Production cross sections for neutron-rich nuclei from the fragmentation of a 82Se beam at 139 MeV/u were measured. The longitudinal momentum distributions of 122 neutron-rich isotopes of elements 11≤Z≤32 were determined by 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 22≤Z≤25 (64Ti, 67V, 69Cr, 72Mn). One event was registered consistent with 70Cr, and another one with 75Fe. A one-body Qg systematics is used to describe the production cross sections based on thermal evaporation from excited prefragments. The current results confirm those of our previous experiment with a 76Ge beam: enhanced production cross sections for neutron-rich fragments near Z=20.
@article{arxiv.1209.1357,
title = {Production cross sections of neutron rich isotopes from a 82Se beam},
author = {O. B. Tarasov and D. J. Morrissey and A. M. Amthor and L. Bandura and T. Baumann and D. Bazin and J. S. Berryman and G. Chubarian and N. Fukuda and A. Gade and T. N. Ginter and M. Hausmann and N. Inabe and T. Kubo and J. Pereira and M. Portillo and B. M. Sherrill and A. Stolz and C. Sumithrarachchi and M. Thoennessen and D. Weisshaar},
journal= {arXiv preprint arXiv:1209.1357},
year = {2015}
}
Comments
Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)