Experiments with compton back scattered gamma beams (on GRAAL collaboration results)

Journal Article · Tue May 15 04:00:00 EDT 2012 · Physics of Particles and Nuclei

DOI:https://doi.org/10.1134/S1063779612030057· OSTI ID:22975083

Nedorezov, V. G. ^[1]

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1. Institute for Nuclear Research, RAS, Moscow (Russian Federation)

Experimental study of photonuclear reactions using Compton back scattered gamma beams at intermediate energies (from pion photoproduction threshold up to a few GeV) is reviewed. The last review of this subject was published about 10 years ago. Since then, new fundamental data on nucleon spin structure and photonuclear excitation mechanisms have appeared in the literature. Principal attention in the present review is paid to the GRAAL (Grenoble Accelerateur Anneau Laser) experiment conducted at ESRF (European Synchrotron Radiation Facility). It is shown that, in addition to the principal polarization experimental program based on high degree of gamma beam polarization, new results on different applications have been obtained. For example, total photoabsorption and partial meson photoproduction cross sections were measured with high accuracy, and a new method for studying an interaction of unstable short-lived mesons with nuclear media (tagged mesons) was proposed. New results on anisotropy of the speed of light with respect to the dipole of cosmic microwave background radiation were evaluated. It is noted that new opportunities arise due to unique conditions appearing while conducting the experiments with the Compton back scattering technique, which provides the hard photon spectrum, high degree of beam polarization, and low backgrounds.

• OSTI ID: 22975083
• Journal Information: Physics of Particles and Nuclei, Journal Name: Physics of Particles and Nuclei Journal Issue: 3 Vol. 43; ISSN 1063-7796
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BACKGROUND RADIATION
BACKSCATTERING
BEAMS
EUROPEAN SYNCHROTRON RADIATION FACILITY
MICROWAVE RADIATION
PHOTONS
PHOTOPRODUCTION
PIONS
POLARIZATION
REVIEWS
TOTAL CROSS SECTIONS