Phys. Rev. Lett. 77, 2893–2896 (1996)First Observation of the Tz = -7/2 Nuclei 45Fe and 49NiReceived 25 July 1996; published in the issue dated 30 September 1996 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 fragmention on a beryllium target. The fragments were separated by a projectile-fragement separator and unambiguously identified. We report here 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 nonobservation of 38Ti (Tz = -3) in this experiment, an upper limit of 120 ns is deduced for the half-life of this isotope. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.2893
DOI:
10.1103/PhysRevLett.77.2893
PACS:
25.70.Mn, 21.10.Dr, 23.50.+z, 27.40.+z
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