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Nuclear Theory·nucl-th

Wednesday·August 30, 2023

13 papers—4 primary·9 cross-listed

All13Primary4Cross-lists9
  1. 01

    Probing Quarkyonic Matter in Neutron Stars with the Bayesian Nuclear-Physics Multi-Messenger Astrophysics Framework

    Peter T. H. Pang🇳🇱 · Lars Sivertsen🇺🇸 · Rahul Somasundaram🇺🇸 · Tim Dietrich🇩🇪 · Srimoyee Sen🇺🇸 · Ingo Tews🇺🇸 · Michael Coughlin🇺🇸 · Chris Van Den Broeck🇳🇱

    The interior of neutron stars contains matter at the highest densities realized in our Universe. Interestingly, theoretical studies of dense matter, in combination with the existence of two solar mass neutron stars, indicate that the speed of sound has to increase to values well above the conformal limit () before decreasing again at higher densities. The decrease could be explained by either a strong first-order phase transition or a cross-over transition from hadronic to quark matter. The latter scenario leads to a pronounced peak in the speed of sound reaching values above the conformal limit, naturally explaining the inferred behavior. In this work, we use the Nuclear-Physics Multi-Messenger Astrophysics framework \textsc{NMMA} to compare predictions of the quarkyonic matter model with astrophysical observations of neutron stars, with the goal of constraining model parameters. Assuming quarkyonic matter to be realized within neutron stars, we find that there can be a significant amount of quarks inside the core of neutron stars with masses in the two solar mass range, amounting to up to , contributing of the total mass. Furthermore, for the quarkyonic matter model investigated here, the radius of a neutron star would be km, at credibility, without (with) the inclusion of AT2017gfo.

    nucl-thastro-ph.HEPRC(2024)·47 citations
  2. 02

    Impact of quadrupole deformation on intermediate-energy heavy-ion collisions

    Xiao-Hua Fan🇨🇳 · Zu-Xing Yang🇯🇵 · Peng-Hui Chen🇨🇳 · Shunji Nishimura🇯🇵 · Zhi-Pan Li🇨🇳

    This study employs the isospin-dependent Boltzmann-Uehling-Uhlenbeck model to simulate intermediate-energy heavy-ion collisions between prolate nuclei Mg. The emphasis is on investigating the influence of centrality and orientation in several collision scenarios. The final-state particle multiplicities and anisotropic flows are primarily determined by the eccentricity and the area of the initial overlap. This not only provides feedback on the collision systems, but also, to some extent, provides a means to explore the fine structure inside deformed nuclei. Additionally, non-polarized collisions have been further discussed. These results contribute to the understanding of the geometric effects in nuclear reactions, and aid in the exploration of other information on reaction systems, such as the equation of state and nuclear high-momentum tail.

    nucl-thPRC(2023)·9 citations
  3. 03

    Shape coexistence in even-even nuclei: A theoretical overview

    Dennis Bonatsos · Andriana Martinou · S.K. Peroulis · T.J. Mertzimekis · N. Minkov

    The last decade has seen a rapid growth of our understanding of the microscopic origins of shape coexistence, assisted by the new data provided by the modern radioactive ion beam facilities built worldwide. Islands of the nuclear chart in which shape coexistence can occur have been identified, and the different microscopic particle-hole excitation mechanisms leading to neutron-induced or proton-induced shape coexistence have been clarified. The relation of shape coexistence to the islands of inversion, appearing in light nuclei, to the new spin-aligned phase appearing in N=Z nuclei, as well as to shape/phase transitions occurring in medium mass and heavy nuclei, has been understood. In the present review, these developments are considered within the shell model and mean field approaches, as well as by symmetry methods. In addition, based on systematics of data, as well as on symmetry considerations, quantitative rules are developed, predicting regions in which shape coexistence can appear, as a possible guide for further experimental efforts, which can help in improving our understanding of the details of the nucleon-nucleon interaction, as well as of its modifications occurring far from stability.

    nucl-thAtoms(2023)·43 citations
  4. 04

    A Quantum Simulation Approach to Implementing Nuclear Density Functional Theory via Imaginary Time Evolution

    Yang Hong Li🇬🇧 · Jim Al-Khalili🇬🇧 · Paul Stevenson🇬🇧

    The quantum imaginary time evolution (QITE) algorithm is a direct implementation of the classical imaginary time evolution algorithm on quantum computer. We implement the QITE algorithm for the case of nuclear Hartree-Fock equations in a formalism equivalent to nuclear density functional theory. We demonstrate the algorithm in the case of the helium-4 nucleus with a simplified effective interaction of the Skyrme kind and demonstrate that the QITE, as implemented on simulated quantum computer, gives identical results to the classical algorithm.

    nucl-thPRC(2024)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE