Gamma Rays from Strange Particles

Ridgway, S. L.; Berley, D.; Collins, G. B.

doi:10.1103/physrev.104.513

Cited by 13 publications

(3 citation statements)

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“…Those particles whose decay products include a neutral pion will therefore provide a source of y rays in the neighbourhood of the target. Observations of such y rays were first made at Brookhaven by Ridgway, Berley and Collins (1956). The apparatus consisted of a well-collimated y r a y telescope, sensitive only to y rays exceeding 10 MeV.…”

Section: Gamma Ray Observations On Strange Particle Productionmentioning

confidence: 99%

“…5 3 CeV for the free nucleon-nucleon process. Also shown for comparison is the TO excitation function obtained by counting y rays when the target is directly visible (after Ridgway, Berley and Collins 1956).…”

Section: (35)mentioning

confidence: 99%

“…Figure5. The excitation function for y rays produced more than 1.3 cm downstream from a copper target 0.94 cm thick bombarded by protons (afterRidgway, Berley and Collins 1956). …”

mentioning

confidence: 99%

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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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Section: Gamma Ray Observations On Strange Particle Productionmentioning

confidence: 99%

Section: (35)mentioning

confidence: 99%