Deep inelastic neutron scattering from liquid sup 4 He

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5605751

Snow, W M

The author performed an extensive series of high-resolution deep in-elastic neutron-scattering measurements on liquid {sup 4}He at a number of high-momentum transfers for several temperatures and densities in both the normal and superfluid phases. The primary goal of these measurements was to obtain information on the momentum distribution of liquid {sup 4}He. The shape of the momentum distribution of liquid {sub 2}He in the superfluid phase is a fundamental interest since, according to our present theoretical understanding of superfluidity in bulk {sub 4}He, a {delta}-function singularity at p = 0 should exist due to the Bose condensate. A secondary goal, motivated by the momentum-distribution studies, was to investigate the nature of the corrections to the Impulse Approximation, called final state effects (FSE), in deep inelastic neutron scattering from liquid {sub 4}He. The observed Compton profiles, whose shape depends on both the underlying momentum distribution and FSE, were analyzed. Results provide strong evidence for a narrow component in the momentum distribution of the superfluid phase corresponding to the Bose condensate.

• Research Organization: Harvard Univ., Cambridge, MA (United States)
• OSTI ID: 5605751
• Country of Publication: United States
• Language: English

Related Subjects

665420* -- Superfluidity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BASIC INTERACTIONS
BOSE-EINSTEIN CONDENSATION
COHERENT SCATTERING
COMPTON EFFECT
DIFFRACTION
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
EVEN-EVEN NUCLEI
FLUIDS
HELIUM 4
HELIUM ISOTOPES
INELASTIC SCATTERING
INTERACTIONS
ISOTOPES
LIGHT NUCLEI
LIQUIDS
MOMENTUM TRANSFER
NEUTRON DIFFRACTION
NUCLEI
SCATTERING
STABLE ISOTOPES
SUPERFLUIDITY