Proton polarization from π+ absorption in He3

S. MayTal-Beck, J. Aclander, A. Altman, D. Ashery, H. Hahn, M. A. Moinester, A. Rahav, A. Feltham, G. Jones, M. Pavan, M. Sevior, D. Hutcheon, D. Ottewell, G. R. Smith, and J. A. Niskanen
Phys. Rev. Lett. 68, 3012 – Published 18 May 1992
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Abstract

We present the first polarization measurements for pion absorption on a nucleus heavier than the deuteron. The polarization of protons resulting from π+ absorption in the He3 was measured at bombarding energies of 120 and 250 MeV. Protons from absorption in a quasideuteron were selected by applying kinematical constraints. A significant discrepancy was observed between the experimental results and theoretical predictions. At 120 MeV the measured polarizations for He3 are consistent with those of the deuteron. At 250 MeV the angular distribution of the polarization is significantly different than for the deuteron, showing sensitivity to the nuclear density, and thus may be sensitive to short range correlations between nucleons.

  • Received 27 January 1992

DOI:https://doi.org/10.1103/PhysRevLett.68.3012

©1992 American Physical Society

Authors & Affiliations

S. MayTal-Beck, J. Aclander, A. Altman, D. Ashery, H. Hahn, M. A. Moinester, and A. Rahav

  • School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel Aviv, Israel

A. Feltham, G. Jones, M. Pavan, and M. Sevior

  • Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

D. Hutcheon, D. Ottewell, and G. R. Smith

  • TRIUMF, Vancouver, British Columbia, Canada V6T 2A3

J. A. Niskanen

  • Department of Theoretical Physics, University of Helsinki, Helsinki, Finland

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Vol. 68, Iss. 20 — 18 May 1992

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