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Nuclear Theory·nucl-th

Wednesday·February 1, 2023

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    Dense Nuclear Matter Equation of State from Heavy-Ion Collisions

    Agnieszka Sorensen🇺🇸 · Kshitij Agarwal🇩🇪 · Kyle W. Brown🇺🇸 · Zbigniew Chajęcki🇺🇸 · Paweł Danielewicz🇺🇸 · Christian Drischler🇺🇸 · Stefano Gandolfi🇺🇸 · Jeremy W. Holt🇺🇸 · Matthias Kaminski🇺🇸 · Che-Ming Ko🇺🇸 · Rohit Kumar🇺🇸 · Bao-An Li🇺🇸 and 124 other authors

    The nuclear equation of state (EOS) is at the center of numerous theoretical and experimental efforts in nuclear physics. With advances in microscopic theories for nuclear interactions, the availability of experiments probing nuclear matter under conditions not reached before, endeavors to develop sophisticated and reliable transport simulations to interpret these experiments, and the advent of multi-messenger astronomy, the next decade will bring new opportunities for determining the nuclear matter EOS, elucidating its dependence on density, temperature, and isospin asymmetry. Among controlled terrestrial experiments, collisions of heavy nuclei at intermediate beam energies (from a few tens of MeV/nucleon to about 25 GeV/nucleon in the fixed-target frame) probe the widest ranges of baryon density and temperature, enabling studies of nuclear matter from a few tenths to about 5 times the nuclear saturation density and for temperatures from a few to well above a hundred MeV, respectively. Collisions of neutron-rich isotopes further bring the opportunity to probe effects due to the isospin asymmetry. However, capitalizing on the enormous scientific effort aimed at uncovering the dense nuclear matter EOS, both at RHIC and at FRIB as well as at other international facilities, depends on the continued development of state-of-the-art hadronic transport simulations. This white paper highlights the essential role that heavy-ion collision experiments and hadronic transport simulations play in understanding strong interactions in dense nuclear matter, with an emphasis on how these efforts can be used together with microscopic approaches and neutron star studies to uncover the nuclear EOS.

    nucl-thnucl-exPPNP(2024)·280 citations
  2. 02

    Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: 210Po, 212Rn, and 213Fr

    Divya Arora · P. Sugathan · A. Chatterjee

    Dissipative dynamics of nuclear fission is a well confirmed phenomenon described either by a Kramers-modified statistical model or by a dynamical model employing the Langevin equation. Though dynamical models as well as statistical models incorporating fission delay are found to explain the measured fission observables in many studies, it nonetheless shows conflicting results for shell closed nuclei in the mass region 200. Analysis of recent data for neutron shell closed nuclei in excitation energy range 4080 MeV failed to arrive at a satisfactory description of the data and attributed the mismatch to shell effects and/or entrance channel effects, without reaching a definite conclusion. In the present work we show that a well established stochastic dynamical code simultaneously reproduces the available data of pre-scission neutron multiplicities, fission and evaporation residue excitation functions for neutron shell closed nuclei Po and Rn and their isotopes Po and Rn without the need for including any extra shell or entrance channel effects. The calculations are performed by using a phenomenological universal friction form factor with no ad-hoc adjustment of model parameters. However, we note significant deviation, beyond experimental errors, in some cases of Fr isotopes.

    nucl-thnucl-exCPC(2023)·2 citations
  3. 03

    Identical Bands Around the Isobaric Rare Earth Even-Even Nuclei with the Mass Number A = 164

    M. A. Abdelsalam · H. A. Ghanim · M. Kotb · A. M. Khalaf

    Eight pairs of rare earth normally deformed nuclei around the isobaric nuclei with A = 164 and have identical values of F-spin have been studied. These pairs of identical bands cover 16 mass units and are classified. We suggested a theoretical collective rotational formula containing three parameters (CRF3) as an extended version of Bohr-Mottelson model to calculate the ground state positive parity excitation energies. Also, the sd-version of the interacting boson model (IBM) has been used to describe the nuclear shapes by using the intrinsic coherent-state. The optimized models parameters for each nucleus are adjusted by using a simulation search program to minimize the root mean square deviation between the theoretical calculation and experimental excitation energies. The best adopted model parameters of the CRF3 are used to calculate the rotational frequencies, the kinematic and dynamic moments of inertia and the evolution of with increasing hw are systematically analyzed. A smooth gradual increase in both moments of inertia was seen. The calculated results agree excellently with the experimental ones which give strong support to the suggested CRF3. The adopted IBM parameters are used to calculate the potential energy surfaces which describe the nuclear deformation. The correlation quantities which identify the IB are extracted, exhibit identical excitation energies and energy ratios in their ground state rotational bands.

    nucl-thPhys.Atom.Nucl.(2023)·1 citation

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first authorsco-authorsvia INSPIRE