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Yuji Hasegawa - One of the best experts on this subject based on the ideXlab platform.
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long time correlations in single Neutron Interferometry data
arXiv: Quantum Physics, 2020Co-Authors: Madita Willsch, Yuji Hasegawa, Stephan Sponar, Fengping Jin, K Michielsen, Dennis Willsch, Tobias Denkmayr, H De RaedtAbstract:We present a detailed analysis of the time series of time-stamped Neutron counts obtained by single-Neutron Interferometry. The Neutron counting statistics display the usual Poissonian behavior, but the variance of the Neutron counts does not. Instead, the variance is found to exhibit a dependence on the phase-shifter setting which can be explained by a probabilistic model that accounts for fluctuations of the phase shift. The time series of the detection events exhibit long-time correlations with amplitudes that also depend on the phase-shifter setting. These correlations appear as damped oscillations with a period of about 2.8 s. By simulation, we show that the correlations of the time differences observed in the experiment can be reproduced by assuming that, for a fixed setting of the phase shifter, the phase shift experienced by the Neutrons varies periodically in time with a period of 2.8 s. The same simulations also reproduce the behavior of the variance. Our analysis of the experimental data suggests that time-stamped data of singleparticle interference experiments may exhibit transient features that require a description in terms of non-stationary processes, going beyond the standard quantum model of independent random events.
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long time correlations in single Neutron Interferometry data
Journal of the Physical Society of Japan, 2020Co-Authors: Stephan Sponar, Fengping Jin, K Michielsen, Madita Willsch, Dennis Willsch, Tobias Denkmayr, Yuji HasegawaAbstract:We present a detailed analysis of the time series of time-stamped Neutron counts obtained by single-Neutron Interferometry. The Neutron counting statistics display the usual Poissonian behavior, bu...
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spin rotation coupling observed in Neutron Interferometry
npj Quantum Information, 2020Co-Authors: Armin Danner, Wenzel Kersten, Yuji Hasegawa, Stephan Sponar, Hartmut Lemmel, R E Wagner, Bulent DemirelAbstract:Einstein’s theory of general relativity and quantum theory form the two major pillars of modern physics. However, certain inertial properties of a particle’s intrinsic spin are inconspicuous while the inertial properties of mass are well known. Here, by performing a Neutron interferometric experiment, we observe phase shifts arising as a consequence of the spin’s coupling with the angular velocity of a rotating magnetic field. This coupling is a purely quantum mechanical extension of the Sagnac effect. The resulting phase shifts linearly depend on the frequency of the rotation of the magnetic field. Our results agree with the predictions derived from the Pauli–Schrodinger equation.
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3D printed magnets for Neutron spin manipulation
EPJ Web of Conferences, 2019Co-Authors: Richard Wagner, Florian Bruckner, Wenzel Kersten, Laurids Brandl, Yuji Hasegawa, Stephan Sponar, Christian Huber, Dieter SuessAbstract:Devices for manipulation of the Neutron spin are vital for experiments in Neutron optics such as Neutron Interferometry. Here we introduce a new type of such devices which are based on a magnetic material that can be 3D printed in complex shapes. We have constructed a spin flipper wherein the angle of spin rotation can be adjusted by variation of the distance between magnetized pieces. As the device does not contain any heat dissipating coils we expect interferometric measurements to become more stable and hence more accurate. Results of an experiment using polarized Neutrons verify the device's functionality, and indicate the potential of the new method. A second experiment for demonstration of the 4π spinor symmetry of fermionic wave functions is in progress.
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additive manufactured and topology optimized permanent magnet spin rotator for Neutron Interferometry
Physical review applied, 2019Co-Authors: Wenzel Kersten, Dieter Suess, Florian Bruckner, Laurids Brandl, Yuji Hasegawa, Christian Huber, R E Wagner, Stephan SponarAbstract:Topology-optimized 3D-printed magnets are interesting for Larmor spin-rotators in Neutron optics in general, and in Neutron Interferometry in particular. Using 3D-printed magnets instead of magnetic coils avoids heat dissipation, which is the the main cause of loss in fringe visibility, due to temperature gradients in the interferometer. This study applies the technique to implement an arbitrary Neutronic phase gate, for rotations of up to $4\ensuremath{\pi}$ of the Neutron's spinor wave function in one arm of the interferometer. This is achieved by varying the distance between the 3D-printed magnets, while maintaining homogeneity of the magnetic action over the Neutron beam's profile.
