Higher-order corrections to collective particle-hole excitations using green function techniques

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18 Scopus citations


Using Green function techniques, we determine higher-order corrections to the Tamm-Dancoff and Random Phase Approximation equations. In particular, we find that the second-order corrections to the Tamm-Dancoff equations consist of a t-matrix term and a core-polarization term. If we truncate our configuration space, we obtain an additional second-order correction from the particle-hole ladder term. We carry out numerical calculations of these second-order corrections for the negative-parity excited states of 4He using the Tabakin separable potential.

Original languageEnglish (US)
Pages (from-to)129-145
Number of pages17
JournalNuclear Physics, Section A
Issue number1
StatePublished - Feb 19 1968


ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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