Beta ray spectra
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. In part I the various methods of determining the energy distributions of electrons are described. Reasons are given for the choice of a semi-circular focusing spectrograph. The const...
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1939
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| Online Access: | https://thesis.library.caltech.edu/2638/1/Oppenheimer_f_1939.pdf Oppenheimer, Frank (1939) Beta ray spectra. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/MXNR-VW86. https://resolver.caltech.edu/CaltechETD:etd-06182004-140920 <https://resolver.caltech.edu/CaltechETD:etd-06182004-140920> |
| Summary: | NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.
In part I the various methods of determining the energy distributions of electrons are described. Reasons are given for the choice of a semi-circular focusing spectrograph. The construction of the magnet, the spectrograph box, the field measuring devices and the coincidence Geiger-Muller counters are given in considerable detail.
In part II the experimental energy distributions of the [...] nuclear electrons are described. In addition the distribution of the internally converted electrons from the [...] mev gamma ray and of the secondary electrons from the gamma rays of [...] and [...] are given. The connection between the these gamma rays the complexity of the Beta spectra is discussed. In those cases where an independant estimate of the energy of the radio-active transformation is available there seems to be a discrepancy between this independent estimate and the experimental value for the end point of the continuous beta spectra. Several possible explanations of the discrepancies are discussed.
In the appendix the calculations of the distribution of the interally converted electrons from the Th Pb gamma ray are given.
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