University:
Princeton University
Course:
PHY 103 | General Physics I
Academic year:

2023
Views:

402

Pages:

3
Author:

abdulsalam23745

# Salient features of Nuclear forces 1. Nuclear forces are the strongest forces existing in nature. Force Relative strength |- Nuclear strong 10 13 Nudear Weak 10-2 E-M Force Gravitational Force -39 10 2. Nuclear Force has short range = fetod fewfm (2-3fm 3. Nuclear Forces are spin dependent. 4. Nuclear Forces are attractive in naty but with repulsive core. ← → Repulsion 0-8fm. attract No force 5. Nuclear Force are non-central ce. Nuclear forces gre tensor forces. Nuclear Forces depends on velocity of nucleons as well as orientation of Spins of nucleons. 6. Nuclear Forces are charge independent Thus F (n-n) F (n-p) = F (p-p) 7. Nuclear Forces have isotopic invariance (related to Isospin which is conserved in strong Interaction & is equal for n and p) and acts such that no. of n and p remains Same) 8. N.F. are exchange in nature. (a) Wigner exchange No exchange (b) Majorana exchange space exchange. (۲) Bartlett exchange→ spin exchange (1) Heisenberg exchang, e spin-space exchanges 9. Nuclear force poses the property of Saturation. It is Combined effect of short range, repulsive Core and exchange nature. Experimental fact: B.E per nucleen almost Constant 8 MeV 10. N.F. acts only upon hadron [meson.and baryons (mucleons and hyperone)] N.F. do not act on leptons ege 11. N.F Occurs by exchange of mesons eg. It meson; o meson, wmeson (Omega) I Tho meson (5) UP. and dewn Quarky proton neutron. Strong nuclear force b/w nucleon, inside nucleus 18 Called residual Storvrugtener The strongest nuclear force s force which act b/w quarks. It is so strong that we cannot break pand in into quarka