Göttingen 1997 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 13: Kernspektroskopie, leichte Kerne I
HK 13.7: Vortrag
Montag, 24. März 1997, 18:45–19:00, HS E
The first observation of the Tz=−7/2 nuclei 45Fe and 49Ni — •M. Hellström2, B. Blank1, S. Czajkowski1, F. Davi1, R. Del Moral1, J. P. Dufour1, A. Fleury1, C. Marchand1, M. S. Pravikoff1, J. Benlliure2, F. Boué2, R. Collatz2, A. Heinz2, Z. Hu2, E. Roeckl2, M. Shibata2, K. Sümmerer2, Z. Janas3, M. Karny3, M. Pfützner3, and M. Lewitowicz4 — 1Centre d’Etudes Nucléaires de Bordeaux-Gradignan, France — 2Gesellschaft für Schwerionenforschung, Darmstadt, Germany — 3Institute of Experimental Physics, University of Warsaw, Poland — 4Grand Accélerateur National des Ions Lourds, Caen, France
A primary beam of 58Ni at 600 MeV/nucleon from the SIS synchrotron at GSI was used to produce proton-rich isotopes in the titanium-to-nickel region by projectile fragmentation on a beryllium target. The fragments were separated by the projectile-fragment separator FRS and unambiguously identified by means of a TOF-ΔE-Bρ analysis. We report the first observation of the Tz=−7/2 nuclei 45Fe and 49Ni, the most proton-rich nuclei ever synthesized, with an excess of seven protons. In addition, the new isotope 42Cr (Tz=−3) was identified. According to commonly used mass predictions, these isotopes are all unbound with respect to two-proton emission from their ground states. From the non-observation of 38Ti (Tz=−3) in this experiment, an upper limit of 120 ns is deduced for the half-life of this isotope.