Coherent production of pions in high energy π-interactions

  • A. A. Kamal
  • Y. V. Rao
  • Rukmini Rao


From an analysis of 12 ‘clean’ pion tridents produced in 17.2 GeV/c π-interactions in emulsion nuclei, the distributions of the longitudinal and transverse momentum of recoil nuclei are obtained. The distribution of transverse momentum of recoil nuclei for the combined data of Caforioet al., Azimovet al., and the present experiment is compared with the expected curves for various assumptions. It is demonstrated that the best fit is for the assumptions (a) only light nuclei contribute to the coherent process and (b) all nuclei contribute equally. It is stressed that the conclusion of Caforioet al., that the light nuclei do not play an important role is based on the discrepancy between the observed and expected mean free path which is critically hinged on the cross-section obtained in the heavy liquid bubble chamber—a cross-section whose value is uncertain.


Transverse Momentum Target Nucleus Light Nucleus AgBr Neutral Pion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Feinberg, E. L. and Pomeranchuk, I. YaSuppl. Nuovo Cimento, 1956,3, 652.CrossRefGoogle Scholar
  2. 2.
    Good, M. L. and Walker, W. D.Phys. Rev., 1960,120, 1855 and 1857.CrossRefGoogle Scholar
  3. 3.
    Ferretti, B...Nuovo Cimento, 1961,19, 193.CrossRefGoogle Scholar
  4. 4.
    Matthews, P. T. and Salam, A.Ibid., 1961,21, 127.Google Scholar
  5. 5.
    Caforio, A., Ferraro, D., Semeraro, S., Fisher, C. M., Mason, A., Venus, W. A., Evans, D., Hossain, A., Votruba, M. F., Wataghin, A., Kasim, M. M., Shaukat, M. S., Herz, A. J., Sichirollo, A. E. and Vegni, G.Ibid., 1964,32, 1471.CrossRefGoogle Scholar
  6. 6.
    Bellini, G., Fiorini, E., Herz, A. J., Negri, P. and Ratti, S.Ibid., 1963,29, 896.CrossRefGoogle Scholar
  7. 7.
    Belenkii, S. Z...Soviet Phys. JETP., 1956,3, 813.Google Scholar
  8. 8.
    Azimov, S. A., Beter, E. V., Gulyamov, U. G., Eroshkina, N. B. and Levin, A. Ya.Soviet J. Nucl. Phys., 1966.2, 747.Google Scholar
  9. 9.
    Alder, K., Bohr, A., Huus, T., Mottelson, B. and Winther, A.Rev. Modern Phys., 1956,28, 432.MATHCrossRefMathSciNetGoogle Scholar

Copyright information

© Indian Academy of Sciences 1969

Authors and Affiliations

  • A. A. Kamal
    • 1
  • Y. V. Rao
    • 1
  • Rukmini Rao
    • 1
  1. 1.Department of PhysicsOsmania UniversityHyderabad-7India

Personalised recommendations