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Search Publications by: Charles F. Majkrzak (Fed)

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Displaying 1 - 25 of 50

Pre-Conceptual Design of the NIST Neutron Source

April 16, 2023
Author(s)
Dagistan Sahin, Osman Celikten, Jeremy C. Cook, Abdullah Weiss, Thomas H. Newton, David Diamond, Charles Majkrzak, Hubert King, Joy Shen, Anil Gurgen, Lap-Yan Cheng, Peter Kohut, Cihang Lu, Athi Varuttamaseni
The National Bureau of Standards Reactor (NBSR), a 20 MW thermal power Material Test Reactor (MTR), is located at the NIST Center for Neutron Research (NCNR), providing a safe and reliable neutron source for the thousands of visiting U.S. and international

The Effect of Transverse Wavefront Width on Specular Neutron Reflection

August 1, 2022
Author(s)
Charles Majkrzak, Norman F. Berk, Brian B. Maranville, Joseph Dura, Terrence J. Jach
In the analysis of neutron scattering measurements of condensed matter structure, it normally suffices to treat the incident and scattered neutron beams as if composed of incoherent distributions of plane waves with wavevectors of different magnitudes and

Low-Background Neutron Reflectometry from Solid/Liquid Interfaces

February 1, 2022
Author(s)
David Hoogerheide, Joseph Dura, Brian B. Maranville, Charles F. Majkrzak
Liquid cells are an increasingly common sample environment for neutron reflectometry experiments and are critical for measuring the properties of materials at solid/liquid interfaces. Background scattering determines the maximum useful scattering vector

Magnetic depth profiling Co/Cu multilayers to investigate magnetoresistance

October 12, 2021
Author(s)
John Unguris, D. Tulchinsky, Michael H. Kelley, Julie Borchers, Joseph Dura, Charles Majkrzak, S. Y. Hsu, R. Loloee, W. P. Pratt, J. Bass
The magnetic microstructure responsible for the metastable high resistance state of weakly coupled, as-prepared [Co(6nm)/Cu(6nm)]20 multilayers was analyzed using polarized neutron reflectivity and scanning electron microscopy with polarization analysis

Real-Time Signal Processing for Mitigating SiPM Dark Noise Effects in a Scintillating Neutron Detector

July 19, 2021
Author(s)
Kevin N. Pritchard, Jean Philippe Chabot, R. Robucci, F. S. Choa, A. Osovizky, Jeffrey B. Ziegler, Louis E. Binkley, Peter Tsai, Nancy Hadad, M. Jackson, C. Hurlbut, George M. Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
A 6LiF:ZnS(Ag) based cold neutron detector with wavelength shifting (WLS) fibers and SiPM photodetector was developed at the NIST Center for Neutron Research. For neutron scattering applications at the NCNR, detector false positives severely diminish the

A Large Beam High Efficiency Radio Frequency Neutron Spin Flipper

June 21, 2021
Author(s)
Wangchun Chen, Ross W. Erwin, Peter Tsai, Md. T. Hassan, Nancy Hadad, Charles F. Majkrzak
A design for a radio-frequency (RF) neutron spin flipper obtained from magneto-static and neutron spin transport simulations is presented. The RF flipper constructed from this design provides a flipping probability of 0.999 or better for a beam size 6 cm

Measuring Deadtime and Double-Counts in a Non-Paralyzable Scintillating Neutron Detector using Arrival Time Statistics

June 11, 2021
Author(s)
Kevin N. Pritchard, Jean Philippe Chabot, Peter Tsai, R. Roubucci, F. S. Choa, A. Osovizky, Jeffrey B. Ziegler, Louis E. Binkley, Nancy Hadad, M. Jackson, C. Hurlbut, George M. Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
A 6LiF:ZnS(Ag) based cold neutron detector with wavelength shifting (WLS) fibers and SiPM photodetector was developed at the NIST Center for Neutron Research for the CANDoR instrument (Chromatic Analysis Neutron Diffractometer or Reflectometer). The

Cold Neutron Radiation Does Effects on a 6 LiF:ZnS(Ag) Neutron Detector with Wavelenght Shifting Fibers and SiPM Photodectector

