The spectral function of He-4 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 quasielastic longitudinal (e,e') response R-L Of 4He for q = 300, 400, and 500 MeV/c. Comparison with the exact R-L shows a rather sizable disagreement except in the quasielastic 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 almost the same results for R-L as the exact spectral function.

Exact 4 He spectral function in a semirealistic NN potential model

Efros, Victor;Leidemann, Winfried;Orlandini, Giuseppina
1998

Abstract

The spectral function of He-4 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 quasielastic longitudinal (e,e') response R-L Of 4He for q = 300, 400, and 500 MeV/c. Comparison with the exact R-L shows a rather sizable disagreement except in the quasielastic 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 almost the same results for R-L as the exact spectral function.
Efros, Victor; Leidemann, Winfried; Orlandini, Giuseppina
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/73181
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