Measurement of the dp -&gt; He-3 eta reaction near threshold

Smyrski, J.; Kamys, B.; Budzanowski, A.; Gil, D.; Zipper, W.; Khoukaz, A.; Winter, P.; Oelert, W.; Ritman, J.; Täschner, A.; Przerwa, J.; Rozek, T.; Janusz, M.; Sefzick, T.; Grzonka, D.; Wüstner, P.; Wolke, M.; Czyzykiewicz, R.; Piskor-Ignatowicz, C.; Czerwinski, E.; Siemaszko, M.; Moskal, P.; Jarczyk, L.; Adam, H.-H.; Klaja, P.

doi:10.1016/j.physletb.2007.04.021

Journal Article

Measurement of the dp -> He-3 eta reaction near threshold

Smyrski, J. ; Adam, H.-H. ; Budzanowski, A. ; Czerwinski, E.FZJ* ; Czyzykiewicz, R.FZJ* ; Gil, D. ; Grzonka, D.FZJ* ; Janusz, M.FZJ* ; Jarczyk, L. ; Kamys, B. ; Khoukaz, A. ; Klaja, P.FZJ* ; Moskal, P.FZJ* ; Oelert, W.FZJ* ; Piskor-Ignatowicz, C.FZJ* ; Przerwa, J.FZJ* ; Ritman, J.FZJ* ; Rozek, T.FZJ* ; Sefzick, T.FZJ* ; Siemaszko, M. ; Täschner, A. ; Winter, P.FZJ* ; Wolke, M.FZJ* ; Wüstner, P.FZJ* ; Zipper, W.

2007
North-Holland Publ. Amsterdam

Physics letters / B 649, 258 - 262 (2007) [10.1016/j.physletb.2007.04.021]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10528 doi:10.1016/j.physletb.2007.04.021

Abstract: Total and differential cross sections for the dp -> He-3 eta reaction have been measured near threshold for He-3 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 He-3 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 He-3-eta scattering length of vertical bar a vertical bar = 4.3 +/- 0.5fm. (C) 2007 Elsevier B.V. All rights reserved.

Keyword(s): p deuteron: exclusive reaction ; eta: hadroproduction ; helium: nuclide ; threshold ; channel cross section: energy dependence ; angular distribution: asymmetry ; final-state interaction ; eta nucleus: scattering length ; magnetic spectrometer: experimental results ; Juelich COSY PS ; deuteron p --> helium-3 eta ; approx. 1.57 GeV/c/nucleon ; meson production (auto) ; final state interaction (auto) ; eta-mesic nucleus (auto)