Observation of the ABC effect and final-state isospin

E. A. Doroshkevich*, M. A. Bashkanov, H. Clement, E. Perez del Rio, A. Pricking, T. Yu Skorodko, G. J. Wagner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Despite the number of inclusive measurements of the pionic fusion reactions, the nature of the ABC effect discovered in 1960 was not completely established. Exclusive measurements of the doublepion-production reactions leading to either fused d, He-3 and He-4 nuclear final states or pp pairs are analyzed. A significant ABC effect-enhancement in the region of low pi pi mass-is found only in the isoscalar pi pi channel while in the isovector channels it is small or absent. For the reaction with isovector pp final state an ABC effect was not observed even at the special kinematic conditions to reproduce a quasi-bound two-proton state. The total cross sections for the d and 4He fusion reactions show similar resonance-like energy dependence.

Original languageEnglish
Pages (from-to)936-940
Number of pages5
JournalPhysics of Atomic Nuclei
Volume77
Issue number7
DOIs
Publication statusPublished - Jul 2014

Keywords

  • PI-PI INTERACTION
  • EXCLUSIVE MEASUREMENTS
  • MESON PRODUCTION
  • GEV-C
  • INCLUSIVE REACTION
  • COLLISIONS
  • HE-3

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