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The method of point transformations is used to obtain a microscopically based theory of the excitations of a system of interacting bosons. The theory is governed by a transformed Hamiltonian whose ground state is a noninteracting state and which is quadratic in the new momenta. The form of Hamiltonian is compatible with translational, rotational, and Galilean invariance. If the assumption is made that two body interactions between the dressed particles predominate, two well-behaved functions remain undetermined. In the absence of a microscopic calculation these functions may be fitted using experimental data for liquid helium. The thermal properties of the system can be calculated as with the less rigorously based Landau-Khalatnikov
Hamiltonian. The present theory retains the possibility of describing the Bose-Einstein condensation and quantized circulation.
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The resonance structure observed in the "Y(n, n)\*@Y total cross section measurements in the range of 0.3-1.2 MeV incident energy was investigated using the generalized R-matrix theory of nuclear reactions and the doorway interpretation of intermediate structure. The energies and wavefunctions of th
The possibility of ambiguities in the regulator procedure used in the calculation of the rxdiat ivc corrections to muon decay is discussed. It is pointed out that t.here is a particular gauge, namely the "Landau gauge, " in which all the int.egrals are finit.e without, regul:rriz:?tion and which ob