Abstract
Electron-induced proton, neutron and deuteron knock-out remains the most versatile probe of the electro-magnetic properties and spin structure of light nuclei. The advent of highly polarized beams and targets and improvements in recoil polarization methods, as well as analysis and simulation techniques, have enabled us to study the static and dynamical properties of few-body systems with unprecedented precision. Recent experiments at Jefferson Lab and MAMI are presented and put into perspective of state-of-the art Faddeev calculations, with focus on the ^\mathbf{3}\mathbf{He}3𝐇𝐞 nucleus.
Highlights
All modern electron-scattering experiments involving polarization degrees of freedom are being performed either at the Thomas Jefferson National Accelerator Facility (TJNAF or JLab) in Newport News, USA, or at the MAMI Accelerator Facility in Mainz, Germany
In this paper we present the results of a select list of the most relevant recent experiments: TJNAF E05–102, dedicated to the measurement of double-spin asymmetries in the 3He(e, e d)p, 3He(e, e p)d and 3He(e, e p)pn processes in the quasi-elastic region; the TJNAF E05–015, whose main goal was the determination of target single-spin asymmetry in the quasi-elastic 3He↑(e, e ) process; the TJNAF E08–005 in which we studied target single-spin asymmetries in quasi-elastic 3He↑(e, e n) and double-spin asymmetries in quasi-elastic 3He(e, e n); and the MAMI Project ‘N’ with the first-ever attempt to investigate the triple-polarized process 3He(e, e p) in order to study the spin-dependent distribution of polarized pd clusters in 3He
A precise knowledge of ground-state structure of 3He is needed to extract the information on the neutron from all types of exclusive or inclusive experiments on polarized 3He, for instance, measurements of GEn, GMn, An1, g1n, g2n or determinations of the GDH sum rule
Summary
All modern electron-scattering experiments involving polarization degrees of freedom are being performed either at the Thomas Jefferson National Accelerator Facility (TJNAF or JLab) in Newport News, USA, or at the MAMI Accelerator Facility in Mainz, Germany. The 3He nucleus is the playground for tests of few-body nuclear dynamics [1, 2], but lately 2H and 12C have received renewed attention due to their relevance for the study of medium modifications of elastic form-factors of nucleons; here we outline our efforts to determine the single-spin asymmetries in 12C(e↑, e ) as well as recoil polarizations in 2H(e, e p) and 12C(e, e p) processes
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