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Nuclear Theory·nucl-th

Wednesday·July 21, 2021

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    Study on higher moments of net-charge multiplicity distributions using a multiphase transport model

    Ling Huang🇨🇳 · Guo-Liang Ma🇨🇳

    The moments and moment products of conserved charges are believed to be sensitive to critical fluctuations, which have been adopted in determining the QCD critical point. Using a dynamical multiphase transport model, we reproduce the centrality and energy dependences of moments and moment products of net-charge multiplicity distributions in Au+Au collisions measured by the Beam Energy Scan program at the RHIC. No non-monotonic energy dependence is observed. We infer that the moment products develop during the dynamical evolution of heavy-ion collisions. The observed difference based on the expectation of the Poisson baseline indicates a positive two-particle correlation between positively and negatively charged particles, which can arise from different dynamical processes at different stages. Therefore, to adopt moments and moment products of net-charge multiplicity distributions in determining the QCD critical point of relativistic heavy-ion collisions, it is essential to take the dynamical evolution.

    nucl-thhep-phnucl-exCPC(2021)·6 citations
  2. 02

    Hindrance in heavy-ion fusion for lighter systems of astrophysical interest

    Vinay Singh · Joydev Lahiri · Partha Roy Chowdhury · D. N. Basu

    The hindrance in fusion of heavy-ion reactions crops up in the region of extreme sub-barrier energies. This phenomenon can be effectively analyzed using a simple diffused barrier formula derived assuming a Gaussian distribution of fusion barrier heights. Folding the Gaussian barrier distribution with the classical expression for the fusion cross section for a fixed barrier, the fusion cross section is obtained. The energy dependence of the fusion cross section provides good description to the existing data on sub-barrier heavy-ion fusion for lighter systems of astrophysical interest. Using this simple formula, an analysis has been presented from O + O to C + Pt, all of which were measured down to 10 b. The agreement of the present analysis with the measured values is better than those calculated even from the sophisticated coupled channels calculations. The relatively smooth variation of the three parameters of this formula implies that it may be exploited to estimate the excitation function or to extrapolate cross sections for pairs of interacting nuclei which are yet to be measured. Possible extensions of the present methodology and its limitations have also been discussed.

    nucl-thIndian J.Phys.(2023)·4 citations
  3. 03

    Testing the Inverted Neutrino Mass Ordering with Neutrinoless Double-Beta Decay

    Matteo Agostini🇬🇧 · Giovanni Benato🇮🇹 · Jason A. Detwiler🇺🇸 · Javier Menéndez🇪🇸 · Francesco Vissani🇮🇹

    We quantify the extent to which future experiments will test the existence of neutrinoless double-beta decay mediated by light neutrinos with inverted-ordered masses. While it remains difficult to compare measurements performed with different isotopes, we find that future searches will fully test the inverted ordering scenario, as a global, multi-isotope endeavor. They will also test other possible mechanisms driving the decay, including a large uncharted region of the allowed parameter space assuming that neutrino masses follow the normal ordering.

    ↳ hep-phhep-exnucl-exnucl-thPRC(2021)·32 citations
  4. 04

    Imposing multi-physics constraints at different densities on the Neutron Star Equation of State

    Suprovo Ghosh🇮🇳 · Debarati Chatterjee🇮🇳 · Jürgen Schaffner-Bielich🇩🇪

    Neutron star matter spans a wide range of densities, from that of nuclei at the surface to exceeding several times normal nuclear matter density in the core. While terrestrial experiments, such as nuclear or heavy-ion collision experiments, provide clues about the behaviour of dense nuclear matter, one must resort to theoretical models of neutron star matter to extrapolate to higher density and finite neutron/proton asymmetry relevant for neutron stars. In this work, we explore the parameter space within the framework of the Relativistic Mean Field model allowed by present uncertainties compatible with state-of-the-art experimental data. We apply a cut-off filter scheme to constrain the parameter space using multi-physics constraints at different density regimes: chiral effective field theory, nuclear and heavy-ion collision data as well as multi-messenger astrophysical observations of neutron stars. Using the results of the study, we investigate possible correlations between nuclear and astrophysical observables.

    ↳ astro-ph.HEnucl-thEPJA(2022)·52 citations

Affiliations

first authorsco-authorsvia INSPIRE