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In particle and atomic physics, a Yukawa potential (also called a screened Coulomb potential) is a potential of the form : where ''g'' is a magnitude scaling constant, i.e. is the amplitude of potential, ''m'' is the mass of the affected particle, ''r'' is the radial distance to the particle, and ''k'' is another scaling constant, which finally the product of ''km'' is the inverse scope. The potential is monotone increasing, implying that the force is always attractive. The Coulomb potential of electromagnetism is an example of a Yukawa potential with e−''kmr'' equal to 1 everywhere; this is taken to mean that the photon mass ''m'' is equal to 0. In interactions between a meson field and a fermion field, the constant ''g'' is equal to the coupling constant between those fields. In the case of the nuclear force, the fermions would be a proton and another proton or a neutron. == History == Hideki Yukawa showed in the 1930s that such a potential arises from the exchange of a massive scalar field such as the field of the pion whose mass is . Since the field mediator is massive the corresponding force has a certain range, which is inversely proportional to the mass. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Yukawa potential」の詳細全文を読む スポンサード リンク
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