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Near-threshold η-meson production in the dd↦He η reaction |
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| Authors: | A. Wrońska V. Hejny C. Wilkin S. Dymov C. Hanhart V. Komarov H. R. Koch A. Kulikov A. Magiera T. Mersmann S. Mikirtytchiants H. Ohm D. Prasuhn R. Schleichert H. J. Stein H. Ströher |
| Affiliation: | 1. Institut für Kernphysik, Forschungszentrum Jülich, 52425, Jülich, Germany 2. Institute of Physics, Jagiellonian University, Reymonta 4, 30-059, Cracow, Poland 3. Physics Department, University College London, WC1E 6BT, London, UK 4. Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980, Dubna, Russia 5. Institut für Kernphysik, Universit?t Münster, 48149, Münster, Germany 6. High Energy Physics Department, PNPI, 188350, Gatchina, Russia |
| Abstract: | The dd↦4Heη reaction has been investigated near threshold using the ANKE facility at COSY-Jülich. Both total and differential cross-sections have been measured at two excess energies, Q = 2.6 MeV and 7.7 MeV, with a subthreshold measurement being undertaken at Q = - 2.6 MeV to study the physical background. While consistent with isotropy at the lower energy, the angular distribution reveals a pronounced anisotropy at the higher one, indicating the presence of higher partial waves. Options for the decomposition into partial amplitudes and their consequences for the determination of the s-wave ηα scattering length are discussed. |
| Keywords: | 13.60.Le Meson production 25.10.+s Nuclear reactions involving few-nucleons systems 25.45.-z 2H-induced reactions 11.80.Et Partial-wave analysis |
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