Spectral Function in a Semirealistic NN Potential Model
نویسندگان
چکیده
The spectral function of 4He is calculated with the Lorentz integral transform method in a large energy and momentum range. The excitation spectrum of the residual 3N–system is fully taken into account. The obtained spectral function is used to calculate the quasi elastic longitudinal (e, e) response RL of 4He for q = 300, 400, and 500 MeV/c. Comparison with the exact RL shows a rather sizeable disagreement except in the quasi elastic peak, where the differences reduce to about 10% at q=500 MeV/c. It is shown as well that very simple momentum distribution approximations for the spectral function provide practically the same results for RL as the exact spectral function. PACS numbers: 25.30.Fj, 21.45.+v, 21.10.Jx, 27.10.+h Typeset using REVTEX
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