Measurement of spin polarizabilities of the proton

Spin polarizabilities are as-yet experimentally unknown fundamental structure constants that describe the response of the nucleon spin to the action of a changing electromagnetic field. The A2 Collaboration at the Institute for Nuclear Physics in Mainz (Institut für Kernphysik, Mainz) performed the...

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Bibliographic Details
Published in:Physics of atomic nuclei 2014, Vol.77 (1), p.110-116
Main Author: Gurevich, G. M.
Format: Article
Language:English
Subjects:
Analysis
Electromagnetism
Elementary Particles and Fields
Measurement
Nuclear physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
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Summary:Spin polarizabilities are as-yet experimentally unknown fundamental structure constants that describe the response of the nucleon spin to the action of a changing electromagnetic field. The A2 Collaboration at the Institute for Nuclear Physics in Mainz (Institut für Kernphysik, Mainz) performed the first measurements of the energy and angular dependences of spin asymmetries of the cross section for doubly polarized (polarized-photon beam incident to a polarized proton target) Compton effect in the Δ-resonance region, these asymmetries being sensitive to values of the spin polarizabilities. The preparation of spin-asymmetry measurements at energies below the pion-production threshold with an active (scintillating) polarized target is in progress. These measurements will make it possible to determine individual spin polarizabilities of the proton in a model-independent way.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778813120089