Nuclear force

4th fundamental force

1. NUCLEAR FORCE SUBMITTED TO: Dr. K. Dhoot and Mr. Giriraj Chayal SUBMITTED BY: Vishal Kumar Jangid M.Sc Final (Physics)-2017

2. Gravitational force Electromagnetic force Nuclear force Weak force FUNDAMENTAL FORCE

3. Before 1930, neutron haven’t discovered yet. There is dilemma of how p-p reside inside the nucleus. In 1932, James Chadwick discover neutron. After that nuclear force came into existence. Definition: a strong attractive force between nucleons in the atomic nucleus that holds the nucleus together. NUCLEAR FORCE

4. Charge independent. Very strong in nature. Short range force. Repulsive at vey short distance(~0.5 fm ). Saturated. Non central. Spin and angular momentum dependent. Velocity dependent. Exchange force. Properties of nuclear force

5. When the two nucleon are interacting then there is field associated with it and cause of field is that the nucleon are exchanging the quantum between them. The exchange quanta is П meson. In p-n interaction YUKAWA THEORY p n ∏ + ∏ + n p

6. In n-p interaction In p- p/n -n interaction n p ∏ - ∏ - p n p P’ ∏ ∏ p p’

7. Why pions are emitted ?? Using uncertainty principal

8. Q: Pick up wrong statement (GATE-2009) (a) the nuclear force is independent of electric charge. (b)the Yukawa potential is proportional to where r is the separation between two nucleon. (c)the range of nuclear force is of the order of 10 -18 -10 -19 m. (d) the nucleon interact among each other by the exchange of meson. POP QUIZ

9. THANK YOU