Stephan Sponar - One of the best experts on this subject based on the ideXlab platform.
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long time correlations in single Neutron Interferometry data
Journal of the Physical Society of Japan, 2020Co-Authors: Stephan Sponar, Fengping Jin, K Michielsen, Madita Willsch, Dennis Willsch, Tobias Denkmayr, Yuji HasegawaAbstract:We present a detailed analysis of the time series of time-stamped Neutron counts obtained by single-Neutron Interferometry. The Neutron counting statistics display the usual Poissonian behavior, bu...
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long time correlations in single Neutron Interferometry data
arXiv: Quantum Physics, 2020Co-Authors: Madita Willsch, Yuji Hasegawa, Stephan Sponar, Fengping Jin, K Michielsen, Dennis Willsch, Tobias Denkmayr, H De RaedtAbstract:We present a detailed analysis of the time series of time-stamped Neutron counts obtained by single-Neutron Interferometry. The Neutron counting statistics display the usual Poissonian behavior, but the variance of the Neutron counts does not. Instead, the variance is found to exhibit a dependence on the phase-shifter setting which can be explained by a probabilistic model that accounts for fluctuations of the phase shift. The time series of the detection events exhibit long-time correlations with amplitudes that also depend on the phase-shifter setting. These correlations appear as damped oscillations with a period of about 2.8 s. By simulation, we show that the correlations of the time differences observed in the experiment can be reproduced by assuming that, for a fixed setting of the phase shifter, the phase shift experienced by the Neutrons varies periodically in time with a period of 2.8 s. The same simulations also reproduce the behavior of the variance. Our analysis of the experimental data suggests that time-stamped data of singleparticle interference experiments may exhibit transient features that require a description in terms of non-stationary processes, going beyond the standard quantum model of independent random events.
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spin rotation coupling observed in Neutron Interferometry
npj Quantum Information, 2020Co-Authors: Armin Danner, Wenzel Kersten, Yuji Hasegawa, Stephan Sponar, Hartmut Lemmel, R E Wagner, Bulent DemirelAbstract:Einstein’s theory of general relativity and quantum theory form the two major pillars of modern physics. However, certain inertial properties of a particle’s intrinsic spin are inconspicuous while the inertial properties of mass are well known. Here, by performing a Neutron interferometric experiment, we observe phase shifts arising as a consequence of the spin’s coupling with the angular velocity of a rotating magnetic field. This coupling is a purely quantum mechanical extension of the Sagnac effect. The resulting phase shifts linearly depend on the frequency of the rotation of the magnetic field. Our results agree with the predictions derived from the Pauli–Schrodinger equation.
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3D printed magnets for Neutron spin manipulation
EPJ Web of Conferences, 2019Co-Authors: Richard Wagner, Florian Bruckner, Wenzel Kersten, Laurids Brandl, Yuji Hasegawa, Stephan Sponar, Christian Huber, Dieter SuessAbstract:Devices for manipulation of the Neutron spin are vital for experiments in Neutron optics such as Neutron Interferometry. Here we introduce a new type of such devices which are based on a magnetic material that can be 3D printed in complex shapes. We have constructed a spin flipper wherein the angle of spin rotation can be adjusted by variation of the distance between magnetized pieces. As the device does not contain any heat dissipating coils we expect interferometric measurements to become more stable and hence more accurate. Results of an experiment using polarized Neutrons verify the device's functionality, and indicate the potential of the new method. A second experiment for demonstration of the 4π spinor symmetry of fermionic wave functions is in progress.
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additive manufactured and topology optimized permanent magnet spin rotator for Neutron Interferometry
Physical review applied, 2019Co-Authors: Wenzel Kersten, Dieter Suess, Florian Bruckner, Laurids Brandl, Yuji Hasegawa, Christian Huber, R E Wagner, Stephan SponarAbstract:Topology-optimized 3D-printed magnets are interesting for Larmor spin-rotators in Neutron optics in general, and in Neutron Interferometry in particular. Using 3D-printed magnets instead of magnetic coils avoids heat dissipation, which is the the main cause of loss in fringe visibility, due to temperature gradients in the interferometer. This study applies the technique to implement an arbitrary Neutronic phase gate, for rotations of up to $4\ensuremath{\pi}$ of the Neutron's spinor wave function in one arm of the interferometer. This is achieved by varying the distance between the 3D-printed magnets, while maintaining homogeneity of the magnetic action over the Neutron beam's profile.
