Study of Hypernuclei with Intense Electron-Photon Beams

In this letter, we propose to investigate Λ hypernuclei for the A 15 mass region by using pionic decay. The Project aims to determine precisely the binding energies of light hypernuclei, investigate production of exotic hypernuclei, and study impurity nuclear physics and the medium effect of baryons. ≤ These investigations will fully utilize the unique parameters (high intensity, small emittance and fine beam bunch time structure) of the CW electron beams at Jefferson Laboratory, and are enabled by (1) the use of high-resolution kaon spectrometer (HKS) in Hall C, (2) the development of a high-resolution magnetic spectrometer for hypernuclear decayed pions ( ), (3) the development of a Cherenkov picosecond timing technique based on the recently proposed RF picosecond phototubes. S Hπ Light hypernuclei ground state binding energy measurements must have a precision about 100 keV. Their average values will be determined with a precision better than 10 keV. We propose to start with HKS and with a conventional timing technique and carry out a pilot experiment by using , and targets and simultaneously develop the RF Cherenkov picosecond timing technique for the next step hypernuclear studies at Jefferson Laboratory. S Hπ C 12 Li 7 He 4