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First observation of the 13Li ground state

Z. Kohley1,*, E. Lunderberg2, P. A. DeYoung2, A. Volya3, T. Baumann1, D. Bazin1, G. Christian1,4,†, N. L. Cooper5, N. Frank6 et al.

A. Gade1,4, C. Hall2, J. Hinnefeld5, B. Luther7, S. Mosby1,4,‡, W. A. Peters1,4,§, J. K. Smith1,4, J. Snyder1,4, A. Spyrou1,4, and M. Thoennessen1,4

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics, Hope College, Holland, Michigan 49422, USA
  • 3Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
  • 4Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 5Department of Physics and Astronomy, Indiana University at South Bend, South Bend, Indiana 46634, USA
  • 6Department of Physics and Astronomy, Augustana College, Rock Island, Illinois 61201, USA
  • 7Department of Physics, Concordia College, Moorhead, Minnesota 56562, USA

  • *kohley@nscl.msu.edu
  • †Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  • ‡Present address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • §Present Address: Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830, USA.
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Phys. Rev. C 87, 011304(R) – Published 31 January, 2013

DOI: https://doi.org/10.1103/PhysRevC.87.011304

Abstract

The ground state of neutron-rich unbound 13Li was observed for the first time in a one-proton removal reaction from 14Be at a beam energy of 53.6 MeV/u. The 13Li ground state was reconstructed from 11Li and two neutrons giving a resonance energy of 120−80+60 keV. All events involving single- and double-neutron interactions in the Modular Neutron Array (MoNA) were analyzed, simulated, and fitted self-consistently. The three-body (11Li+n+n) correlations within Jacobi coordinates showed strong dineutron characteristics. The decay energy spectrum of the intermediate 12Li system (11Li+n) was described with an s-wave scattering length of greater than −4 fm, which is a smaller absolute value than reported in a previous measurement.

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Phys. Rev. C 87, 011304(R)– Published 31 January, 2013
  • Received 15 November 2012
Article part of CHORUS

©2013 American Physical Society

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