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Recoil-Proton Polarization in Neutral-Pion Photoproduction Between 1000 and 1800 MeV

N. Tanaka*, M. M. Castro, R. H. Milburn, W. B. Richards†, J. P. Rutherfoord, and B. F. Stearns‡

M. Deutsch, P. M. Patel§, and K. Tsipis∥

  • Department of Physics, Tufts University, Medford, Massachusetts 02155

  • Laboratory of Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

  • *Present Address: Los Alamos Scientific Laboratory, Los Alamos, N. M. 87544.
  • †Present Address: Department of Physics, Oberlin College, Oberlin, Ohio 44074.
  • ‡Present Address: Department of Physics, Hobart and William Smith College, Geneva, N. Y. 14456.
  • §Present Address: Department of Physics, McGill University, Montreal, Quebec.
  • ∥Present Address: Department of Biophysics, Massachusetts Institute of Technology, Cambridge, Mass. 02139.
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Phys. Rev. D 8, 1 – Published 1 July, 1973

DOI: https://doi.org/10.1103/PhysRevD.8.1

Abstract

Measurements are presented of the recoil-proton polarization for π0 photoproduction angles near 64° in the c.m. system. The steep angular dependence observed by others at lower energies persists to at least 1500 MeV, and the polarization crosses through zero near 63° over the entire 900-1600-MeV energy interval. Summary fits are made to available recoil-proton polarization data, 950-1250 MeV, and are found to require terms of order cos3θ, but no higher.

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References (15)

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  6. Omitted endnote

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  9. M. Deutsch, L. Golub, P. Kijewski, D. Potter, D. J. Quinn, and J. Rutherfoord, Phys. Rev. Lett. 29, 1752 (1972) ibid.30, 249(E) (1973)
  10. M. N. Prentice et al., Nucl. Phys. B41, 353 (1972)
  11. P. Blüm et al., Universität Bonn Physikalisches Institut Report No. PI-1-105, 1970 (unpublished)
  12. R. L. Walker, Phys. Rev. 182, 1729 (1969)
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  14. D. E. Lundquist et al., Phys. Rev. 168, 1527 (1968)
  15. [8], page 69

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Phys. Rev. D 8, 1– Published 1 July, 1973
  • Received 27 December 1972

© 1973 American Physical Society

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