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Inelastic muon interactions in nuclear emulsion at 2.5 and 5.0 GeV

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Il Nuovo Cimento A (1965-1970)

Summary

The inelastic scattering of high-energy muons from emulsion nuclei was measured with the use of a monoenergetic beam of 2.5 GeV/c and 5.0 GeV/c muons produced at the Brookhaven Alternating Gradient Synchrotron. Ilford G-5 stacks were exposed perpendicularly to the beam and Ilford K-5 stacks were exposed parallel to the beam. Area scanning resulted in a total of 135 events with four-momentum transfers greater than 26 MeV/c. The observed scattering distribution which extends up to 10 degrees, or a momentum transfer of about 900 MeV/c, is in good agreement with the predictions of the electromagnetic theory assuming single-photon exchange. There were also observed four events with scattering angles greater than 10 degrees which are not inconsistent with the theory. Pion production was observed with the major contribution coming from the 3/2, 3/2 resonance. The cross-sections for this process were found to be (3.6±0.7) and (5.1±0.5) microbarn for muon momenta of 2.5 and 5.0 GeV/c, respectively. Events involving much lower energy exchanges were found to have much larger cross-sections and were consistent with «giant resonance» photodisintegration observations.

Riassunto

Si è misurato lo scattering anelastico di muoni di alta energia sui nuclei dell'emulsione facendo uso di un fascio monoenergetico di muoni di 2.5 GeV/c e 5.0 GeV/c prodotto nel sincrotrone a gradiente alternato di Brookhaven. Si sono esposti pacchi di Ilford G-5 perpendicolarmente al fascio e pacchi di Ilford K-5 parallelamente al fascio. L'esplorazione di superficie diede un totale di 135 eventi con quadrimomento trasferito maggiore di 26 MeV/c. La distribuzione di scattering osservata che si estende sino a 10 gradi, o ad un momento trasferito di circa 900 MeV/c, è in buon accordo con le predizioni della teoria elettromagnetica nella ipotesi di scambio di un solo fotone. Furono osservati auche quattro eventi con angoli di scattering maggiori di 10 gradi che non discordano con la teoria. Si è riscontrata produzione di pioni cui il contributo maggiore derivava dalla risonanza 3/2, 3/2. Si è trovato che le sezioni d'urto per questo processo sono (3.6±0.7) e (5.1±0.5) microbarn per muoni di 2.5 e 5.0 GeV/c, rispettivamente. Si è trovato che gli eventi che comportano scambi di energia molto minori hanno sezioni d'urto molto maggiori e concordano con le osservazioni della fotodisintegrazione della «risonanza gigante».

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Authors and Affiliations

  1. Department of Physics, University of Washington, Seattle, Wash, USA

    J. A. Kirk, D. M. Cottrell, J. J. Lord & R. J. Piserchio

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  1. J. A. Kirk
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  2. D. M. Cottrell
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  3. J. J. Lord
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  4. R. J. Piserchio
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Additional information

Supported in part by the U. S. Office of Naval Research, Contract Nr. 477(12) and the Charles A. Coffin Fund of the General Electric Foundation.

Traduzione a cura della Redazione.

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Kirk, J.A., Cottrell, D.M., Lord, J.J. et al. Inelastic muon interactions in nuclear emulsion at 2.5 and 5.0 GeV. Nuovo Cimento A (1965-1970) 40, 523–541 (1965). https://doi.org/10.1007/BF02721042

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  • DOI: https://doi.org/10.1007/BF02721042

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