New (e, e'K+) hypernuclear spectroscopy with a high-resolution kaon spectrometer (HKS)

Reaction spectroscopy of Λ hypernuclei by the (e, e'K+) reaction with unprecedented quality is under preparation, following the success of Jlab E89-009 experiment, which observed a sub-MeV Λ12B spectrum in the 12C(e, e'K+)Λ12B reaction. The experiment, Jlab E01-011, utilizes the 'tilt method', in which the scattered electron spectrometer is vertically tilted so that 0-degree bremsstrahlung electrons do not enter the spectrometer system. Together with a high-resolution kaon spectrometer (HKS) under construction, reaction spectroscopy of Λ hypernuclei with more than 50 times efficient and twice better resolution (3-400 keV (FWHM)) becomes possible. Hypernuclear spectroscopy by the (e, e'K+) reaction will be extended to the mass region beyond the p-shell region. (author)