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Nuclear Theory·nucl-th

Thursday·September 22, 2016

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 21 Sept 2016]

    Coupled-channels description of the 40Ca+58,64Ni transfer and fusion reactions

    G. Scamps🇯🇵 · D. Bourgin🇫🇷 · K. Hagino🇯🇵 · F. Haas🇫🇷 · S. Courtin🇫🇷

    Preliminary experimental data for nucleon transfer reactions of the 40Ca+58Ni and 40Ca+64Ni systems are analyzed with the coupled- channels approach. It is shown that a simple treatment for the transfer in the coupled-channels method cannot reproduce simultaneously the transfer probabilities and the sub-barrier enhancement of fusion cross sections.

    Comments:
    5 pages, 2 figures, Proceeding of the "International Workshop on Multi facets of EOS and Clustering"
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1609.06428 [pdf]
    Nuovo Cim.C(2017)·1 citation
  2. 02

    [Submitted on 21 Sept 2016]

    Medium effects on heavy-flavour observables in high-energy nuclear collisions

    Andrea Beraudo🇮🇹

    The peculiar role of heavy-flavour observables in relativistic heavy-ion collisions is discussed. Produced in the early stage, and quarks cross the hot medium arising from the collision, interacting strongly with the latter, until they hadronize. Depending on the strength of the interaction heavy quarks may or not approach kinetic equilibrium with the plasma, tending in the first case to follow the collective flow of the expanding fireball. The presence of a hot deconfined medium may also affect heavy-quark hadronization, being possible for them to recombine with the surrounding light thermal partons, so that the final heavy-flavour hadrons inherit part of the flow of the medium. Here we show how it is possible to develop a complete transport setup allowing one to describe heavy-flavour production in high-energy nuclear collisions, displaying some major results one can obtain. Finally, the possibility that the formation of a hot deconfined medium even in small systems (high-multiplicity p-Au and d-Au collisions, so far) may affect also heavy-flavour observables is investigated.

    Comments:
    Invited talk at the conference QCD@Work 2016 - Martina Franca (Italy)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1609.06449 [pdf]
    EPJ Web Conf.(2016)·1 citation
  3. 03

    [Submitted on 21 Sept 2016]

    Systematic study on probable projectile-target combinations for the synthesis of the 120 superheavy nucleus

    K. P. Santhosh · V. Safoora

    Probable projectile-target combinations for the synthesis of superheavy element 120 have been studied taking Coulomb and proximity potential as the interaction barrier. The probabilities of compound nucleus formation, PCN for the projectile-target combinations found in the cold reaction valley of 120 are estimated. At energies near and above the Coulomb barrier, we have calculated the capture, fusion and evaporation residue cross sections for the reactions of all the probable projectile-target combinations so as to predict the most promising projectile-target combinations for the synthesis of SHE 120 in heavy ion fusion reactions. The calculated fusion and evaporation cross section for the more asymmetric (hotter) projectile-target combination is found to be higher than the less asymmetric (colder) combination. It can be seen from the nature of quasi-fission barrier height, mass asymmetry, probability of compound nucleus formation, survival probability and excitation energy, the systems Ar + No, Ar + No, Ca + Fm, Ca + Fm, Ti + Cf, Cr + Cm in the deep region I of cold reaction valley, and the systems Fe + Pu, Fe + Pu, Ni + U, Ni + U, Ni + U, Zn + Th in the other cold valleys are identified as the better projectile-target combinations for the synthesis of 120. Our prediction on the synthesis of 120 superheavy nuclei using the combinations Cr+Cm, Fe+Pu, Ni+U and Ti+Cf are compared with available experimental data and other theoretical predictions.

    Comments:
    46 pages, 27 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1609.06467 [pdf]
    PRC(2016)·21 citations
  4. 04

    [Submitted on 21 Sept 2016]

    Initial Temperature and Extent of Chemical Equilibration of Partons in Relativistic Collision of Heavy Nuclei

