impact parameter

noun (in nuclear physics)
the perpendicular distance from the original center of a set of scattering particles to the original line of motion of a particle being scattered.
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Trivial geometric ambiguities such as impact parameter choice must be avoided.
If they approach within an impact parameter of another particle then both particles are given a random displacement.
The values of each impact parameter on the inventory table were multiplied by the values of equivalency factor correspondents.
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