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Abstract
A high-statistics measurement of the reaction π −p→ ηn; η→2 γ has been performed at the 70 GeV Serpukhov accelerator for 15, 20, 25, 30 and 40 GeV/ c incident pion momentum using the NICE set-up with its associated 648-channel hodoscope spectrometer for γ-ray detection. It is found that the spin-flip and non-spin-flip amplitudes can be parametrized, for small | t|, as exponentials with the same slopes to within a few percent. For | t| ≳ 1 (GeV/ c) 2 there is a break in the differential cross section. In addition, the A 2 effective trajectory deviates markedly for | t| ≳ 1 GeV/ c) 2 from the linear behaviour valid for smaller | t|.
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