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Pioneering Experiment for High Resolution Decay Pion Spectroscopy of Light Hypernuclei at MAMI

At the Mainz Microtron hypernuclei are produced by (e, e'K) reactions. A dedicated kaon spectrometer located at 0^o with respect to the electron beam is used to detect kaons emitted in forward direction thus tagging events involving strangeness production. Excited hypernuclei created in the primary reaction are likely to fragment creating a variety of different light hyperfragments. A large fraction of the hyperfragments is stopped inside the target and deexcites electromagnetically before the decay. Mesonic two body weak decay of these hyperfragments results in mono energetic pions. By measuring the momenta of these pions using high resolution magnetic spectrometers one gains direct access to the ground state masses of the produced hyperfragments. A ground state mass determination with a precision of better than 20 keV/c^2 is expected.

Hypernuclear spectroscopy; Kaon; Kaos spectrometer

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