Publications

Journal publications

• "High resolution neutron Larmor diffraction using superconducting magnetic Wollaston prisms"
  F. Li, H. Feng, A. N. Thaler, S. R. Parnell, W. A. Hamilton, L. Crow, W. Yang, A. B. Jones, H. Bai, M. Matsuda, D. V. Baxter, T. Keller, J. A. Fernandez-Baca, and R. Pynn, Scientific Reports, 7 865 (2017).
• "Grating-based holographic diffraction methods for X-rays and neutrons: phase object approximation and dynamical theory"
  Hao Fengab*, Rana Ashkarc, Nina Steinked, Robert Dalglieshd, Nickolay V. Lavrike, Ivan I. Kravchenkoe and Roger Pynn Submitted to J Appl Cryst

Journal publications

• "Spin echo modulated small angle neutron scattering using superconducting magnetic Wollaston prisms" Fankang Li, Steven R. Parnell , Hongyu Bai, Wencao Yang, William A. Hamilton, Brian B. Maranville, Rana Ashkar, David V. Baxter, J. Ted Cremer and Roger Pynn; J. Appl. Cryst. 49, 55 (2016)
• "Experimental Searches for Neutron-Antineutron Oscillation"
  D. G. Phillips, et al. (NNbarX collaboration), Phys. Rep., 612, 1-45 (2016).
• "Introducing single-crystal scattering and optical potentials into MCNPX: Predicting Neutron Emission from a Convoluted Moderator"
  F. X. Gallmeier, E. B. Iverson, W. Lu, David V. Baxter, G. Muhrer, and S. Ansell, NIMA 814, 39-49 (2016).
• "Materials and Neutronic Research at the Low Energy Neutron Source"
  David V. Baxter, Eur. Phys. J. Plus, 131, 83 (2016).
• "Compact Spherical Neutron Polarimeter using high-Tc YBCO films"
  T. Wang, S. R. Parnell, W. A. Hamilton, F. Li, A. Washington, D. V. Baxter, and R. Pynn, Rev. Sci. Instr. 87, 033901 (2016).
• "Demonstration of a Single-Crystal Reflector-Filter for Enhancing Slow Neutron Beams"
  G. Muhrer, T Schoenfeldt, E. B. Iverson, M. Mocko, D. V. Baxter, T. Huegle, and E. Klinkby, NIMA 830, 454-60 (2016).
• "Porosity of silica St¨ober particles determined by spin-echo small angle neutron scattering"
  S.R.Parnell, A.L.Washington, A.J.Parnell, A.Walsh, R.M.Dalgliesh, F.Li, W.A.Hamilton, S.Prevost, J.P.A.Fairclough, and R.Pynn; Soft Matter 12(21) 4677 (2016).
• "Extrinsic Wrinkling and Single Exfoliated Sheets of Graphene Oxide in Polymer Composites"
  Michael P. Weir, David W. Johnson, Stephen C. Boothroyd, Rebecca C. Savage, Richard L. Thompson, Steven R. Parnell, Andrew J. Parnell, Stephen M. King, Sarah E. Rogers, Karl S. Coleman, and Nigel Clarke Chemistry of Materials, 28(6), (2016), 1698
• "Coassembled nanostructured bioscaffold reduces the expression of proinflammatory cytokines to induce apoptosis in epithelial cancer cells"
  Rui Li, Sivapriya Pavuluri, Kiara Bruggeman, Benjamin M. Long, An- drew J. Parnell, Anne Martel, Steven R. Parnell, Frederick M. Pfeffer, Andrew J.C. Dennison, Kevin R. Nicholas, Colin J. Barrow, David R. Nisbet, Richard J. Williams Nanomedicine: Nanotechnology, Biology, and Medicine 12 (2016)

Conference Proceedings

• "The magnetic optimization and design of a superconducting neutron Wollaston prism"
  F. Li, S. R. Parnell, T. Wang, D. V. Baxter and R. Pynn; presented at the International Conference on Polarized Neutrons in Condensed matter Research meeting in Sydney, Australia (2014); Journal of Physics: Conference Series 711 (2016) 012015.

