We present a description of an experiment carried out at the 30GeV Alternating Gradient Synchrotron of the Brookhaven National Laboratory. The experiment used a high intensity slow extracted proton beam of between 10
10
and 2 × 10
12
protons per pulse and measured the e
+
e
-
mass spectrum from the reaction p+Be→e
+
e
-
+X. The result of this experiment shows the production of a new type of particle, J, which decays to e
+
e
-
with a width consistent with zero. Experimental searches for more new particles will also be presented.
Delivering high intensity proton beam: lessons for the next beam generations