Tagging Of Eta Mesons Using The Pd -> He-3 Eta Reaction Near Threshold

Chr. Bargholtz,L. Gerén,V. N. Grebenev,Yu. B. Gurov,V. S. Karpukhin,I. V. Laukhin,B. V. Martem’yanov,V. A. Matveev,K. Lindberg,V. S. Sopov,P.-E. Tegnér,B. A. Chernyshev,R. R. Shafigullin,I. Zartova

INSTRUMENTS AND EXPERIMENTAL TECHNIQUES（2006）

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摘要

A zero-degree spectrometer for tagging eta mesons on the CELSIUS/WASA facility is described, and its characteristics are presented. Tagging of eta mesons is performed by detecting 3 He ions produced by reaction pd -> He-3 eta close to the production threshold. The low background level (< 2%) is in good agreement with the data obtained earlier on the SATURNE accelerator.

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