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1Author    R. C. Blasdell, D. M. Ceperley, R. O. SimmonsRequires cookie*
 Title    Neutron and PIMC Determination of the Longitudinal Momentum Distribution of HCP, BCC and Normal Liquid 4 Het  
 Abstract    Deep inelastic neutron scattering has been used to measure the neutron Compton profile (NCP) of a series of condensed 4 He samples at densities from 28.8 atoms/nm 3 (essentially the minimum possible density in the solid phase) up to 39.8 atoms/nm 3 using a chopper spectrometer at the Argonne National Laboratory Intense Pulsed Neutron Source. At the lowest density, the NCP was measured along an isochore through the hep, bcc, and normal liquid phases. Average atomic kinetic energies are extracted from each of the data sets and are compared to both published and new path integral Monte-Carlo (PIMC) calculations as well as other theoretical predictions. In this prelimi-nary analysis of the data, account is taken of the effects of instrumental resolution, multiple scatter-ing, and final-state interactions. Both our measurements and the PIMC theory show that there are only small differences in the kinetic energy and longitudinal momentum distribution of isochoric helium samples, regardless of their phase or crystal structure. 
  Reference    Z. Naturforsch. 48a, 433—437 (1993); received December 27 1991 
  Published    1993 
  Keywords    Momentum distribution, Neutron, Helium 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0433.pdf 
 Identifier    ZNA-1993-48a-0433 
 Volume    48