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Production cross sections for neutron-rich nuclei from the fragmentation of a82Se beam at 139 MeV/u were measured. The longitudinal momentum distributionsof 122 neutron-rich isotopes of elements $11 \le Z \le 32$ were determined byvarying the target thickness. Production cross sections with beryllium andtungsten targets were determined for a large number of nuclei including severalisotopes first observed in this work. These are the most neutron-rich nuclidesof the elements $22 \le Z \le 25$ (64Ti, 67V, 69Cr, 72Mn). One event wasregistered consistent with 70Cr, and another one with 75Fe. A one-body Qgsystematics is used to describe the production cross sections based on thermalevaporation from excited prefragments. The current results confirm those of ourprevious experiment with a 76Ge beam: enhanced production cross sections forneutron-rich fragments near Z=20.

Production cross sections of neutron rich isotopes from a 82Se beam