Two-pion production in deuteron-deuteron collisions at low energies

Fäldt, Göran; Tengblad, Ulla; Wilkin, C.

doi:10.1140/epja/i2006-10051-7

Cited by 1 publication

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References 21 publications

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“…Not only does this model reproduce quantitatively the missing-mass spectra obtained between 0.8 and 2.4 GeV [13], it also predicts quite well the measured deuteron analyzing powers [14]. On the other hand, both this and other dynamical models [28] fail completely to describe the low energy data [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Exclusive measurement of two-pion production in the reaction

et al. 2009

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The results from the first kinematically complete measurement of the 4 He dd ππ → reaction are reported. The aim was to investigate a long standing puzzle regarding the origin of the peculiar ππ−invariant mass distributions appearing in double pion production in light ion collisions, the socalled ABC effect. The measurements were performed at the incident deuteron energies of 712 MeV and 1029 MeV, with the WASA detector assembly at CELSIUS in Uppsala, Sweden. We report the observation of a characteristic enhancement at low ππ-invariant mass at 712 MeV, the lowest energy yet. At the higher energy, in addition to confirming previous experimental observations, our results reveal a strong angular dependence of the pions in the overall centre of mass system. The results are qualitatively reproduced by a theoretical model, according to which the ABC effect is described as resulting from a kinematical enhancement in the production of the pion pairs from two parallel and independent NN dπ → sub-processes.

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Section: Introductionmentioning

confidence: 99%