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Search Publications by: Jeffrey S. Nico (Fed)

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Displaying 1 - 25 of 159

Recoil-Order and Radiative Corrections to the aCORN Experiment

July 8, 2024
Author(s)
Maynard Dewey, Jeffrey Nico, Fred Wietfeldt
The aCORN experiment measures the electron-antineutrino a-coefficient in free neutron decay. We update the previous aCORN results to include radiative and recoil corrections to first order. The corrected combined result is a = -0.10859 +/- 0.00125 (stat) +

Comment on "Search for explanation of the neutron lifetime anomaly"

June 23, 2023
Author(s)
Fred Wietfeldt, Ripan Biswas, Jimmy Caylor, Bret Crawford, Maynard Dewey, Nadia Fomin, Geoffrey Greene, Christopher Haddock, Shannon Hoogerheide, Hans Mumm, Jeffrey Nico, William Snow, Joseph Zuchegno
We respond to issues raised by Serebrov et al. in a recent paper regarding systematic effects in the beam neutron lifetime experiment performed at NIST. We show that these effects were considered in the original analyses and that our corrections and

Results from the Baksan Experiment on Sterile Transitions (BEST)

June 9, 2022
Author(s)
Jeffrey S. Nico, V Barinov, Bruce Cleveland, S Danshin, H Ejiri, Steve Elliott, D Frekers, Vladimir Gavrin, Valery Gorbachev, D Gorbunov, Wick Haxton, Tanya Ibragimova, I Kim, Yu Kozlova, L Kravchuk, V Kuzminov, B Lubsandorzhiev, Yu Malyshkin, R Massarczyk, Victor Matveev, Ilya Mirmov, A Petelin, R Robertson, D Sinclair, A Shikhin, V Tarasov, G Trubnikov, E Veretenkin, John Wilkerson, A Zvir
The Baksan Experiment on Sterile Transitions (BEST) was designed to investigate the deficit of electron neutrinos, nu_e, observed in previous gallium-based radiochemical measurements with high-intensity neutrino sources, commonly referred to as the gallium

Search for electron-neutrino transitions to sterile states in the BEST experiment

June 9, 2022
Author(s)
Jeffrey S. Nico, V. Barinov, S.N. Danshin, V.N. Gavrin, V.V. Gorbachev, D.S. Gorbunov, T.V. Ibragimova, Yu.P. Kozlova, L.V. Kravchuk, V.V. Kuzminov, B.K. Lubsandorzhiev, Yu.M. Malyshkin, I.N. Mirmov, A.A. Shikhin, E.P. Veretenkin, B.T. Cleveland, H. Ejiri, S.R. Elliott, I. Kim, R. Massarczyk, D. Frekers, W.C. Haxton, V.A. Matveev, G.V. Trubnikov, A.L. Petelin, V.A. Tarasov, A.I. Zvir, R.G.H. Robertson, D. Sinclair, J.F. Wilkerson
The Baksan Experiment on Sterile Transitions (BEST) probes the gallium anomaly and its possible connections to oscillations between active and sterile neutrinos. Based on the Gallium- Germanium Neutrino Telescope (GGNT) technology of the SAGE experiment

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

Neutron Spin Rotation Measurements

April 15, 2021
Author(s)
Jeffrey S. Nico, Shannon Hoogerheide, Hans Pieter Mumm, Murad Sarsour, J Amadio, Eamon Anderson, Libertad Barron-Palos, Bret Crawford, Chris Crawford, D. Esposito, Walter Fox, I Francis, J Fry, Chris Haddock, Adam Holley, Kirill Korsak, J Lieers, S Magers, M. Maldonado-Velazquez, D Mayorov, T Okudaira, C Paudel, S Santra, H.M. Shimizu, William M. Snow, A. Sprow, K. Steen, H E. Swanson, John Vanderwerp, P. A. Yergeau
The neutron spin rotation (NSR) collaboration used parity-violating spin rotation of transversely polarized neutrons transmitted through a 0.5 m liquid helium target to constrain weak coupling constants between nucleons. While consistent with theoretical

Position-dependent neutron detection efficiency loss in 3He gas proportional counters

August 22, 2020
Author(s)
Patrick N. Peplowski, Zachary W. Yokley, Madison Liebel, Shuo Cheng, Richard C. Elphic, Shannon Hoogerheide, David J. Lawrence, Jeffrey Nico
The position-dependent neutron detection response of a 3He gas proportional counter (GPC) was characterized using a collimated (3-mm-wide), monoenergetic 0.05 eV neutron beam. For neutrons incident on the GPC near the ends of the active region, the neutron

Experimental Upper Bound and Theoretical Expectations for Parity-Violating Neutron Spin Rotation in He-4

July 16, 2019
Author(s)
Jeffrey S. Nico, Hans P. Mumm, H E. Swanson, C. D. Bass, T. D. Bass, J M. Dawkins, J C. Horton, D Luo, William M. Snow, S. C. Walbridge, B. E. Crawford, K. F. Gan, A M. Micherdzinska, C. R. Huffer, D M. Markoff, Murad Sarsour, E I. Sharapov, V Zhumabekova, Blayne R. Heckel
Neutron spin rotation is expected from quark-quark weak interactions in the Standard Model, which induce weak interactions among nucleons that violate parity. We present the results from an experiment searching for the effect of parity violation via the

Precision determination of absolute neutron flux

June 8, 2018
Author(s)
Jeffrey S. Nico, Maynard S. Dewey, David M. Gilliam, Andrew T. Yue, Eamon Anderson, Geoff Greene, Alexander Laptev, William M. Snow
A technique for establishing the total neutron rate of a highly-collimated monochromatic cold neutron beam was demonstrated using the method of an alpha- gamma counter. The method requires only the counting of measured rates and is independent of neutron

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 Backscatter-Suppressed Beta Spectrometer

June 16, 2017
Author(s)
Maynard S. Dewey, Taufique Hassan, Fred B. Bateman, Brian Collett, Guillaume Darius, Christina DeAngelis, Gordon L. Jones, Alexander Komives, Alexander Laptev, Michael Mendenhall, Jeffrey S. Nico, George Noid, Ed Stephenson, Fred Wietfeldt, Isaac Stern, Bob Trull
Backscatter of electrons from a beta spectrometer, with incomplete energy deposition, can lead to undesirable effects in many types of experiments. We present and discuss the design and operation of a backscatter-suppressed beta spectrometer that was

Precision measurement of the radiative beta decay of the free neutron

June 14, 2016
Author(s)
Jeffrey S. Nico, Kevin J. Coakley, Maynard S. Dewey, Thomas R. Gentile, Hans P. Mumm, Alan Keith Thompson, M J. Bales, R. Alarcon, C. D. Bass, E J. Beise, H Breuer, Jim Byrne, R L. Cooper, B. O'Neill, F E. Wietfeldt, T E. Chupp
The theory of quantum electrodynamics predicts that a continuous spectrum of photons is emitted in the beta decay of the free neutron in addition to a proton, an electron, and an antineutrino. We report the first precision test of the shape of the photon