The DLS collaboration has recently completed a high statistics study o
f dilepton production at the Bevalac. In particular, we have measured
dielectrons (e(+)e(-)) from p-p and p-d collisions to understand the b
asic dilepton production mechanisms in the energy range from 1.05 - 4.
9 GeV. These data can be used to determine the basic processes which c
ontribute to nucleon-nucleon dilepton production such as hadronic brem
sstrahlung, vector meson processes, and hadronic Dalitz decay. The dat
a show that a simple elastic bremsstrahlung calculation is insufficien
t to explain the data. Theoretical models are compared with the data.
A new high statistics study of Ca-Ca at 1.05 A . GeV has been made to
study the collectivity of A-A collisions.