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Full-Text Articles in Physics
Quasielastic Scattering In The Interaction Of Ultracold Neutrons With A Liquid Wall And Application In A Reanalysis Of The Mambo I Neutron-Lifetime Experiment, Albert Steyerl, J. M. Pendlebury, Charles Kaufman, Surendra S. Malik, A. M. Desai
Quasielastic Scattering In The Interaction Of Ultracold Neutrons With A Liquid Wall And Application In A Reanalysis Of The Mambo I Neutron-Lifetime Experiment, Albert Steyerl, J. M. Pendlebury, Charles Kaufman, Surendra S. Malik, A. M. Desai
Physics Faculty Publications
We develop a theory of ultracold and very cold neutron scattering on viscoelastic surface waves up to second-order perturbation theory. The results are applied to reanalyze the 1989 neutron-lifetime experiment using ultracold neutron storage in a Fomblin-coated vessel by Mampe et al. [Phys. Rev. Lett. 63, 593 (1989)]. Inclusion of this theory of the quasielastic scattering process in the data analysis shifts the neutron lifetime value from 887.6 ± 3 to 882.5 ± 2.1 s.
Surface Roughness Effect On Ultracold Neutron Interaction With A Wall And Implications For Computer Simulations, Albert Steyerl, Surendra S. Malik, A. M. Desai, Charles Kaufman
Surface Roughness Effect On Ultracold Neutron Interaction With A Wall And Implications For Computer Simulations, Albert Steyerl, Surendra S. Malik, A. M. Desai, Charles Kaufman
Physics Faculty Publications
We review the diffuse scattering and the loss coefficient in ultracold neutron reflection from slightly rough surfaces, report a surprising reduction in loss coefficient due to roughness, and discuss the possibility of transition from quantum treatment to ray optics. The results are used in a computer simulation of neutron storage in a recent neutron lifetime experiment that reported a large discrepancy of neutron lifetime with the current particle data value. Our partial reanalysis suggests the possibility of systematic effects that were not included in this publication.
Algorithm For The Analysis Of Tryptophan Flourescence Spectra And Their Correlation With Protein Structural Parameters, John Hixon, Yana K. Reshetnyak
Algorithm For The Analysis Of Tryptophan Flourescence Spectra And Their Correlation With Protein Structural Parameters, John Hixon, Yana K. Reshetnyak
Physics Faculty Publications
The fluorescence properties of tryptophan residues are sensitive to the microenvironment of fluorophores in proteins. Therefore, fluorescence characteristics are widely used to study structural transitions in proteins. However, the decoding of the structural information from spectroscopic data is challenging. Here we present a review of approaches developed for the decomposition of multi-component protein tryptophan fluorescence spectra and correlation of these spectral parameters with protein structural properties.
Accurate Analysis Of Tumor Margins Using A Fluorescent Ph Low Insertion Peptide (Phlip), James Segala, Donald M. Engelman, Yana K. Reshetnyak, Oleg A. Andreev
Accurate Analysis Of Tumor Margins Using A Fluorescent Ph Low Insertion Peptide (Phlip), James Segala, Donald M. Engelman, Yana K. Reshetnyak, Oleg A. Andreev
Physics Faculty Publications
The recurrence of certain cancers remains quite high due to either incomplete surgical removal of the primary tumor or the presence of small metastases that are invisible to the surgeon. Near infrared (NIR) fluorescence imaging might improve surgical outcomes by providing sensitive, specific, and real-time visualization of normal and diseased tissues if agents can be found that discriminate between normal and diseased tissue and define tumor margins. We have developed a new approach for revealing tumor borders by using NIR fluorescently labeled pH Low Insertion Peptide (pHLIP) and have created a computational program for the quantitative assessment of tumor boundaries. …
Summary Of The Workshop On The Applications Of X-Ray Standing Waves In Studies Of Surfaces, Fiims, And Buik Materiais, David R. Heskett, L. Berman
Summary Of The Workshop On The Applications Of X-Ray Standing Waves In Studies Of Surfaces, Fiims, And Buik Materiais, David R. Heskett, L. Berman
Physics Faculty Publications
Highlights of the satellite workshop on the technique of x-ray standing waves which preceded the 5th International Conference on Synchrotron Radiation Instrumentation held at the State University of New York at Stony Brook, USA are presented. At the workshop, many applications of the x-ray standing-wave technique were described in both invited and contributed talks. While the predominant use of the XSW technique was to analyze the structure of adsorbates on surfaces, applications in the characterization of thin films, interfaces, clean surfaces, and bulk materials were also presented. Most of the talks concentrated on experimental results, but some theory was also …