High Resolution Spectroscopy of 12B_Lambda by Electroproduction

TL;DR

This paper reports high-resolution electroproduction measurements of hypernuclei in 12B, achieving unprecedented energy resolution and revealing detailed spectral features between core-excited states.

Contribution

It introduces advanced detection equipment and techniques that significantly improve energy resolution in hypernuclear spectroscopy.

Findings

Achieved energy resolution below 700 keV FWHM.

First identification of strength in the core-excited region of 12B.

Enhanced kaon detection capabilities with new superconducting magnets and RICH detector.

Abstract

An experiment measuring electroproduction of hypernuclei has been performed in Hall A at Jefferson Lab on a $^{12}$C target. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A standard equipment. An unprecedented energy resolution of less than 700 keV FWHM has been achieved. Thus, the observed \lam{12}{B} spectrum shows for the first time identifiable strength in the core-excited region between the ground-state {\it s}-wave $\Lambda$ peak and the 11 MeV {\it p}-wave $\Lambda$ peak.