Abstract The energy levels, En. of pions in multiparticle systems have been calculated by using the probability distribution, P(n,k), of the independent-creation model of multi-fire balls and the density matrix method of quantum statistics. The result, En = E0 +nkBTln( 1+1/n )-kBTln x Γ(n+k) /Γ(k) Γ(n+1), shows that the nonlinear interaction depends on k. and it can take place only between different fire-balls.
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Published: 01 March 1988
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