Precision study of the $\mathit{dp}\ensuremath{\rightarrow}^{3}\mathrm{He}\ensuremath{\eta}$ reaction for excess energies between 20 and 60 MeV

Precision study of the $dp \to {}^{3}{He} η$ reaction for excess energies between 20 and 60 MeV

T. Rausmann, A. Khoukaz, M. Büscher, D. Chiladze, S. Dymov, M. Hartmann, A. Kacharava, I. Keshelashvili, P. Kulessa, Y. Maeda, T. Mersmann, M. Mielke, S. Mikirtychiants, M. Nekipelov, H. Ohm, M. Papenbrock, F. Rathmann, V. Serdyuk, H. Ströher, A. Täschner, Yu. Valdau, and C. Wilkin (ANKE Collaboration)

Phys. Rev. C 80, 017001 – Published 17 July 2009

Abstract

The differential and total cross sections for the $dp \to {}^{3}{He} η$ reaction have been measured at COSY–ANKE at excess energies of 19.5, 39.4, and 59.4 MeV over the full angular range. The results are in line with trends apparent from the detailed near-threshold studies and also largely agree with those from CELSIUS, though the present data have much better angular coverage near the forward and backward directions, thus allowing firmer conclusions to be drawn. While at 19.5 MeV the results can be described in terms of $s$ - and $p$ -wave production, by 59.4 MeV higher partial waves are required. Including the 19.5 MeV point together with the near-threshold data in a global $s$ - and $p$ -wave fit gives a poorer overall description of the data though the position of the pole in the $η {}^{3}{He}$ scattering amplitude, corresponding to the quasibound or virtual state, is hardly changed.

Received 28 May 2009

DOI:https://doi.org/10.1103/PhysRevC.80.017001

Authors & Affiliations

T. Rausmann^1,*, A. Khoukaz¹, M. Büscher², D. Chiladze^2,3, S. Dymov^4,5, M. Hartmann², A. Kacharava², I. Keshelashvili⁶, P. Kulessa⁷, Y. Maeda⁸, T. Mersmann¹, M. Mielke¹, S. Mikirtychiants⁹, M. Nekipelov², H. Ohm², M. Papenbrock¹, F. Rathmann², V. Serdyuk⁵, H. Ströher², A. Täschner¹, Yu. Valdau⁹, and C. Wilkin¹⁰ (ANKE Collaboration)

¹Institut für Kernphysik, Universität Münster, D-48149 Münster, Germany
²Institut für Kernphysik and Jülich Centre for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
³High Energy Physics Institute, Tbilisi State University, 0186 Tbilisi, Georgia
⁴Physikalisches Institut II, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
⁵Laboratory of Nuclear Problems, JINR, RU-141980 Dubna, Russia
⁶Physics Department, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
⁷H. Niewodniczanski Institute of Nuclear Physics PAN, PL-31342 Cracow, Poland
⁸Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
⁹High Energy Physics Department, Petersburg Nuclear Physics Institute, RU-188350 Gatchina, Russia
¹⁰Physics and Astronomy Department, UCL, Gower Street, London WC1E 6BT, United Kingdom

^*trausmann@uni-muenster.de

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Vol. 80, Iss. 1 — July 2009

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Physical Review C

covering nuclear physics

Precision study of the $dp \to {}^{3}{He} η$ reaction for excess energies between 20 and 60 MeV

Phys. Rev. C 80, 017001 – Published 17 July 2009

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Physical Review C

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Precision study of the dp→He3η reaction for excess energies between 20 and 60 MeV

Phys. Rev. C 80, 017001 – Published 17 July 2009

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Precision study of the $dp \to {}^{3}{He} η$ reaction for excess energies between 20 and 60 MeV