The Lifetime and Decay Modes of Negative K Mesons Page: 9 of 55
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Since that time two groups have reported more systematic studies:
Eisenberg et al. 10 have made a systematic study of about 1600 K
mesons in emulsion and found two events which they have identified
as T and 38 stars" in flight with one lightly ionizing secondary
and no-indication-of an interaction, 22 of which they find analyzable.
They report good examples of K a>Yd K, modes and report
relative abundances among modes exclusive of T -as'
65 18% K plus Ke3 and some K3;
30 12% Kr2 plus some K , perhaps one K ;
Their value for the lifetime is
Tk- = (1.60 0.3) X 10-8 sec.
Nilsson and Frisk have observed 21 possible decays in a systematic
study of K mesons and report conclusive evidence for T, K 2, and
K e3 modes as well as events consistent with K 3 , K T2, and K n3
and the abundance ratios ' /(K L + Tr) = 0.15 and K n2/ K~2 = 0.43.
Their lifetime value.is (1.50 -0.30 - X 10 sec. Other measurements
indicate a K -meson lifetime consistent with that of the positive meson,
but it is clear that a much better knowledge of .K -meson lifetime as
well as of branching ratios .is needed to establish the above-mentioned
The study of K -meson decays is made much-more. difficult than
the comparable positive meson study by the lower production of K
mesons and the- strong K~-meson-nucleon interaction. Since the K /K+
production ratio is only about 0.01, K~-meson beams will be 1% as
intense as similar. K -meson beams. More serious are the complications
introduced by the strong nuclear interaction of K mesons. In contrast
to the K meson, which decays. upon coming to rest, the K undergoes
nuclear capture so that. only decays in flight are observed. These
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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/m1/9/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.