Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-06-30
Phys.Rev.Lett.102:052301,2009
Physics
Nuclear Physics
Nuclear Experiment
Scientific paper
10.1103/PhysRevLett.102.052301
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. Here we report on first exclusive and kinematically complete measurements of the most basic double pionic fusion reaction $pn \to d \pi^0\pi^0$ at 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 resonance-like 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.
Bargholtz Chr.
Bashkanov M.
Berlowski M.
Bogoslawsky D.
Calén H.
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