1976
DOI: 10.1007/bf01418136
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Proton Compton effect in the ?(1232) energy region

Abstract: The proton Compton effect 7 +P--+ 7 +P in the A (1232) energy region has been thoroughly studied. At the Bonn 500 MeV synchrotron differential cross sections were measured covering a large range of the CM scattering angle (50~ 130 ~ and an energy range from 240 to 440 MeV (LAB energy of the primary photon). A contribution to the counting rate from the competing process of rc ~ photoproduction was strongly suppressed by detecting both particles in the final state and by a proper choice of the endpoint energy of… Show more

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Cited by 42 publications
(20 citation statements)
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“…Our data gave results of 33 ±4 and 0.16 ±0.03 ^b/sr at an average incident laboratory photon energy of 313 MeV, compared to published measured values of 30 ±2 and 0.17 ±0.02 jub/sr for /r° and /, respectively. 4 ' 12 Our final cross sections are compared with the calcula- We conclude that our measurements of the coherent photon-scattering cross section for 4 He at an average laboratory energy of 320 MeV show good agreement with the Koch-Moniz-Ohtsuka isobar-hole calculation. Taken together with the good fit made by the model to the elastic pion scattering from 4 He, they indicate substantial support for the theoretical approach, at least close to the peak of the resonance.…”
Section: Physical Review Lettersmentioning
confidence: 64%
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“…Our data gave results of 33 ±4 and 0.16 ±0.03 ^b/sr at an average incident laboratory photon energy of 313 MeV, compared to published measured values of 30 ±2 and 0.17 ±0.02 jub/sr for /r° and /, respectively. 4 ' 12 Our final cross sections are compared with the calcula- We conclude that our measurements of the coherent photon-scattering cross section for 4 He at an average laboratory energy of 320 MeV show good agreement with the Koch-Moniz-Ohtsuka isobar-hole calculation. Taken together with the good fit made by the model to the elastic pion scattering from 4 He, they indicate substantial support for the theoretical approach, at least close to the peak of the resonance.…”
Section: Physical Review Lettersmentioning
confidence: 64%
“…Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (Received 8 August 1988) We have measured the differential cross sections for coherent Compton photon scattering in the reaction 4 He(/,y) 4 He at laboratory angles of 24°, 30°, 45°, and 60° with an average laboratory photon energy of 320 MeV, at 22° with 358 MeV, and at 30° with 260 MeV. These measurements are the first unambiguous test of the A-hole formalism for this reaction near the peak of the cross section for the A resonance.…”
Section: G Dodsonmentioning
confidence: 99%
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“…The d a t a from Ref. [14] at 320 MeV and our calculation for intermediate sets made up of the nucleon and A(1232), these plus P waves, and all of the states up to N=2 are plotted in Fig. 12.…”
Section: A Low-energy Limitmentioning
confidence: 99%