Brookhaven has finally been allowed to start building RHIC, the relativistic heavy‐ion collider designed to occupy the 4‐km‐circumference tunnel left vacant eight years ago by the cancellation of the Colliding Beam Accelerator project. CBA, née Isabelle, was to have been a 200×200‐GeV proton‐proton collider, but construction never got beyond the civil engineering stage.

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