H Rauch - One of the best experts on this subject based on the ideXlab platform.
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particle and or wave features in Neutron Interferometry
Journal of Physics: Conference Series, 2012Co-Authors: H RauchAbstract:Neutron Interferometry provides a powerful tool to investigate particle and wave features in quantum physics. Single particle interference phenomena can be observed with Neutrons and the entanglement of degrees of freedom, i.e., contextuality can be verified and used in further experiments. Entanglement of two photons, or atoms, is analogous to a double slit diffraction of a single photon, Neutron or atom. Neutrons are proper tools for testing quantum mechanics because they are massive, they couple to electromagnetic fields due to their magnetic moment, they are subject to all basic interactions, and they are sensitive to topological effects, as well. The 4π-symmetry of spinor wave functions, the spin-superposition law and many topological phenomena can be made visible, thus showing interesting intrinsic features of quantum physics. Related experiments will be discussed. Deterministic and stochastic partial absorption experiments can be described by Bell-type inequalities. Neutron Interferometry experiments based on post-selection methods renewed the discussion about quantum non-locality and the quantum measuring process. It has been shown that interference phenomena can be revived even when the overall interference pattern has lost its contrast. This indicates a persisting coupling in phase space even in cases of spatially separated Schrodinger cat-like situations. These states are extremely fragile and sensitive against any kind of fluctuations and other decoherence processes. More complete quantum experiments also show that a complete retrieval of quantum states behind an interaction volume becomes impossible in principle, but where and when a collapse of the wave-field occurs depends on the level of experiment.
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noise induced dephasing in Neutron Interferometry
Physical Review A, 2010Co-Authors: Georg Sulyok, Yuji Hasegawa, J Klepp, Hartmut Lemmel, H RauchAbstract:Decoherence phenomenona in a Neutron interferometer are analyzed by simulation of the effects of an environment with magnetic noise fields. Basic calculations and experiments show the validity and limitations of this model system. In particular, loss and recovery of the interference pattern with controllable noise sources in both interferometer arms are discussed in detail. In addition, the decoherence behavior at high interference order, where Schroedinger-cat-like states exist in the interferometer, is investigated. While at low interference order a smearing of the interference pattern is observed, at high interference order a smearing of the modulated momentum distribution occurs.
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experimental test of quantum contextuality in Neutron Interferometry
Physical Review Letters, 2009Co-Authors: Hannes Bartosik, Stephan Sponar, J Klepp, Claus Schmitzer, Adan Cabello, H Rauch, Yuji HasegawaAbstract:We performed an experimental test of the Kochen-Specker theorem based on an inequality derived from the Peres-Mermin proof, using spin-path (momentum) entanglement in a single Neutron system. Following the strategy proposed by Cabello et al.[Phys. Rev. Lett. 100, 130404 (2008)], a Bell-like state was generated, and three expectation values were determined. The observed violation 2.291+-0.008not<=1 clearly shows that quantum mechanical predictions cannot be reproduced by noncontextual hidden-variable theories.
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coherent energy manipulation in single Neutron Interferometry
Physical Review A, 2008Co-Authors: Stephan Sponar, Yuji Hasegawa, J Klepp, G Badurek, R Loidl, S Filipp, H RauchAbstract:We have observed the stationary interference oscillations of a triple-entangled Neutron state in an interferometric experiment. Time-dependent interaction with two radio-frequency (rf) fields enables coherent manipulation of an energy degree of freedom in a single Neutron. The system is characterized by a multiply entangled state governed by a Jaynes-Cummings Hamiltonian. The experimental results confirm coherence of the manipulation as well as the validity of the description.
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new measurements of the coherent and incoherent Neutron scattering lengths of 13c
Journal of Physics: Condensed Matter, 2008Co-Authors: Henry E Fischer, J Neuefeind, J M Simonson, R Loidl, H RauchAbstract:The techniques of Neutron Interferometry and Neutron diffraction were used to determine the coherent and incoherent Neutron scattering lengths of 13C. From a Neutron Interferometry measurement of the optical path difference in liquid samples, 13CS2 versus natCS2, we obtain a bound coherent scattering length of bcoh,13C = 6.542 ± 0.003 fm, which differs appreciably from the standard tabulated value of 6.19 ± 0.09 fm. The resulting contrast of only 0.106(3) fm with respect to bcoh,natC = 6.6484 ± 0.0013 fm has consequences for Neutron diffraction experiments involving 13C isotopic substitution. Combining our result for bcoh,13C with precise Neutron diffraction measurements of the self-scattering intensities of liquid samples, 13CS2 versus natCS2, and 13CO2 versus 12CO2, we deduce a bound incoherent scattering length of bincoh,13C = −0.42 ± 0.24 fm that is consistent with the standard tabulated value of −0.52 ± 0.09 fm. The results presented here have required accurate measurements of small effects, for which particular attention has been given to the data analysis.
