On the Excitation of Gamma-rays by Fast Neutrons
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概要
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Fluorescent gamma-rays from 32 elements excited by Li-D neutrons were observed by aluminium wall Geiger-Mtiller counter. Effective mean. neutron energy was (stimated to bs about 10 Mev. Observed gamma-ray. intensities, after correcting for experimental conditions and divided by the number of atoms in the specimens, increase almost linearly with atomic weight A up to A〓120 and then become almost constant or slightly decrease at heavier elements. Gamma-ray intensity of uranium is strong but would be ascribed to fission. These results were discussed utilizing statistical theory and it is suggested that the apparent level spacings beyond A〓120 do not decrease with A, or even become greater, possibly due to the partial excitation of nucleus. Mean energies of gamma-rays for several elements were estimated by the absorption in lead plates and were found to lie between 0.6 and 3 Mev.
- 社団法人日本物理学会の論文
- 1952-06-25
著者
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Wakatsuki Tetsuo
Department of Cardiology, Tokushima University School of Medicine
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Sugimoto Kenzo
Department Of Physics And Laboratory Of Nuclear Studies Faculty Of Science Osaka University
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