The Lifetime and Decay Modes of Negative K Mesons Page: 37 of 55
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The spectrum used for pions from interactions was calculated
for all interactions in flight, and may:not .be correct-:for. decaylike
interactions,- as it might be expected that the.pions from them would
have scattered less within the nucleus and would leave the nucleus
with greater energy.. However, Eisenberg et al. find that the
pions from events in flight with no stable prongs seem to have the
same spectrum as those from all events in flight, which would indicate
they do scatter as much. The decaylike interactions in this study are
also consistent with this assumption, although not enough data have
been obtained in either study to determine the pion spectrum of decay-
like interactions. So that 'the effect of this spectrum on the final results
might be seen, the P. were determined for an extreme case--a
uniform spectrum from 100 to 400 Mev/c. This yielded a total of
17453 interactions among the 48 decaylike events, 'compared with
12;78 for the spectrum used. - Eisenberg et al. have analyzed
K'-meson-nuclear interactions in flight which have a blob and one
pion secondary, and find that 70% do not fit the kinematics of. either
of the two-body decay modes. Nine of the decaylike events were not
consistent with any mode, which would predict a total of .12.9 decaylike
interactions if the ratios are the same for events with and without
The decaylike events are not an unbiased sample, because the
secondaries missed are most probably the more lightly ionizing
two-body modes. The problem of the undLected secondaries was
complicated by differing minimum blob densities in the different
development batches and a particularly low blob density in one of
them. Each of the disappearances in flight was re-examined twice
by competent observers; three. additional secondaries were found on
the first rescan and one on the second rescan. The efficiency. of
the scanners for detecting the electrons from muon decays was
determined previously to be better than 95% in pellicles with-a
minimum blob density near. that of the highest in the 2B stack (19
blobs per 100 microns). However, three factors act to lessen the
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Nickols, N. A. The Lifetime and Decay Modes of Negative K Mesons, thesis or dissertation, September 1, 1959; United States. (https://digital.library.unt.edu/ark:/67531/metadc1015953/m1/37/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.