@article{heacock_fujiie_haun_henins_hirota_hosobata_huber_kitaguchi_pushin_shimizu_et al._2021, title={Pendellosung interferometry probes the neutron charge radius, lattice dynamics, and fifth forces}, volume={373}, ISSN={1095-9203}, DOI={10.1126/science.abc2794}, abstractNote={Setting bounds on a fifth force}, number={6560}, journal={SCIENCE}, author={Heacock, Benjamin and Fujiie, Takuhiro and Haun, Robert W. and Henins, Albert and Hirota, Katsuya and Hosobata, Takuya and Huber, Michael G. and Kitaguchi, Masaaki and Pushin, Dmitry A. and Shimizu, Hirohiko and et al.}, year={2021}, month={Sep}, pages={1239–1243} }
 @article{heacock_sarenac_cory_huber_maclean_miao_wen_pushin_2020, title={Neutron sub-micrometre tomography from scattering data}, volume={7}, ISSN={["2052-2525"]}, DOI={10.1107/S2052252520010295}, abstractNote={Neutrons are valuable probes for various material samples across many areas of research. Neutron imaging typically has a spatial resolution of larger than 20 µm, whereas neutron scattering is sensitive to smaller features but does not provide a real-space image of the sample. A computed-tomography technique is demonstrated that uses neutron-scattering data to generate an image of a periodic sample with a spatial resolution of ∼300 nm. The achieved resolution is over an order of magnitude smaller than the resolution of other forms of neutron tomography. This method consists of measuring neutron diffraction using a double-crystal diffractometer as a function of sample rotation and then using a phase-retrieval algorithm followed by tomographic reconstruction to generate a map of the sample's scattering-length density. Topological features found in the reconstructions are confirmed with scanning electron micrographs. This technique should be applicable to any sample that generates clear neutron-diffraction patterns, including nanofabricated samples, biological membranes and magnetic materials, such as skyrmion lattices.}, journal={IUCRJ}, author={Heacock, B. and Sarenac, D. and Cory, D. G. and Huber, M. G. and MacLean, J. P. W. and Miao, H. and Wen, H. and Pushin, D. A.}, year={2020}, month={Sep}, pages={893–900} }
 @article{haun_wietfeldt_arif_huber_black_heacock_pushin_shahi_2020, title={Precision Measurement of the Neutron Scattering Length of He-4 Using Neutron Interferometry}, volume={124}, ISSN={["1079-7114"]}, DOI={10.1103/PhysRevLett.124.012501}, abstractNote={We report a 0.08% measurement of the bound neutron scattering length of ^{4}He using neutron interferometry. The result is b=(3.0982±0.0021[stat]±0.0014[syst])  fm. The corresponding free atomic scattering length is a=(2.4746±0.0017[stat]±0.0011[syst])  fm. With this result the world average becomes b=(3.0993±0.0025)  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.}, number={1}, journal={PHYSICAL REVIEW LETTERS}, author={Haun, R. and Wietfeldt, F. E. and Arif, M. and Huber, M. G. and Black, T. C. and Heacock, B. and Pushin, D. A. and Shahi, C. B.}, year={2020}, month={Jan} }
 @article{heacock_sarenac_cory_huber_hussey_kapahi_miao_wen_pushin_2019, title={Angular alignment and fidelity of neutron phase-gratings for improved interferometer fringe visibility}, volume={9}, ISSN={["2158-3226"]}, DOI={10.1063/1.5099341}, abstractNote={The recent development of phase-grating moiré 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 moiré 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.}, number={8}, journal={AIP ADVANCES}, author={Heacock, B. and Sarenac, D. and Cory, D. G. and Huber, M. G. and Hussey, D. S. and Kapahi, C. and Miao, H. and Wen, H. and Pushin, D. A.}, year={2019}, month={Aug} }
 @article{heacock_haun_hirota_hosobata_huber_jamer_kitaguchi_pushin_shimizu_taminiau_et al._2019, title={Measurement and alleviation of subsurface damage in a thick-crystal neutron interferometer}, volume={75}, ISBN={2053-2733}, DOI={10.1107/S2053273319011604}, abstractNote={The construction is described of a monolithic thick-crystal perfect silicon neutron interferometer using an ultra-high-precision grinding technique and a combination of annealing and chemical etching that differs from the construction of prior neutron interferometers. The interferometer is the second to have been annealed after machining and the first to be annealed prior to chemical etching. Monitoring the interference signal at each post-fabrication step provides a measurement of subsurface damage and its alleviation. In this case, the strain caused by subsurface damage manifests itself as a spatially varying angular misalignment between the two relevant volumes of the crystal and is reduced from ∼10−5 rad to ∼10−9 rad by way of annealing and chemical etching.}, journal={ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES}, author={Heacock, Benjamin and Haun, Robert and Hirota, Katsuya and Hosobata, Takuya and Huber, Michael G. and Jamer, Michelle E. and Kitaguchi, Masaaki and Pushin, Dmitry A. and Shimizu, Hirohiko and Taminiau, Ivar and et al.}, year={2019}, month={Nov}, pages={833–841} }
