions and then give an overview of the magnetic field-induced novel quantum effects. In particular, we focus on the magnetic effect on the heavy flavor mesons, the heavy-quark transports, and the phenomena closely related to chiral anomaly.

    nucl-thhep-phnucl-exNucl.Sci.Tech.(2017)·179 citations
  2. 02

    Nuclear mean field and double-folding model of the nucleus-nucleus optical potential

    Dao T. Khoa · Nguyen Hoang Phuc · Doan Thi Loan · Bui Minh Loc

    Realistic density dependent CDM3Yn versions of the M3Y interaction have been used in an extended Hartree-Fock (HF) calculation of nuclear matter (NM), with the nucleon single-particle potential determined from the total NM energy based on the Hugenholtz-van Hove theorem that gives rise naturally to a rearrangement term (RT). Using the RT of the single-nucleon potential obtained exactly at different NM densities, the density- and energy dependence of the CDM3Yn interactions was modified to account properly for both the RT and observed energy dependence of the nucleon optical potential. Based on a local density approximation, the double-folding model of the nucleus-nucleus optical potential has been extended to take into account consistently the rearrangement effect and energy dependence of the nuclear mean-field potential, using the modified CDM3Yn interactions. The extended double-folding model was applied to study the elastic C+C and O+C scattering at the refractive energies, where the Airy structure of the nuclear rainbow has been well established. The RT was found to affect significantly the real nucleus-nucleus optical potential at small internuclear distances, giving the potential strength close to that implied by the realistic optical model description of the Airy oscillation.

    nucl-thPRC(2016)·49 citations
  3. 03

    Shell plus pairing effect arguments for cluster preformation at the nuclear surface in cold fission

    D. N. Poenaru · R. A. Gherghescu

    In 1928 G. Gamow as well as Condon and Gurney gave the first explanation of alpha decay as a quantum tunnelling of a preformed particle at the nuclear surface. Soon after experimental discovery in 1984 by Rose and Jones of cluster radioactivity, confirming earlier (1980) predictions by Sandulescu, Poenaru and W. Greiner, a microscopic theory also explained the phenomenon in a similar way. Here we show for the first time that in a spontaneous cold fission process the shell plus pairing corrections calculated with Strutinsky's procedure may give a strong argument for preformation of a light fission fragment near the nuclear surface. It is obtained when the radius of the light fragment, , is increased linearly with the separation distance, , of the two fragments, while for ~constant one gets the well known two hump potential barrier.

    nucl-th2 citations
  4. 04

    Theoretical study of the Xi(1620) and Xi(1690) resonances in Xi_c -> pi^+ MB decays

    Kenta Miyahara🇯🇵 · Tetsuo Hyodo🇯🇵 · Makoto Oka🇯🇵 · Juan Nieves🇪🇸 · Eulogio Oset🇪🇸

    Nonleptonic weak decays of Xi_c into pi^+ and a meson (M)-baryon (B) final state, MB, are analyzed from the viewpoint of probing S=-2 baryon resonances, i.e. Xi(1620) and Xi(1690), of which spin-parity and other properties are not well known. We argue that the weak decay of Xi_c is dominated by a single quark-line diagram, preferred by the Cabibbo-Kobayashi-Maskawa coefficient, color recombination factor, the diquark correlation, and the kinematical condition. The decay process has an advantage of being free from meson resonances in the pi^+M invariant mass distribution. The invariant mass distribution of the meson-baryon final state is calculated with three different chiral unitary approaches, assuming that the Xi(1620) and Xi(1690) resonances have J^P=1/2^-. It is found that a clear peak for the Xi(1690) is seen in the piXi and KbarLambda spectra. We also suggest that the ratios of the piXi, KbarLambda and KbarSigma final states are useful to distinguish whether the peak is originated from the Xi(1690) resonance or it is a KbarSigma threshold effect.

    nucl-thhep-phPRC(2017)·67 citations
  5. 05

    Forced canonical thermalization in a hadronic transport approach at high density

    Dmytro Oliinychenko🇺🇦 · Hannah Petersen🇩🇪

    Hadronic transport approaches based on an effective solution of the relativistic Boltzmann equation are widely applied for the dynamical description of heavy ion reactions at low beam energies. At high densities, the assumption of binary interactions often used in hadronic transport approaches may not be applicable anymore. Therefore, we effectively simulate the high-density regime using the local forced canonical thermalization. This framework provides the opportunity to interpolate in a dynamical way between two different limits of kinetic theory: the dilute gas approximation and the ideal fluid case. This approach will be important for studies of the dynamical evolution of heavy ion collisions at low and intermediate energies as experimentally investigated at the beam energy scan program at RHIC, and in the future at FAIR and NICA. On the other hand, this new way of modelling hot and dense strongly-interacting matter might be relevant for small systems at high energies (LHC and RHIC) as well.

    nucl-thhep-phnucl-exJ.Phys.G(2017)·17 citations

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first authorsco-authorsvia INSPIRE