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Title: Measurement of the electric and magnetic polarizabilities of the proton

Abstract

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.

Authors:
; ; ;  [1];  [2];  [3]
  1. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
  2. Saskatchewan Accelerator Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 0W0 (Canada)
  3. Institute for Nuclear Research, Russian Academy of Sciences, Moscow 117312 (Russian Federation)
Publication Date:
OSTI Identifier:
118506
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 52; Journal Issue: 4; Other Information: PBD: Oct 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; PROTONS; POLARIZABILITY; COMPTON EFFECT; CROSS SECTIONS; PHOTONS; MEV RANGE 10-100; DISPERSION RELATIONS

Citation Formats

MacGibbon, B.E., Garino, G., Lucas, M.A., Nathan, A.M., Feldman, G., and Dolbilkin, B. Measurement of the electric and magnetic polarizabilities of the proton. United States: N. p., 1995. Web. doi:10.1103/PhysRevC.52.2097.
MacGibbon, B.E., Garino, G., Lucas, M.A., Nathan, A.M., Feldman, G., & Dolbilkin, B. Measurement of the electric and magnetic polarizabilities of the proton. United States. doi:10.1103/PhysRevC.52.2097.
MacGibbon, B.E., Garino, G., Lucas, M.A., Nathan, A.M., Feldman, G., and Dolbilkin, B. Sun . "Measurement of the electric and magnetic polarizabilities of the proton". United States. doi:10.1103/PhysRevC.52.2097.
@article{osti_118506,
title = {Measurement of the electric and magnetic polarizabilities of the proton},
author = {MacGibbon, B.E. and Garino, G. and Lucas, M.A. and Nathan, A.M. and Feldman, G. and Dolbilkin, B.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.52.2097},
journal = {Physical Review, C},
number = 4,
volume = 52,
place = {United States},
year = {1995},
month = {10}
}