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Title: On neutron surface waves

Abstract

It is shown that neutron surface waves do not exist. The difference between the neutron wave mechanics and the wave physics of electromagnetic and acoustic processes, which allows the existence of surface waves, is analyzed.

Authors:
 [1]
  1. Joint Institute for Nuclear Research (Russian Federation)
Publication Date:
OSTI Identifier:
22050866
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 54; Journal Issue: 1; Other Information: Copyright (c) 2009 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACOUSTICS; ELECTROMAGNETISM; MECHANICS; NEUTRONS; WAVE PROPAGATION

Citation Formats

Ignatovich, V. K., E-mail: ignatovi@nf.jinr.ru. On neutron surface waves. United States: N. p., 2009. Web. doi:10.1134/S1063774509010209.
Ignatovich, V. K., E-mail: ignatovi@nf.jinr.ru. On neutron surface waves. United States. doi:10.1134/S1063774509010209.
Ignatovich, V. K., E-mail: ignatovi@nf.jinr.ru. 2009. "On neutron surface waves". United States. doi:10.1134/S1063774509010209.
@article{osti_22050866,
title = {On neutron surface waves},
author = {Ignatovich, V. K., E-mail: ignatovi@nf.jinr.ru},
abstractNote = {It is shown that neutron surface waves do not exist. The difference between the neutron wave mechanics and the wave physics of electromagnetic and acoustic processes, which allows the existence of surface waves, is analyzed.},
doi = {10.1134/S1063774509010209},
journal = {Crystallography Reports},
number = 1,
volume = 54,
place = {United States},
year = 2009,
month = 1
}
  • We have studied the effects of a traveling surface acoustic wave (SAW) disturbance on symmetric Bragg case neutron diffraction from a perfect crystal of lithium niobate. Generally, the reflectivity is increased as the SAW distortion creates an effective moving mosaic crystal in the near surface region. Unlike the corresponding x-ray situation in which the crystalline distortion is effectively stationary, thermal neutron and SAW velocities are comparable. Thus the interaction between the neutron and the coherent SAW phonons involves significant Doppler effects that also modify the reflected neutron intensity. While the observed effects can be explained qualitatively, as yet no quantitativemore » picture exists of the interaction between the neutron and the coherent surface phonons in this situation. {copyright} {ital 1999} {ital The American Physical Society}« less
  • The propagation of magnetostatic waves (MSW's) in layered planar magnetic structures has been studied by many investigators. Much of this interest is geared to achieve technically desired delay characteristics, especially in conjunction with the microwave integrated circuits. Here, this paper presents a study of both magnetostatic surface wave (MSSW) and magnetostatic volume wave (MSVW) propagation in multilayered magnetic thin films with noncollinear magnetizations. YIG/GGG/YIG structure is used, where YIG and GGG are the abbreviations for yttrium iron garnet and gadolinium gallium garnet, respectively. The layered film is in the (110) plane. Due to the existence of both cubic and inducedmore » in-plane uniaxial anisotropy fields in the two YIG films, the two magnetizations ([rvec M][sub 1] and [rvec M][sub 2]) are not aligned with the applied dc field. Since there is an arbitrary angle between [rvec M][sub 1] and [rvec M][sub 2], there is a new configuration to study both MSSW and MSVW propagations. The interested MSVW propagation in the plane formed by [rvec M][sub 1] and [rvec M][sub 2] shows a different dispersion relationship from that in the direction perpendicular to the plane formed by [rvec M][sub 1] and [rvec M][sub 2]. For a given applied dc field normal to the film plane, MSVW is excited in the [rvec M][sub 2] layer, while MSSW is excited in the M[sub 1] layer. The author has found that the angle between the two static magnetizations strongly affects the dispersion relationship. In addition, the effect of the separation between the two magnetic layers on the dispersion and time delay has been studied.« less
  • The Green's function for the slab coronal hole is obtained explicitly. The Fourier integral representation for the radiated field inside and outside the coronal hole waveguide is obtained. The radiated field outside the coronal hole is calculated using the method of steepest descents. It is shown that the radiated field can be written as the sum of two contributions: (1) a contribution from the integral along the steepest descent path and (2) a contribution from all the poles of the integrand between the path of the original integral and the steepest descent path. The free oscillations of the waveguide canmore » be associated with the pole contributions in the steepest descent representation for the Green's function. These pole contributions are essentially generalized surface waves with a maximum amplitude near the interface which separates the plasma inside the coronal hole from the surrounding background corona. The path contribution to the integral is essentially the power radiated in body waves. 21 references.« less