Precision Measurement of the Neutron Scattering Length of 
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 Using Neutron Interferometry

Haun, Robert; Wietfeldt, F. E.; Arif, Muhammad; Huber, M.; Black, T.; Heacock, Benjamin; Pushin, D. A.; Shahi, Chandra

doi:10.1103/physrevlett.124.012501

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…Being based on the superposition of matter waves of a single electrically neutral particle with spin 1/2, neutron interferometry was used for a large number of critical tests of quantum mechanics, from the 4 symmetry of fermions (Rauch et al, 1975) to the demonstration of the quantum Cheshire Cat (Denkmayr et al, 2014). It was used to study the interplay with gravity in the famous Colella-Overhauser-Werner (COW) experiment (Colella et al, 1975), to measure neutron scattering lengths (Haun et al, 2020) and to search for the existence of hypothetical new forces (Lemmel et al, 2015;Li et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Neutron interference from a split-crystal interferometer

et al. 2022

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The first successful operation of a neutron interferometer with a separate beam-recombining crystal is reported. This result was achieved at the neutron interferometry setup S18 at the ILL in Grenoble by a collaboration between TU Wien, ILL, Grenoble, and INRIM, Torino. While previous interferometers have been machined out of a single-crystal block, in this work two crystals were successfully aligned on nanoradian and picometre scales, as required to obtain neutron interference. As a decisive proof-of-principle demonstration, this opens the door to a new generation of neutron interferometers and exciting applications.

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Section: Introductionmentioning

confidence: 99%

Neutron interference from a split-crystal interferometer

et al. 2022

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“…Given our result and its consistency with other n-4 He measurements, we strongly suspect that there is an unaccounted-for systematic uncertainty that somehow crept into the neutron interferometry result in n-4 He. It is therefore very timely that a new neutron interferometry measurement of the coherent scattering length of n-4 He, conducted mainly with the motivation to help constrain the three-nucleon interaction, has been recently carried out at the Neutron Interferometry and Optics Facility (NIOFa) at the NIST Center for Neutron Research, described in a recent Ph.D thesis [56], however the results are not published at the time of this writing.…”

Section: Uncertainty In Simulationmentioning

confidence: 99%

Measurement of the total neutron-scattering cross-section ratios of noble gases of natural isotopic composition using a pulsed neutron beam

et al. 2019

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Precision measurements of slow neutron cross sections with atoms have several scientific applications. In particular the n-4 He s-wave scattering length is important to know both for helping to constrain the nuclear three-body interaction and for the proper interpretation of several ongoing slow neutron experiments searching for other types of neutron-atom interactions. We present new measurements of the ratios of the neutron differential scattering cross sections for natural isotopicabundance mixtures of the noble gases He, Ar, Kr, and Xe to natural isotopic abundance Ne.These measurements were performed using a recently developed neutron scattering apparatus for gas samples located on a pulsed slow neutron beamline which was designed to search for possible exotic neutron-atom interactions and employs both neutron time of flight information and a position -sensitive neutron detector for scattering event reconstruction. We found agreement with the literature values of scattering cross sections inferred from Ar/Ne, Kr/Ne and Xe/Ne differential cross section ratios over the q range of 1 − 7 nm −1 . However for the case of He/Ne we find that the cross section inferred differs by 11.3% (7.6 σ) from previously-reported values inferred from neutron phase shift measurements, but is in reasonable agreement with values from other measurements.The very large discrepancy in the He/Ne ratio calls for a new precision measurement of the n-4 He scattering length using neutron interferometry.

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“…Being based on the superposition of matter waves of a single, electrically neutral particle with spin 1/2, neutron interferometry was used for a large number of critical tests of quantum mechanics, from the 4π symmetry of fermions [3] to the demonstration of the Quantum Cheshire Cat [4]. It was used to study the interplay with gravity in the famous COW experiment [5], to measure neutron scattering lengths [6] and to search for the existence of hypothetical new forces [7,8].…”

Section: Introductionmentioning

confidence: 99%

Neutron interference from a split-crystal interferometer

Lemmel,

Jentschel,

Abele

et al. 2022

Preprint

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We report the first successful operation of a neutron interferometer having a separate beamrecombining crystal. We achieved this result at the neutron interferometry setup S18 at the ILL in Grenoble by a collaboration between TU Wien, ILL Grenoble and INRIM Torino. While previous interferometers were machined out of a single crystal block, we managed to align two crystals on nanoradian and picometer scales, as required to obtain neutron interference. As a decisive proof of principle demonstration, it opens the door to a new generation of neutron interferometers and exciting applications.

show abstract

Precision Measurement of the Neutron Scattering Length of He4 Using Neutron Interferometry

Cited by 10 publications

References 19 publications

Neutron interference from a split-crystal interferometer

Neutron interference from a split-crystal interferometer

Measurement of the total neutron-scattering cross-section ratios of noble gases of natural isotopic composition using a pulsed neutron beam

Neutron interference from a split-crystal interferometer

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