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Displaying 701 - 725 of 2957

A New Determination of G

October 12, 2021
Author(s)
J P. Schwarz, J E. Faller, T M. Niebauer, F Klopping, D S. Robertson, G Sasagawa
A short test run of the apparatus was conducted in February 1997 and gave promising results. A difference signal of about 80 υGal was observed, with reasonable scatter in G values from day to day. A sample of the data is seen in figure 1. This scatter

Progress on the BL2 beam measurement of the neutron lifetime

April 17, 2021
Author(s)
Shannon M. Hoogerheide, Jimmy P. Caylor, Evan R. Adamek, Eamon S. Anderson, Ripan Biswas, B. E. Crawford, Christina DeAngelis, Maynard S. Dewey, N Fomin, David M. Gilliam, Kyle Grammer, G L. Greene, Robert W. Haun, Jonathan Mulholland, Hans Pieter Mumm, Jeffrey S. Nico, William M. Snow, F E. Wietfeldt, Andrew Yue
A precise value of the neutron lifetime is important in several areas of physics, including determinations of the quark-mixing matrix element |Vud|, related tests of the Standard Model, and predictions of light element abundances in Big Bang

aCORN: an experiment to measure the electron-antineutrino correlation coefficient in free neutron decay

August 1, 2017
Author(s)
Maynard S. Dewey, Fred B. Bateman, Wangchun Chen, Thomas R. Gentile, Md. T. Hassan, Michael P. Mendenhall, Jeffrey S. Nico, Brian Collett, Jim Byrne, William Byron, Guillaume Darius, Christina DeAngelis, Gordon L. Jones, Alexander Komives, Alexander Laptev, George Noid, Hyeonseo Park, Ed Stephenson, I Stern, K Stockton, Bob Trull, Fred Wietfeldt, B G. Yerozolimsky
We describe an apparatus used to measure the electron-neutrino angular correlation coefficient, a, in free neutron decay. The apparatus employs a novel measurement technique in which the angular correlation is converted into a proton time-of-flight

A Reassessment of Absolute Energies of X-ray L Lines of Lanthanide Metals

June 28, 2017
Author(s)
Bradley Alpert, W.Bertrand (Randy) Doriese, Gene C. Hilton, Lawrence T. Hudson, Young I. Joe, Kelsey Morgan, Carl D. Reintsema, Dan Schmidt, Daniel Swetz, Csilla Szabo-Foster, Joel Ullom, Joseph Fowler, Galen O'Neil, Douglas Bennett
We introduce a new technique for determining x-ray fluorescence line energies and widths, and we present measurements made with this technique of 22 x-ray L lines from lanthanide-series elements. The technique uses arrays of transition-edge sensors

Reply to Comments on 'Dimensionless units in the SI'

January 2, 2016
Author(s)
Peter Mohr, William D. Phillips
We reply to a Comment on our paper 'Dimensionless units in the SI', addressing the objections by clarifying and expanding the arguments of that paper.

Enhanced Sensitivity to Variation of m e /m p in Molecular Spectra

October 16, 2008
Author(s)
D DeMille, S Sainis
We propose new experiments with high sensitivity to a variation in the electron-to-proton mass ratio \mu=me/mp. We consider a close pair of molecular vibrational levels, where each state is associated with a different electronic potential. The change in

The Next Generation of the NIST Watt Balance

August 1, 1998
Author(s)
David B. Newell, Richard L. Steiner, Edwin R. Williams, Alain Picard
Reduction in the total uncertainty of the NIST Watt Balance is limited by the present configuration of the experiment. Most of the major relative uncertainty components arise from the fact that the experiment is performed in air. To reduce the contribution

Experimental Noise Sources in the NIST Watt Balance

July 1, 1998
Author(s)
Richard L. Steiner, David B. Newell, Edwin R. Williams
The present NIST Watt Balance has a relative combined standard uncertainty of about 145 nW/W. The final results of this phase of the experiment are presented. Improvements in the Type B (nonstatistical) uncertainty contributions, along with several

ESTIMATING UNCERTAINTY LIMITS IN THE NIST-2008 ELECTRONIC KILOGRAM

Author(s)
Richard L. Steiner, Edwin R. Williams, Ruimin Liu, Beatrice Parker
The NIST electronic kilogram has had three published results, each with slightly less uncertainty. In the present design, there are several measurement components that have uncertainties that are difficult to reduce further. These limiting uncertainties

A practical field guide to thermoelectrics: fundamentals, synthesis, and characterization

June 27, 2018
Author(s)
Alex Zevalkink, David M. Smiadak, Joshua Martin, Michael Chabinyc, Olivier Delaire, Jeffrey Blackburn, Andrew Ferguson, Jian Wang, Kirill Kovnir, Laura Schelhas, Stephen D. Kang, Maxwell T. Dylla, G. J. Snyder, Brenden Ortiz, Eric Toberer
… A practical field guide to thermoelectrics: fundamentals, synthesis, and characterization …
Displaying 701 - 725 of 2957
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