Acta Physica Polonica B

Vol. 33, No. 3, March 2002, page 883


Measurement and Analysis of the pd\to 3He \eta Reaction Between 930 and 1100 MeV

J. Zlomanczuk, R. Bilger, W. Brodowski, H. Calen, H. Clement, C. Ekstroem, G. Faeldt, K. Fransson, L. Gustafsson, B. Hoeistad, A. Johansson, T. Johansson, K. Kilian, S. Kullander, A. Kupsc, G. Kurz, P. Marciniewski, B. Morosov, A. Moertsell, W. Oelert, V. Renken, R.J.M.Y. Ruber, B. Shwartz, J. Stepaniak, A. Sukhanov, P. Thoerngren-Engblom, A. Turowiecki, G.J. Wagner, Z. Wilhelmi, C. Wilkin, J. Zabierowski

Recent measurements of the pd \rightarrow 3He \eta reaction at four beam energies: 930, 965, 1037 and 1100 MeV have shown that the total cross section is nearly constant throughout the whole energy region, despite the CM angular distributions becoming more anisotropic with increasing energy. The data join smoothly onto the results of near-threshold measurements, which are dominated by the s-wave \eta 3He final state interaction. At all the energies the differential cross section is maximal for cos \theta \eta \approx +0.5. The data are used to develop a Monte Carlo description of the pd\to 3He \eta reaction based on a two-step model proposed by Kilian and Nann. With one free parameter the model qualitatively reproduces the excitation function in the energy range of this experiment but fails to reproduce the angular distributions.

PACS numbers: 25.40.--h, 25.10.+s, 25.40.Ve


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