Observation of Levels inCΛ13,NΛ14, andOΛ18Hypernuclei

The spectra of levels in the hypernuclei ${}_{\Lambda }{}^{13}{}_{}{}^{}\mathrm{C}$, ${}_{\Lambda }{}^{14}{}_{}{}^{}\mathrm{N}$, and ${}_{\Lambda }{}^{18}{}_{}{}^{}\mathrm{O}$, excited by 800-MeV/c kaons in the ($K^{-}$,${\pi }^{-}$) reaction, have been observed at the Brookhaven alternating-gradient synchrotron. Data were recorded for scattering angles from 0° to 25°, corresponding to momentum transfers from 50 to 330 MeV/c. The levels are interpreted in terms of a $\Lambda$ hyperon coupled to a strangeness-zero nuclear core. The results provide insights into the properties of the $\Lambda$-nucleon and $\Lambda$-nucleus interactions.