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A. Altman; E. Piasetzky; J. Lichtenstadt; A. I. Yavin; D. Ashery; R. J. Powers; W. Bertl; L. Felawka; H. K. Walter; R. G. Winter; J. v. d. Pluym

doi:10.1103/PhysRevLett.50.1187

Observation of a Quasideuteron Component in the Reaction ${}^{12}C (π^{+}, 2 p)$

A. Altman, E. Piasetzky, J. Lichtenstadt, A. I. Yavin, D. Ashery, R. J. Powers, W. Bertl, L. Felawka, H. K. Walter, R. G. Winter, and J. v. d. Pluym

Phys. Rev. Lett. 50, 1187 – Published 18 April 1983

Abstract

The reaction ${}^{12}C (π^{+}, 2 p)$ was studied at 165 and 245 MeV over a broad kinematic range by coincidence measurement of the outgoing protons. The $p - p$ angular correlations and proton energy spectra allow an identification of the "quasideuteron" component of the reaction. The angular distribution of this component has a shape similar to that of the $π^{+} d \to pp$ reaction. It is found that one-step quasideuteron absorption accounts for at most 25% of the total absorption cross section.

Received 29 March 1982

DOI:https://doi.org/10.1103/PhysRevLett.50.1187

Authors & Affiliations

A. Altman, E. Piasetzky^*, J. Lichtenstadt, and A. I. Yavin

Physics Department, Tel Aviv University, Ramal Aviv, Tel Aviv, Israel

D. Ashery^†

Argonne National Laboratory, Argonne, Illinois 60439

R. J. Powers^‡

Physikinstitut der Universitat Zürich, CH-8001 Zürich, Switzerland

W. Bertl, L. Felawka, and H. K. Walter

Laboratorium für IIochenergie der Eidgenössische Technische Hochschule Zürich, CH-5234 Villigen, Switzerland

R. G. Winter

Universitat Zürich, CH-8001 Zürich, Switzerland, and College of William and Mary, Williamsburg, Virginia 23185

J. v. d. Pluym

Natuurkundig Laboratorium, Vrije Universiteit, 1007 MC Amsterdam, Netherlands

^*Present address: Clinton P. Anderson Meson Physics Facility, Los Alamos, N.M. 87545.
^†Permanent address: Tel Aviv University, Ramat Aviv, Tel Aviv, Israel.
^‡Permanent address: California Institute of Technology, Pasadena, Cal. 91125.