Singular observation of shape and spin hindrance in metastable nuclear decay of ${}^{197}$Au

S. K. Tandel, D. Rathore, M. Hemalatha +8

A $I^{\pi }$ = (29/2${}^{+}$) metastable state with $T_{1/2}$ $>$ 10 s at $E_x$ = 2102 keV has been identified in the stable nucleus, ${}^{197}$Au. Its decay exhibits the unusual coexis…