Year: 2015
Type: article
Abstract: Exclusive and kinematically complete measurements of the double pionic fusion to ${}^{3}\mathrm{He}$ have been performed in the energy region of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the $\ensuremath{\pi}\ensuremath{\pi}$-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY (the cooler synchrotron at Forschungszentrum J\"ulich). Similar to the observations in the basic $pn\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ reaction and in the $dd\ensuremath{\rightarrow}{}^{4}\mathrm{He}\phantom{\rule{0.16em}{0ex}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. Differential cross sections are well described by the hypothesis of ${d}^{*}$ resonance formation during the reaction process in addition to the conventional $t$-channel $\ensuremath{\Delta}\ensuremath{\Delta}$ mechanism. The deduced ${d}^{*}$ resonance width can be understood from collision broadening due to Fermi motion of the nucleons in initial and final nuclei.
Source: Physical Review C
Authors: P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F. S. Bergmann, M. Berłowski, H. Bhatt, A. Bondar, 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, B. Höistad, N. Hüsken, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, F. A. Khan, A. Khoukaz, D. A. Kirillov, S. Kistryn, H. Kleines, B. Kłos, W. Krzemień, P. Kulessa, A. Kupść, A. Kuzmin, 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, E. Perez del Rio, N. M. Piskunov, P. Podkopał, D. Prasuhn, A. Pricking, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, S. Sawant, S. Schadmand, T. Sefzick, V. Serdyuk, B. Shwartz, 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, M. Wolke, A. Wrońska, P. Wüstner, P. Wurm, A. Yamamoto, L. Yurev, J. Zabierowski, M. J. Zieliński, A. Zink, J. Złomańczuk, P. Żuprański, M. Żurek
Institutions: Uppsala University, National Centre for Nuclear Research, Jagiellonian University, University of Tübingen, University of Münster, Indian Institute of Technology Bombay, Novosibirsk State University, Siberian Branch of the Russian Academy of Sciences, Budker Institute of Nuclear Physics, Forschungszentrum Jülich, Ruhr University Bochum, Friedrich-Alexander-Universität Erlangen-Nürnberg, Institute for Theoretical and Experimental Physics, Justus-Liebig-Universität Gießen, Indian Institute of Technology Indore, Petersburg Nuclear Physics Institute, Joint Institute for Nuclear Research, University of Silesia in Katowice, Institute of Nuclear Physics, Polish Academy of Sciences, National Research Tomsk State University, High Energy Accelerator Research Organization
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G4382436812, G4705065538
OpenAlex ID: W2005759462