The characteristics of the Jefferson Lab electron beam, together with those of the experimental equipment, offer a unique opportunity to study hypernuclear spectroscopy via electromagnetic induced reactions. Experiment 94-107 started a systematic study on 1p-shell targets, $^{ 12}C$, $^{ 9}Be$ and $^{ 16}O$. For $^{ 12}C$ for the first time measurable strength in the core-excited part of the spectrum between the ground state and the p state was shown in $^{ 12}_{ \Lambda}B$ spectrum. A high-quality $^{ 16}_{ \Lambda}N$ spectrum was produced for the first time with sub-MeV energy resolution. A very precise $\Lambda$ binding energy value for $^{ 16}_{ \Lambda}N$, calibrated against the elementary $(e,e'K^+)$ reaction on hydrogen, has also been obtained. $^{ 9}_{ \Lambda}Li$ spectrum shows some disagreement in strength for the second and third doublet with respect to the theory.
Categories: nucl-ex