Mass Measurements with Pion Double Charge Exchange


The first discussions1 of pion double charge exchange (DCX) dating back to the early 1960’s mention already the great potential of this reaction to study nuclei far from the line of stability. Early attempts by Gilly et al., at CERN failed because of the low pion intensities available at that time. The situation changed with the advent of high intensity pion beams at the ‘meson factories.’ DCX experiments by Burman et al.3 at the Low Energy Pion (LEP) channel of the Clinton P. Anderson Meson Physics Facility (LAMPF) yielded the first experimental value for the mass of 16Ne via the 16O(π+, π-) reaction. However, these experiments suffered from poor energy resolution (FWHM ~ 4 MeV) and the extracted mass excess for 16Ne is not very accurate (M.E. = 24.4 ± 0.5 MeV). When the Energetic Pion Channel and Spectrometer (EPICS) facility at LAMPF became fully operational, the first pion DCX was studied there by the Northwestern University group.4,5 In the course of these experiments, the mass excess of 18C was measured via the 18O(π-, π+) 18C reaction.5 Since then not only our group but also a collaboration of groups6 from the New Mexico State University, the University of Texas at Austin and the Los Alamos Scientific Laboratory measured masses with pion DCX.


Mass Measurement Mass Excess Phase Space Distribution Neutron Drip Line Ground State Transition 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • H. Nann
    • 1
    • 2
  1. 1.Northwestern UniversityEvanstonUSA
  2. 2.Indiana UniversityBloomingtonUSA

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