A QDDM magnetic spectrograph system in use for nuclear pion production experiments at IUCF☆

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Abstract

The quadrupole-dipole-dipole-multipole (QDDM) magnetic spectrograph and associated experimental methods employed at the Indiana University Cyclotron Facility for studies of the A(p,π±)A + 1 reaction are described. The techniques have been used successfully for extensive measurements of the energy-mass- and state-dependence of (p, π+) differential cross sections in the near threshold region (Tπ = 9 to 60 MeV), and for measurement of the polarization asymmetry in the (p, π−) reaction. Backg round levels of about 0.1 nb/sr and an energy resolution of 63 keV fwhm have been achieved.

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    • ☆

    Work supported by the National Science Foundation.

    ∗∗

    Present address: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, U.S.A.

    ∗∗∗

    Present address: Department of Physics, University of Illinois, Urbana, III. 61801, U.S.A.

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    Copyright © 1981 Published by Elsevier B.V.