No abstract

Phys. Rev. D 4, 1937. 4~h e Compton subtraction was performed in the following manner. Since the IT' and Compton data of Anderson3) were obtained using the same proton spectrometers, we assumed that the relative normalization of these experiments was correct. By comparing our raw (ff + Compton) data with those of Anderson et a l . (Ref. 3), we found that our results had to be renormalized upwards by 20% so as to agree with their measurements. We have been unable to find the source of this discrepancy. After this renormalization we performed the subtraction using the measured points by Anderson et al., or by extrapolating their data both on t and photon energy (for the 18-GeV points). As stated in the text, no points where the subtraction was larger than 20% were presented. In the region where this experiment makes a new contribution 1-t >1.4 (~e~/ d~l , the subtraction never amounted to more than a few percent. 5~. S. Ball, G. Marchesini, and F. Zachariasen, Phys. Lett. m, 583 (1970).The reaction cross sections for K + and K -mesons in carbon and copper have been measured, at a momentum of 2.95 GeV/c, with an optical spark-chamber apparatus. In order to minimize instrumental biases, every incoming kaon triggered the system, regardless of whether o r not an interaction occurred.

We propose to study diffractive phenomena caused by 100 BeV pions, using a new technique, which consists in associating with the high energy interaction, the detection of photons resulting from the de-excitation of nuclear levels.Knowledge of the quantum numbers both for the ground state and t~e nuclear levels of the nuclei used, adds information as to the type of interaction. In particular, the use of the 4.4 MeV leve,l of Carbon guarantees that the exchange quantum has isotopic spin O. In addition, evidence resulting from our tests at Berkeley seems to further encourage the notion that this level selects to a good extent phenomena of the diffractive type.We ask for 150 hours of running on a 100 BeV/c pion beam.