Ra223nuclear spectroscopy inC14cluster radioactivity

The energy spectrum of ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ ions emitted from ${}_{}{}^{223}{}_{}{}^{}\mathrm{Ra}$ sources implanted at ISOLDE has been measured with the spectrometer SOLENO. The highest statistics (899 events) and the best energy resolution (90 keV) obtained so far in cluster decay allow a real spectroscopic study. Hindrance factors for transitions to the ground state and first excited state in ${}_{}{}^{209}{}_{}{}^{}\mathrm{Pb}$, and limits for the next three low-lying states, hae been determined. The data can be explained by a parent wave function containing mainly a ${\mathit{i}}_{11/2}$ spherical component.