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.

 

 

*This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract no DE-AC02-05CH11231, DE-FG02- 97ER41041 (UNC), and DE-FG02-97ER41033 (TUNL).

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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