The N = Z nuclide 74Rb with T,Iπ = 1, 0+

Improved experimental techniques have permitted the observation of the new nuclide ⁷⁴Rb with a half-life of 64.9 ± 0.5 ms, which represents the heaviest self-conjugate nucleus detected until now. The absenceof along-lived isomer indicates that the T = 0 state of ⁷⁴Rb lies a bove the T = 1 state. An upper limit of 10^?3 relative top ⁷⁴Rb can be placed on the yield of the (unobserved) mirror nucleus ⁷³Rb, and it appears likely that the limit of particle stability has been reached. The half-life of ⁷⁵Rb is 17.0 ± 1.0 s.