Journal publications

• Spin Echo Small Angle Scattering (SESANS) using a continuously pumped 3He neutron polarization analyser”
  S. R . Parnell, A. Washington, Ke Li, Y. Yan. P. Stonaha, F. Li, T. Wang, A. Walsh, W. Chen, A. Parnell, P. Fairclough, D. V. Baxter, W. M. Snow, and R. Pynn, Rev. Sci. Instr. 86, 023902 (2015).
• "Thermo-responsive PNIPAM coatings on nanostructured gratings for cell alignment and release"
  M. Zhernenkov, R. Ashkar, H. Feng, O. O. Akintewe, N. D. Gallant, R. Toomey, T. F. Ankner and R. Pynn; ACS Appl. Mater. & Interfaces, 7 (22), pp 11857–11862 (2015)

Conference Proceedings

• "Measurement of the total cross section of heavy water in the 0.1 meV–1 eV energy range at 20 and 50 degrees C"
  J. I. Marquez Damian, J. R. Granada, D. V. Baxter, S. R. Parnell and D. C. Evans Il Nuovo Cimento 38C, 178 (2015).
• "Status report on the Low Energy Neutron Source for 2015"
  D. V. Baxter and T. Rinckel Il Nuovo Cimento 38C, 183 (2015).

Journal publications

• "A new approach for probing matter in periodic nanoconfinements using neutron scattering" R. Ashkar, R. Pynn, R. Dalgliesh, N. V. Lavrik and I. I. Kravchenko; J. Appl. Cryst. (2014). 47, 1367-1373.
• "Enhancing neutron beam production with a convoluted moderator"
  E.B. Iverson, D.V. Baxter, G. Muhrer, S. Ansell, R. Dalgliesh, F.X. Gallmeier, H. Kaiser, W. Lua; Nuclear Instruments and Methods A Volume 762, 21 Oct 2014, Pages 31-41.
• "Optimization of a solid state polarizing bender for cold neutrons"
  V.R. Shaha, A.L. Washington, P. Stonahaa, R. Ashkara, H. Kaisera, T. Kristb, R. Pynn; Nuclear Instruments and Methods A Volume 768, 21 Dec 2014, Pages 157-163.
• "Non-uniform transmission of supermirror devices for neutron polarization"
  X. Tong, JL. Robertson and R. Pynn; Nuclear Instruments and Methods A Volume 768, 21 Dec 2014, Pages 77-83.
• "A novel neutron spin echo technique for measuring phonon linewidths using magnetic Wollaston prisms" F. Li and R. Pynn; J. Appl. Cryst. (2014). 47, 1849-1854.
• "Inter-particle Correlations in a Hard-Sphere Colloidal Suspension with Polymer Additives Investigated by Spin Echo Small Angle Neutron Scattering (SESANS)" A. L. Washington, X. Li, A. B. Schofield, K. Hong, M. R. Fitzsimmons, R. Dalgliesh and R. Pynn; Soft Matter, 10 (17), 3016 (2014) – 3026.
• "Superconducting magnetic Wollaston prism for neutron spin encoding"
  F. Li, S. R. Parnell, W. A. Hamilton, B. B. Maranville, T. Wang, R. Semerad, D. V. Baxter, J. T. Cremer, and R. Pynn; Review of Scientific Instruments 85, 053303 (2014).
• "Lifetime behaviour and polarization stability in 3He neutron spin filter cells"
  S Boag, C Y Jiang, X Tong and S R Parnell; International Workshop on Neutron Optics and Detectors (NOP&D 2013).
• "Neutron spin manipulation devices using YBCO films"
  T Wang, F Li, S R Parnell, W A Hamilton, H Kaiser, A L Washington, D V Baxter and R Pynn; International Workshop on Neutron Optics and Detectors (NOP&D 2013).

2014 International Collaboration on Advanced Neutron Sources (ICANS)

• "Status Report on the Low Energy Neutron Source – 2014"
  David V. Baxter, F. Li, S. R. Parnell, R. Pynn, T. Rinckel, and T. Wang; presented at ICANS XX (Mito, Japan), 2014.

2014 ICPNCR

• "The magnetic optimization and design of a superconducting neutron Wollaston prism"
  F. Li, S. R. Parnell, T. Wang, D. V. Baxter and R. Pynn; presented at the International Conference on Polarized Neutrons in Condensed matter Research meeting in Sydney, Australia (2014); Journal of Physics: Conference Series 711 (2016) 012015.

Journal publications

• "DCD USANS and SESANS: a comparison of two neutron scattering techniques applicable for the study of large-scale structures"
  J. Appl. Cryst. (2013). 46, 354-364.
• "Photophysics and morphology of a polyfluorene donor–acceptor triblock copolymer for solar cells"
  Journal of Polymer Science Part B: Polymer Physics Journal Volume 51 Issue 23 Pages 1705-1718 2013.
• "Performance of a polarised neutron cryo-flipper using a high TcYBCO film"
  Nuclear Instruments and Methods A Volume 722, 11 September 2013, Pages 20–23.
• "Design of a Cryogen Free Cryo-flipper using a High Tc YBCO Film"
  Physics Procedia 42 (2013) 125.
• "Neutron Spin Evolution through Broadband Current Sheet Spin Flippers"
  P.Stonaha, J. Hendrie, W. T. Lee, and Roger Pynn, Rev. Sci. Instrum. 84, 105113 (2013).

