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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

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first authorsco-authorsvia INSPIRE