Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements

M. Bashkanov, C. Bargholtz, M. Berlowski +46

The ABC effect - a puzzling low-mass enhancement in the $\pi \pi$ invariant mass spectrum - is well-known from inclusive measurements of two-pion production in nuclear fusion reactions.…