ABC effect in double-pionic nuclear fusion and a pn resonance as its possible origin

WASA-at-COSY Collaboration, M. Bashkanov*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A short overview over the ABC phenomenon is given, which is known since 50 years without any satisfactory explanation On the basis of new exclusive and kinematically complete data obtained with the WASA detector at COSY we show that this phenomenon is linked with a resonant energy dependence in the total cross section of isoscalar double-pionic fusion processes This resonance structure is connected with the baryon-baryon system, in particular with the pn and Delta Delta systems, however, has a mass, which is 90 MeV below the nominal Delta Delta threshold and a width of only 70 MeV, i e five times smaller than expected from a conventional t-channel Delta Delta scenario

Original languageEnglish
Pages (from-to)1339-1341
Number of pages3
JournalChinese Physics C
Volume34
Issue number9
Publication statusPublished - 1 Sep 2010
Event5th International Conference on Quarks and Nuclear Physics (QNP09) - Beijing
Duration: 21 Sep 200925 Sep 2009

Keywords

  • ABC effect
  • baryon-baryon resonance
  • double-pionic fusion
  • isoscalar resonance
  • PROTON-PROTON COLLISIONS
  • PI-PI INTERACTION
  • 2-PION PRODUCTION
  • ROPER RESONANCE
  • EXCLUSIVE MEASUREMENTS
  • CROSS-SECTIONS
  • SINGLE-PION
  • S-WAVE
  • GEV-C
  • ENHANCEMENT

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