New nucleusXe142: Test of theNpNnscheme

Abstract
Excited states in the neutron-rich nucleus Xe142 have been determined by observing prompt γ rays in fragments from Cm248 spontaneous fission. Estimates of the lowest excited-state energies in Xe142 based on normal systematics differ considerably from those derived from the Np Nn scheme. Experimental values are in good agreement with the Np Nn scheme and illustrate its predictive power in this mass region.