### PHOTOPRODUCTION OF $pi$sup 0$MESONS FROM HYDROGEN IN THE REGION 900 to 1200 MEVPHOTOPRODUCTION OF$pi$sup 0$ MESONS FROM HYDROGEN IN THE REGION 900 to 1200 MEV

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 Author Jackson, H. E. ♦ DeWire, J. W. ♦ Littauer, R. M. Source United States Department of Energy Office of Scientific and Technical Information Content type Text Language English
 Subject Keyword PHYSICS ♦ ANGULAR DISTRIBUTION ♦ ANGULAR MOMENTUM ♦ COINCIDENCE METHODS ♦ CROSS SECTIONS ♦ DECAY ♦ ENERGY ♦ GEV RANGE ♦ HYDROGEN ♦ INTERACTIONS ♦ MOMENTUM ♦ PHOTONS ♦ PHOTOPRODUCTION ♦ PIONS ♦ PROTONS ♦ RECOILS ♦ RESONANCE Abstract The reaction gamma + p yields pi /sup 0/ + p was studied in three adjacent 100-Mev energy intervals between 900 and 1200 Mev and at pion center-of- mass angles of 47 deg . 90 deg . and 125 deg . The reaction was observed as a coincidence between the recoil proton and one of the photons from the meson"s decay. The kinematics were determined by the energy of the incident photon and the angle of the recoil proton. The differential cross sections at the forward and backward angles showed pronounced maxima near 1050 Mev: whereas. the 90 deg cross sections decreased slowly with energy. The estimated total cross sections suggested a narrow maximum near 1050 Mev. These features were consistent with the previously proposed existence of a resonant state in the pion-nucleon system of total angular momentum 5/2. (auth) ISSN 0031899X Educational Use Research Learning Resource Type Article Publisher Date 1960-08-15 Publisher Department Cornell Univ., Ithaca, N.Y. Journal Physical Review Volume Number 119 Organization Cornell Univ., Ithaca, N.Y.