Abstract
The study of the stability of an astrophysically interesting nucleus 73Rb was performed by searching its β+ and proton decay at the ISOLDE facility at CERN. Light rubidium isotopes were produced in a spallation reaction of a niobium target induced by a pulsed 1 GeV proton beam. The previously reported proton-unbound character of 73Rb was confirmed and the upper limit for its production cross-section was reduced by more than one order of magnitude.
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