Proton Compton Scattering from Linearly Polarized Gamma Rays

• DOI: 10.1103/physrevlett.128.132502
• Publication Date: 2022-04-01T15:41:42Z
• Authors: X. Li; M. W. Ahmed; A. Banu; C. Bartram; B. Crowe; E. J. Downie; M. Emamian; G. Feldman; H. Gao; D. Godagama; H. W. Grießhammer; C. R. Howell; H. J. Karwowski; D. P. Kendellen; M. A. Kovash; K. K. H. Leung; D. M. Markoff; J. A. McGovern; S. Mikhailov; R. E. Pywell; M. H. Sikora; J. A. Silano; R. S. Sosa; M. C. Spraker; G. Swift; P. Wallace; H. R. Weller; C. S. Whisnant; Y. K. Wu; Z. W. Zhao
• Keywords: 0103 physical sciences; FOS: Physical sciences; Nuclear Experiment (nucl-ex); Nuclear Experiment; 01 natural sciences

Differential cross sections for Compton scattering from the proton have been measured at angles of 55°, 90°, and 125° in laboratory frame using quasimonoenergetic linearly (circularly) polarized photon beams with a weighted mean energy value 83.4 MeV (81.3 MeV). These measurements were performed High Intensity Gamma-Ray Source facility Triangle Universities Nuclear Laboratory. The results are compared to previous interpreted chiral effective field theory framework extract electromagnetic dipole polarizabilities proton, which gives α_{E1}^{p}=13.8±1.2_{stat}±0.1_{BSR}±0.3_{theo},β_{M1}^{p}=0.2∓1.2_{stat}±0.1_{BSR}∓0.3_{theo} units 10^{-4} fm^{3}.