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Break-up and Coherent Photoproduction of η Mesons on the Deuteron
P. Hoffmann-Rothe, M. Krebeck, J. Hey, M. Breuer, G. v. Edel, E. Hourany, M. Rigney, J. Ajaka, G. Anton, J. Arends, G. Berrier-Ronsin, W. Beulertz, G. Blanpied, A. Bock, J.-P. Didelez, K. Helbing, R. Maass, G. Nöldeke, B. Preedom, B. Richie, L. Rosier, B. Saghai, M. Schumacher, and F. Smend
Phys. Rev. Lett. 78, 4697 – Published 23 June 1997
We present new break-up and coherent data for η meson photoproduction on the deuteron, using a deuterium target and tagged bremsstrahlung photons up to 1 GeV. The differential cross sections for the coherent process were measured from threshold to 800 MeV. They are much smaller than those previously reported. The break-up channel provides a direct measurement of the neutron to proton differential cross section ratios. At the S11(1535) resonance peak, σn/σp=0.68±0.06 leading to an isoscalar to isovector amplitude ratio of As/Aυ=0.096±0.02.
- Received 26 November 1996