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20 April 2024

» arxiv » 0806.4942

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Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements
M. Bashkanov ; C. Bargholtz ; M. Berlowski ; D. Bogoslawsky ; H. Calen ; H. Clement ; L. Demiroers ; E. Doroshkevich ; D. Duniec ; C. Ekstrom ; K. Fransson ; L. Geren ; L. Gustafsson ; B. Hoistad ; G. Ivanov ; M. Jacewicz ; E. Jiganov ; T. Johansson ; O. Khakimova ; S. Keleta ; I. Koch ; F. Kren ; S. Kullander ; A. Kupsc ; K. Lindberg ; P. Marciniewski ; R. Meier ; B. Morosov ; C. Pauly ; H. Pettersson ; Y. Petukhov ; A. Povtorejko ; A. Pricking ; R.J.M.Y. Ruber ; K. Schonning ; W. Scobel ; B. Shwartz ; T. Skorodko ; V. Sopov ; J. Stepaniak ; P.-E. Tegner ; P. Thorngren-Engblom ; V. Tikhomirov ; A. Turowiecki ; G.J. Wagner ; M. Wolke ; J. Zabierowski ; I. Zartova ; J. Zlomanczuk ;
Date:	30 Jun 2008
Abstract:	The ABC effect - a puzzling low-mass enhancement in the $pipi$ invariant mass spectrum - is well-known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on first exclusive and kinematically complete measurements of solid statistics, which have been carried out at CELSIUS-WASA for the fusion reactions leading to d and $^3$He in the final states. These measurements reveal the ABC effect to be a $sigma$ channel phenomenon associated with the formation of an isoscalar dibaryonic resonance in connection with a $DeltaDelta$ system in the intermediate state. A corresponding theoretical ansatz provides an adequate description both for the differential distributions and for the resonance-like energy dependence of the integral cross section.
Source:	arXiv, 0806.4942
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