E0Transitions from02+→01+States in theZ=82Region

Energy spectra of internal-conversion electrons following ($p, 2n$) reactions leading to even-even final nuclei in the $Z\simeq 82$ region were measured. $E0\mathrm{}$ transitions leading from the $0^{+}$ member of the two-phonon triplet to the $0^{+}$ ground state were found, and the systematics of their transition rates was studied. They compete poorly with $E2\mathrm{}$ transitions to the first excited ($2^{+}$) state, and the $E0\mathrm{}$ transition rapidly becomes relatively less probable with decreasing $A$ in this region.