New isotopeSi44and systematics of the production cross sections of the most neutron-rich nuclei

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Abstract
The results of measurements of the production of neutron-rich nuclei by the fragmentation of a Ca48 beam at 142 MeV/nucleon are presented. Evidence was found for the production of a new isotope that is the most neutron-rich silicon nuclide, Si44, in a net neutron pickup process. A simple systematic framework was found to describe the production cross sections based on thermal evaporation from excited prefragments that allows extrapolation to other weak reaction products.

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