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Why protons do not repel eachother in the nucleus of an atom ?
Nuclear forceThe nuclear force (or nucleon–nucleon interaction orresidual strong force) is the force between two or morenucleons. It is responsible for binding of protons andneutrons into atomic nuclei.
Nuclear force-distancesThe force is powerfully attractive between nucleons at distances of about 1 femtometer (fm) between their centersIt rapidly decreases to insignificance at distances beyond about 2.5 fm.At very short distances less than 0.7 fm, it becomes repulsive.
The model above shows a proton and neutron with overlapping pion fields,allowing the proton to donate a pion to the neutron, contributing to thenuclear force holding the two nucleons together.
Nuclear Core structure The core of the nucleon which is surrounded by the pion cloud consists of particles called quarks. Quarks come in different types. The proton and neutron are composed of three quarks of two different types.The proton is composed of two up-quarks and one down-quark and so can be written: uud.The neutron is composed of one up-quark and two down-quarks and so can be written udd.
Interaction of nucleons mediated by pion-quark constituents.