Explanipedia

Recoil-order and radiative corrections to the aCORN experiment Open

F. E. Wietfeldt, W. A. Byron, B. Collett, M. S. Dewey, T. Gentile , et al. · 2024

The aCORN experiment measures the electron-antineutrino correlation 𝑎 coefficient in free neutron decay. We update the previous aCORN results [G. Darius et al., Phys. Rev. Lett. 119, 042502 (2017) and M. T. Hassan et al., Phys. Rev. C 103,…

Recoil-Order and Radiative Corrections to the aCORN Experiment Open

F. E. Wietfeldt, W. A. Byron, B. Collett, M. S. Dewey, T. Gentile , et al. · 2023

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, and discuss a key issue in the comparison of re…

Observation of a spin chirality driven topological transition in a van der Waals magnet Open

Yusuke Nambu, Kazushi Aoyama, Hikaru Kawamura, T. Gentile, Wangchun Chen , et al. · 2022

Low-dimensional magnetism has long been the central issue in condensed matter physics, and van der Waals materials provide an ideal platform for exploring magnetism at the two-dimensional limit. The magnetic order in two-dimensional model …

Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment Open

Md. T. Hassan, W. A. Byron, G. Darius, Christina DeAngelis, F. E. Wietfeldt , et al. · 2021

The aCORN experiment measures the neutron decay electron-antineutrino correlation ($a$-coefficient) using a novel method based on an asymmetry in proton time-of-flight for events where the beta electron and recoil proton are detected in de…

Neutron polarimetry using a polarized 3He cell for the aCORN experiment Open

Benjamin C. Schafer, W. A. Byron, Wangchun Chen, B. Collett, M. S. Dewey , et al. · 2020

Optimizing magnetically shielded solenoids Open

Wangchun Chen, Md. T. Hassan, R. W. Erwin, Shannon Watson, T. Gentile , et al. · 2020

An important consideration when designing a magnetostatic cavity for various applications is to maximize the ratio of the volume of field homogeneity to the overall size of the cavity. We report a design of a magnetically shielded solenoid…

Sensitive neutron transverse polarization analysis using a 3He spin filter Open

Yuan‐Yu Jau, Wangchun Chen, T. Gentile, Daniel S. Hussey · 2020

We report an experimental implementation for neutron transverse polarization analysis that is capable of detecting a small angular change (≪10−3 rad) in neutron spin orientation. This approach is demonstrated for monochromatic beams, and w…

Direct observation of neutron spin rotation in Bragg scattering due to the spin-orbit interaction in silicon Open

T. Gentile, M. G. Huber, D. D. Koetke, Michael A. Peshkin, M. Arif , et al. · 2019

As a neutron scatters from a target nucleus, there is a small but measurable effect caused by the interaction of the neutron's magnetic dipole moment with that of the partially screened electric field of the nucleus. This spin-orbit intera…

Demonstration of Focusing Wolter Mirrors for Neutron Phase and Magnetic Imaging Open

Daniel S. Hussey, Han Wen, Huarui Wu, T. Gentile, Wangchun Chen , et al. · 2018

Image-forming focusing mirrors were employed to demonstrate their applicability to two different modalities of neutron imaging, phase imaging with a far-field interferometer, and magnetic-field imaging through the manipulation of the neutr…

Demonstration of Focusing Wolter Mirrors for Neutron Phase and Magnetic Imaging Open

Daniel S. Hussey, Han Wen, Huarui Wu, T. Gentile, Wangchun Chen , et al. · 2018

Image-forming focusing mirrors were employed to demonstrate their applicability to two different modalities of neutron imaging, phase imaging with a far-field interferometer, and magnetic-field imaging through the manipulation of the neutr…

Optically polarized Open

T. Gentile, Pierre-Jean Nacher, B. Saam, Thad Walker · 2017

This article reviews the physics and technology of producing large quantities of highly spin-polarized ³He nuclei using spin-exchange (SEOP) and metastability-exchange (MEOP) optical pumping. Both technical developments and deep…

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

B. Collett, F. B. Bateman, W. Bauder, J. Byrne, W. A. Byron , et al. · 2017

We describe an apparatus used to measure the electron-antineutrino angular correlation coefficient in free neutron decay. The apparatus employs a novel measurement technique in which the angular correlation is converted into a proton time-…

Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point Open

Tao Hong, M. Matsumoto, Yiming Qiu, Wangchun Chen, T. Gentile , et al. · 2017

Spin-analyzed SANS for soft matter applications Open

Wangchun Chen, J. G. Barker, Ronald L. Jones, Kathryn Krycka, Shannon Watson , et al. · 2017

The small angle neutron scattering (SANS) of nearly Q-independent nuclear spin-incoherent scattering from hydrogen present in most soft matter and biology samples may raise an issue in structure determination in certain soft matter applica…

Direct observation of the Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point Open

Tao Hong, M. Matsumoto, Yiming Qiu, Wangchun Chen, T. Gentile , et al. · 2017

Spontaneous symmetry-breaking quantum phase transitions play an essential role in condensed matter physics. The collective excitations in the broken-symmetry phase near the quantum critical point can be characterized by fluctuations of pha…

Recent advancements of wide-angle polarization analysis with<sup>3</sup>He neutron spin filters Open

Wangchun Chen, T. Gentile, Q. Ye, A. Kirchhoff, Shannon Watson , et al. · 2016

Wide-angle polarization analysis with polarized 3He based neutron spin filters (NSFs) has recently been employed on the Multi-Axis Crystal Spectrometer (MACS) at the National Institute of Standards and Technology Center for Neutron Researc…

Precision Measurement of the RadiativeDecay of the Free Neutron Open

Matthew Bales, Ricardo Alarcón, C.D. Bass, E. J. Beise, H. Breuer , et al. · 2016

The standard model predicts that, in addition to a proton, an electron, and an antineutrino, a continuous spectrum of photons is emitted in the β decay of the free neutron. We report on the RDK II experiment which measured the photon spect…

A New Cold Neutron Imaging Instrument at NIST Open

Daniel S. Hussey, Christoph Brocker, J.C. Cook, David L. Jacobson, T. Gentile , et al. · 2015

The NIST neutron imaging program will build a new imaging instrument in the NCNR guide hall at the end of the neutron guide NG-6, beginning operation in summer of 2015. The NG-6 guide has a spectrum that is strongly peaked at a neutron wav…

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