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Nuclear Theory·nucl-th

Wednesday·February 17, 2021

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    On the QED corrections to elastic electron scattering at high momentum transfer

    D.H.Jakubassa-Amundsen

    Estimates of QED and dispersion effects on the cross section for elastic electron scattering from a 12C nucleus are provided for collision energies in the range of 120-450 MeV. While in general such corrections are smoothly varying with energy or scattering angle, they show structures in the vicinity of diffraction minima which are very sensitive to details of the theoretical models. This casts doubt on the assertion that the discrepancy between QED background-corrected experimental data and theory in these minima originates solely from dispersion.

    nucl-th3 citations
  2. 02

    Accessing the shape of atomic nuclei with relativistic collisions of isobars

    Giuliano Giacalone🇩🇪 · Jiangyong Jia🇺🇸 · Vittorio Somà🇫🇷

    Nuclides sharing the same mass number (isobars) are observed ubiquitously along the stability line. While having nearly identical radii, stable isobars can differ in shape, and present in particular different quadrupole deformations. We show that even small differences in these deformations can be probed by relativistic nuclear collisions experiments, where they manifest as deviations from unity in the ratios of elliptic flow coefficients taken between isobaric systems. Collider experiments with isobars represent, thus, a unique means to obtain quantitative information about the geometric shape of atomic nuclei.

    nucl-thhep-exhep-phnucl-exPRC(2021)·52 citations
  3. 03

    Semiclassical propagator approach for emission processes. I. Two body non-relativistic case

    S.A. Ghinescu · D.S. Delion

    We compare the coupled channels procedure to the semiclassical approach to describe two-body emission processes, in particular -decay, from deformed nuclei within the propagator method. We express the scattering amplitudes in terms of a propagator matrix, describing the effect of the deformed field, multiplied by the ratio between internal wave function components and irregular Coulomb waves. In the spherical case the propagator becomes diagonal and scattering amplitudes acquire the well-known form. We describe a more rigorous formulation of the 3D semiclassical approach, corresponding to deformed potentials, which leads to the exact results and we also compare them with the much simpler expressions given by the Angular Wentzel-Krames-Brillouin (AWKB) and Linearized WKB (LWKB) with its approximation, known as Fröman WKB (FWKB) method. We will show that LWKB approach is closer than AWKB to the exact coupled-channels formalism. An analysis of alpha-emission from ground states of even-even nuclei evidences the important role played by deformation upon the channel decay widths.

    nucl-th0 citations
  4. 04

    Variational theory combining number-projected BCS and coupled-cluster doubles

    V. V. Baran · J. Dukelsky

    The ground state pairing correlations in finite fermionic systems are described with a high degree of accuracy within a variational approach based on a combined coupled-cluster and particle-number-projected BCS ansatz. The flexibility of this symmetry-preserving wavefunction enables a unified picture valid from weak to strong coupling, both in small and large systems. The present variational approach consistently yields an energy upper bound while operating at the same level of precision of the non-variational particle-number projected Bogoliubov-coupled-cluster theory [Phys. Rev. C 99, 044301 (2019)].

    nucl-thcond-mat.supr-conPRC(2021)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE