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.
This research was supported in part by NSF Grant No. DMR-8519077 which also provided access to the Cray X-MP of the Pittsburgh Supercomputing Center and by NATO under Grant No. RG.85/0684 and by the Foundation for Fundamental Research of Matter (FOM) with support from the Netherlands’ Organization for advancement of Pure Research.
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Dickhoff, W.H., Brand, M.G.E., Allaart, K., Ramos, A., Polls, A. (1989). Single-Particle Strength and Nuclear Response Functions. In: Silver, R.N., Sokol, P.E. (eds) Momentum Distributions. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2554-1_26
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DOI: https://doi.org/10.1007/978-1-4899-2554-1_26
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