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FRY 1956

Fry, W.F.; Schneps, J.; Swami, M.S.;
Evidence for a Long-Lived Neutral Unstable Particle
Phys. Rev. 103 (1956) 1904;

Reprinted in
R. N. Cahn and G. Goldhaber, The Experimental Foundations of Particle Physics, Cambridge Univ. Press (1991) 208.

Abstracts
In the course of a scan of emulsion exposed to the Bevatron 90^° 280 MeV/c momentum K-beam, four events were found which involve the apparent production of a single strange particle in a low-energy interaction. They are interpreted as due to interactions of long-lived neutral K-particles produced in the target with frequency comparable to that of K⁺-meson production. "Ordinary'' ⁰ particles would have had to live about 20 mean lifetimes. Energetic neutron stars are rare in the stack. (Science Abstracts, 1957, 2684. R. H. W. Johnston).

Accelerator LBL Detectors EMUL

Related references
More (earlier) information appears in
W. F. Fry, J. Schneps, and M. S. Swami, Phys. Rev. 101 (1956) 1526;
See also
M. Gell-Mann and A. Pais, Phys. Rev. 97 (1955) 1387;
G. A. Snow, Phys. Rev. 103 (1956) 1111;

Data comments
⁴He_S is the standard PDG name for strange hyperfragment He⁴.

Reactions

	p nucleus neutral X	6 GeV (Tlab)	angp, p
	neutral nucleus 3HeS X
	3HeS 3He p –
	neutral nucleus K– X

Particles studied

KL

ex

Record comments
Confirmation of the existence of the K_L.

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