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Near-threshold η-meson production in the dd↦He η reaction

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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.

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Authors and Affiliations

  1. Institut für Kernphysik, Forschungszentrum Jülich, 52425, Jülich, Germany

    A. Wrońska, V. Hejny, S. Dymov, C. Hanhart, H. R. Koch, H. Ohm, D. Prasuhn, R. Schleichert, H. J. Stein & H. Ströher

  2. Institute of Physics, Jagiellonian University, Reymonta 4, 30-059, Cracow, Poland

    A. Wrońska & A. Magiera

  3. Physics Department, University College London, WC1E 6BT, London, UK

    C. Wilkin

  4. Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980, Dubna, Russia

    S. Dymov, V. Komarov & A. Kulikov

  5. Institut für Kernphysik, Universität Münster, 48149, Münster, Germany

    T. Mersmann

  6. High Energy Physics Department, PNPI, 188350, Gatchina, Russia

    S. Mikirtytchiants

Authors
  1. A. Wrońska
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  2. V. Hejny
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  3. C. Wilkin
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  4. S. Dymov
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  5. C. Hanhart
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  6. V. Komarov
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  7. H. R. Koch
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  8. A. Kulikov
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  9. A. Magiera
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  10. T. Mersmann
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  11. S. Mikirtytchiants
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  12. H. Ohm
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  13. D. Prasuhn
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Wrońska, A., Hejny, V., Wilkin, C. et al. Near-threshold η-meson production in the dd↦He η reaction. Eur. Phys. J. A 26, 421–428 (2005). https://doi.org/10.1140/epja/i2005-10185-0

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  • DOI: https://doi.org/10.1140/epja/i2005-10185-0

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