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Proton compton effect

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Il Nuovo Cimento (1955-1965)

Summary

The elastic scattering of photons by protons has been measured for 100 MeV to 290 MeV photons at 90° c.m.s. and 139° c.m.s. scattering angles. The expected large increase in cross-section is observed at energies approaching that of (3/2, 3/2) pion-nucleon resonance. The scattering can be qualitatively explained by the ordinary Thomson amplitude combined with that of the (3/2, 3/2) resonance. A more detailed examination of the cross-section in the region just above the photo-meson threshold has shown that it is sensitive to the π0 photon coupling. From the experimental data, one may conclude that the π0 mean life should be between 10−16 and 10−18 s.

Riassunto

La diffusione elastica dei fotoni da protoni è stata misurata con fotoni tra 100 e 290 MeV agli angoli di 90° e 139° c.m. È stato osservato l’aumento previsto della sezione d’urto alle energie prossime a quella della risonanza (3/2, 3/2) del sistema pione-nucleone. La diffusione si può spiegare qualitativamente con la combinazione dell’ampiezza Thomson con quella della risonanza (3/2, 3/2). Uno studio più dettagliato nella regione immediatamente al di sopra della soglia di fotoproduzione ha mostrato che la sezione d’urto è sensibile all’accoppiamento del mesone π0 con i fotoni. Dai dati sperimentali si può concludere che la vita media del π0 deve essere compresa fra 10−16 e 10−16 s.

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Author notes

  1. G. Bernardini & T. Yamagata

    Present address: CERN, Geneva

  2. A. C. Odian

    Present address: Istituto Superiore di Sanità, Roma

  3. L. B. Auerbach

    Present address: University of California, Berkeley, Cal.

  4. I. Filosofo

    Present address: the Armour Research Foundation, Chicago, Ill.

Authors and Affiliations

  1. University of Illinois, Urbana, Ill.

    G. Bernardini, A. O. Hanson, A. C. Odian, T. Yamagata & L. B. Auerbach

  2. CERN, Geneva

    G. Bernardini, A. O. Hanson, A. C. Odian, T. Yamagata & L. B. Auerbach

  3. Istituto di Fisica dell’Università, Padova

    I. Filosofo

Authors
  1. G. Bernardini
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  2. A. O. Hanson
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  3. A. C. Odian
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  4. T. Yamagata
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  5. L. B. Auerbach
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  6. I. Filosofo
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Additional information

At the University of Illinois with an OEEC Grant awarded by the Foreign Operations Administration, Washington D.C.

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Bernardini, G., Hanson, A.O., Odian, A.C. et al. Proton compton effect. Nuovo Cim 18, 1203–1236 (1960). https://doi.org/10.1007/BF02733177

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  • DOI: https://doi.org/10.1007/BF02733177

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