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.
@article{arxiv.1301.4410,
title = {First observation of $^{13}$Li ground state},
author = {Z. Kohley and E. Lunderberg and P. A. DeYoung and A. Volya and T. Baumann and D. Bazin and G. Christian and N. L. Cooper and N. Frank and A. Gade and C. Hall and J. Hinnefeld and B. Luther and S. Mosby and W. A. Peters and J. K. Smith and J. Snyder and A. Spyrou and M. Thoennessen},
journal= {arXiv preprint arXiv:1301.4410},
year = {2015}
}
Comments
Accepted for publication in Phys. Rev. C as a Rapid Communication