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Title: Light atom quantum oscillations in UC and US

Abstract

High energy vibrational scattering in the binary systems UC and US is measured using time-of-flight inelastic neutron scattering. A clear set of well-defined peaks equally separated in energy is observed in UC, corresponding to harmonic oscillations of the light C atoms in a cage of heavy U atoms. The scattering is much weaker in US and only a few oscillator peaks are visible. We show how the difference between the materials can be understood by considering the neutron scattering lengths and masses of the lighter atoms. Monte Carlo ray tracing is used to simulate the scattering, with near quantitative agreement with the data in UC, and some differences with US. The possibility of observing anharmonicity and anisotropy in the potentials of the light atoms is investigated in UC. Lastly, the observed data is well accounted for by considering each light atom as a single atom isotropic quantum harmonic oscillator.

Authors:
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [2];  [2];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Canadian Nuclear Lab., Chalk River, ON (Canada)
  4. California Institute of Technology (Caltech), Pasadena, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1235830
Alternate Identifier(s):
OSTI ID: 1235638
Grant/Contract Number:  
AC05-00OR22725; FG02-08ER46528
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Yiu, Yuen, Aczel, Adam A., Granroth, Garrett E., Abernathy, Douglas L., Stone, Matthew B., Buyers, W. J. L., Lin, J. Y. Y., Samolyuk, German D., Stocks, George Malcolm, and Nagler, Stephen E.. Light atom quantum oscillations in UC and US. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.014306.
Yiu, Yuen, Aczel, Adam A., Granroth, Garrett E., Abernathy, Douglas L., Stone, Matthew B., Buyers, W. J. L., Lin, J. Y. Y., Samolyuk, German D., Stocks, George Malcolm, & Nagler, Stephen E.. Light atom quantum oscillations in UC and US. United States. doi:10.1103/PhysRevB.93.014306.
Yiu, Yuen, Aczel, Adam A., Granroth, Garrett E., Abernathy, Douglas L., Stone, Matthew B., Buyers, W. J. L., Lin, J. Y. Y., Samolyuk, German D., Stocks, George Malcolm, and Nagler, Stephen E.. Tue . "Light atom quantum oscillations in UC and US". United States. doi:10.1103/PhysRevB.93.014306. https://www.osti.gov/servlets/purl/1235830.
@article{osti_1235830,
title = {Light atom quantum oscillations in UC and US},
author = {Yiu, Yuen and Aczel, Adam A. and Granroth, Garrett E. and Abernathy, Douglas L. and Stone, Matthew B. and Buyers, W. J. L. and Lin, J. Y. Y. and Samolyuk, German D. and Stocks, George Malcolm and Nagler, Stephen E.},
abstractNote = {High energy vibrational scattering in the binary systems UC and US is measured using time-of-flight inelastic neutron scattering. A clear set of well-defined peaks equally separated in energy is observed in UC, corresponding to harmonic oscillations of the light C atoms in a cage of heavy U atoms. The scattering is much weaker in US and only a few oscillator peaks are visible. We show how the difference between the materials can be understood by considering the neutron scattering lengths and masses of the lighter atoms. Monte Carlo ray tracing is used to simulate the scattering, with near quantitative agreement with the data in UC, and some differences with US. The possibility of observing anharmonicity and anisotropy in the potentials of the light atoms is investigated in UC. Lastly, the observed data is well accounted for by considering each light atom as a single atom isotropic quantum harmonic oscillator.},
doi = {10.1103/PhysRevB.93.014306},
journal = {Physical Review B},
number = 1,
volume = 93,
place = {United States},
year = {2016},
month = {1}
}

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