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Ambiguities in the implementation of the impulse approximation for the response of many-fermion systems.

Authors
  • Benhar, O
  • Fabrocini, A
  • Fantoni, S
Type
Published Article
Journal
Physical review letters
Publication Date
Jul 30, 2001
Volume
87
Issue
5
Pages
52501–52501
Identifiers
PMID: 11497763
Source
Medline
License
Unknown

Abstract

Within the impulse approximation, the response of a many-body system at large momentum transfer can be directly related to ground state properties. Although the physics assumptions underlying impulse approximation are well defined, their implementation involves ambiguities that may cause significant differences in the calculated responses. We show that, while minimal use of the impulse approximation assumptions naturally leads to write the response in terms of the spectral function, the alternative definition in terms of the momentum distribution involves a more extended use of the same assumptions.

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