2013 Conference Proceedings

• "Design of a cryogen-free cryo-flipper using a high Tc YBCO film"
  S. R. Parnell, H. Kaiser, A. L. Washington, F. Li, T. Wang, D. Baxter and R. Pynn; presented at the Int. Conf. on Polarized Neutrons In Condensed Matter Investigations, Paris, 2012; Physics Procedia 42, 125 (2013).

Journal publications

• “Shape and Size of Highly Concentrated Micelles in CTAB/NaSaI Solutions by Small Angle Neutron Scattering (SANS)”
  Langmuir 28 (33), 11962-11968 (2012)
• "Contrast Variation in spin-echo small angle neutron scattering"
  Xin Li, Bin Wu, Roger Pynn, Chwen-Yang Shew, Gregory S. Smith, Kenneth W. Herwig, J. Lee Robertson, Wei-Ren Chen, and Li Liu; Journal of Physics: Condensed Matter 24, 064115 (2012).

2012 International Collaboration on Advanced Neutron Sources (ICANS)

• Facility report on the Low Energy Neutron Source
• https://ceem.indiana.edu/doc/lens/publication-2012-facility-report-on-lens.pdf
• Characterization of a Directionally Enhanced Moderator
• Superconducting YBCO Wollaston Prism for Spin Echo Scattering Angle Measurement
• Design and performance of a cryo-flipper using a YBCO film
• Design of Next Generation Magnetic Wollaston Prisms for use in Spin Echo Scattering Angle Measurement (SESAME)

Journal publications

• "A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass"
  NIM B 269, 425-30 (2011)
• "Size and Spatial Distribution of Micropores in SBA-15 using CM-SANS"
  Rachel A. Pollock, Brenna R. Walsh, Jason Fry, I. Tyrone Ghampson, Yuri B. Melinchenko, Helmut Kaiser, Roger Pynn, William J. DeSisto, M. Clayton Wheeler and Brian G. Frederick; Chem. Mater., 23, 3828, (2011).
• "Prospect for characterizing interacting soft colloidal structures using spin-echo small angle neutron scattering"
  Xin Li, Chwen-Yang Shew, Yun Liu, Roger Pynn, Emily Liu, Kenneth W. Herwig, Gregory S. Smith, J. Lee Robertson, and Wei-Ren Chen; J. Chem. Phys., 134, 094504 (2011).
• "Comparison of dynamical theory and the phase-object approximation for neutron scattering from periodic structures"
  Rana Ashkar, V. O. deHaan, A. A. VanWell, R. Dalgliesh, J. Plomp, M. R. Fitzsimmons, W. L. Schaich and Roger Pynn; J. Appl. Cryst., 44, 958 (2011).

2011 International Collaboration on Advanced Neutron Sources (ICANS)

• Neutron Moderator Development Research at the Low Energy Neutron Source
• Moderators at LENS: Performance and Development Research
• Neutron energy spectrum characterization on TMR-1 at the Indiana University neutron source
• LENS Operating Experience
• Target Performance at the Low Energy Neutron Source
• A Neutron Diffractometer for a Long Pulsed Neutron Source

2011 International Topical Meeting on Nuclear Applications of Accelerators (ACCAPP)

• The Low Energy Neutron Source at Indiana University

Other Documents from 2011

• "A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass: NIM_B 269 (2011) 425"
  Some recent results using spin echo resolved grazing incidence scattering (SERGIS)
  Roger Pynn, Rana Ashkar, P.Stonaha, A.L.Washington; presented at Polarized Neutrons in Condensed Matter Investigation (PNCMI), Delft, (2010); Physica B406, 2350 (2011).
• "Dynamical Theory: Application to Spin-Echo Resolved Grazing Incidence Scattering from Periodic Structures"
  Rana Ashkar, W. L. Schaich, V. O deHaan, A. A. VanWell, R. Dalgliesh, J. Plomp, and Roger Pynn; presented at the Int. Conf. on Surface X-Ray and Neutron Scattering (SXNS11); J. Appl. Phys. 110,102201 (2011).

