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At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy fromdecays of strange systems was performed by electron scattering off a Be-9target in order to study the ground-state masses of Lambda-hypernuclei.Positively charged kaons were detected by a short-orbit spectrometer with abroad momentum acceptance at zero degree forward angles with respect to thebeam, efficiently tagging the production of strangeness in the target nucleus.In coincidence, negatively charged decay-pions were detected by two independenthigh-resolution spectrometers. About 10^3 pionic weak decays of hyperfragmentsand hyperons were observed. The pion momentum distribution shows amonochromatic peak at p_pi ~ 133 MeV/c, corresponding to the unique signaturefor the two-body decay of hyperhydrogen Lambda H-4 -> He-4 + pi-, stoppedinside the target. Its binding energy was determined to be B_Lambda = 2.12 +-0.01 (stat.) +- 0.09 (syst.) MeV with respect to the H-3 + Lambda mass.

Observation of Lambda H-4 hyperhydrogen by decay-pion spectroscopy in electron scattering