Phys. Rev. C 65, 024003 (2002) [18 pages]

Spin correlations in p⃗p⃗→pnπ⁺ pion production near threshold

Abstract

References

Citing Articles (11)

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W. W. Daehnick^*, Swapan K. Saha^†, and R. W. Flammang^‡
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260

H. O. Meyer, J. T. Balewski, R. E. Pollock, B. von Przewoski, T. Rinckel, P. Thörngren-Engblom^§, and A. Wellinghausen^**
Department of Physics and Cyclotron Facility, Indiana University, Bloomington, Indiana 47405

B. Lorentz^††, F. Rathmann^††, B. Schwartz, and T. Wise
University of Wisconsin-Madison, Madison, Wisconsin 53706

P. V. Pancella
Western Michigan University, Kalamazoo, Michigan 49008

Received 6 August 2001; published 25 January 2002

A first measurement of longitudinal as well as transverse spin correlation coefficients for the reaction p⃗p⃗→pnπ⁺ is made using a polarized proton target and a polarized proton beam. We report kinematically complete measurements for this reaction at 325-, 350-, 375-, and 400-MeV beam energies. The spin correlation coefficients A_xx+A_yy, A_xx-A_yy, A_zz, and A_xz and the analyzing power A_y, as well as angular distributions for σ(θ_π) and the polarization observables A_ij(θ_π), are extracted. Partial wave cross sections for dominant transition channels are obtained from a partial-wave analysis that included transitions with final-state angular momenta of l<~1. The measurements of the p⃗p⃗→pnπ⁺ polarization observables are compared with the predictions from the Jülich meson exchange model. The agreement is very good at 325 MeV, but it deteriorates increasingly for the higher energies. At all energies agreement with the model is better than for the reaction p⃗p⃗→ppπ⁰.

URL:

http://link.aps.org/doi/10.1103/PhysRevC.65.024003

DOI:

10.1103/PhysRevC.65.024003

PACS:

24.80.+y, 24.70.+s, 25.10.+s, 29.20.Dh

^*Email address: daehnick@pitt.edu

^†Permanent address: Bose Institute, Calcutta 700009, India.

^‡Present address: Westinghouse Nuclear, Pittsburgh, Pennsylvania.

^§Present address: Department of Radiation Science, Uppsala, Sweden.

^**Email address: arne.wellinghausen@gmx.net

^††Present address: Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany.

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Phys. Rev. C 65, 024003 (2002) [18 pages]

Spin correlations in p⃗p⃗→pnπ+ pion production near threshold

Spin correlations in p⃗p⃗→pnπ⁺ pion production near threshold