The RHICf experiment
RHICf is an collider experiment measuring very forward productions of neutral particles at Relativistic Heavy Ion Collider (RHIC) located in Brookhaven National Laboratory, USA. At proton-proton collisions, produced energetic particles, photons, neutrons and π0s, are emitted into extremely low angles of collisions, and they are measured by a RHICf calorimeter detector located at 18 m from the collision point. Their results will provide essential data to test hadronic interaction models used in Monte Carlo simulations of air-showers induced by very-high energy cosmic-rays. Another physics target is to measure transverse spin asymmetry in the very forward neutron and π0 productions at polarized proton-proton collisions.
Un-expectively large asymmetry of forward neutral pion production at polarized proton-proton collisions was reported by RHICf. The result was published on Physical Review Letters.
An RHICf operation with proton-proton collisions at the center-of-mass collisions energy of 510 GeV have succesfully completed in June 2017.