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Nuclear Theory·nucl-th

Friday·December 22, 2017

13 papers—5 primary·8 cross-listed

All13Primary5Cross-lists8
  1. 01

    Spin-dependent distribution functions for relativistic hydrodynamics of spin-1/2 particles

    Wojciech Florkowski🇵🇱 · Bengt Friman🇩🇪 · Amaresh Jaiswal🇮🇳 · Radoslaw Ryblewski🇵🇱 · Enrico Speranza🇩🇪

    Recently advocated expressions for the phase-space dependent spin-1/2 density matrices of particles and antiparticles are analyzed in detail and reduced to the forms linear in the Dirac spin operator. This allows for a natural determination of the spin polarization vectors of particles and antiparticles by the trace of products of the spin density matrices and the Pauli matrices. We demonstrate that the total spin polarization vector obtained in this way agrees with the Pauli-Lubanski four-vector, constructed from an appropriately chosen spin tensor and boosted to the particle rest frame. We further show that several forms of the spin tensor used in the literature give the same Pauli-Lubanski four-vector.

    nucl-thPRD(2018)·146 citations
  2. 02

    Modification of in the neutrino nucleus reaction

    Swapan Das🇮🇳

    The remarkable observations in the pion induced and charge exchange reactions on a nucleus are the significant shift and broadening of the -peak relative to free pion nucleon scattering. For the forward going massless leptons, the weak process on a nucleon, according to Adler's partially conserved axial current theorem, is connected to the pion nucleon scattering. This mechanism is also applicable to the nucleus. Therefore, the modification of the -peak in a nucleus can be seen in the reaction since it is connected to the pion nucleus scattering. To investigate this issue quantitatively, the double differential cross sections of the forward going ejectile energy distribution in the reaction are calculated in the -excitation region for both proton and nucleus. The measured pion nucleon and pion nucleus scattering cross sections in the quoted energy region are used in these reactions as input. Since the reaction is connected to the pion induced scattering, the features of the previous reaction is shown analogous to those of the later.

    nucl-thnucl-exActa Phys.Polon.B(2017)·0 citations
  3. 03

    Shadowing in the low energy photonuclear reaction

    Swapan Das🇮🇳

    The photonuclear reaction in the multi-GeV region occurs because of the electromagnetic and hadronic interaction. The later originates due to the hadronic fluctuation, i.e., vector meson, of the photon. The total cross section of the reaction is shadowed because of the vector meson nucleus (hadronic) interaction. To estimate it quantitatively, the cross section of the photonuclear reaction was calculated in the low energy region ( GeV) using simple vector meson dominance (SVMD) model, i.e., the low lying vector mesons (, and mesons) were considered. The nuclear shadowing is reinvestigated using generalized vector meson (GVMD) model, where the higher meson effective state ( meson) is taken into account along with the low lying vector mesons. Using GVMD model, the shadowing and the total cross section of the photonuclear reaction are calculated in the above mentioned energy region. The calculated results have been compared with the measured spectra.

    nucl-thnucl-exPRC(2017)·3 citations
  4. 04

    Eta-mesic nuclei

    A. Cieply🇨🇿 · J. Mares🇨🇿 · M. Schaefer🇨🇿 · N. Barnea🇮🇱 · B. Bazak🇮🇱 · E. Friedman🇮🇱 · A. Gal🇮🇱

    In this contribution we report on theoretical studies of nuclear quasi-bound states in few- and many-body systems performed recently by the Jerusalem-Prague Collaboration [1-5]. Underlying energy-dependent interactions are derived from coupled-channel models that incorporate the resonance. The role of self-consistent treatment of the strong energy dependence of subthreshold amplitudes is discussed. Quite large downward energy shift together with rapid decrease of the amplitudes below threshold result in relatively small binding energies and widths of the calculated nuclear bound states. We argue that the subthreshold behavior of scattering amplitudes is crucial to conclude whether nuclear states exist, in which nuclei the meson could be bound and if the corresponding widths are small enough to allow detection of these nuclear states in experiment.

    nucl-thPoS(2018)·1 citation
  5. 05

    D mesons in strongly magnetized asymmetric nuclear matter

    P. Sushruth Reddy🇮🇳 · C. S. Amal Jahan🇮🇳 · Nikhil Dhale🇮🇳 · Amruta Mishra🇮🇳 · Juergen Schaffner-Bielich

    The medium modifications of the open charm mesons ( and ) are studied in isospin asymmetric nuclear matter in the presence of strong magnetic fields, using a chiral effective model. The mass modifications of these mesons in the effective hadronic model, arise due to their interactions with the protons, neutrons and the scalar mesons (non-strange isoscalar , strange isoscalar, and non-strange isovector, ), in the magnetized nuclear matter. In the presence of magnetic field, for the charged baryon, i.e., the proton, the number density as well as the scalar density have contributions due to the summation over the Landau energy levels. For a given value of the baryon density, , and isospin asymmetry, the scalar fields are solved self consistently from their coupled equations of motion. The modifications of the masses of the and mesons are calculated, from the medium modifications of the scalar fields and the nucleons. The effects of the anomalous magnetic moments of the nucleons on the masses of the open charm mesons are also investigated in the present work. The effects of isospin asymmetry as well as of the anomalous magnetic moments are observed to be prominent at high densities for large values of magnetic fields.

    nucl-thhep-phPRC(2018)·54 citations

Affiliations

first authorsco-authorsvia INSPIRE