FIRST OBSERVATION OF NEW NEUTRON‐RICH MAGNESIUM, ALUMINUM, AND SILICON ISOTOPES
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The investigation of the limits of nuclear existence is fundamental to the understanding of nuclear forces and structure. The limits of binding for very neutron-rich nuclei and the location of the neutron dripline are established experimentally only for the lightest elements. We report on the discovery of the new neutron-rich isotopes 40Mg, 42,43Al, and 44Si. These rare isotopes were produced at the National Superconducting Cyclotron Laboratory by fragmentation of a 141 MeV/u 48Ca beam on a tungsten target. The combination of the A1900 fragment separator together with the analysis beam line of the S800 spectrograph provided a two-stage fragment separation with exceptional selectivity. The observation of the odd-odd nucleus 42Al, which was predicted to be unbound by FRDM  and HFB-8  models, is the first indication that the neutron drip line may be located significantly further towards heavier isotopes in this mass region than it is currently believed. © 2010 American Institute of Physics.
author list (cited authors)
Stolz, A., Amthor, A. M., Baumann, T., Bazin, D., Brown, B. A., Folden Iii, C. M., ... Oluseyi, H. M.