Nuclear force 22.10.12

Why protons don't repel one another in nucleus

1. Nagarjuna Agrichem Limited
India
The pride of the Indian Farmer

2. Why protons do not repel each
other in the nucleus of an atom ?

3. Nuclear force
The nuclear force (or nucleon–nucleon interaction or
residual strong force) is the force between two or more
nucleons. It is responsible for binding of protons and
neutrons into atomic nuclei.

4. The force is powerfully attractive
between nucleons at distances of about
1 femtometer (fm) between their centers
It rapidly decreases to insignificance at
distances beyond about 2.5 fm.
At very short distances less than 0.7 fm,
it becomes repulsive.
Nuclear force-distances

5. Interaction of nucleons through pion.

6. The model above shows a proton and neutron with overlapping pion fields,
allowing the proton to donate a pion to the neutron, contributing to the
nuclear force holding the two nucleons together.

7.  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.
Nuclear Core structure

8. Interaction of nucleons mediated by
pion-quark constituents.