 @article{sarenac_clark_cory_kapahi_heacock_huber_nsofini_shahi_pushin_2019, title={Structured neutron waves}, volume={10934}, ISSN={["1996-756X"]}, DOI={10.1117/12.2515469}, abstractNote={Emerging quantum materials are becoming the building blocks for quantum devices and they are enabling new advances from spintronics to topological insulators. Their functionality typically comes from their inner magnetic field structure. Neutrons are a particularly good probe to characterize such features. The control of neutron orbital angular momentum and the spin-orbit interaction enables new characterizing techniques and increased sensitivity towards specific material properties. Here we review the preparation and characterization methods of structured neutron waves.}, journal={OPTICAL, OPTO-ATOMIC, AND ENTANGLEMENT-ENHANCED PRECISION METROLOGY}, author={Sarenac, Dusan and Clark, Charles W. and Cory, David G. and Kapahi, Connor and Heacock, Benjamin and Huber, Michael G. and Nsofini, Joachim and Shahi, Chandra B. and Pushin, Dmitry A.}, year={2019} }
 @article{heacock_arif_cory_gnaeupel-herold_haun_huber_jamer_nsofini_pushin_sarenac_et al._2018, title={Increased interference fringe visibility from the post-fabrication heat treatment of a perfect crystal silicon neutron interferometer}, volume={89}, number={2}, journal={Review of Scientific Instruments}, author={Heacock, B. and Arif, M. and Cory, D. G. and Gnaeupel-Herold, T. and Haun, R. and Huber, M. G. and Jamer, M. E. and Nsofini, J. and Pushin, D. A. and Sarenac, D. and et al.}, year={2018} }
 @article{sarenac_pushin_huber_hussey_miao_arif_cory_cronin_heacock_jacobson_et al._2018, title={Three Phase-Grating Moire Neutron Interferometer for Large Interferometer Area Applications}, volume={120}, ISSN={["1079-7114"]}, DOI={10.1103/physrevlett.120.113201}, abstractNote={We demonstrate a three phase-grating moiré neutron interferometer in a highly intense neutron beam as a robust candidate for large area interferometry applications and for the characterization of materials. This novel far-field moiré technique allows for broad wavelength acceptance and relaxed requirements related to fabrication and alignment, thus circumventing the main obstacles associated with perfect crystal neutron interferometry. We observed interference fringes with an interferometer length of 4 m and examined the effects of an aluminum 6061 alloy sample on the coherence of the system. Experiments to measure the autocorrelation length of samples and the universal gravitational constant are proposed and discussed.}, number={11}, journal={PHYSICAL REVIEW LETTERS}, author={Sarenac, D. and Pushin, D. A. and Huber, M. G. and Hussey, D. S. and Miao, H. and Arif, M. and Cory, D. G. and Cronin, A. D. and Heacock, B. and Jacobson, D. L. and et al.}, year={2018}, month={Mar} }
 @article{sanaeifar_rabiee_abdolrahim_tahriri_vashaee_tayebi_2017, title={A novel electrochemical biosensor based on Fe3O4 nanoparticles-polyvinyl alcohol composite for sensitive detection of glucose}, volume={519}, ISSN={1096-0309}, url={http://dx.doi.org/10.1016/j.ab.2016.12.006}, DOI={10.1016/j.ab.2016.12.006}, abstractNote={In this research, a new electrochemical biosensor was constructed for the glucose detection. Iron oxide nanoparticles (Fe3O4) were synthesized through co-precipitation method. Polyvinyl alcohol-Fe3O4 nanocomposite was prepared by dispersing synthesized nanoparticles in the polyvinyl alcohol (PVA) solution. Glucose oxidase (GOx) was immobilized on the PVA-Fe3O4 nanocomposite via physical adsorption. The mixture of PVA, Fe3O4 nanoparticles and GOx was drop cast on a tin (Sn) electrode surface (GOx/PVA-Fe3O4/Sn). The Fe3O4 nanoparticles were characterized by X-ray diffraction (XRD). Also, Fourier transform infrared (FTIR) spectroscopy and field emission scanning electron microscopy (FE-SEM) techniques were utilized to evaluate the PVA-Fe3O4 and GOx/PVA-Fe3O4 nanocomposites. The electrochemical performance of the modified biosensor was investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Presence of Fe3O4 nanoparticles in the PVA matrix enhanced the electron transfer between enzyme and electrode surface and the immobilized GOx showed excellent catalytic characteristic toward glucose. The GOx/PVA-Fe3O4/Sn bioelectrode could measure glucose in the range from 5 × 10-3 to 30 mM with a sensitivity of 9.36 μA mM-1 and exhibited a lower detection limit of 8 μM at a signal-to-noise ratio of 3. The value of Michaelis-Menten constant (KM) was calculated as 1.42 mM. The modified biosensor also has good anti-interfering ability during the glucose detection, fast response (10 s), good reproducibility and satisfactory stability. Finally, the results demonstrated that the GOx/PVA-Fe3O4/Sn bioelectrode is promising in biosensor construction.}, journal={ANALYTICAL BIOCHEMISTRY}, publisher={Elsevier BV}, author={Sanaeifar, Niuosha and Rabiee, Mohammad and Abdolrahim, Mojgan and Tahriri, Mohammadreza and Vashaee, Daryoosh and Tayebi, Lobat}, year={2017}, month={Feb}, pages={19–26} }
