The first measurement of the helicity dependence of the total inclusive 3 He photo-absorption cross section and of the partial cross sections for several reaction channels was carried out at MAMI (Mainz) in the photon energy range between 150 and 500 MeV. The experiment used the large acceptance Crystal Ball spectrometer, complemented by charged particle and vertex detectors, a circularly polarised tagged photon beam and a longitudinally polarised high-pressure 3 He gas target. The results obtained give information on the GDH integral on 3 He and on the neutron and allow an investigation of the modifications of nucleon properties inside 3 He.
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 10 Jun 2013|
- Nucleon spin structure
- Polarisation observables
ASJC Scopus subject areas
- Nuclear and High Energy Physics