Acta Physica Polonica B, Volume 29, No. 11, Year 1998
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The magnetic spectrometer BIG KARL is used to get energy calibration fix-points for the external beam of COSY-Jülich. These fixpoints were obtained by measuring the meson-production reaction pp → dπ+ close to threshold and at the beam momentum, where the forward pions and the backward deuterons have the same momentum.