A. Margaryan

Observation of H Λ 4 Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering

At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy from decays of strange systems was performed by electron scattering off a (9)Be target in order to study the Λ binding energy of light hypernuclei. Positively charged kaons were detected by a short-orbit spectrometer with a broad momentum acceptance at 0° forward angles with respect to the beam, efficiently tagging the production of strangeness in the target nucleus. Coincidentally, negatively charged decay pions were detected by two independent high-resolution spectrometers. About 10(3) pionic weak decays of hyperfragments and hyperons were observed. The pion momentum distribution shows a monochromatic peak at pπ≈133  MeV/c, corresponding to the unique signature for the two-body decay of hyperhydrogen Λ(4)H→(4)He+π(-), stopped inside the target. Its Λ binding energy was determined to be BΛ=2.12±0.01  (stat)±0.09  (syst)MeV with respect to the (3)H+Λ mass.

High resolution spectroscopic study of Be Λ10

Spectroscopy of a

High resolution spectroscopic study of

^{10}_{\Lambda}

^{10}_{\Lambda}

Be hypernucleus was carried out at JLab Hall C using the

Be

(e,e^{\prime}K^{+})

Tagged-weak π method

reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, was used to obtain an energy spectrum with a resolution of 0.78 MeV (FWHM). The well-calibrated spectrometer system of the present experiment using the

Kaon, pion, and proton associated photofission of Bi nuclei

p(e,e^{\prime}K^{+})\Lambda,\Sigma^{0}

HYPERNUCLEAR SPECTROSCOPY WITH ELECTRON BEAM AT JLab HALL C

reactions allowed us to determine the energy levels, and the binding energy of the ground state peak (mixture of 1

First Experiment on Spectroscopy of Lambda-Hypernuclei by Electroproduction at Jlab

^{-}

High-Resolution Decay-Pion Spectroscopy of

and 2