Not Alphamagnetic Spectrometer.
A unit of area. A barn is 10−28 m2 (100 fm2), about the cross-sectional area of a uranium nucleus.
A barn expresses the cross section of any scattering process, which relates to the probability of interaction between small particles.
A cyclotron is an apparatus in which charged atomic and subatomic particles are accelerated by an alternating electric field while following an outward spiral or circular path in a magnetic field.
Perhaps the most important improvement has been the replacement of an electrical magnet with a series of permanent magnets to generate the cyclotron's magnetic field.
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