Jacobs, Earl Donald (1961) A cloud chamber investigation of interactions at energies greater than 50 BEV. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-04062006-140126
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An experiment to measure the inelastic scattering cross-section for nucleons with energies greater than 50 BEV on Iron has been carried out using a large multiplate cloud chamber as the detector and the cosmic-ray flux at Pasadena as the source of nucleons. This cross-section has been found to be 0.56 ± .07 barns and the corresponding nucleon-nucleon cross-section (averaged over protons and neutrons) to be 18 ± 5 mb. The average energy of the events included in the measurement is estimated at 250 BEV. These results have been compared with the inelastic scattering cross-section data available for energies above the [...] meson threshold.
An analysis has been made of the angular distribution of N-rays having energy greater than 50 BEV to determine the absorption mean free path in the atmosphere. Also it is shown that the neutral to charged particle ratio at a known depth in the atmosphere and the ratio of the mean free path for absorption to the mean free path for interaction are related to the average elasticity in nucleon-nucleon collisions, the former setting a lower limit and the latter, an upper limit. The absorption mean free path in the atmosphere is found to be 115 ± 15 gm/cm2 and the elasticity is estimated at (0.27 ± .06) [...] 0.45.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Physics, Mathematics and Astronomy|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1961|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||10 Apr 2006|
|Last Modified:||26 Dec 2012 02:36|
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