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Nuclear Theory·nucl-th

Monday·July 15, 2024

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    [Submitted on 12 Jul 2024]

    Neutron matter from local chiral effective field theory interactions at large cutoffs

    I. Tews🇺🇸 · R. Somasundaram🇺🇸 · D. Lonardoni🇺🇸 · H. Göttling🇩🇪 · R. Seutin🇩🇪 · J. Carlson🇺🇸 · S. Gandolfi🇺🇸 · K. Hebeler🇩🇪 · A. Schwenk🇩🇪

    Neutron matter is an important many-body system that provides valuable constraints for the equation of state (EOS) of neutron stars. Neutron-matter calculations employing chiral effective field theory (EFT) interactions have been extensively used for this purpose. Among the various many-body methods, quantum Monte Carlo (QMC) methods stand out due to their nonperturbative nature and the achievable precision. However, QMC methods require local interactions as input, which leads to the appearance of stronger regulator artifacts compared to non-local interactions. To circumvent this, we employ large-cutoff interactions derived within chiral EFT () for studies of pure neutron matter. These interactions have been adjusted to nucleon-nucleon scattering phase shifts, the triton binding energy, as well as the triton -decay half-life. We find that regulator artifacts significantly decrease with increasing cutoff, leading to a significant reduction of uncertainties in the neutron-matter EOS. We discuss implications for the symmetry energy and demonstrate how our new calculations lead to a reduction in the theoretical uncertainty of predicted neutron-star radii by up to 30\% for low-mass stars.

    Comments:
    8 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2407.08979 [pdf]
    PRResearch(2025)·28 citations
  2. 02

    [Submitted on 12 Jul 2024]

    Emergence of High-Order Deformation in Rotating Transfermium Nuclei: A Microscopic Understanding

    F. F. Xu · Y. K. Wang · Y. P. Wang · P. Ring · P. W. Zhao

    The rotational properties of the transfermium nuclei are investigated in the full deformation space by implementing a shell-model-like approach in the cranking covariant density functional theory on a three-dimensional lattice, where the pairing correlations, deformations, and moments of inertia are treated in a microscopic and self-consistent way. The kinematic and dynamic moments of inertia of the rotational bands observed in the transfermium nuclei No, No, Rf, and Rf are well reproduced without any adjustable parameters using a well-determined universal density functional. It is found for the first time that the emergence of the octupole deformation should be responsible for the significantly different rotational behavior observed in No and No. The present results provide a microscopic solution to the long-standing puzzle on the rotational behavior in No isotopes, and highlight the risk of investigating only the hexacontetrapole () deformation effects in rotating transfermium nuclei without considering the octupole deformation.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2407.08996 [pdf]
    PRL(2024)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE