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Titolo:
DEEP-INELASTIC RESPONSE OF LIQUID-HELIUM
Autore:
MORONI S; FANTONI S; FABROCINI A;
Indirizzi:
ABDUS SALAM INT CTR THEORET PHYS,STR COSTIERA 11 I-34014 TRIESTE ITALY SCUOLA INT SUPER STUDI AVANZATI I-34014 TRIESTE ITALY UNIV PISA,DIPARTIMENTO FIS I-56126 PISA ITALY
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 17, volume: 58, anno: 1998,
pagine: 11607 - 11612
SICI:
0163-1829(1998)58:17<11607:DROL>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUASI-ELASTIC RESPONSE; MONTE-CARLO; CONDENSATE FRACTION; NEUTRON-SCATTERING; NUCLEAR-MATTER; MIXTURES; HE-4;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
S. Moroni et al., "DEEP-INELASTIC RESPONSE OF LIQUID-HELIUM", Physical review. B, Condensed matter, 58(17), 1998, pp. 11607-11612

Abstract

We calculate the deep-inelastic response of superfluid He-4 and normal He-3. Following the Monte Carlo scheme of Carraro and Koonin, we represent the final-state effects by sampling the one-dimensional scattering wave function of the recoiling atom in a static background. We perform diffusion Monte Carlo simulations, using optimized trial functions and adopting the fixed node approximation for He-3. For He-4 the agreement with recent high-precision measurements is excellent, whereas in the case of He-3 a small but not negligible discrepancy with available experimental information exists. Possible biases in the calculationare discussed, but the question remains open. This is not the first instance where some inconsistency is found between theoretical calculations and the analysis of neutron-scattering data for He-3. We have also considered two very different fermion wave functions, yielding either a discontinuous or a continuous momentum distribution. They give hardly distinguishable results for the response, ruling out the possibility of detecting the discontinuity by deep-inelastic neutron scatteringat the present level of experimental accuracy. [S0163-1829(98)08038-2].

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Documento generato il 04/12/20 alle ore 12:56:10