FIRST EXPERIMENT TO PRODUCE Λ-HYPERNUCLEI USING ELECTRON BEAM AT JLAB

Abstract

The first experiment producing Λ-hypernuclear spectroscopy using the high-precision electron beam has been carried out at Jefferson Laboratory (JLab). A zero degree tagging technique for the scattered electrons was applied and the hypernuclear spectrometer system (HNSS) was successfully used to measure spectra from the (e, e′ K+) reaction. The best energy resolution obtained thus far in hypernuclear spectroscopy with magnetic spectrometers, near or below 1 MeV, was achieved. This paper describes the general technique of HNSS and the preliminary results for the [Formula: see text] and [Formula: see text] systems. A new phase of experiment on hypernuclear spectroscopy is approved for the future with much higher yield and quality and even better energy resolution.