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Physics

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Displaying 626 - 650 of 4526

Toward a New Primary Standardization of Radionuclide Massic Activity Using Microcalorimetry and Quantitative Milligram-Scale Samples

February 24, 2022
Author(s)
Ryan P. Fitzgerald, Bradley Alpert, Dan Becker, Denis E. Bergeron, Richard Essex, Kelsey Morgan, Svetlana Nour, Galen O'Neil, Dan Schmidt, Gordon A. Shaw, Daniel Swetz, R. Michael Verkouteren, Daikang Yan
We present a new paradigm for the primary standardization of radionuclide activity per mass of solution (Bq/g). Two key enabling capabilities are 4π decay-energy spectrometry using chip-scale sub-Kelvin microcalorimeters and direct realization of mass by

Joint Determination of Reactor Antineutrino Spectra from 235U and 239Pu Fission using the Daya Bay and PROSPECT Experiments

February 22, 2022
Author(s)
Hans Pieter Mumm, Denis E. Bergeron, Mark Tyra, Svetlana Nour, Jerome LaRosa, The PROSPECT Collaboration
A joint determination of the reactor antineutrino spectra resulting from the fission of 235U and 239Pu has been carried out by the Daya Bay and PROSPECT collaborations. This letter defines the level of compatibility of 235U spectrum measurements from the

Joint Measurement of the 235U Antineutrino Spectrum with PROSPECT and STEREO

February 22, 2022
Author(s)
Hans Pieter Mumm, Denis E. Bergeron, Mark Tyra, Jerome LaRosa, Svetlana Nour, PROSPECT collaboration, STEREO collaboration
The PROSPECT and STEREO collaborations present a combined measurement of the pure 235U antineutrino spectrum, with site specific corrections and effects dependent on the separate detectors removed. The spectral measurements of the two highest-precision

Prospects for assembling ultracold radioactive molecules from laser-cooled atoms

February 21, 2022
Author(s)
Jacek Klos, Hui Li, Eite Tiesinga, Svetlana Kotochigova
Molecules with unstable isotopes often contain heavy and deformed nuclei and thus possess a high sensitivity to parity-violating effects, such as Schiff moments. Currently the best limits on Schiff moments are set with diamagnetic atoms. Polar molecules

The Crane Operator's Tricks and other Shenanigans with a Pendulum

February 18, 2022
Author(s)
Stephan Schlamminger, Leon Chao, David B. Newell, Vincent Lee
The dynamics of a swinging payload suspended from a stationary crane can be described as a simple pendulum, typically an unwelcome phenomenon on a construction site. An experienced crane operator can deliver a swinging payload and stop dead on target in a

Heterosubstrate Illumination Effects in III-V Solar Cells

February 16, 2022
Author(s)
Brianna Conrad, Behrang Hamadani
Reference cell-based current versus voltage ( I–V ) measurements assume that the effect of an illumination spectrum on a solar cell's performance can be fully captured by the multiplication of the spectrum with the device's spectral response and subsequent

Nuclear Data to Reduce Uncertainties in Reactor Antineutrino Measurements

February 16, 2022
Author(s)
Hans Pieter Mumm, Catherine Romano, Nathaniel Bowden, Andrew Conant, Bethany Goldblum, Patrick Huber, Jonathan Link, Bryce Littlejohn, Juan Pedro Ochoa-Ricoux, Shikha Prasad, Catherine Riddle, Alejandro Sonzogni, William Wieselquist
The large quantities of antineutrinos produced through the decay of fission fragments in nuclear reactors provide an opportunity to study the properties of these particles and to investigate their use in reactor monitoring. The reactor antineutrino spectra

Silicone tube humidity generator

February 16, 2022
Author(s)
Robert F. Berg, Nicola Chiodo, Eric Georgin
We describe the model and construction of a two-flow (or divided-flow) humidity generator, developed at LNE-CNAM, that uses mass flow controllers to mix a stream of dry gas with a stream of humid gas saturated at 28 °C. It can generate a wide range of

Feasibility study of quantum computing using trapped electrons

February 15, 2022
Author(s)
Qian Yu, Alberto Alonso, Jackie Caminiti, Robert Sutherland, Dietrich Leibfried, Kayla Rodriguez, Madhav Dhital, Boerge Hemmerling, Hartmut Haeffner, Kristin Beck
We investigate the feasibility of using electrons in a linear Paul trap as qubits in a future quantum computer. We discuss the necessary experimental steps to realize such a device through a concrete design proposal, including trapping, cooling, electronic