Unusual decay of a χ-meson

Anderson, F. S. B.; Lawlor, G.; Nevin, T. E.

doi:10.1007/bf02826519

Cited by 7 publications

(2 citation statements)

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“…If both b and c are regarded as protons but two neutrons are also emitted according to the reaction iW*->p+p+n+n+T-+Q, a binding energy less than or equal to -4. 8 The second event is produced in a five-prong Krcapture star and is shown in Fig. 2.…”

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confidence: 99%

Binding Energy of Tritium Hyperfragments

et al. 1956

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Emulsion stacks of Ilford G-5 exposed to 7r~-meson and ir~-meson beams of the Berkeley Bevatron have been scanned for iT-meson and hyperon events. An event initiated by a 3.0-Bev TT~ meson is described which is interpreted as mesonic decay of a tritium hyperfragment according to the scheme: iH?*-+p-\-p+n+7r~+Q. All of the charged particles from the decay come to rest in the stack. The binding energy of the A 0 is found to be 1.4±0.6 Mev. Two additional cases of the same decay scheme are described, one produced in a iC~-capture star, another in a 4.3-Bev iT star, yielding binding energies B.E. (A 0 ) < 1.3±0.6 Mev and B.E. (A 0 ) =3.3±2.0 Mev, respectively. A weighted average of these three events gives B.E.(A°) = 1.4±0.5 Mev, and of all iH 3 * events reported, including those found by other workers, B.E.(A°)=0.5zfc:0.3 Mev.

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confidence: 99%

Binding Energy of Tritium Hyperfragments

et al. 1956

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“…This relation should also hold for an electron pair from the subsequent decay no-+y+e++e-and this has been verified in a number of events (e.g. Anderson, Lawlor andNevin 1955 b, Crussard, Fouche, Henessy, Kayas, Leprince-Ringuet, Morellet andRenard 1956 a). Finally this mode (4.3) is also able to account for the K+ decay reported by Hodson, Ballam, Arnold, Harris, Rau, Reynolds and Treiman (1954), which led to five charged particles, consisting of two electron pairs and a pion or muon.…”

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confidence: 61%

K Mesons and Hyperons their strong and weak interactions

Dalitz

1957

Rep. Prog. Phys.

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This article surveys our empirical knowledge of the production processes, the nuclear interactions and the decay processes of K particles and hyperons, as this appeared at the close of 1956, and interprets these phenomena within the framework of the chargeindependent classification scheme proposed by Gell-Mann and by Nishijima for these ' strange particles '. T h e assignment of a ' strangeness ' quantum number to each strongly interacting particle is a deep-lying aspect of this scheme, and the main qualitative features of the empirical data allow a direct interpretation in terms of a law of conservation of strangeness through all strong interactions. Where appropriate, more detailed analyses of the phenomena are made on the assumption that charge independence holds for these strong interactions.The evidence on decay processes for K particles and hyperons is discussed in some detail. These processes violate the strangeness conservation law and also involve changes in the total isotopic spin for those cases where this quantity is relevant for the final particles.The success of Gell-Mann's AT = 8 rule in accounting for certain aspects of the decay data is considered for each of the latter cases ; this rule is given a simple origin in Schwinger's model for strange particle decay processes, which is discussed briefly. T h e implications of symmetry between particle and antiparticle, as pointed out by Gell-Mann and Pais for c and Planck's constant fi each have the value unity. However these symbols will sometimes be retained in the formulae in order to display the dimensional character of the quantities considered.

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