D A Pushin - One of the best experts on this subject based on the ideXlab platform.
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precision measurement of the Neutron scattering length of 4 he using Neutron Interferometry
Physical Review Letters, 2020Co-Authors: Robert Haun, T. C. Black, Muhammad Arif, M G Huber, D A Pushin, F E Wietfeldt, Benjamin Heacock, Chandra ShahiAbstract:We report a 0.08% measurement of the bound Neutron scattering length of $^{4}\mathrm{He}$ using Neutron Interferometry. The result is $b=(3.0982\ifmmode\pm\else\textpm\fi{}0.0021[\mathrm{stat}]\ifmmode\pm\else\textpm\fi{}0.0014[\mathrm{syst}])\text{ }\text{ }\mathrm{fm}$. The corresponding free atomic scattering length is $a=(2.4746\ifmmode\pm\else\textpm\fi{}0.0017[\mathrm{stat}]\ifmmode\pm\else\textpm\fi{}0.0011[\mathrm{syst}])\text{ }\text{ }\mathrm{fm}$. With this result the world average becomes $b=(3.0993\ifmmode\pm\else\textpm\fi{}0.0025)\text{ }\text{ }\mathrm{fm}$, a 2% downward shift and a reduction in uncertainty by more than a factor of six. Our result is in disagreement with a previous Neutron interferometric measurement but is in good agreement with earlier measurements using Neutron transmission.
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angular alignment and fidelity of Neutron phase gratings for improved interferometer fringe visibility
AIP Advances, 2019Co-Authors: B Heacock, D Sarenac, David G Cory, M G Huber, Daniel S Hussey, Connor Kapahi, H Miao, H Wen, D A PushinAbstract:The recent development of phase-grating moire Neutron Interferometry promises a wide range of impactful experiments from dark-field imaging of material microstructure to precise measurements of fundamental constants. However, the contrast of 3% obtained using this moire interferometer was well below the theoretical prediction of 30% using ideal gratings. It is suspected that non-ideal aspects of the phase-gratings was a leading contributor to this deficiency and that phase-gratings needed to be quantitatively assessed and optimized. Here we characterize Neutron diffraction from phase-gratings using Bragg diffraction crystals to determine the optimal phase-grating orientations. We show well-defined diffraction peaks and explore perturbations to the diffraction peaks and the effects on interferometer contrast as a function of grating alignment. This technique promises to improve the contrast of the grating interferometers by providing in-situ aides to grating alignment.The recent development of phase-grating moire Neutron Interferometry promises a wide range of impactful experiments from dark-field imaging of material microstructure to precise measurements of fundamental constants. However, the contrast of 3% obtained using this moire interferometer was well below the theoretical prediction of 30% using ideal gratings. It is suspected that non-ideal aspects of the phase-gratings was a leading contributor to this deficiency and that phase-gratings needed to be quantitatively assessed and optimized. Here we characterize Neutron diffraction from phase-gratings using Bragg diffraction crystals to determine the optimal phase-grating orientations. We show well-defined diffraction peaks and explore perturbations to the diffraction peaks and the effects on interferometer contrast as a function of grating alignment. This technique promises to improve the contrast of the grating interferometers by providing in-situ aides to grating alignment.
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coherence optimization in Neutron Interferometry through defocusing
Physical Review A, 2019Co-Authors: J Nsofini, D Sarenac, David G Cory, D A PushinAbstract:A zero-area four-blade perfect crystal Neutron interferometer (NI) possess a decoherence-free subspace (DFS) for low-frequency mechanical vibrations and thus is easier to site. %has the potential to broaden the application of crystal-based Neutron Interferometry to a higher number of Neutron sources. However, unlike the standard three-blade Mach-Zehnder NI the ideal contrast of this four-blade NI geometry is less than one. By applying a recently introduced quantum information model for dynamical diffraction we show that the contrast for the four-blade DFS NI can be increased by offsetting the focusing condition. The contrast optimization leads to an NI geometry where the distances between the centers of the blades are equidistant. An experiment is proposed to verify the increase in contrast.
