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Physics

Nuclear physics

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Displaying 226 - 245 of 245

Erratum: Scintillation time dependence and pulse shape discrimination in liquid argon

March 2, 2010
Author(s)
W. H. Lippincott, Kevin Coakley, D. Gastler, A. Hime, E. Kearns, D. N. McKinsey, J. A. Nikkel, L.C. Stonehill
We have found an error in the code used to perform the multibin method analysis of Sec. III C in which events were compared to a template trace calculated from the wrong photoelectron bin (the index l in Eqs. (14) and (15) did not match the observed signal

Prospects for a New Cold Neutron Beam Measurement of the Neutron Lifetime

October 5, 2009
Author(s)
Maynard S. Dewey, Kevin J. Coakley, David M. Gilliam, G. Greene, A. Laptev, Jeffrey S. Nico, William M. Snow, F. E. Wiefeldt, A. Yue
In the most accurate cold neutron beam determination of the neutron lifetime based on the absolute counting of decay protons, the largest uncertainty was attributed to the absolute determination of the capture flux of the cold neutron beam. Currently an

Neutron Beta-Decay

September 16, 2009
Author(s)
Jeffrey S. Nico
Studies of low-energy processes, such as neutron beta-decay, contribute important information regarding die rent aspects of physics including nuclear and particle physics and cosmology. The information from these systems is often complementary to that

Improved Isotopic Analysis With a Large Array of Gamma-Ray Microcalorimeters

June 30, 2009
Author(s)
Nikhil Jethava, Joel N. Ullom, Douglas A. Bennett, William B. Doriese, James A. Beall, Gene C. Hilton, Robert D. Horansky, Kent D. Irwin, Eric Sassi, Leila R. Vale, Minesh K. Bacrania, Andrew Hoover, P. J. Karpius, Michael W. Rabin, Clifford R. Rudy, Duc T. Vo
We present results from the largest array of gamma-ray microcalorimeters operated to date. The microcalorimeters consist of Mo/Cu transition-edge sensors with attached Sn absorbers. The detector array contains 66 pixels each with an active area 2.25 mm 2

Ultra-high resolution alpha particle spectroscopy using calorimetry

September 23, 2008
Author(s)
Robert D. Horansky, Joel N. Ullom, James A. Beall, Gene C. Hilton, Kent D. Irwin, Don Dry, Beth Hastings, Stephen Lamont, Clifford R. Rudy, Michael W. Rabin
Calorimetry has been used since the late 1700?s to measure the heat output of physical processes ranging from chemical reactions to the respiration of organisms . Calorimetry is performed by measuring the temperature change caused by heat release into a

Optical Microchip Detection of Nuclear Magnetic Resonance

May 4, 2008
Author(s)
M Ledbetter, I Savukov, D Budker, Vishal Shah, Svenja A. Knappe, John Kitching, S Xu, D Michalak, A Pines
We demonstrate optical detection of nuclear magnetic resonance on a microchip. A theoretical optimization indicates detection limits that are competitive with that demonstrated by microcoils in high magnetic fields, without requiring superconducting

Quantifying Uncertainty in Nuclear Analytical Measurements

July 1, 2004
Author(s)
Lloyd A. Currie
This document resulted from a request at an International Atomic Energy Agency Consultants' Meeting. Information is based on a document Foundationsand future of detection and quantification limits prepared for the 1996 Proceedings of the Joint Statistical

Large-Area TKIDs for a New Generation of Neutron Beta Decay Experiments

January 1, 2001
Author(s)
Elizabeth Scott, Jimmy P. Caylor, Maynard S. Dewey, Jiansong Gao, Colin A. Heikes, Shannon Hoogerheide, Hans Pieter Mumm, Jeffrey S. Nico, Joel Ullom, Michael Vissers
Nuclear physics has long played a central role in our efforts to better understand the natural world. Several experiments are well positioned to improve limits in searches for physics Beyond the Standard Model (BSM). Many of the experiments in nuclear