Abstract
We report the first observation of the doubly-magic nucleus100Sn. This isotope was produced by nuclear fragmentation of124Xe 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.
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The authors thank K.-H. Behr, A. Brünle, K. Burkard, W. Czech, H. Falkner, M. Klöckner, R. Lang, E. Pfeng, and S. Winkler for technical support. We gratefully acknowledge the contributions of all our colleagues at the FRS to the excellent performance of the separator. We are indebted to the GSI accelerator staff for providing intense and stable beams of124Xe and to the GSI target laboratory for preparing high-quality targets and degraders. This work has been partially funded by the German Federal Minister for Research and Technology (BMFT) under contract number 06TM353 TP1.