The nuclear decay chains beginning with the neutron-deficient isotopes ${}_{}{}^{184}{}_{}{}^{}\mathrm{Hg}$, ${}_{}{}^{186}{}_{}{}^{}\mathrm{Hg}$, and ${}_{}{}^{188}{}_{}{}^{}\mathrm{Hg}$ have been studied using isotopically separated sources from the Princeton on-line isotope-separator facility. Ge(Li) and Si(Li) singles spectra and Ge(Li)-Ge(Li) coincidence spectra have been obtained and used in constructing level schemes for the corresponding platinum daughters. Systematics of experimental energy levels and ratios $\frac{B(E2,2^{\prime }\to 2)}{B(E2,2^{\prime }\to 0)}$ for all known even platinum isotopes are given.

• Received 27 August 1970

DOI:https://doi.org/10.1103/PhysRevC.3.756