Abstract
Abstract 23.6 metres of K−-meson track in nuclear emulsion have yielded unbiased samples of 815 absorptions at rest and 106 in flight. The corresponding interaction mean free path is 21.5+2.3 −1.9 cm for K−-meaons of energy below 90 Mev. Observations are reported on the disintegration stars themselves and on the charged hyperons produced. It is in particular noted that the angular correlation between hyperon and pion in two-pronged stars is closely that expected for a system without any nuclear interaction in the final state. It is shown that this and other aspects of the situation are most simply explained if the K−-meson is absorbed in the tenuous outer surface of the nucleus from a high Bohr orbit according to the model of Jones, and is not absorbed uniformly throughout the nuclear volume as is usually assumed. This surface absorption model allows of a strong hyperon-nucleon interaction such as appears to be indicated by a variety of other evidence and which would be inconsistent with the volume absorption model.
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