Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2010-07-05
Phys.Rev.C82:035208,2010
Physics
Nuclear Physics
Nuclear Experiment
15 pages, 12 figures
Scientific paper
10.1103/PhysRevC.82.035208
The gp-->etap reaction has been measured with the Crystal Ball and TAPS multiphoton spectrometers in the energy range from the production threshold of 707 MeV to 1.4 GeV (1.49 =< W >= 1.87 GeV). Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz Microtron MAMI-C and momentum analyzed by the Glasgow Tagging Spectrometer were used for the eta-meson production. Our accumulation of 3.8 x 10^6 gp-->etap-->3pi0p-->6gp events allows a detailed study of the reaction dynamics. The gp-->etap differential cross sections were determined for 120 energy bins and the full range of the production angles. Our data show a dip near W = 1680 MeV in the total cross section caused by a substantial dip in eta production at forward angles. The data are compared to predictions of previous SAID and MAID partial-wave analyses and to thelatest SAID and MAID fits that have included our data.
Aguar-Bartolomepmainz P.
Akasoy L. K.
Annand J. R. M.
Arends H.-J.
Arndt Richard A.
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