April 21, 2021
Author(s)
Kevin NMN Pritchard, Daniel S. Hussey, A. Osovizky, Jeffrey B Ziegler, Louis Edward Binkley, Peter Tsai, Nancy Hadad, M. Jackson, C. Hurlbut, George M Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
A 6LiF:ZnS(Ag) based cold neutron detector with wavelength shifting (WLS) fibers and SiPM photodetector was developed at the NIST Center for Neutron Research for the CANDoR instrument (Chromatic Analysis Neutron Diffractometer or Reflectometer). To predict

6 LiF:ZnS(Ag) Neutron Detector Performance Optimized using Waveform Recordings and ROC Curves

January 1, 2020
Author(s)
Kevin N. Pritchard, A. Osovizky, Jeffrey B. Ziegler, Louis E. Binkley, Peter NMN Tsai, Nancy Hadad, M. Jackson, C. Hurlbut, George M. Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
We used data analysis and pattern recognition techniques to optimize the neutron sensitivity and selectivity of an ultrathin 6LiF:ZnS(Ag) scintillator based neutron detector paired with a Silicon Photomultiplier (SiPM). We recorded waveforms from the

Nuclear Spin Incoherent Neutron Scattering from Quantum Well Resonators

July 1, 2019
Author(s)
Max Wolff, Anton Devishvili, Joseph Dura, Franz A. Adlmann, Brian Kitchen, Gunnar K. Palsson, Heikki Palonen, Brian B. Maranville, Charles Majkrzak, Boris P. Toperverg
We report the detection and quantification of nuclear spin incoherent scattering from hydrogen occupying interstitial sites in a thin film of vanadium. The neutron wave field is enhanced in a quantum resonator with magnetically switchable iron boundaries

Structural Investigations of Membrane-Associated Proteins by Neutron Reflectometry

July 1, 2019
Author(s)
Rebecca Eells, David Hoogerheide, Paul A. Kienzle, Mathias Loesche, Charles Majkrzak, Frank Heinrich
Neutron reflectometry is a powerful technique for probing the structure of lipid bilayer membranes and membrane-associated proteins. Measurements of the specular neutron reflectivity as a function of momentum transfer can be performed in aqueous

Optimization of Reflectometry Experiments using Information Theory

February 1, 2019
Author(s)
Bradley W. Treece, Paul A. Kienzle, David Hoogerheide, Charles Majkrzak, Mathias Loesche, Frank Heinrich
A method based on Bayesian statistics and information theory is developed to analyze the information gain Δ}H of surface-sensitive reflectometry experiments. After presenting the underlying mathematical framework and its implementation, the method is

An Energy Analyzing Detector for Cold Neutrons

November 1, 2018
Author(s)
Nicholas C. Maliszewskyj, A. Osovizky, Kevin Pritchard, Y. Yehuda-Zada, Louis E. Binkley, Jeffrey B. Ziegler, Peter Tsai, Nancy J. Hadad, George M. Baltic, M. Jackson, C. Hurlbut, Charles F. Majkrzak

Phase-Sensitive Small-Angle Neutron Scattering Experiment

September 19, 2018
Author(s)
Erik Brok, Kathryn L. Krycka, Erika C. Vreeland, Andrew Gomez, Dale L. Huber, Charles Majkrzak
Small angle neutron scattering is a useful technique for determining the structure of biomolecules in solution. However, because of the well-known problem that the phase of the scattered wave is lost in scattering experiments, unambiguous structural

Design of an Ultrathin Cold Neutron Detector

June 11, 2018
Author(s)
A. Osovizky, Kevin N. Pritchard, Y. Yehuda-Zada, Jeffrey B. Ziegler, Louis E. Binkley, Peter NMN Tsai, Alan Keith Thompson, Nancy Hadad, George M. Baltic, M. Jackson, C. Hurlbut, Charles Majkrzak, Nicholas C. Maliszewskyj
WE describe the designs, fabrication, and performance of an energy analyzing detector package for cold neutron spectrometers at the NIST Center for Neutron Research. The detector package consists of arrays of highly oriented pyrolytic graphite crystals set

Design of an Ultrathin Cold Neutron Detector

June 11, 2018
Author(s)
A. Osovizky, Kevin N. Pritchard, Y. Yehuda-Zada, Jeffrey B. Ziegler, Louis E. Binkley, Peter NMN Tsai, Alan Keith Thompson, Nancy Hadad, M. Jackson, C. Hurlbut, George M. Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
We describe the design and performance of an ultrathin (

