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Dielectron production in p+Be and Ca+Ca collisions at the Bevalac

G Roche,G F Krebs,Eric Lallier,A Letessierselvon,H S Matis,C J Naudet,L S Schroeder,P A Seidl,A Yegneswaran,J Bystricky,J T Carroll,John B Gordon,G Igo,T J Hallman,L Madansky,R E Welsh,P Kirk,Z F Wang,D J Miller,G Landaud

Nuclear Physics A（1988）

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Abstract
Dielectron production has been measured in p+Be collisions at 1.0, 2.1 and 4.9 GeV and in Ca+Ca at 1.0 and 2.0 GeVA. The observation of a structure in the mass cross section at about two times the pion mass suggests that pion annihilation is the dominant production mechanism in p+Be above 2 GeV. Comparison of preliminary results from p+Be and Ca+Ca at 1 GeVA is presented.
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metals,elementary particles,spectrometers,nuclear reactions,annihilation,hadrons,leptons,linear momentum,cross section,fermions,charged particles,alkaline earth metals,bosons,elements,measuring instruments,nuclear matter,interactions,pions,pair production,spectra,calcium,mass spectra,mesons,electrons
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