Abstract
In an experiment at the SISSI/LISE3 facility of GANIL, we used the projectile fragmentation of a primary beam at 74.5 MeV/nucleon with an average current of on a natural nickel target to produce very neutron-deficient isotopes. In a 10-day experiment, 287 isotopes, 53 isotopes, 106 isotopes, and 4 isotopes were unambiguously identified. The doubly magic nucleus , observed for the first time, is the most proton-rich isotope ever identified with an isospin projection . It is probably the last doubly magic nucleus with “classical” shell closures accessible for present-day facilities. Its observation allows us to deduce a lower limit for the half-life of of .
- Received 20 October 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.1116
©2000 American Physical Society