Measurement of the electric and magnetic polarizabilities of the proton

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.2097· OSTI ID:118506

MacGibbon, B E; Garino, G; Lucas, M A; Nathan, A M ^[1]; Feldman, G ^[2]; Dolbilkin, B ^[3]

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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)

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, Journal Name: Physical Review, C Journal Issue: 4 Vol. 52; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COMPTON EFFECT
CROSS SECTIONS
DISPERSION RELATIONS
MEV RANGE 10-100
PHOTONS
POLARIZABILITY
PROTONS