The authors construct, in the static potential approximation, the number operator for excess pions present in nuclei due to the pion-exchange forces between nucleons. Expectation values are calculated with use of variational wave functions obtained from a realistic Hamiltonian. Results are presented for systems ranging from the deuteron to nuclear matter: For example is estimated to have ∼7 extra pions, over and above the pion clouds associated with the individual nucleons.
- Received 27 May 1983
- Published in the issue dated 29 August 1983
© 1983 The American Physical Society