Measurement of the dp -> 3He[eta] reaction near threshold
- Smyrski, J.
- Adam, H. H.
- Budzanowski, A.
- Czerwiński, E.
- Czyżykiewicz, R.
- Gil, D.
- Grzonka, D.
- Janusz, M.
- Jarczyk, L.
- Kamys, B.
- Khoukaz, A.
- Klaja, P.
- Mersmann, T.
- Moskal, P.
- Oelert, W.
- Piskor-Ignatowicz, C.
- Przerwa, J.
- Rejdych, B.
- J. Ritman, J.
- Rożek, T.
- Sefzick, T.
- Siemaszko, Marek
- Taschner, A.
- Winter, P.
- Wolke, M.
- Wustner, P.
- Zipper, Wiktor
Publication date
January 2007
DOI Publisher
Elsevier BV Journal
Physics Letters B Language
EnglishAbstract
Total and differential cross sections for the dp --> 3He eta reaction have been measured near threshold for 3He center-of-mass momenta in the range from 17.1 MeV/c to 87.5 MeV/c. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target detecting the 3He ejectiles with the COSY-11 facility. The forward-backward asymmetries of the differential cross sections deviate clearly from zero for center-of-mass momenta above 50 MeV/c indicating the presence of higher partial waves in the final state. Below 50 MeV/c center-of-mass momenta a fit of the final state enhancement factor to the data of the total cross sections results in the 3He eta scattering length of a = |2.9 +/- 0.6| + i (3.2 +/- 0.4) fm
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