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arXiv · 1402.3469

Cross section ratio and angular distributions of the reaction p + d -> 3He + eta at 48.8 MeV and 59.8 MeV excess energy

P. Adlarson·W. Augustyniak·W. Bardan·M. Bashkanov·F. S. Bergmann·M. Berłowski·H. Bhatt·M. Büscher·H. Calén·I. Ciepał·H. Clement·D. Coderre·E. Czerwiński·K. Demmich·E. Doroshkevich·R. Engels·A. Erven·W. Erven·W. Eyrich·P. Fedorets·K. Föhl·K. Fransson·F. Goldenbaum·P. Goslawski·A. Goswami·K. Grigoryev·C. -O. Gullström·F. Hauenstein·L. Heijkenskjöld·V. Hejny·M. Hodana·B. Höistad·N. Hüsken·A. Jany·B. R. Jany·L. Jarczyk·T. Johansson·B. Kamys·G. Kemmerling·F. A. Khan·A. Khoukaz·D. A. Kirillov·S. Kistryn·B. Kłos·H. Kleines·M. Krapp·W. Krzemień·P. Kulessa·A. Kupść·K. Lalwani·D. Lersch·B. Lorentz·A. Magiera·R. Maier·P. Marciniewski·B. Mariański·M. Mikirtychiants·H. --P. Morsch·P. Moskal·H. Ohm·I. Ozerianska·A. Passfeld·E. Perez del Rio·N. M. Piskunov·P. Podkopał·D. Prasuhn·A. Pricking·D. Pszczel·K. Pysz·A. Pyszniak·C. F. Redmer·J. Ritman·A. Roy·Z. Rudy·S. Sawant·S. Schadmand·T. Sefzick·V. Serdyuk·R. Siudak·T. Skorodko·M. Skurzok·J. Smyrski·V. Sopov·R. Stassen·J. Stepaniak·E. Stephan·G. Sterzenbach·H. Stockhorst·H. Ströher·A. Szczurek·A. Täschner·A. Trzciński·R. Varma·G. J. Wagner·W. Węglorz·M. Wolke·A. Wrońska·P. Wüstner·P. Wurm·A. Yamamoto
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Abstract

We present new data for angular distributions and on the cross section ratio of the p + d -> 3He + eta reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum J\"ulich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between Q = 20 MeV and Q = 60 MeV, which might indicate the variation of the production mechanism within this energy interval.

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P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F. S. Bergmann, M. Berłowski, H. Bhatt, M. Büscher, H. Calén, I. Ciepał, H. Clement, D. Coderre, E. Czerwiński, K. Demmich, E. Doroshkevich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. Föhl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, C. -O. Gullström, F. Hauenstein, L. Heijkenskjöld, V. Hejny, M. Hodana, B. Höistad, N. Hüsken, A. Jany, B. R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F. A. Khan, A. Khoukaz, D. A. Kirillov, S. Kistryn, B. Kłos, H. Kleines, M. Krapp, W. Krzemień, P. Kulessa, A. Kupść, K. Lalwani, D. Lersch, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Mariański, M. Mikirtychiants, H. --P. Morsch, P. Moskal, H. Ohm, I. Ozerianska, A. Passfeld, E. Perez del Rio, N. M. Piskunov, P. Podkopał, D. Prasuhn, A. Pricking, D. Pszczel, K. Pysz, A. Pyszniak, C. F. Redmer, J. Ritman, A. Roy, Z. Rudy, S. Sawant, S. Schadmand, T. Sefzick, V. Serdyuk, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, E. Stephan, G. Sterzenbach, H. Stockhorst, H. Ströher, A. Szczurek, A. Täschner, A. Trzciński, R. Varma, G. J. Wagner, W. Węglorz, M. Wolke, A. Wrońska, P. Wüstner, P. Wurm, A. Yamamoto. 2014-02-14. Cross section ratio and angular distributions of the reaction p + d -> 3He + eta at 48.8 MeV and 59.8 MeV excess energy. https://doi.org/10.1140/epja/i2014-14100-4

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