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Positive-pion photoproduction at 180° near the second nucleon-pion resonance

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Il Nuovo Cimento A (1965-1970)

Summary

In a previous experiment the cross-section for the photoproduction of pions in hydrogen near the second pion-nucleon resonance has been measured at 135° and 180° in the c.m.s. At 180° the measurements did show a very sharp peak at a gamma-ray energy of 700 MeV. The experiment has now been repeated only at 180°, with improved energy resolution. The new results, in agreement with the old ones, show the same sharp energy dependence at about the same value of the primary energy.

Riassunto

In un precedente esperimento si è misurata la sezione d’urto per la fotoproduzione di pioni positivi in idrogeno a 135° e 180° nel centro di massa vicino alla seconda risonanza pione-nucleone. A 180° le misure hanno indicato un picco molto pronunciato ad un’energia del gamma di 700 MeV. L’esperimento è stato ora ripetuto solamente a 180° migliorando il potere risolutivo sull’energia del gamma. I nuovi risultati sono in accordo con i precedenti e mostrano la stessa dipendenza dall’energia a circa lo stesso valore dell’energia primaria.

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References

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Author notes

  1. C. Schaerf

    Present address: Laboratori Nazionali di Frascati, Frascati

Authors and Affiliations

  1. High-Energy Physics Laboratory, Stanford University, Stanford, Cal.

    C. Schaerf

Authors
  1. C. Schaerf
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Additional information

Work supported in part by the U.S. Office of Naval Research, Contract Nonr. 225(67).

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Schaerf, C. Positive-pion photoproduction at 180° near the second nucleon-pion resonance. Nuovo Cimento A (1965-1970) 44, 504–511 (1966). https://doi.org/10.1007/BF02740870

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  • DOI: https://doi.org/10.1007/BF02740870

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