Abstract
Examination of the nature of all tracks ending in the emulsion and decaying into a fast secondary has led to the observation of five unstable particles heavier than the
π
-meson. Of these, one has been shown to have a mass greater than that of the proton (Bonetti, Levi Setti, Panetti & Tomasini 1953); we describe here the other four, which enter into the class of
K
-particles (O’Ceallaigh 1951; Crussard, Mabboux, Morellet, Orkin-Lecourtois & Trembley 1952; Menon 1952; Powell 1952; Levi Setti & Tomasini 1952; Isachsen, Vangen & Sørensen 1953; Crussard, Leprince-Ringuet, Morellet, Orkin-Lecourtois & Trembley 1953). Two of the four
K
-particles,
K
1
and
K
4
, came from outside the emulsion, and were found during the measurements on the
μ
-decay spectrum. The other two,
K
*
2
and
K
*
3
, were produced in stars in the emulsion.
Reference10 articles.
1. K% 30 + 8a - 4 29-4
2. K* 34+ 6 - 1 0 16-2
3. K t 16 + 3p - 6 51-9
4. K *d 29 + 4n - 6 5-3
5. k p2 13+ 18p ---------- 28-4
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3 articles.
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