Studies on the Role of Pion Degrees of Freedom in Nuclear interactions
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Date
2001-06
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Addis Ababa University
Abstract
In t.his t.hesis, we work out. t.he low-energy (~300Me V) form of t.he protonproton
(p-p), neutron-neutron (n-n), and proton-neutron (p-n) int.eraction potentials
taking the field-theoretic view that these interactions are mediated through
the exchange of 7r
0
, 7r± mesons. In this process we reproduce the exact form of
Yukawa potential. vVe extend these calculations to obtain an approximate form of
two-pion exchange potential. vVe then generalize t.he formalism to include isospin
and arrive at the correct form of the low-energy nucleon-nucleon (N-N) potential.
In the process we establish the charge independent hypothesis of nuclear forces.
Further we observe that our model for the long-range part of N-N forces correctly
predicts that for I = 0, the two nucleon system exists as a bound state (deuteron
nucleus) while for I = 1, it exists as scattering states
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Keywords
Freedom in Nuclear interactions