THE ELASTIC SCATTERING OF 5-Bev $pi$ to the minus MESONS ON HYDROGEN (thesis)
Technical Report
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OSTI ID:4193905
The results of the elastic scattering of 5-Bev negative pious on hydrogen are reported in detail. A description of the propane bubble chamber is given. Two different methcds of identification of events are described, and the errors that limit the accuracy of each are considered. Particular attention is directed to the problem of background events. It is shown that approximately 7( plus or minus 3)% of the events called elastic are background. The data are analyzed in terms of the optical model because the angular distribution shows the sharp rise in the forward direction characteristic of diffraction scattering. The modified least-squares procedure used to fit the data is outlined. From the least-squares representation of the best-fitting curve, it is found that d sigma (O)/d omega = 29 8 mb/sterad in the center-of-mass system, and the pion radius of the proton is 1.04 plus or minus 0.05 x 10/sup -13/ cm. The total elastic cross section is 5.6 plus or minus O.5 mb. The results are compared with those derived from theory and other experiments. It is shown that the assumption that the proton acts like a black sphere leads to an elastic cross section much higher than observed. From the above value of the differential cross section in the forward direction, the total hydrogen cross section is found to be 29.1 plus or minus 2.9 mb. This leads to a value for the opacity of the sphere of 0.69 plus or minus 0.05. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-14-008065
- OSTI ID:
- 4193905
- Report Number(s):
- UCRL-8965
- Country of Publication:
- United States
- Language:
- English
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