Abstract
Production cross sections for neutron-rich nuclei from the fragmentation of a Se beam at 139 MeV/u were measured. The longitudinal momentum distributions of 126 neutron-rich isotopes of elements were scanned using an experimental approach of varying the target thickness. Production cross sections with beryllium and tungsten targets were determined for a large number of nuclei including several isotopes first observed in this work. These are the most neutron-rich nuclides of the elements (Ti, V, Cr, and Mn). One event was registered consistent with Cr and another one with Fe. The production cross sections are correlated with systematics to reveal trends in the data. The results presented here confirm our previous results from a similar measurement using a Ge beam and can be explained with a shell model that predicts a subshell closure at around . This is demonstrated by systematic trends and calculations with the abrasion-ablation model that are sensitive to separation energies.
4 More- Received 11 February 2013
DOI:https://doi.org/10.1103/PhysRevC.87.054612
©2013 American Physical Society
Viewpoint
Pushing Back the Frontier of Stability
Published 20 May 2013
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