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Träfflista för sökning "WFRF:(Khakimova O.) srt2:(2007)"

Sökning: WFRF:(Khakimova O.) > (2007)

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1.
  • Khakimova, O., et al. (författare)
  • Observation of the abc effect in the first exclusive measurements of pn -> d pi(0)pi(0)
  • 2007
  • Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 22:2-3, s. 617-620
  • Tidskriftsartikel (refereegranskat)abstract
    • The reaction pn → dπ0π0 constitutes the most fundamental system for the study of the ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of the ππ system in double-pionic fusion to nuclear bound states. The first exclusive measurements of this reaction have now been carried out at CELSIUS-WASA. They exhibit a striking low-mass enhancement in the ππ invariant mass spectrum, prove it to be a σ-channel phenomenon and falsify conventional theoretical models, which predict an associated high-mass enhancement not present in the new exclusive data. In the kinematically complete data sample we observe a ΔΔ excitation, where the interaction between the two Δ obviously plays a crucial role for the generation of the ππ low-mass enhancement.
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2.
  • Thörngren Engblom, Pia, et al. (författare)
  • Anisotropy in the pion angular distribution of the reaction pp -> pp pi(0) at 400 MeV
  • 2007
  • Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 76:1, s. 011602-
  • Tidskriftsartikel (refereegranskat)abstract
    • The reaction pp -> pp pi(0) was studied with the WASA detector at the CELSIUS storage ring. The center of mass angular distribution of the pi(0) was obtained by detection of the gamma decay products together with the two outgoing protons and found to be anisotropic with a negative second derivative slope, in agreement with the theoretical predictions from a microscopic calculation.
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