Optimization of 6 LiF:ZnS(Ag) Scintillator Light Yield using GEANT4

June 1, 2018
Author(s)
Y. Yehuda-Zada, Kevin N. Pritchard, Jeffrey B. Ziegler, P. Yvonne Barnes, Kerry Siebein, M. Jackson, C. Hurlbut, Y. Kadmon, Y. Cohen, R. M. Ibberson, Charles Majkrzak, Nicholas C. Maliszewskyj, I. Orion, A. Osovizky
A new cold neutron detector has been developed at the NCNR for the CANDoR project. Geometric and performance constraints dictate that this detector be exceptionally thin (2nm). For this reason, the design of the detector consists of 6LiF:ZnS(Ag)

Selection of Silicon Photomultipliers for a 6 LiF:ZnS(Ag) Scintillator Based Cold Neutron Detector

April 8, 2018
Author(s)
A. Osovizky, Kevin N. Pritchard, Y. Yehuda-Zada, Jeffrey B. Ziegler, Peter NMN Tsai, M. Ghelman, Alan Keith Thompson, R. M. Ibberson, George M. Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
We describe the process of selecting a silicon photomultiplier (SiPM) as the light sensor for an ultrathin (2 nm) highly efficient cold neutron proportional counter. The neutron detector consists of 6LiF:ZnS(Ag) scintillator in which wavelength shifting

6 LiF:ZnS(Ag) Mixture Optimization for a Miniature Highly Efficient Cold Neutron Detector

April 2, 2018
Author(s)
A. Osovizky, Kevin N. Pritchard, Jeffrey B. Ziegler, Louis E. Binkley, Y. Yehuda-Zada, Peter NMN Tsai, Alan Keith Thompson, P. Yvonne Barnes, Kerry Siebein, Nancy Hadad, M. Jackson, C. Hurlbut, R. Ibberson, George M. Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
We report the optimization of a ^6^LiF:ZnS(Ag) scintillator mixture for an ultrathin (2nm), highly efficient cold neutron dector. Preliminary results with early protypes demonstrate excellent for 3.62 meV (4.75 Angstrom wavelenght) neutrons but mediocre

Correlation Between Morphology and Device Performance of pBTTT:PC 71 BM Solar Cells

October 1, 2016
Author(s)
Wenluan Zhang, Hao Shen, Brett W. Guralnick, Brian Kirby, Ngoc A. Nguyen, Roddel Remy, Charles Majkrzak, Michael E. Mackay
Phenyl-C71-butyric acid methyl ester (PC71BM) could intercalate between the side-chains of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene (pBTTT) creating a stable co-crystal structure, so optimal solar cell performance was obtained at high

Measurement and Modeling of Polarized Specular Neutron Reflectivity in Large Magnetic Fields

August 1, 2016
Author(s)
Brian B. Maranville, Brian J Kirby, Alexander J Grutter, Paul Kienzle, Charles F. Majkrzak, Yaohua Liu, Cindi L. Dennis
The presence of a large applied magnetic field removes the degeneracy of the vacuum energy states for spin-up and spin-down neutrons. For polarized neutron reflectometry, this must be included in the reference potential energy of the Schrodinger equation

Surface Segregation Driven by Molecular Architecture Asymmetry in Polymer Blends

November 28, 2014
Author(s)
Jae Sik Lee, Nam-Heui Lee, Somesh Peri, Mark D. Foster, Charles Majkrzak, Renfeng Hu, David T. Wu
The contributions of chain ends and branch points to surface segregation of long-branched chains in blends with linear chains have been studied using Neutron Reflectometry and Surface-Enhanced Raman Spectroscopy for a series of novel, well-defined

Phase-Sensitive Small-Angle Neutron Scattering

April 1, 2014
Author(s)
Charles F. Majkrzak, Kathryn L. Krycka, Susan Krueger, Norman F. Berk, Paul A. Kienzle, Brian B. Maranville
A method is described for determining the neutron scattering length density distribution of a molecular scale object directly from phase-sensitive small angle neutron scattering (SANS). The structure factor amplitude is obtained through the use of a