Abstract
The relation between the low-energy and high-energy response of nuclei is discussed. Calculations using an extended RPA method (E-RPA) show that present understanding of low-energy nuclear response functions is consistent with recent experimental evidence on the depletion of shell model states below the Fermi energy. This point is further investigated by calculating the momentum distribution and the single-particle and single-hole strength functions in nuclear matter at normal density including short-range correlations. A depletion of 10–15% is obtained for momenta below kF. This missing strength is found as a very smooth distribution extending to very high energy. This implies that an important fraction of the particle-hole strength is not available at low energy. This disappearance of strength at low energy leads to appearance of strength at high energy and momentum transfer.
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