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a new polarized Neutron Interferometry facility at the ncnr
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2016Co-Authors: Chandra Shahi, Muhammad Arif, D Sarenac, David G Cory, M G Huber, Taisiya Mineeva, J Nsofini, Carl J Williams, D A PushinAbstract:Abstract A new monochromatic beamline and facility has been installed at the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR) devoted to Neutron Interferometry in the research areas of spin control, spin manipulation, quantum mechanics, quantum information science, spintronics, and material science. This facility is possible in part because of advances in decoherence free subspace interferometer designs that have demonstrated consistent contrast in the presence of vibrational noise; a major environmental constraint that has prevented Neutron Interferometry from being applied at other Neutron facilities. Neutron Interferometry measures the phase difference between a Neutron wave function propagating along two spatially separated paths. It is a practical example of self interference and due to its modest path separation of a few centimeters allows the insertion of samples and macroscopic Neutron spin rotators. Phase shifts can be caused by gravitational, magnetic and nuclear interactions as well as purely quantum mechanical effects making interferometer a robust tool in Neutron research. This new facility is located in the guide hall of the NCNR upstream of the existing Neutron Interferometry and Optics Facility (NIOF) and has several advantages over the NIOF including higher incident flux, better Neutron polarization, and increased accessibility. The long term goal for the new facility is to be a user supported beamline and makes Neutron interferometer more generally available to the scientific community. This paper addresses both the capabilities and characteristics of the new facility.
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Neutron Interferometry at the national institute of standards and technology
Advances in High Energy Physics, 2015Co-Authors: D A Pushin, Muhammad Arif, D Sarenac, M G Huber, Chandra Shahi, J Nsofini, Christopher J Wood, David G CoryAbstract:Neutron Interferometry has proved to be a very precise technique for measuring the quantum mechanical phase of a Neutron caused by a potential energy difference between two spatially separated Neutron paths inside interferometer. The path length inside the interferometer can be many centimeters (and many centimeters apart) making it very practical to study a variety of samples, fields, potentials, and other macroscopic medium and quantum effects. The precision of Neutron Interferometry comes at a cost; Neutron interferometers are very susceptible to environmental noise that is typically mitigated with large, active isolated enclosures. With recent advances in quantum information processing especially quantum error correction (QEC) codes we were able to demonstrate a Neutron interferometer that is insensitive to vibrational noise. A facility at NIST’s Center for Neutron Research (NCNR) has just been commissioned with higher Neutron flux than the NCNR’s older interferometer setup. This new facility is based on QEC Neutron interferometer, thus improving the accessibility of Neutron Interferometry to the greater scientific community and expanding its applications to quantum computing, gravity, and material research.
S. A. Werner - One of the best experts on this subject based on the ideXlab platform.
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observation of berry s geometric phase by Neutron Interferometry
Foundations of Physics, 2012Co-Authors: S. A. WernerAbstract:On the 25th anniversary of Berry’s historic papers on the geometric phase, I discuss here our Neutron Interferometry experiment in which this phase is clearly separated from the dynamical phase. The connection of this experiment to the observation of the sign reversal of the wave function of a fermion during a 2π precession in a magnetic field by three groups independently in 1975 is discussed.
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observation of aharonov bohm effects by Neutron Interferometry
Journal of Physics A, 2010Co-Authors: S. A. Werner, A G KleinAbstract:The special and unique techniques of Neutron Interferometry have been used to observe a number of topological effects. These include the quantum mechanical phase shift of a Neutron due to the Earth's rotation (the quantum analog of the Michelson–Gale–Pearson experiment with light), the phase shift of a particle carrying a magnetic moment (a Neutron) encircling a line charge (the Aharonov–Casher effect) and the scalar Aharonov–Bohm effect, observed with a pulsed magnetic field solenoid and time-of-flight Neutron detection. On the occasion of the 50th anniversary of the Aharonov–Bohm paper, we provide an overview of the Neutron Interferometry technique and a description of these three historic experiments.
