Abstract
IT is well known that a heavy nuclear fragment begins to capture its orbital electrons when its velocity slows down below a certain limit. Consequently, its track observed in photographic emulsion shows ‘thinning-down’ near the end of its range. The length L of this thinning-down depends on the nature of the nucleus. Assuming Bohr's model, Freier et al.1 have carried out an approximate calculation of L as a function of the atomic number of the nucleus; their results are reproduced in the accompanying graph (solid line). It will be seen that the length L in microns can be expressed by an approximate formula:
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References
Freier et al., Phys. Rev., 74, 1828 (1948).
Hoang, Tchang-fong, J. Phys. (in the press).
Hoang, Tchang-fong, and Morellet, D., C.R. Acad. Sci., Paris, 231, 695 (1950).
Perkins, Proc. Phys. Soc., A (Oct. 1950).
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HOANG, TF. Thinning-down Effect in Nuclear Photographic Tracks. Nature 167, 644–645 (1951). https://doi.org/10.1038/167644a0
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DOI: https://doi.org/10.1038/167644a0
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