Implications of the Intenrxediate Boson Basis of the Weak Interactions : Existence of a Quartet of Intermediate Bosons and Their Dual Isotopic Spin Transformation Properties

(ptt++ —), and the remaining two are completely analyzed with missing mass evaluation consistent with single neutral pion emission (pp+ —0). The k values of these seven triple production collisions are distributed between 0.5 and unity with a threshold value of 0.42. It might be expected that the anelasticity characteristic of a nucleon-nucleon collision would rise from a threshold, determined by the pion multiplicity, and exhibit a form dependent on the primary energy. Our results indicate that the characteristics for both double and triple production pass through broad maxima about 50%%uq above the respective thresholds, then fall to a low value as k approaches unity. This similarity occurs even though the c.m. kinetic energy distribution of pions from triple production collisions differs from that for double production, as shown in Fig. 2. Our limited information regarding the velocities and directions of motion of the emitted nucleons enables, for some of the interactions, the determination of Q values of possible isobaric states. It is evident that the measurements shown in Fig. 2 must be regarded with reserve. This caution is necessary because a fraction of the emergent pions in these experiments is not identified. The reason for this is twofold—failure to distinguish pions from protons close to the forward direction and emission at large laboratorysystem angles when produced in the backward hemisphere. Also, the selection of stars on the basis of analyzable pions might introduce a bias in favor of low values of k. On the other hand, the chance inclusion of a proton-nucleus collision, which otherwise satisfies all the criteria for a p-p collision, might lead to the inference of unduly high anelasticity. As the available energy in the c.m. system increases, the threshold values of k for production of a few pions drop toward zero. Measurements on jets" suggest that at very large energies the maximum of the k distribution may follow the threshold down. The observations made here indicate that this tendency is true even at low energies. Our present results lead to an average value of k for double and triple production, k=0.55&0.10, similar to results obtained at higher energies and comprising multiplicities up to six."The widespread nature of the k distribution, however, shows that an average value of k is not very meaningful. "B.Edwards et at. , Phil. Mag. 3, 237 (1958). 'r V. S. Barashenkov et a/. , Nuclear Phys. 9, 74 (1959).