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Bashkanov, M. [Author]; Bargholtz, C. [Author]; Fransson, K. [Author]; Geren, L. [Author]; Gustafsson, L. [Author]; Höistad, B. [Author]; Ivanov, G. [Author]; Jacewicz, M. [Author]; Jiganov, E. [Author]; Johansson, T. [Author]; Khakimova, O. [Author]; Keleta, S. [Author]; Berlowski, M. [Author]; Koch, I. [Author]; Kren, F. [Author]; Kullander, S. [Author]; Kupsc, A. [Author]; Lindberg, K. [Author]; Marciniewski, P. [Author]; Meier, R. [Author]; Morosov, B. [Author]; Pauly, C. [Author]; Pettersson, H. [Author]; Bogoslawsky, D. [Author]; [...]

Double-Pionic Fusion of Nuclear Systems and the “ABC” Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements

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  • Media type: E-Article
  • Title: Double-Pionic Fusion of Nuclear Systems and the “ABC” Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements
  • Contributor: Bashkanov, M. [Author]; Bargholtz, C. [Author]; Fransson, K. [Author]; Geren, L. [Author]; Gustafsson, L. [Author]; Höistad, B. [Author]; Ivanov, G. [Author]; Jacewicz, M. [Author]; Jiganov, E. [Author]; Johansson, T. [Author]; Khakimova, O. [Author]; Keleta, S. [Author]; Berlowski, M. [Author]; Koch, I. [Author]; Kren, F. [Author]; Kullander, S. [Author]; Kupsc, A. [Author]; Lindberg, K. [Author]; Marciniewski, P. [Author]; Meier, R. [Author]; Morosov, B. [Author]; Pauly, C. [Author]; Pettersson, H. [Author]; Bogoslawsky, D. [Author]; [...]
  • imprint: APS, 2009
  • Published in: Physical review letters 102, 052301 (2009). doi:10.1103/PhysRevLett.102.052301
  • Language: English
  • DOI: https://doi.org/10.1103/PhysRevLett.102.052301
  • ISSN: 0031-9007
  • Keywords: pi: pair production ; magnetic spectrometer: experimental results ; dibaryon: isoscalar ; p n: fusion ; intermediate state: (2Delta(1232)) ; p n --> deuteron 2pi0 ; angular distribution ; Uppsala CELSIUS Stor ; mass spectrum: two-pion ; 1.03: 1.35 GeV-kin ; cross section: energy dependence ; Dalitz plot ; mass enhancement
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  • Description: The ABC effect-a puzzling low-mass enhancement in the pi pi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn -> d pi(0)pi(0) at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (pi pi)(I=L=0) channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a Delta Delta system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.
  • Access State: Open Access