Copper collisions gives more strangeness than gold

"Colliding pairs of copper ions produce significantly more strange quarks per nucleon than pairs of much larger gold atoms. That is the surprising discovery of physicists working on the Relativistic Heavy Ion Collider (RHIC) at the Brookhaven National Laboratory in the US. The finding gives further backing to the core–corona model of such high-energy collisions and could shed further light on the quark–gluon plasma – a state of matter though to have been present in the very early universe."

in PhysicsWorld