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Nuclear Theory·nucl-th

Monday·May 15, 2023

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    Triplet paring in neutron matter

    Eckhard Krotscheck · Panagiota Papakonstantinou · Jiawei Wang

    The presence of superfluidity in neutron star interiors can affect the cooling of neutron stars in intricate ways, enhancing certain mechanisms and suppressing others. Model calculations employing realistic nuclear potentials in Bardeen-Cooper-Schrieffer theory generally suggest the development of a P-F pairing gap, and therefore the presence of superfluidity in dense neutron-star matter.Improved models that go beyond conventional mean-field calculations by including polarization effects suggest a suppression of the triplet gap. We have evaluated the pairing interaction by summing the ``parquet'' Feynman diagrams which include both ladder and ring diagrams systematically, {\em plus\} a set of important non-parquet diagrams, making this the most comprehensive diagram-based approach presently available. Our results suggest a radical suppression of the P-F triplet pairing gap and an enhancement of P pairing.

    nucl-thApJ(2023)·15 citations
  2. 02

    Bayesian analysis of muon capture on deuteron in chiral effective field theory

    Alex Gnech🇮🇹 · Laura Elisa Marcucci🇮🇹 · Michele Viviani🇮🇹

    We compute the muon capture on deuteron in the doublet hyperfine state for a variety of nuclear interactions and consistent nuclear currents. Our analysis includes a detailed examination of the theoretical uncertainties coming from different sources: the single-nucleon axial form factor, the truncation of the interaction and current chiral expansion, and the model dependence. Moreover, we study the impact of the use of different power counting scheme for the electroweak currents on the truncation error. To estimate the truncation error of the chiral expansion of interactions and currents we use the most modern techniques based on Bayesian analysis. This method enables us to give a clear statistical interpretation of the computed theoretical uncertainties. Finally, we provide the differential capture rate as function of the kinetic energy of the outgoing neutron which may be measured in future experiments. Our recommended theoretical value for the total doublet capture rate is s ( confidence level). We calculated also the capture rate in the quartet hyperfine state, which turns out to be in the range s depending on the adopted nuclear interaction.

    nucl-thPRC(2024)·13 citations
  3. 03

    Coupled-cluster theory for strong entanglement in nuclei

    Z. H. Sun · G. Hagen · T. Papenbrock

    Atomic nuclei can exhibit shape coexistence and multi-reference physics that enters in their ground states, and to accurately capture the ensuing correlations and entanglement is challenging. We address this problem by applying single-reference coupled-cluster theory based on spherical and deformed reference states and the tailored coupled-cluster method. The latter combines configuration interaction to capture static correlations with coupled-cluster theory for dynamic correlations. We compute the atomic nuclei C, Si, and Ni and find that the tailored coupled-cluster method and the single-reference approach based on a deformed Hartree-Fock state yield the most accurate results.

    nucl-thPRC(2023)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE