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Physics Programs & Projects

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Magnetically Trapped Neutron Lifetime Experiment
Last Updated Date: 07/22/2013

The decay of the free neutron is the simplest nuclear beta decay and is the prototype for all charged current semi-leptonic weak interactions.  … more

High-Efficiency Neutron Detection and Spectroscopy
Last Updated Date: 07/22/2013

Precise knowledge of the fast neutron spectrum and fluencies is essential for several experimental endeavors requiring the low-background of the … more

Alpha-gamma Counting for High Accuracy Fluence Measurements
Last Updated Date: 07/22/2013

Neutron fluence is measured by counting gamma-rays from the reaction n+ 10 B® 4 He+ 7 Li + g(478KeV) with a calibrated gamma detector. The gamma … more

Frequency Conversion Interfaces for Photonic Quantum Systems
Last Updated Date: 07/02/2013

Optical frequency conversion, in which the color of light is changed, is a process that has numerous applications in physics and technology.  For … more

Nanoplasmonics and Three-Dimensional Plasmonic Metamaterials
Last Updated Date: 06/28/2013

Metamaterials are tailor-made photonic composites--combinations of materials designed to achieve optical properties not seen in nature. The … more

High-Resolution Atomic Spectroscopy
Last Updated Date: 06/06/2013

Accurate measurements of atomic transitions using diffraction grating spectrographs, Fourier transform spectrometers, and laser spectroscopy. more

Last Updated Date: 06/05/2013

The purpose of the IEC 62755 standard N42 data format is to facilitate manufacturer-independent transfer of information from radiation measurement … more

Collagen Films Protocol
Last Updated Date: 05/08/2013

Background: Collagen type 1 is the most prevalent extracellular protein in connective tissue, and is part of the family of collagens that are … more

Last Updated Date: 05/08/2013

The NIST Thermodynamic Metrology Group maintains and develops national standards of temperature (in the range 0.65 K to 1235 K), and supports … more

Measuring Light-Matter Interactions in Chip-Based Optical Cavities
Last Updated Date: 04/11/2013

Measuring interactions between light and matter has both fundamental and practical importance. For example, lasers have had a profound influence … more

Absolute cryogenic infrared radiometry
Last Updated Date: 04/10/2013

In support of defense programs in remote sensing, NIST maintains the scale for infrared radiant flux by using the Absolute Cryogenic radiometer … more

Infrared cryogenic blackbody broadband calibration
Last Updated Date: 04/10/2013

The Missile Defense Agency (MDA) requires all test facilities to have their blackbodies calibrated at the NIST Low background infrared (LBIR) … more

Transfer radiometers and reference detectors
Last Updated Date: 04/10/2013

We have developed several portable radiometers to transfer the primary detector-based scales for optical power, radiance, and irradiance in the … more

High-Dose Dosimetry Uncertainty Tables
Last Updated Date: 04/02/2013

The high-dose dosimetry program supports radiation-processing applications by assuring that the absorbed dose to the product, often prescribed or … more

Theory of Transport in Graphene
Last Updated Date: 03/21/2013

Graphene, a single layer of carbon atoms, is one of the most likely materials to produce the next breakthrough in the electronics industry.  Ideal … more

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