Search

A beam of small production angle and large acceptance has been designed at the CERN Proton Synchrotron in order to yield partially separated, high-intensity beams of antiprotons and K-mesons. The new features of the beam are discussed together with the experimental results.

A study of the depolarization of positive muons has been made which shows that the muon is not affected by depolarization in the slowing down process and that the residual polarization is due to « free » muons. The accuracy of the results on the muon depolarization in ten different materials is an order of magnitude better than previously existing data.

The range of highly relativistic muons has been measured. The results of the experiment are presented and compared with the theoretical expectations. The agreement between experiment and theory is estabilished to be within 2% up to a value ofγ as high as 23.

The results of an experiment which show the existence of antideuterons in the production process proton-beryllium are reported.

An electron detector, which consists of five elements, each one being made of a lead layer followed by a plastic scintillation counter and a two-gap spark chamber, is described. The rejection power of this new detector against pions is of the order of 4·10−4, the efficiency for electron detection varies from 75% to 85%, and the energy resolution can be as good as 10%, in the energy range 1.1 GeV to 2.5 GeV.

The results of a systematic study on the quenching of muon depolarization as a function of a variable magnetic field parallel to the original muon polarization are reported. The data obtained are relative to values of the magnetic field which range from 0 to 4 kG, and are compared with predictions of the various muonium formation theories.