Measurement of the dp→He3η reaction near threshold

Authors :: 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.
Ritman, J.
Rożek, T.
Sefzick, T.
Siemaszko, M.
Täschner, A.
Winter, P.
Wolke, M.
Wüstner, P.
Zipper, W.
Source :: Physics Letters B. (4):258-262
Publisher :: Elsevier B.V.
Abstract: Total and differential cross sections for the dp→He3η reaction have been measured near threshold for He3 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 He3 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 He3–η scattering length of |a|=4.3±0.5 fm.