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impact parameter : ウィキペディア英語版
impact parameter

The impact parameter b is defined as the perpendicular distance between the path of a projectile and the center of the field U(r) created by an object that the projectile is approaching (see diagram). It is often referred to in Nuclear Physics (see Rutherford Scattering), as well as in Classical Mechanics.
The impact parameter is related to the scattering angle \theta by〔Landau LD and Lifshitz EM (1976) ''Mechanics'', 3rd. ed., Pergamon Press. ISBN 0-08-021022-8 (hardcover) and ISBN 0-08-029141-4 (softcover).〕
:\theta=\pi-2b\int_ is its closest distance from the center.
==See also==
Tests of general relativity

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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