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Nuclear Theory·nucl-th

Monday·September 13, 2021

3 papers—2 primary·1 cross-listed

All3Primary2Cross-lists1
  1. 01

    [Submitted on 10 Sept 2021]

    Exploring the halo character and dipole response in the dripline nucleus F

    G. Singh · Jagjit Singh · J. Casal · L. Fortunato

    Lying at the lower edge of the `island of inversion', neutron-rich Fluorine isotopes (F) provide a curious case to study the configuration mixing in this part of the nuclear landscape. Recent studies have suggested that a prospective two-neutron halo in the dripline nucleus F could be linked to the occupancy of the intruder configurations. Focusing on configuration mixing, matter radii and neutron-neutron () correlations in the ground-state of F, we explore various scenarios to analyze its possible halo nature as well as the low-lying electric dipole (1) response within a three-body approach. We use an analytical, transformed harmonic oscillator basis under the aegis of a hyperspherical formalism to construct the ground state three-body wave function of F. The F ground-state configuration mixing and its matter radius are computed for different choices of the F structure coupled to the valence neutron. The admixture of {, , and } components is found to play an important role, favouring the dominance of inverted configurations with dineutron spreads for two-neutron halo formation. The increase in matter radius with respect to the core radius, 0.30 fm and the dipole distributions along with the integrated strengths of 2.6 fm are large enough to be compatible with other two-neutron halo nuclei. Three-body results for F indicate a large spatial extension in its ground state due to the inversion of the energy levels of the normal shell model scheme. The increase is augmented by and is proportional to the extent of the component in the wave function. Additionally, the enhanced dipole distributions and large strengths all point to the two-neutron halo character of F.

    Comments:
    15 pages with 20 figures and two tables
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2109.04851 [pdf]
    PRC(2022)·20 citations
  2. 02

    [Submitted on 10 Sept 2021]

    Left-right splitting of elliptic flow due to directed flow in heavy ion collisions

    Chao Zhang🇺🇸 · Zi-Wei Lin🇺🇸

    Recently the splitting of elliptic flow at finite rapidities has been proposed as a result of the global vorticity in non-central relativistic heavy ion collisions. In this study, we find that this left-right (i.e., on opposite sides of the impact parameter axis) splitting of the elliptic flow at finite rapidities is a result of the non-zero directed flow , with the splitting magnitude . We also use a multi-phase transport model, which automatically includes the vorticity field and flow fluctuations, to confirm the splitting. In addition, we find that the analytical expectations for the splitting work for the raw and (i.e., before event plane resolutions are applied) measured relative to either the first- or second-order event plane. Since the splitting is mostly driven by , it vanishes at zero transverse momentum (), and its magnitude and sign may have non-trivial dependencies on , centrality, collision energy, and hadron species.

    Comments:
    8 pages, 10 figures; v2 splitting results are now shown to 2nd order, added a new section with six figures to show results from the event plane method
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2109.04987 [pdf]
    PRC(2022)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE