Neutron Diffraction by Gases

Alcock, Norman; Hurst, D. G.

doi:10.1103/physrev.75.1609.2

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…The blue hatched area shows the simulation Experimental data of X distribution (black dot) and simulations of incident neutrons (top red hatch) and scattered neutrons (bottom blue hatch). of the scattered neutrons, where the scattering distribution was calculated with the semiclassical model [48,49]. Both simulations were scaled to the experimental data; the simulation for the scattered neutrons was normalized in the region of |X| > 54 mm, and the simulation for the incident neutrons was scaled so as to reproduce the experimental data together with the contribution of the scattered neutrons in the region of |X| ≤ 54 mm.…”

Section: Procedures (A): Separation By Maximum Pulse Heightmentioning

confidence: 99%

Neutron lifetime measurement with pulsed cold neutrons

Hirota,

Ichikawa,

Ieki

et al. 2020

Preprint

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The neutron lifetime has been measured by comparing the decay rate with the reaction rate of 3 He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator Research Complex (J-PARC). The decay rate and the reaction rate were determined by simultaneously detecting electrons from the neutron decay and protons from the 3 He(n,p) 3 H reaction using a gas chamber of which working gas contains diluted 3 He. The measured neutron lifetime was 898 ± 10 stat +15 −18 sys s.

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Section: Procedures (A): Separation By Maximum Pulse Heightmentioning

confidence: 99%

Neutron lifetime measurement with pulsed cold neutrons

Hirota,

Ichikawa,

Ieki

et al. 2020

Preprint

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“…The first paper describing research on the scattering of neutrons [7] described diffractometer measurements of pressurized O 2 and CO 2 with 70 meV (1.06 Å) neutrons selected by a NaCl monochromator from the thermal spectrum at NRX. The experiment was designed to elucidate the atomic structure of the molecules, and the measurements were compared with calculations based on the scattering of the neutron by systems of two-and three-point molecules assuming no inelastic scattering.…”

Section: The Early Period 1949-1951 21 Structure Of Fluids and Solidsmentioning

confidence: 99%

The First Two Decades of Neutron Scattering at the Chalk River Laboratories

Holden

2021

QuBS

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The early advances in neutron scattering at the Chalk River Laboratories of Atomic Energy of Canada are recorded. From initial nuclear physics measurements at the National Research Experimental (NRX) reactor came the realization that, with the flux available and improvements in monochromator technology, direct measurements of the normal modes of vibrations of solids and the structure and dynamics of liquids would be feasible. With further flux increases at the National Research Universal (NRU) reactor, the development of the triple-axis crystal spectrometer, and the invention of the constant-Q technique, the fields of lattice dynamics and magnetism and their interpretation in terms of the long-range forces between atoms and exchange interactions between spins took a major step forward. Experiments were performed over a seven-year period on simple metals such as potassium, complex metals such as lead, transition metals, semiconductors, and alkali halides. These were analyzed in terms of the atomic forces and demonstrated the long-range nature of the forces. The first measurements of spin wave excitations, in magnetite and in the 3D metal alloy CoFe, also came in this period. The first numerical estimates of the superfluid fraction of liquid helium II came from extensive measurements of the phonon–roton and multiphonon parts of the inelastic scattering. After the first two decades, neutron experiments continued at Chalk River until the shut-down of the NRU reactor in 2018 and the disbanding of the neutron effort in 2019, seventy years after the first experiments.

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Slow neutron scattering by molecules of liquid methane

Rogalska

1963

Physica

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Neutron Diffraction by Gases

Cited by 11 publications

References 4 publications

Neutron lifetime measurement with pulsed cold neutrons

Neutron lifetime measurement with pulsed cold neutrons

The First Two Decades of Neutron Scattering at the Chalk River Laboratories

Slow neutron scattering by molecules of liquid methane

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