 @article{heacock_arif_haun_huber_pushin_young_2017, title={Neutron interferometer crystallographic imperfections and gravitationally induced quantum interference measurements}, volume={95}, ISSN={2469-9934}, DOI={10.1103/physreva.95.013840}, abstractNote={Dynamical diffraction leads to an interesting, unavoidable set of interference effects for neutron interferometers. This experiment studies the interference signal from two and three successive Bragg diffractions in the Laue geometry. We find that intrinsic Bragg-plane misalignment in monolithic, ``perfect'' silicon neutron interferometers is relevant between successive diffracting crystals, as well as within the Borrmann fan for typical interferometer geometries. We show that the dynamical phase correction employed in the Colella, Overhauser, and Werner gravitationally induced quantum interference experiments is attenuated by slight, intrinsic misalignments between diffracting crystals, potentially explaining the long-standing 1% discrepancy between theory and experiment. This systematic may also impact precision measurements of the silicon structure factor, affecting previous and future measurements of the Debye-Waller factor and neutron-electron scattering length as well as potential fifth-force searches. For the interferometers used in this experiment, Bragg planes of different diffracting crystals were found to be misaligned by 10 to 40 nrad.}, number={1}, journal={PHYSICAL REVIEW A}, author={Heacock, B. and Arif, M. and Haun, R. and Huber, M. G. and Pushin, D. A. and Young, A. R.}, year={2017}, month={Jan} }
 @article{sarenac_huber_heacock_arif_clark_cory_shahi_pushin_2016, title={Holography with a neutron interferometer}, volume={24}, number={20}, journal={Optics Express}, author={Sarenac, D. and Huber, M. G. and Heacock, B. and Arif, M. and Clark, C. W. and Cory, D. G. and Shahi, C. B. and Pushin, D. A.}, year={2016}, pages={22528–22535} }
 @article{li_arif_cory_haun_heacock_huber_nsofini_pushin_saggu_sarenac_et al._2016, title={Neutron limit on the strongly-coupled chameleon field}, volume={93}, ISSN={2470-0010 2470-0029}, url={http://dx.doi.org/10.1103/PhysRevD.93.062001}, DOI={10.1103/physrevd.93.062001}, abstractNote={The physical origin of the dark energy that causes the accelerated expansion rate of the Universe is one of the major open questions of cosmology. One set of theories postulates the existence of a self-interacting scalar field for dark energy coupling to matter. In the chameleon dark energy theory, this coupling induces a screening mechanism such that the field amplitude is nonzero in empty space but is greatly suppressed in regions of terrestrial matter density. However measurements performed under appropriate vacuum conditions can enable the chameleon field to appear in the apparatus, where it can be subjected to laboratory experiments. Here we report the most stringent upper bound on the free neutron-chameleon coupling in the strongly coupled limit of the chameleon theory using neutron interferometric techniques. Our experiment sought the chameleon field through the relative phase shift it would induce along one of the neutron paths inside a perfect crystal neutron interferometer. The amplitude of the chameleon field was actively modulated by varying the millibar pressures inside a dual-chamber aluminum cell. We report a 95% confidence level upper bound on the neutron-chameleon coupling β ranging from β < 4.7 × 106 for a Ratra-Peebles index of n = 1 in the nonlinear scalar field potential to β < 2.4 × 107 for n = 6, one order of magnitude more sensitive than the most recent free neutron limit for intermediate n. Similar experiments can explore the full parameter range for chameleon dark energy in the foreseeable future.}, number={6}, journal={Physical Review D}, publisher={American Physical Society (APS)}, author={Li, K. and Arif, M. and Cory, D. G. and Haun, R. and Heacock, B. and Huber, M. G. and Nsofini, J. and Pushin, D. A. and Saggu, P. and Sarenac, D. and et al.}, year={2016}, month={Mar} }
 @inproceedings{snow_arif_heacock_huber_li_pushin_skavysh_young_2015, title={A sensitive search for dark energy through chameleon scalar fields using neutron interferometry}, volume={578}, booktitle={Xxxvii symposium on nuclear physics}, author={Snow, W. M. and Arif, M. and Heacock, B. and Huber, M. and Li, K. and Pushin, D. and Skavysh, V. and Young, A. R.}, year={2015} }
 @inproceedings{pantic_heacock_lukic_2012, title={Magnetic link optimization for wireless power transfer applications: modeling and experimental validation for resonant tubular coils}, booktitle={2012 IEEE Energy Conversion Congress and Exposition (ECCE)}, author={Pantic, Z. and Heacock, B. and Lukic, S.}, year={2012}, pages={3825–3832} }