Hypernuclear -rays

A systematic study of the -ray spectra for hypernuclei produced in the (K) and (,K) reactions is suggested. The experiment would use a germanium-ball detector and a spectrometer like the Moby-Dick spectrometer now situated in the C6 line.

The (K) strangeness exchange reactions as well as the (,K) associated production reaction will populate various levels of hypernuclei including spin-flip states. The observation of gamma rays with 2 keV resolution, which is three orders of magnitude better than the conventional magnetic spectrometer, will enable us to obtain detailed information on the hypernuclear structure as well as the hyperon-nucleon interactions, in particular, spin-dependent ones. The Ge-ball comprising 14 Ge-detectors with 50% efficiency plus anti-Compton suppressors will be completed in 1997-8.