Core-Excitations in the Ground States of the Neutron-Rich Fluorine Isotopes.

ORAL

Abstract

The breakdown of classical shell structure and the appearance of new magic numbers in nuclei with extreme N/Z ratios provide a valuable testing ground for shell-model and ab-initio descriptions.
In particular, there is substantial evidence for the appearance of N=16 as a new magic number in the oxygen isotopes as one approaches the dripline. Ab-initio methods including both NN and 3N interactions have been successful in describing the dripline at $^{24}$O, and have recently been extended into the Fluorine isotopes. They predict a fragmentation of the $\pi$1d5/2 strength as one moves towards stability due to core-coupling.

A recent experiment designed to study the evolution of core excitations in the ground states of the neutron-rich Fluorine isotopes was performed at the NSCL with GRETINA and the S800.
Using proton-knockout reactions from $^{21-25}$F secondary beams at 80-100 MeV/u, a consistent set of exclusive cross sections, momentum distributions, and derived spectroscopic factors can be obtained -- providing a stringent test of recent shell-model and ab-initio approaches.

 

 

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Presenters

  • Michael David Jones

    Univ of NC - Chapel Hill

Authors

  • Michael David Jones

    Univ of NC - Chapel Hill

  • Heather Crawford

    Nuclear Science Division, Lawrence Berkeley National Laboratory, Lawrence Berkeley Natl Lab, Lawrence Berkeley Natl Lab, Argonne Natl Lab, Los Alamos Natl Lab, University of Connecticut, iThemba LABS, University of Maryland, Lawrence Berkeley National Laboratory

  • Christopher M Campbell

    Lawrence Berkeley Natl Lab

  • Roderick M Clark

    Lawrence Berkeley Natl Lab

  • Paul Fallon

    Lawrence Berkeley Natl Lab

  • Mario Cromaz

    Lawrence Berkeley Natl Lab

  • I-Yang Lee

    Lawrence Berkeley Natl Lab

  • Augusto O Macchiavelli

    Lawrence Berkeley Natl Lab

  • Marco Salathe

    Nuclear Science Division, Lawrence Berkeley National Laboratory, Lawrence Berkeley Natl Lab

  • Daniel Bazin

    National Superconducting Cyclotron Laboratory, Michigan State University, Michigan State Univ, National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA, Michigan State University

  • Alexandra Gade

    National Superconducting Cyclotron Laboratory, Michigan State University, Michigan State Univ, Michigan State University

  • Dirk W W Weisshaar

    Michigan State Univ, National Superconducting Cyclotron Laboratory, Michigan State University

  • Peter C C Bender

    Univ of Mass - Lowell, Michigan State Univ, UMass Lowell

  • Jason D Holt

    TRIUMF

  • Jeff Tostevin

    University of Surrey

  • Robert V F Janssens

    Univ of NC - Chapel Hill