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THOMPSON 1953

Thompson, R.W.; Buskirk, A.V.; Etter, L.R.; Karzmark, C.J.; Rediker, R.H.;
The Disintegration of V^o Particles
Phys. Rev. 90 (1953) 329;

Reprinted in
The Physical Review - the First Hundred Years, AIP Press (1995) CD-ROM.

Abstracts
Many V^o particles appear to decay into a proton and negative pion with a Q value in the neighborhood of 35 MeV. However, it has been apparent for some time that there are cases in which the positive fragment is considerably less massive than a proton. Various conjectures as to the decay scheme in such cases have been made: the one (V^o → π π) most frequently discussed having been introduced in the nature of a simplifying assumption. The California Institute of Technology group reports a few cases which may be so interpreted.
The object of this note is to report preliminary results obtained with a new magnet chamber at sea level. The chamber has a field of 7000 gauss over an illuminated volume 22 in. high, 11 in. wide, and 5 in. deep and is actuated by penetrating showers. Measurements of no field tracks indicate that the maximum detectable momentum for long tracks is well in excess of 10¹¹ eV/c. (Extracted from the introductory part of the paper.).

Accelerator COSM Detectors CLOUD

Related references
Analyse data from
R. Armenteros et al., Nature 167 (1951) 501;
R. W. Thompson, H. O. Cohn, and R. S. Flum, Phys. Rev. 83 (1951) 175;
R. B. Leighton, S. D. Wanlass, and C. D. Anderson, Phys. Rev. 89 (1953) 148;
W. B. Fretter, May, and Nakada, Phys. Rev. 89 (1953) 168;
R. Armenteros, K. H. Barker, C. C. Butler, and A. Cachon, Phil. Mag. 42 (1951) 1113;
R. B. Leighton, S. D. Wanlass, and W. L. Alford, Phys. Rev. 83 (1951) 843;

Reactions

	Ko π+ π–
	K+ π+ πo

Particles studied

	Ko	mass
	K+	mass

Record comments
First evidence for K → π π decay.

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