Final-state effects on superfluid {sup {bold 4}}He in the deep inelastic regime

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.5661· OSTI ID:279092

Mazzanti, F ^[1]; Boronat, J ^[2]; Polls, A ^[1]

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1. Departament dEstructura i Constituents de la Materia, Diagonal 645, Universitat de Barcelona, E-08028 Barcelona (Spain)
2. Departament de Fisica i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politecnica de Catalunya, E-08028 Barcelona (Spain)

A study of final-state effects (FSE) on the dynamic structure function of superfluid {sup 4}He in the Gersch-Rodriguez formalism is presented. The main ingredients needed in the calculation are the momentum distribution and the semidiagonal two-body density matrix. The influence of these ground-state quantities on the FSE is analyzed. A variational form of {rho}{sub 2} is used, even though simpler forms turn out to give accurate results if properly chosen. Comparison to the experimental response at high momentum transfer is performed. The predicted response is quite sensitive to slight variations on the value of the condensate fraction, the best agreement with experiment being obtained with {ital n}{sub 0}=0.082. Sum rules of the FSE broadening function are also derived and commented. Finally, it is shown that Gersch-Rodriguez theory produces results as accurate as those coming from other more recent FSE theories. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279092
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CORRELATED-PARTICLE MODELS
DENSITY MATRIX
HELIUM 4
NEUTRON DIFFRACTION
STRUCTURAL CHEMICAL ANALYSIS
SUPERFLUIDITY