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Nuclear Theory·nucl-th

Friday·March 12, 2021

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Ab initio calculations of electric dipole moments of light nuclei

    Paul Froese🇨🇦 · Petr Navratil🇨🇦

    In any finite system, the presence of a non-zero permanent electric dipole moment (EDM) would indicate CP violation beyond the small violation predicted in the Standard Model. Here, we use the ab initio no-core shell model (NCSM) framework to theoretically investigate the magnitude of the nuclear EDM. We calculate EDMs of several light nuclei using chiral two- and three-body interactions and a PT-violating Hamiltonian based on a one-meson-exchange model. We present a benchmark calculation for He, as well as results for the more complex nuclei Li, Be, B, C, N, and F. Our results suggest that different nuclei can be used to probe different terms of the PT violating interaction. These calculations allow us to suggest which nuclei may be good candidates in the search for a measurable permanent electric dipole moment.

    nucl-thhep-thPRC(2021)·28 citations
  2. 02

    Weinberg's proposal of 1990: A very personal view

    R. Machleidt🇺🇸

    My personal encounter with Weinberg's proposal of 1990 was a really entertaining one: My collaborator David Entem and I had embarked to show that Weinberg's idea, though smart and beautiful, was essentially useless in practice (like so many of those genius ideas of the 1980s where people claimed to have "derived the nuclear force from QCD"). However, in trying to do so, we showed the opposite; namely, we showed that Weinberg's idea worked better than allowed by any reasonable means.

    nucl-thhep-phnucl-exphysics.hist-phFew Body Syst.(2021)·7 citations
  3. 03

    Search for a viable nucleus-nucleus potential for heavy-ion nuclear reactions

    T.Nandi · D.K. Swami · P.S. Damodara Gupta · Yash Kumar · S. Chakraborty · H.C. Manjunatha

    We have constructed an empirical formulae for the fusion and interaction barriers using experimental values available till date. The fusion barriers so obtained have been compared with different model predictions based on the proximity, Woods-Saxon and double folding potentials along with several empirical formulas, time dependent Hartree-Fock theories, and the experimental results. The comparison allows us to find the best model, which is nothing but the present empirical formula only. Most remarkably, the fusion barrier and radius show excellent consonance with the experimental findings for the reactions meant for synthesis of the superheavy elements also. Furthermore, it is seen that substitution of the predicted fusion barrier and radius in classic Wong formula [C. Wong, Phys. Rev. Lett. {31}, 766 (1973)] for the total fusion cross sections satisfies very well with the experiments. Similarly, current interaction barrier predictions have also been compared well with a few experimental results available and Bass potential model meant for the interaction barrier predictions. Importantly, the present formulae for the fusion as well as interaction barrier will have practical implications in carrying out the physics research near the Coulomb barrier energies. Furthermore, present fusion barrier and radius provide us a good nucleus-nucleus potential useful for numerous theoretical applications.

    nucl-thPramana(2022)·6 citations
  5. 05

    Ab initio computation of the longitudinal response function in Ca

    J. E. Sobczyk🇩🇪 · B. Acharya🇩🇪 · S. Bacca🇩🇪 · G. Hagen🇺🇸

    We present a consistent \emph{ab initio} computation of the longitudinal response function in Ca using the coupled-cluster and Lorentz integral transform methods starting from chiral nucleon-nucleon and three-nucleon interactions. We validate our approach by comparing our results for in He and the Coulomb sum rule in Ca against experimental data and other calculations. For in Ca we obtain a very good agreement with experiment in the quasi-elastic peak up to intermediate momentum transfers, and we find that final state interactions are essential for an accurate description of the data. This work presents a milestone towards \emph{ab initio} computations of neutrino-nucleus cross sections relevant for experimental long-baseline neutrino programs.

    nucl-thhep-exhep-phnucl-exPRL(2021)·57 citations

Affiliations

first authorsco-authorsvia INSPIRE