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Nuclear Theory·nucl-th

Wednesday·March 18, 2020

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Two-neutron halo structure of F

    N. Michel · J.G. Li · F.R. Xu · W. Zuo

    We apply the Gamow shell model to study F isotopes. As both inter-nucleon correlations and continuum coupling are properly treated therein, the structure shape of F at large distance can be analyzed precisely. For this, one-nucleon densities, root-mean square radii and correlation densities are calculated in neutron-rich fluorine isotopes. It is then suggested that F exhibits a two-neutron halo structure, built from both continuum coupling and nucleon-nucleon correlations.

    nucl-thPRC(2020)·38 citations
  2. 02

    Dispersion and suppression of sound near QCD critical point

    Md Hasanujjaman🇮🇳 · Mahfuzur Rahaman🇮🇳 · Abhijit Bhattacharyya🇮🇳 · Jan-e Alam🇮🇳

    We have used second order relativistic hydrodynamics equipped with equation of state which includes the critical point to study the propagation of perturbation in a relativistic QCD fluid. Dispersion relation for the sound wave has been derived to ascertain the fate of the perturbation in the fluid near the QCD critical end point (CEP). We observe that the threshold value of the wavelength of the sound in the fluid diverges at the CEP, implying that all the modes of the perturbations are dissipated at this point. Some consequences of the suppression of sound near the critical point have been discussed.

    nucl-thhep-phPRC(2020)·9 citations
  3. 03

    Ab initio study of and inclusive scattering in C: confronting the MiniBooNE and T2K CCQE data

    A. Lovato🇺🇸 · J. Carlson🇺🇸 · S. Gandolfi🇺🇸 · N. Rocco🇺🇸 · R. Schiavilla🇺🇸

    We carry out an ab initio calculation of the neutrino flux-folded inclusive cross sections, measured on C by the MiniBooNE and T2K collaborations in the charged-current quasielastic (CCQE) regime. The calculation is based on realistic two- and three-nucleon interactions, and on a realistic nuclear electroweak current with one-and two-nucleon terms that are constructed consistently with these interactions and reproduce low-energy electroweak transitions. Numerically exact quantum Monte Carlo methods are utilized to compute the nuclear weak response functions, by fully retaining many-body correlations in the initial and final states and interference effects between one- and two-body current contributions. We employ a nucleon axial form factor of the dipole form with or GeV, the latter more in line with a very recent lattice QCD determination. The calculated cross sections are found to be in good agreement with the neutrino data of MiniBooNE and T2K, and antineutrino MiniBooNE data, yielding a consistent picture of nuclei and their electroweak properties across a wide regime of energy and momenta.

    nucl-thhep-exhep-phPRX(2020)·87 citations
  4. 04

    Predictions for charmed nuclei based on forces inferred from lattice QCD simulations

    Johann Haidenbauer🇩🇪 · Andreas Nogga🇩🇪 · Isaac Vidaña🇮🇹

    Charmed nuclei are investigated utilizing and interactions that have been extrapolated from lattice QCD simulations at unphysical masses of -- MeV to the physical point using chiral effective field theory as guideline. Calculations of the energies of single-particle bound states for various charmed nuclei from Li to Bi are performed using a perturbative many-body approach. This approach allows one to determine the finite nuclei self-energy from which the energies of the different bound states can be obtained. Though the interaction inferred from the lattice results is only moderately attractive, it supports the existence of charmed nuclei. Already the lightest nucleus considered is found to be bound. The spin-orbit splitting of the p- and d-wave states turns out to be small, as in the case of single hypernuclei. Additional calculations based on the Faddeev-Yakubovsky equations suggest that also systems involving a baryon are likely to be bound, but exclude a bound He state.

    nucl-thhep-phEPJA(2020)·14 citations
  5. 05

    Quantal diffusion approach for multinucleon transfer processes in the Ni+Pb reactions: Toward the production of unknown neutron-rich nuclei

    Kazuyuki Sekizawa · Sakir Ayik

    Background: In recent years, substantial efforts have been made for the study of multinucleon transfer reactions at energies around the Coulomb barrier both experimentally and theoretically, aiming at the production of unknown neutron-rich heavy nuclei. It is crucial to provide reliable theoretical predictions based on microscopic theories with sufficient predictive power. Purpose: This paper aims to clarify the applicability of the quantal diffusion approach based on the stochastic mean-field (SMF) theory for multinucleon transfer processes. Isotope production cross sections are evaluated for the reactions of Ni+Pb at =268 MeV and Ni+Pb at =270 MeV and are compared with available experimental data. Methods: Three-dimensional time-dependent Hartree-Fock (TDHF) calculations are carried out for a range of initial orbital angular momenta with Skyrme SLy4d functional. Quantal diffusion equations, derived based on the SMF theory, for variances and covariance of neutron and proton numbers of reaction products are solved, with microscopic drift and diffusion coefficients obtained from the time evolution of occupied single-particle orbitals in TDHF. Secondary deexcitation processes, both particle evaporation and fission, are simulated by a statistical model, GEMINI++. Results: We find that the quantal diffusion approach reproduces the measured cross sections for abundant reaction products, including both projectile-like and target-like fragments, as well as fragments of transfer-induced fission. The results underline the importance of beyond mean-field effects in describing multinucleon transfer processes. We emphasize that the quantal diffusion description does not involve any adjustable parameters, once an energy density functional is given. Possible future directions are discussed. (Shortened due to the word limit)

    nucl-thnucl-exPRC(2020)·46 citations

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