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Nuclear Theory·nucl-th

Thursday·May 11, 2023

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    CREX- and PREX-II-motivated relativistic interactions and their implications for the bulk properties of nuclear matter and neutron stars

    Mukul Kumar🇮🇳 · Sunil Kumar🇮🇳 · Virender Thakur🇮🇳 · Raj Kumar🇮🇳 · B. K. Agrawal🇮🇳 · Shashi K. Dhiman🇮🇳

    We investigate the implications of parity-violating electron scattering experiment on neutron skin thickness of Ca (CREX) and Pb (PREX-II) data on the bulk properties of finite nuclei, nuclear matter, and neutron stars. The neutron skin thickness from the CREX and PREX-II data is employed to constrain the parameters of relativistic mean field models which includes different non-linear, self and cross-couplings among isoscalar-scalar , isoscalar-vector , isovector-scalar and isovector-vector meson fields up to the quartic order. Three parametrizations of RMF model are proposed by fitting CREX, PREX-II and both CREX as well as PREX-II data to assess their implications. A covariance analysis is performed to assess the theoretical uncertainties of model parameters and nuclear matter observables along with correlations among them. The RMF model parametrization obtained with the CREX data acquires much smaller value of symmetry energy (J= 28.97 0.99 MeV), its slope parameter (L= 30.61 MeV) in comparison to those obtained with PREX-II data. The neutron star properties are studied by employing the equations of state (EoSs) composed of nucleons and leptons in equilibrium.

    nucl-thastro-ph.HEPRC(2023)·35 citations
  2. 02

    Constraining the chirally motivated - models with the photoproduction mass spectra

    A. Cieply🇨🇿 · P. C. Bruns🇨🇿

    The paper presents a first time attempt on a combined fit of the low-energy data and the photoproduction mass spectra, performed without fixing the meson-baryon rescattering amplitudes to a specific coupled channels model obtained from fitting exclusively the data. The formalism adopted to describe the photoproduction process is based on chiral perturbation theory and employs a limited number of free parameters. The achieved description of the photoproduction mass distributions is not quite satisfactory, leaving a room for improving the photo-kernel construction, but still provides additional constraints on the positions of the poles. In particular, the presented models tend to limit the mass of the lower pole and yield a larger width of the related pole at a higher mass.

    nucl-thhep-phNPA(2024)·4 citations
  3. 03

    Constraint of pionless EFT using two-nucleon spectra from lattice QCD

    William Detmold🇺🇸 · Fernando Romero-López🇺🇸 · Phiala E. Shanahan🇺🇸

    Finite-volume pionless effective field theory (FVEFT) at next-to-leading order (NLO) is used to analyze the two-nucleon lattice QCD spectrum of Ref.~\cite{Amarasinghe:2021lqa}, performed at quark masses corresponding to a pion mass of approximately MeV. Specifically, the effective theory is formulated in finite volume, and variational sets of wave functions are optimized using differential programming. Using these wave functions projected to the appropriate finite-volume symmetry group, variational bounds from FVEFT are obtained for the ground state, as well as excited states. By comparison with the lattice QCD GEVP spectrum, different low energy constants (LECs) are constrained. Relativistic corrections are incorporated, allowing for the extractions of NLO LECs, as well as the leading --wave mixing term in the deuteron channel.

    nucl-thhep-lathep-phPRD(2023)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE