Other
Scientific paper
Mar 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960phrv..117.1364b&link_type=abstract
Physical Review, vol. 117, Issue 5, pp. 1364-1375
Other
38
Scientific paper
The bremsstrahlung beam of the Cornell Bev electron synchrotron has been used to study the reaction γ+p-->π0+p over the photon energy range 250 Mev to 1 Bev, and for center-of-mass pion angles between 20° and 70°. The recoil protons, of energies between 10 and 60 Mev, were identified and their energies determined using a range telescope of eight thin plastic scintillators enclosed in a vacuum chamber with the thin liquid hydrogen target. Correlated pulse-height information was obtained by photographing an oscilloscope display and was used to sort out the protons from mesons and electrons. Corrections were made for the background of photoprotons from the Mylar target cup, the energy loss of the protons in the liquid hydrogen, absorption and scattering in the counter telescope, and the variation of beam intensity profile with energy. Compared with previous experiments and extrapolations the results show a somewhat smaller forward differential cross section above 400 Mev. The angular distributions obtained from a least-squares fit to all existing data indicate a d32 assignment for the 760-Mev resonance level. Other implications of the data are also discussed.
Berkelman Karl
Waggoner James A.
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