Spectrometers are devices for the precise measurement of energies or masses of the products of nuclear reactions. Working similarly to prisms in light optics, particles of higher energy or mass are deflected less in magnetic fields, and thus precise measurements of positions allow precise determinations of energies. To the right are CEBAF's Electron and Hadron spectrometers in Hall A of the three experimental halls.
The S800 Spectrometer at Michigan State Universities National Superconducting Cyclotron Laboratory offers a unique combination of high resolution and large acceptance, the ability to collect as many of the reaction products as possible. It is used for nuclear physics experiments involving a wide variety of combinations of beams and targets in the range around 100 - 200 MeV per nucleon. 

For particularly rare reactions it is important to capture as many as possible of the reaction products that are generated. The Large Acceptance Spectrometer in Hall B of Jefferson Laboratory is specialized for this task.

Some reaction products are so short lived that it is essential to analyze them quickly enough before they can decay. The Short Orbit Spectrometer in Hall C of Jefferson Lab, shown here together  with the High Momentum Spectrometer, is specialized for this task.