Phys. Rev. Lett. 84, 1116–1119 (2000)Discovery of Doubly Magic 48Ni
In an experiment at the SISSI/LISE3 facility of GANIL, we used the projectile fragmentation of a primary 58Ni26+ beam at 74.5 MeV/nucleon with an average current of 3μA on a natural nickel target to produce very neutron-deficient isotopes. In a 10-day experiment, 287 42Cr isotopes, 53 45Fe isotopes, 106 49Ni isotopes, and 4 48Ni isotopes were unambiguously identified. The doubly magic nucleus 48Ni, observed for the first time, is the most proton-rich isotope ever identified with an isospin projection Tz = -4. It is probably the last doubly magic nucleus with “classical” shell closures accessible for present-day facilities. Its observation allows us to deduce a lower limit for the half-life of 48Ni of 0.5μs. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.1116
DOI:
10.1103/PhysRevLett.84.1116
PACS:
27.40.+z, 21.10.Dr, 23.50.+z, 25.70.Mn
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