    Dinesh K. Srivastava🇮🇳 · Rupa Chatterjee🇮🇳 · Munshi G. Mustafa🇮🇳

    We emphasize that a knowledge of energy and entropy densities of quark gluon plasma - a thermalized de-confined matter, formed in relativistic heavy ion collisions fixes the formation temperature and the product of gluon fugacity and formation time uniquely, {\em provided} we know the relative fugacities of quarks and gluons. This also provides that a smaller formation time would imply larger fugacities for partons. Next we explore the limits of chemical equilibration of partons during the initial stages in relativistic collision of heavy nuclei. The experimentally measured rapidity densities of transverse energy and charged particle multiplicity at RHIC and LHC energies are used to estimate the energy and number densities with the assumption of formation of a thermally equilibrated quark gluon plasma which may be chemically equilibrated to the same or differing extents for quarks and gluons. The estimates are found to be very sensitive to the correction factor used for the Björken energy density for identifying it with the initial energy density. The extent of chemical equilibration near the end of the QGP phase is inferred by solving master equations by including the processes and along with expansion and cooling of the plasma. The possible consequences for invariant mass distribution of intermediate mass dileptons radiated from the plasma are discussed which could distinguish between different scenarios.

    Comments:
    13 page, 13 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.06496 [pdf]
    J.Phys.G(2018)·8 citations
  5. 05

    [Submitted on 20 Sept 2016] (cross-list from nucl-ex)

    Phenomenological Implications of the Spectra of and produced at LHC and RHIC

    Rudolph C. Hwa🇺🇸 · Lilin Zhu🇨🇳

    The data on the spectra of and at LHC can be presented in a format that shows exponential behavior up to GeV/c with the same slope for both particles and for nearly all centralities. They are empirical properties that are shared at lower energies with the inverse slope showing a power-law dependence on . The shared properties of the spectra are shown to emerge naturally from the recombination model. No flow is needed. We find experimental hints for the possibility that and are mostly produced in the ridge that are generated by minijets. Appropriate experimental test is suggested.

    Comments:
    4 pages, 4 figures, talk presented at Strangeness in Quark Matter, Berkeley, June 2016
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1609.06365 [pdf]
    J.Phys.Conf.Ser.(2017)·4 citations
  6. 06

    [Submitted on 23 Jun 2016] (cross-list from hep-ph)

    Fragmentation Functions of neutral mesons and with Laplace transform approach

    F. Taghavi-Shahri🇮🇷 · S. Atashbar Tehrani · M. Zareei🇮🇷

    With an analytical solutions of DGLAP evolution equations based on the Laplace transform method , we find the fragmentation functions (FFs) of neutral mesons, and at NLO approximation. We also calculated the total fragmentation functions of these mesons and compared them with experimental data and those from global fits. The results show a good agreements between our solutions and other models and also are compatible with experimental data.

    Comments:
    17 Pages, 4 Figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1609.06594 [pdf]
    Int.J.Mod.Phys.A(2016)·5 citations
  7. 07

    [Submitted on 21 Sept 2016] (cross-list from hep-ph)

    Analysis of nucleon electromagnetic form factors from light-front holographic QCD : The spacelike region

    Raza Sabbir Sufian🇺🇸 · Guy F. de Téramond🇨🇷 · Stanley J. Brodsky🇺🇸 · Alexandre Deur🇺🇸 · Hans Günter Dosch🇩🇪

    We present a comprehensive analysis of the spacelike nucleon electromagnetic form factors and their flavor decomposition within the framework of light-front holographic QCD. We show that the inclusion of the higher Fock components has a significant effect on the spin-flip elastic Pauli form factor and almost zero effect on the spin-conserving Dirac form factor. We present light-front holographic QCD results for the proton and neutron form factors at any momentum transfer range, including asymptotic predictions, and show that our results agree with the available experimental data with high accuracy. In order to correctly describe the Pauli form factor we need an admixture of a five quark state of about 30 in the proton and about 40 in the neutron. We also extract the nucleon charge and magnetic radii and perform a flavor decomposition of the nucleon electromagnetic form factors. The free parameters needed to describe the experimental nucleon form factors are very few: two parameters for the probabilities of higher Fock states for the spin-flip form factor and a phenomenological parameter , required to account for possible SU(6) spin-flavor symmetry breaking effects in the neutron, whereas the Pauli form factors are normalized to the experimental values of the anomalous magnetic moments. The covariant spin structure for the Dirac and Pauli nucleon form factors prescribed by AdS semiclassical gravity incorporates the correct twist scaling behavior from hard scattering and also leads to vector dominance at low energy.

    Comments:
    Appendix and asymptotic lines in the figures were not included in the previous version, Version published in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1609.06688 [pdf]
    PRD(2017)·81 citations

Affiliations

first authorsco-authorsvia INSPIRE