PHYSICAL REVIEW LETTERS OCTOBER 1, 1958 thenG^ = 13.7; G v int =8.2; G^KA =2.3; G NKl: = 1.8(y 5 in K ints.), G 7rN = 13.7; G fflnt = 8.2; %KA = 2 -2 ; %jra = 1.8 (no y 5 in tf ints.). If the calculated results for the relative sign of G vN to G n int and G NKA to G NKS can be carried over to the ^--coupling constants, the heavy-fermion mass degeneracy must be broken by the ZK{ A, S) interactions. Possible Lagrangians are +ffi{^W[y 5 d + f 3 ^)/ 2 +U-?3 *)/2]*j -011 r^ #y 5 (l+f 3 ^)/ 2 "(I " fa ^)/2]*i} (y 5 in tf ints.).(3)The y 5 multiplies (l-f 3 y)/2 instead of (l+f 3 y)/ 2 for the case of "no y 5 in K ints." Another K interaction, L tf = gK^^o" iT U^i) 0(y B , 1) #±, 1

We present here some results of a mass analysis of the secondary particles produced at 15.9° to the circulating beam in an aluminum target bombarded by 25-Gev protons in the CERN proton synchrotron.The apparatus (Fig. 1) essentially was a mass spectrometer where the momentum of a particle was determined in the magnet M and its velocity was measured by timing the particle between counters 1 and 3. The distance between 1 and 3 was 27 m, which corresponds to a time of flight of 90 nanoseconds for light. Counter 3 was at 61 m from the target and subtended at the target a solid angle of 1.61 xlO" 6 steradian. A time sorter, 1 preceded by zero-crossing circuits and gated by the coincidence 123, was used to display the time difference between the pulses in counters 1 and 3, with the pulses in 1 suitably delayed. The total time range displayed in the 100 channels of the time sorter was ~15 nsec.Typical spectra for positive and negative particles are shown in Fig. 2. The pion peak (which in fact contains a small contamination of muons and electrons) indicates that the time resolution of the apparatus is about 0.9 nsec. The greater width of the proton peak is caused by the spread in flight times due to the finite momentum band (Ap/p ~ 3%) accepted by the magnet.The results obtained for negative particles Gov ^Proton BeamShielding Wall

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