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Nuclear Theory·nucl-th

Thursday·July 1, 2021

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    Ratio of photon anisotropic flow in relativistic heavy ion collisions

    Rupa Chatterjee🇮🇳 · Pingal Dasgupta🇨🇳

    The dependent elliptic and triangular flow parameters of direct photons are known to be dominated by thermal radiations. The non-thermal contributions dilute the photon anisotropic flow by adding extra weight factor in the calculation. The discrepancy between experimental photon anisotropic flow data and results from theoretical model calculations is not well understood even after significant developments in the model calculations as well as in the experimental analysis. We show that the ratio of photon can be a potential observable in this regard by minimizing the uncertainties arising due to the non-thermal contributions. We calculate the of photons as a function of from heavy ion collisions at RHIC and compare the results with available experimental data. The ratio does not change significantly in the region GeV. However, it rises towards smaller ( GeV) values. The ratio is found to be larger for peripheral collisions than for central collisions. In addition, it is found to be sensitive to the initial formation time and the final freeze-out temperature at different regions unlike the individual anisotropic flow parameters. We show that the photon and along with the results may help us constraining the initial conditions.

    nucl-thnucl-exPRC(2021)·10 citations
  2. 02

    Comparison of fission and quasi-fission modes

    C. Simenel · P. McGlynn · A.S. Umar · K. Godbey

    Quantum shell effects are known to affect the formation of fragments in nuclear fission. Shell effects also affect quasi-fission reactions occurring in heavy-ion collisions. Systematic time-dependent Hartree-Fock simulations of 50Ca+176Yb collisions show that the mass equilibration between the fragments in quasi-fission is stopped when they reach similar properties to those in the asymmetric fission mode of the 226Th compound nucleus. Similar shell effects are then expected to determine the final repartition of nucleons between the nascent fragments in both mechanisms. Future experimental studies that could test these observations are discussed.

    nucl-thnucl-exPLB(2021)·31 citations
  3. 03

    Impact of three-nucleon forces on gravitational wave emission from neutron stars

    Lucas Tonetto🇮🇹 · Andrea Sabatucci🇮🇹 · Omar Benhar🇮🇹

    The detection of gravitational radiation, emitted in the aftermath of the excitation of neutron star quasi-normal modes, has the potential to provide unprecedented access to the properties of matter in the star interior, and shed new light on the dynamics of nuclear interactions at microscopic level. Of great importance, in this context, will be the sensitivity to themodelling of three-nucleon interactions, which are known to play a critical role in the high-density regime. We report the results of a calculation of the frequencies and damping times of the fundamental mode, carried out using the equation of state of Akmal, Pandharipande and Ravenhall as a baseline, and varying the strength of the isoscalar repulsive term the Urbana IX potential within a range consistent with multimessenger astrophysical observations. The results of our analysis indicate that repulsive three-nucleon interactions strongly affect the stiffness of the equation of state, which in turn determines the pattern of the gravitational radiation frequencies, largely independent of the mass of the source. The observational implications are also discussed.

    nucl-thastro-ph.HEPRD(2021)·6 citations
  4. 04

    Investigation of neutron transfer in Li+Sn reaction

    V. V. Parkar · A. Parmar · Prasanna M. · V. Jha · S. Kailas

    The relative importance of neutron transfer and breakup process in reaction around Coulomb barrier energies have been studied for the Li+Sn system. Coupled channel calculations have been performed to understand the one neutron stripping and pickup cross sections along with the breakup in the Li+Sn system. The systematics of one and two neutron striping and pickup cross sections with Li projectile on several targets show an approximate universal behaviour that have been explained by a simple model. Complete reaction mechanism have been studied by comparing the reaction cross sections with cumulative cross sections of total fusion and one neutron transfer.

    nucl-thnucl-exPRC(2021)·14 citations

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first authorsco-authorsvia INSPIRE