First Observation of the {ital T}{sub {ital z}}{bold ={minus}7/2} Nuclei {sup 45}Fe and {sup 49}Ni
- Centre d`Etudes Nucleaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex (France)
- Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt (Germany)
- Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Hoza 69 (Poland)
- Grand Accelerateur National des Ions Lourds, B.P. 5027, F-14021 Caen Cedex (France)
A primary beam of {sup 58}Ni at 600MeV/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 {ital T}{sub {ital z}}={minus}7/2 nuclei {sup 45}Fe and {sup 49}Ni, the most proton-rich nuclei ever synthesized with an excess of seven protons. In addition, the new isotope {sup 42}Cr ({ital T}{sub {ital z}}={minus}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 {sup 38}Ti ({ital T}{sub {ital z}}={minus}3) in this experimet, an upper limit of 120ns is deduced for the half-life of this isotope. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 385771
- Journal Information:
- Physical Review Letters, Vol. 77, Issue 14; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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