Photo-protons from heavy elements

Some cross-sections for the photo-production of neutral Pi-mesons from hydrogen at energies from 360 to 938 MeV

“…As can be seen, at the energy at which double-pion production becomes energetically possible, there is a rapid increase in the proton yield. The increases observed are in very crude agreement with those calculated using the data of Brinckmann and Mohr Ell]: detailed agreement is, however, not very satisfactory [10], presumably owing to the limited statistical accuracy of the data in [11].…”

“…The measured beam intensitydistribution is also included among the input data. The performance of the on-line detector and the methods used for analyzing the data have been outlined in some detail in an Internal Report [10], to which the interested reader is referred. Stringent tests of the apparatus and the data-collecting system were made over a long period of time prior to the final datataking runs, to ensure that all possible sources of error were known.…”

“…angle range 60~ ~ are reported. Preliminary results of these measurements were earlier presented to the 1973 Bonn Conference [7] and published elsewhere [8].…”

Cross-sections for the photo-production of ?0-mesons from hydrogen from 238 to 922 MeV

“…The experimental method used has been outlined in [1] and discussed more fully in [3], so that the details need not be repeated here. It is sufficient to state that proton yields from a liquid hydrogen target are measured as a function of bremsstrahlung end-point energy in a counter telescope connected on-line to an IBM 1800 computer.…”

Measurements on the Differential Cross Section of the π° - Photoproduction on Hydrogen

“…The compilation [l] contains at least 20 different experiments with quoted statistical and systematical errors typically 10 %, but the discrepancies between experiments are as much as 40%. Since then, apart from the present measurements, new sets of data have become available from Bonn (GE 74 BONN) [19], Daresbury (BO 73 DARE) [20], (BA 75 DARE) [211, (BO 75 DARE) [221, and Lund (DO 75 LUND) [16]. Reference to further measurements can be found in [23].…”