No abstract
was evinced. It was concluded that the half-life obtained was due to pileup of pulses with lower energy; such pileup should display a half-life of one-half the 7.7-min half-life.The lack of an observed internal conversion line indicates that the 0+, T=l level 2 probably lies above the 7=3, T-0 level. This would require a positron end point for the 0.95-sec activity in K 38 of energy > 4.84 Mev. In any case the above argument indicates that the energy of the transition is greater than 4.76 Mev. CONCLUSIONSThe experimental results reported in this paper together with the half-life measurement of Kline andWe report a comprehensive series of measurements made on the masses of L-mesons produced by the 184-inch cyclotron. A general ratio principle of measurement is employed which largely eliminates systematic errors. The particular method that we have developed is described in detail. The theory of nonequilibrium particle orbits in the cyclotron field is worked out to provide formulas from which momenta may be calculated, and to obtain the momentum distribution functions determined by the target and detector dimensions. The energy-loss processes in nuclear track emulsion, which is used as a stopping material and detector, are studied and the range-momentum exponent q is found. Several small corrections to the mean range are made. A number of range straggling effects are evaluated. The theoretical distribution of the quantity Rp~q (R being the range and p the momentum) is studied, and the first three moments of the distribution are calculated explicitly. The distribution is found to be closely gaussian. From the theory of the distribution of Rp~g, the best estimate and the statistical uncertainty of the mass ratio (e.g., of meson to proton) are evaluated. A number of effects influencing the ratio are studied, but all the corrections found are very small. The * This work was done under the auspices of the U. S. Atomic Energy Commission. 1 Many of the earlier measurements are reviewed in: J. A. ); Koslov, Fitch, and Rainwater, Phys. Rev. 95, 625 (A) (1954); Camac, Piatt, and Schulte, Phys. Rev. 89, 905 (A) (1953); 88, 134 (1952); A. D. McGuire et al., Phys. Rev. 95, 625 (1954).
This data survey represents a merging of two periodic compilations of data -University of California Radiation Laboratory Report UCRL-8030 by Barkas and Rosenfeld, which has been issued several times since 1957, with accompanying wallet cards, and the tables of Matts Roos. ' The wallet cards contain considerably more information than is summarized here; accordingly, they and the complete UCRL-8030 Rev will continue to be available from the Lawrence Radiation Laboratory, University of California, Berkeley. (The wallet cards can be requested in two sizes: 2.5x3.5 in. , to fit American wallets, and 7x10 cm, to fit European wallets. ) We hope that readers will inform us of mistakes and omissions in our data.As the available particle-spectroscopic data have grown, so has the job of compiling them, and we have finally automated the process. Accordingly, all data and references have been punched on cards. Cards are listed on pages 986-996.The data averaging has in most cases been done by a computer program. Further, our program plots ideograms of the input data, so that we can display clearly the cases with inconsistencies which make that averaging fraught with danger. Wherever it is possible, we have calculated a y' for the sample, and if y' is larger than its expectation value, we have written in the tables, after each error, ")& Scale, " where "Scale"=Lcm/(zzzt' -1))&, sV being the number of experiments used in the calculation. Whenever this warning is included, we suggest that the reader look at the appropriate ideogram (pages 997 -1000) and make his own estimates of the experimental situation.
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