Measurement of dielectron production in niobium-niobium collisions at 1.05 GeV/nucleon

Abstract

A dielectron signal for pair masses greater than ${\mathit{M}}_{\mathrm{\ensuremath{\pi}}}$ is observed in Nb+Nb collisions at 1.05 GeV/nucleon beam kinetic energy. The invariant mass spectrum and the associated multiplicity distribution are presented. Comparisons are made with previous cross section measurements in p+Be and Ca+Ca.