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measuring the Neutron s mean square charge radius using Neutron Interferometry
Physica B-condensed Matter, 2006Co-Authors: F E Wietfeldt, H. Kaiser, T. C. Black, David L. Jacobson, Muhammad Arif, M G Huber, S. A. WernerAbstract:Abstract The Neutron is electrically neutral, but its substructure consists of charged quarks so it may have an internal charge distribution. In fact it is known to have a negative mean square charge radius (MSCR), the second moment of the radial charge density. In other words the Neutron has a positive core and negative skin. In the first Born approximation the Neutron MSCR can be simply related to the Neutron–electron scattering length b ne . In the past this important quantity has been extracted from the energy dependence of the total transmission cross-section of Neutrons on high-Z targets, a very difficult and complicated process. A few years ago S.A. Werner proposed a novel approach to measuring b ne from the Neutron's dynamical phase shift in a perfect crystal close to the Bragg condition. We are conducting an experiment based on this method at the NIST Neutron interferometer which may lead to a five-fold improvement in precision of b ne and hence the Neutron MSCR.
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precision Neutron interferometric measurements and updated evaluations of the n p and n d coherent Neutron scattering lengths
Physical Review C, 2003Co-Authors: K Schoen, H. Kaiser, T. C. Black, P.r. Huffman, David L. Jacobson, W. M. Snow, Muhammad Arif, Steve K. Lamoreaux, S. A. WernerAbstract:We have performed high-precision measurements of the coherent Neutron scattering lengths of gas phase molecular hydrogen and deuterium using Neutron Interferometry. After correcting for molecular binding and multiple scattering from the molecule, we find ${b}_{\mathrm{np}}=(\ensuremath{-}3.7384\ifmmode\pm\else\textpm\fi{}0.0020)\mathrm{fm}$ and ${b}_{\mathrm{nd}}=(6.6649\ifmmode\pm\else\textpm\fi{}0.0040)\mathrm{fm}.$ Our results are in agreement with the world average of previous measurements, ${b}_{\mathrm{np}}=(\ensuremath{-}3.7410\ifmmode\pm\else\textpm\fi{}0.0010)\mathrm{fm}$ and ${b}_{\mathrm{nd}}=(6.6727\ifmmode\pm\else\textpm\fi{}0.0045)\mathrm{fm}.$ The new world averages for the $n\ensuremath{-}p$ and $n\ensuremath{-}d$ coherent scattering lengths, including our new results, are ${b}_{\mathrm{np}}=(\ensuremath{-}3.7405\ifmmode\pm\else\textpm\fi{}0.0009)\mathrm{fm}$ and ${b}_{\mathrm{nd}}=(6.6683\ifmmode\pm\else\textpm\fi{}0.0030)\mathrm{fm}.$ We compare ${b}_{\mathrm{nd}}$ with the calculations of the doublet and quartet scattering lengths of several nucleon-nucleon potential models and show that almost all known calculations are in disagreement with the precisely measured linear combination corresponding to the coherent scattering length. Combining the world data on ${b}_{\mathrm{nd}}$ with the modern high-precision theoretical calculations of the quartet $n\ensuremath{-}d$ scattering lengths recently summarized by Friar et al., we deduce a new value for the doublet scattering length of ${}^{2}{a}_{\mathrm{nd}}=[0.645\ifmmode\pm\else\textpm\fi{}0.003(\mathrm{expt})\ifmmode\pm\else\textpm\fi{}0.007(\mathrm{theory})]\mathrm{fm}.$ This value is a factor of 4, more precise than the previously accepted value of ${}^{2}{a}_{\mathrm{nd}}=[0.65\ifmmode\pm\else\textpm\fi{}0.04(\mathrm{expt})]\mathrm{fm}.$ The current state of knowledge of scattering lengths in the related $p\ensuremath{-}d$ system, ideas for improving by a factor of 5 the accuracy of the ${b}_{\mathrm{np}}$ and ${b}_{\mathrm{nd}}$ measurements using Neutron Interferometry, and possibilities for further improvement of our knowledge of the coherent Neutron scattering lengths of ${}^{3}\mathrm{H},$ ${}^{3}\mathrm{He},$ and ${}^{4}\mathrm{He}$ are discussed.
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Neutron Interferometry lessons in experimental quantum mechanics
American Journal of Physics, 2002Co-Authors: H Rauch, S. A. WernerAbstract:1. Introduction 2. Neutron interferometers and apparatus 3. Neutron interactions and the coherent scattering length 4. Coherence properties 5. Spinor symmetry and spin superposition 6. Topological and geometric phases 7. Gravitational, non-inertial, and motional effects 8. Search for speculative effects 9. Solid State physics applications 10. Perfect crystal Neutron optics 11. Interpretational questions 12. References