The Lifetime and Decay Modes of Negative K Mesons Page: 41 of 55
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assumption of 100% efficiency.for detecting secondaries emitted with
a c.m. angle greater than 120 deg or less than 60 deg.
An estimate of an' ppeir limiit to this number may be' made as
follows. Thirteen decaylike nuclear interactions were found which
presumably represent the reactions
K +ns- A n-
20 f -T-
Since there are 1.24 times as many neutrons as bound protons in
emulsion, we would expect 11 true disappearances in flight from the
K f bound A- Tr0
From the 81 meters of K -meson track followed we would expect
two interactions on free hydrogen of.the type
K p - Y O+ T
and one charge-exchange scatter. This same ratio among the "clean"
interactions wiLh bound protono would predict five true disappearances
from charge-exchange scatterings on.bound.protons.. This predicts a
total of 19 true disappearances or 19 undetected secondaries. Of the
decaylike events with secondaries of ionization less than that of a 10-cm
pion, 20% are nuclear. .interactions. This same ratio among the undetected
secondaries would leave.a total of 15 undetected decay secondaries.
A.third estimate (which is probably not as. reliable) can be made
by comparing the percentage of clearn zero-prong interactions at
rest with that of the in-flight interactions. This ratio is 146 = 0.068,
which would predict 25 disappearances in-flight and 13 undetected
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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/m1/41/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.