Elsevier

Nuclear Physics B

Volume 125, Issue 2, 11 July 1977, Pages 157-161
Nuclear Physics B

Forward photoproduction of neutral pions on polarized protons in the third resonance region

https://doi.org/10.1016/0550-3213(77)90399-6Get rights and content

Abstract

Angular distributions of the target symmetry for the reaction γ + p → π0 + p have been measured at the Bonn 2.5 GeV Electron Synchrotron at pion c.m. angles between 13° and 63° and photon energies of 1.0 and 1.1 GeV. The π0 mesons were detected by their two decay photons with total absorption lead-glass Čerenkov counters. Butanol was used as target material in a continuous flow 3He cryostat operating at 0.5 K and 25 kG. The π0 counting rate from free protons in the butanol target was derived from the measurements of the differential cross section on hydrogen. The data are compared with data of other laboratories and the results of two recent partial-wave analyses.

References (17)

  • L.A. Copley et al.

    Phys. Letters

    (1969)
  • W.J. Metcalf et al.

    Nucl. Phys.

    (1974)
  • R.C.E. Devenish et al.

    Phys. Letters

    (1974)
  • R.L. Crawford

    Nucl. Phys.

    (1975)
  • W. Brefeld et al.

    Nucl. Phys.

    (1975)
  • K.H. Althoff et al.

    Nucl. Phys.

    (1973)
  • H. Herr et al.

    Nucl. Instr.

    (1974)
  • P. Feller

    Phys. Letters

    (1975)
There are more references available in the full text version of this article.

Cited by (0)

1

We are indebted to Professors K.H. Althoff, G. Knop, G. Nöldeke and W. Paul for their constant interest and support. We want to thank Professor H.M. Fischer for useful discussions. The detectors were placed at our disposal by DESY. We gratefully acknowledge the support of the DESY Direktorium. The experiment was made possible by the helpful assistance of the technical staff of the Bonn Synchrotron group. The Monte Carlo calculations were done on an IBM 370/165 computer of the Regionales Hochschulrechenzentrum, Univ. Bonn.

Now at I. Physikalisches Institut der RWTH Aachen.

★★

Visitor from Nagoya University, Japan.

View full text