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Nuclear Theory·nucl-th

Wednesday·March 18, 2015

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    Quark matter in high-mass neutron stars?

    R. Lastowiecki🇵🇱 · D. Blaschke🇵🇱 · T. Fischer🇵🇱 · T. Klahn🇵🇱

    The recent measurements of the masses of the pulsars PSR J1614-2230 and PSR J0348-0432 provide independent proof for the existence of neutron stars with masses in range of 2 . This fact has significant implications for the physics of high density matter and it challenges the hypothesis that the cores of NS can be composed of deconfined quark matter. In this contribution we study a description of quark matter based on the Nambu--Jona-Lasinio effective model and construct the equation of state for matter in beta equilibrium. This equation of state together with the hadronic Dirac-Brueckner-Hartree-Fock equation of state is used here to describe neutron star and hybrid star configurations. We show that compact stars masses of 2 are compatible with the possible existence of deconfined quark matter in their core.

    nucl-thastro-ph.HEhep-phPhys.Part.Nucl.(2015)·15 citations
  2. 02

    A hybrid model for studying nuclear multifragmentation around Fermi energy domain: Case for central collision of Xe on Sn

    S. Mallik · G. Chaudhuri · S. Das Gupta

    Experimental data for central collisions of Xe on Sn at beam energies of (a) 32 MeV/nucleon, (b) 39 MeV/nucleon, (c) 45 MeV/nucleon and (d) 50 MeV/nucleon are compared with results calculated using a hybrid model. We use a transport model (BUU) to obtain the excitation energy per nucleon in the center of mass of the multifragmenting system. The canonical thermodynamic model is then used to determine the temperature which would lead to this excitation energy. With this temperature we use the canonical thermodynamic model to calculate various experimental data such as multiplicities of different composites, probability distribution of the largest cluster etc. Agreement with data establishes the validity of the model.

    nucl-thnucl-exPRC(2015)·21 citations
  3. 03

    On Excited States of Deuteron Nucleus

    B. F. Kostenko🇷🇺 · J. Pribiš🇸🇰

    For a long time it was known that deuteron, as a weakly coupled nucleon pair, has no excited states. However, A.M. Baldin et al, commenting results of the first physical experiment with accelerated nuclei at JINR synchrophasotron, assumed as far back as in 1979 that one of peaks in a differential cross-section may arise due to an "excited state of deuterium". We have established that one of the peaks in the cross-section may be explained indeed in this way and corresponds to the dibaryon reported by WASA-at-COSY Collaboration. Another peak in the same region is interpreted most likely by interference of several -resonances, and this possibility was also mentioned in the paper by A.M. Baldin et al. Further experimental studies based on modern experimental facilities and more abundant statistics are necessary to verify these observations.

    nucl-th1 citation

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first authorsco-authorsvia INSPIRE