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Nuclear Theory·nucl-th

Monday·May 6, 2024

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 01

    [Submitted on 3 May 2024]

    Ab initio calculation of hyper-neutron matter

    Hui Tong🇩🇪 · Serdar Elhatisari🇩🇪 · Ulf-G. Meißner🇩🇪

    The equation of state (EoS) of neutron matter plays a decisive role in our understanding of the properties of neutron stars as well as the generation of gravitational waves in neutron star mergers. At sufficient densities, it is known that the appearance of hyperons generally softens the EoS, thus leading to a reduction in the maximum mass of neutron stars well below the observed values of about 2 solar masses. Even though repulsive three-body forces are known to solve this so-called "hyperon puzzle", so far performing \textit{ab initio} calculations with a substantial number of hyperons has remained elusive. In this work, we address this challenge by employing simulations based on Nuclear Lattice Effective Field Theory with up to 232 neutrons (pure neutron matter) and up to 116 hyperons (hyper-neutron matter) in a finite volume. We introduce a novel auxiliary field quantum Monte Carlo algorithm, allowing us to simulate for both pure neutron matter and hyper-neutron matter systems up to 5 times the density of nuclear matter using a single auxiliary field without any sign oscillations. Also, for the first time in {\em ab initio} calculations, we not only include two-body and three-body forces, but also and interactions. Consequently, we determine essential astrophysical quantities such as the mass-radius relation, the speed of sound and the tidal deformability of neutron stars. Our findings also confirm the existence of the -Love- relation, which gives access to the moment of inertia of the neutron star.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2405.01887 [pdf]
    Sci.Bull.(2025)·31 citations
  2. 02

    [Submitted on 3 May 2024]

    Systematic study of capture thresholds with time dependent Hartree-Fock theory

    Hong Yao · Hui Yang · Ning Wang

    With the time dependent Hartree-Fock (TDHF) theory, capture thresholds for 144 fusion systems with nearly spherical nuclei are systematically studied for the first time. We find that for the reactions between doubly-magic nuclei, the calculated are very close to the extracted barrier heights from measured fusion excitation functions. For the fusion reactions with nearly spherical nuclei, an excitation energy of about 1 MeV at the capture position need to be considered to better reproduce the data due to the lower excitation threshold. The rms deviation with respect to the barrier heights is only 1.43 MeV from the TDHF calcualtions, which is smaller than the results from three empirical nuclear potentials. Together with Siwek-Wilczyński formula in which the three parameters are determined by the TDHF calculations, the measured fusion cross sections at energies around the barriers can be well reproduced for seven fusion reactions Ca+Ca, O+Pb, Ca+Zr, Si+Zr and Sn+Ca.

    Comments:
    8 figures, to appear in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2405.01985 [pdf]
    PRC(2024)·8 citations
  3. 03

    [Submitted on 3 May 2024]

    Dynamics of dilute nuclear matter with light clusters and in-medium effects

    Rui Wang🇮🇹 · Stefano Burrello🇮🇹 · Maria Colonna🇮🇹 · Francesco Matera🇮🇹

    We investigate the dynamics of dilute systems composed of nucleons and light clusters within a linear response approach, taking into account the in-medium Mott effects on cluster appearance, through a density-dependent momentum cut-off. We find that spinodal instabilities and associated growth rates are severely affected by the presence of light clusters and, in particular, by the treatment of in-medium effects, foreshadowing intriguing consequences for fragment formation in heavy-ion collisions and in the broader astrophysical context.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2405.02157 [pdf]
    PRC(2024)·11 citations
  4. 04

    [Submitted on 3 May 2024]

    Flow harmonic correlations via multi-particle symmetric and asymmetric cumulants in Au+Au collisions at \(\sqrt{s_{NN}}\) = 200 GeV

    Kaiser Shafi🇮🇳 · Prabhupada Dixit🇮🇳 · Sandeep Chatterjee🇮🇳 · Md. Nasim🇮🇳

    We study multi-particle azimuthal correlations in Au+Au collisions at = 200 GeV. We use initial conditions obtained from a Monte-Carlo Glauber model and evolve them within a viscous relativistic hydrodynamics framework that eventually gives way to a transport model in the late hadronic stage of the evolution. We compute the multi-particle symmetric and asymmetric cumulants and present the results for their sensitivity to the shear and bulk viscosities during the hydrodynamic evolution. We also check their sensitivity to resonance decay and hadronic interactions. We demonstrate that while some of these observables are more sensitive to transport properties than traditional flow observables, others are less sensitive, making them suitable for studying different stages of the evolution.

    Comments:
    12 pages, 7 figures and 4 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2405.02245 [pdf]
    PRC·1 citation
  5. 05

    [Submitted on 3 May 2024]

    Response of strongly coupled fermions on classical and quantum computers

    John Novak · Manqoba Q. Hlatshwayo · Elena Litvinova

    Studying the response of quantum systems is essential for gaining deeper insights into the fundamental nature of matter and its behavior in diverse physical contexts. Computation of nuclear response is critical for many applications, but its spectroscopically accurate description in medium-heavy nuclei in wide energy ranges remains particularly challenging because of the complex nature of nuclear quantum states in the high-level-density regime. Herein, we push the limits of configuration complexity in the classical computation of the nuclear response and present an algorithm with a quantum benefit for treating complex configurations. The classical computational method of approaching spectroscopic accuracy is implemented for medium-heavy nuclei and pioneered for the dipole response of 120Sn, while the quantum algorithm reaching the exact solution is realized for the Lipkin Hamiltonian to unravel the emergence of collectivity at strong coupling.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); Quantum Physics (quant-ph)
    arXiv:
    2405.02255 [pdf]
    5 citations

Affiliations

first authorsco-authorsvia INSPIRE