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AbstractAbstract
[en] We discuss the physics objectives of the DLS program with some emphasis on the possible use of dileptons as a probe of pion dynamics in nuclear matter. Data on p + Be reactions at 1-5 GeV and Ca + Ca at 1 GeV/A are presented. The observation of a structure at twice the pion mass in the e+e/sup /minus// invariant mass spectra above 2 GeV beam energy and the excitation function for the p + Be reaction suggest that pion annihilation is the main dielectron source above 2 GeV. The dielectron mass spectrum from Ca + Ca at 1 GeV/A exhibits an inverse slope larger than the one from p + Be at the same beam energy. 14 refs., 9 figs., 1 tab
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Dec 1988; 13 p; 17. INS international symposium on nuclear physics at intermediate energies; Tokyo (Japan); 15-17 Nov 1988; CONF-8811171--2; Available from NTIS, PC A03/MF A01 - OSTI; 1 as DE89007491; Portions of this document are illegible in microfiche products.
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