Measurement of the electric and magnetic polarizabilities of the proton
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
- Saskatchewan Accelerator Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0 (Canada)
- Institute for Nuclear Research, Russian Academy of Sciences, Moscow 117312 (Russian Federation)
The Compton scattering cross section on the proton has been measured at laboratory angles of 90{degree} and 135{degree} using tagged photons in the energy range 70--100 MeV and simultaneously using untagged photons in the range 100--148 MeV. With the aid of dispersion relations, these cross sections were used to extract the electric and magnetic polarizabilities, {bar {alpha}} and {bar {beta}} respectively, of the proton. We find {bar {alpha}}+{bar {beta}}=(15.0 {plus_minus}2.9{plus_minus}1.1{plus_minus}0.4){times}10{sup {minus}4} fm{sup 3}, in agreement with a model-independent dispersion sum rule, and {bar {alpha}} {minus}{bar {beta}} =(10.8{plus_minus}1.1{plus_minus}1.4{plus_minus}1.0){times}10{sup {minus}4} fm{sup 3}, where the errors shown are statistical, systematic, and model-dependent, respectively. A comparison with previous experiments is given and global values for the polarizabilities are extracted.
- OSTI ID:
- 118506
- Journal Information:
- Physical Review, C, Vol. 52, Issue 4; Other Information: PBD: Oct 1995
- Country of Publication:
- United States
- Language:
- English
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