• Medientyp: E-Artikel
  • Titel: ABC effect and resonance structure in the double-pionic fusion to ${}^{3}\mathrm{He}$
  • Beteiligte: Adlarson, P. [Verfasser:in]; Augustyniak, W. [Verfasser:in]; Ciepał, I. [Verfasser:in]; Żuprański, P. [Verfasser:in]; Żurek, M. [Verfasser:in]; WASA-at-COSY Collaboration [Verfasser:in]; Clement, H. [Verfasser:in]; Coderre, D. [Verfasser:in]; Czerwiński, E. [Verfasser:in]; Demmich, K. [Verfasser:in]; Doroshkevich, E. [Verfasser:in]; Engels, R. [Verfasser:in]; Erven, A. [Verfasser:in]; Eyrich, W. [Verfasser:in]; Fedorets, P. [Verfasser:in]; Bardan, W. [Verfasser:in]; Föhl, K. [Verfasser:in]; Fransson, K. [Verfasser:in]; Goldenbaum, F. [Verfasser:in]; Goslawski, P. [Verfasser:in]; Goswami, A. [Verfasser:in]; Grigoryev, K. [Verfasser:in]; Gullström, C.-O. [Verfasser:in]; Hauenstein, F. [Verfasser:in]; [...]
  • Erschienen: Inst., 2015
  • Erschienen in: Physical review / C 91(1), 015201 (2015). doi:10.1103/PhysRevC.91.015201
  • Sprache: Englisch
  • DOI: https://doi.org/10.1103/PhysRevC.91.015201
  • ISSN: 1089-490X; 0556-2813
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  • Beschreibung: Exclusive and kinematically complete measurements of the double pionic fusion to 3He have been performed in the energy region of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the ππ-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY (the cooler synchrotron at Forschungszentrum Jülich). Similar to the observations in the basic pn→dπ0π0 reaction and in the dd→4Heπ0π0 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 ΔΔ mechanism. The deduced d∗ resonance width can be understood from collision broadening due to Fermi motion of the nucleons in initial and final nuclei.
  • Zugangsstatus: Freier Zugang