PRODUCTION, IDENTIFICATION, AND HALFLIFE MEASUREMENT OF SN-100

We report the first observation of the doubly-magic nucleus Sn-100. Th e isotope was produced by nuclear fragmentation of Xe-124 projectiles at 1095 A . MeV using the heavy-ion synchrotron SIS at GSI Darmstadt. The projectile fragments were separated in flight with the projectile- fragment separator FRS and identified by measuring event by event the magnetic rigidity, the time of flight and the energy deposition. After identification the ions were implanted into a silicon detector stack and the decay was studied. We report preliminary results of the halfli fe determination.