Journal publications

• "Measurements of the neutron brightness from a phase II solid methane moderator at the LENS neutron source"
  NIM A 620, 375-391 (2010).
• "Microscopic Model for the Neutron Dynamic Structure Factor of Solid Methane in Phase II"
  NIM A 620, 382-390 (2010).
• "Theoretical studies on the structure of interacting colloid suspensions by spin echo small angle scattering"
  X. Li, C-Y Shew, Y. Liu, R. Pynn, E. Liu, K. W. Herwig, G. S. Smith, J. L. Robinson, and W-R Chen; J. Chem. Phys., 132, 174509 (2010).
• Dynamical theory calculations of spin-echo resolved grazing-incidence scattering from a diffraction grating"
  R. Ashkar, P. Stonaha, A. L. Washington, V. R Shah, M. R. Fitzsimmons, B. Maranville, C. F. Majkrzak, W. T. Lee, W. L. Schaich, and R. Pynn; J. Appl. Cryst., 43, 455 (2010).

2010 International Collaboration on Advanced Neutron Sources (ICANS)

• "Total Cross Section Measurements of H2O and ZrH2 with Very Cold Neutrons"
• "Development of a beam line for spin echo scattering angle measurement at the Low Energy Neutron Source"
  A. L. Washington, P. Stonaha, R. Ashkar, R. Pynn, V. R. Shah; Proceedings of ICANS XIX (Grindelwald, Switzerland, 2010) ISSN-Nr. 1019-6447

2010 International Conference on Neutron Scattering (ICNS)

• "Spin Echo Resolved Grazing Incidence Scattering (SERGIS) at Pulsed and CW Neutron Sources"
  Rana Ashkar, P. Stonaha, A. L. Washington, V. R. Shah, M. R. Fitzsimmons, B. Maranville, C. F. Majkrzak, and Roger Pynn; presented at the International Conference on Neutron Scattering (2009); J. Phys.: Conf. Ser. 251, 012066 (2010).

Journal publications

• "A spin-echo resolved grazing incidence scattering setup for the neutron interrogation of buried nanostructures"
  J. Major, A. Vorobiev, A. Ruehm, R. Maier, M. Major, M. Mezger, M. Nuelle, H. Dosch, G. P. Felcher, P. Falus, T. Keller, R. Pynn, Rev. Sci. Instrum. 80, 123903 (2009).

2009 Particle Accelerator Conference (PAC)

• "Spin Echo Scattering Angle Measurement at a Pulsed Neutron Source"
  Roger Pynn, M. R. Fitzsimmons, W. T. Lee, V. R. Shah, A. L. Washington, P. Stonaha, and K. Littrell; J. Appl. Cryst.,41, 897 (2008).

Journal publications

• "Neutronic Design and Measured Performance of the Low Energy Neutron Source Target Moderator Reflector System"
  NIM A 587, 324-341 (2008).
• "The Use of Symmetry to Correct Larmor Phase Aberrations in Spin Echo Scattering Angle Measurement"
  Roger Pynn, Wai-Tung Hal Lee, Paul Stonaha, Shah Valloppilly, Adam Washington, Brian Kirby, Brian Maranville, and Charles Majkrzak; Rev. Sci. Instrum. 79, 063901 (2008).
• "Spin Echo Scattering Angle Measurement at a Pulsed Neutron Source" Roger Pynn, M. R. Fitzsimmons, W. T. Lee, V. R. Shah, A. L. Washington, P. Stonaha, and K. Littrell; J. Appl. Cryst.,41, 897 (2008).

Journal publications

• "LENS: A New University-based Neutron Source for Science and Education"

2007 International Collaboration on Advanced Neutron Sources (ICANS)

• "The Present Status of the Low Energy Neutron Source"

2006 International Collaboration on Advanced Neutron Sources (ICANS)

• "The Low Energy Neutron Source-Status and Prospects"

2006 Nuclear and Space Radiation Effects Conference (NSREC)

• "The Neutron Radiation Effects Program (NREP) at Indiana University Cyclotron Facility"

2006 Linear Particle Accelerator (LINAC)

• "Construction Plans for the LENS Proton LINAC"

Journal publications

• "Status of the low energy neutron source at Indiana University"

2005 International Collaboration on Advanced Neutron Sources (ICANS)

• Neutronic Performance of the LENS TMR
• The Low Energy Neutron Source - Status and Prospects
• Neutronic Measurements to Commission the SNS
• Spectral Intensity Benchmarking on the IPNS Beamlines
• Phase II Solid Methane Scattering Kernel with Comparison to LENS Energy Spectrum Measurement