Recent Publications

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Recent Publications

B. Ayaz-Maierhafer, J.P. Hayward, K.P. Ziock, M.A. Blackston, L. Fabris, “AngularResolution Study of a Combined Gamma and Neutron Coded Aperture Imager forStandoff Detection,” submitted to Nuclear Instruments and Methods in Physics ResearchA, September 2012. [Role: Sole PI, supervisor of first author]Refereed proceedingsJ.W. Cates, J.P. Hayward, X. Zhang, “Timing Resolution of Single Crystalline ZnO:GaFilms for Associated Particle Detector Application,” IEEE Nuclear Science Symposium,N30-6, Anaheim, CA, 2012. [Role: Sole PI, Major Professor to first author]J.W. Cates, J.P. Hayward, X. Zhang, M. Laubach, “Parametric Study of Digital SiliconPhotomultiplier Arrays for Optimized Timing Performance,” IEEE Nuclear ScienceSymposium, N1-214, Anaheim, CA, 2012. [Role: Sole PI, Major Professor to firstauthor]J.P. Hayward, B. Ayaz-Maierhafer, L. Fabris, J. Newby, B. Dabbs, J.E. Sparger, P.A.Hausladen, M.A. Blackston, K.P. Ziock, “Dual Gamma-Ray and Fast Neutron Imagingfor Mobile, Standoff Detection of Nuclear Threat Sources,” IEEE Nuclear ScienceSymposium, N8-5, Anaheim, CA 2012. [Role: Sole PI]K.P. Ziock, C.B. Boehnen, J.M. Ernst, L. Fabris, J.P. Hayward, V.C. Paquit, D.R.Patlolla, “Motion Correction for Passive Radiation Imaging of Small Vessels in Ship-to-Ship Inspections,” IEEE Nuclear Science Symposium, N8-8, Anaheim, CA, 2012. [Role:Participant]X. Zhang, J.W. Cates, J.P. Hayward, P.A. Hausladen, “Characterizing the NewGeneration Associated Alpha-Particle Detector with High Spatial and Timing Resolutionfor a D-T Neutron Generator,” IEEE Nuclear Science Symposium, N29-6, Anaheim, CA,2012. [Role: Sole PI, Supervisor of first author]A.L. Swift, B.R. Grogan, J.A. Mullens, J.P. Hayward, J.T. Mihalczo, “Attributes fromNMIS Time Coincidence, Fast Neutron Imaging, Fission Mapping, and Gamma-RaySpectrometry Data,” Proceedings of 53 rd Institute for Nuclear Materials ManagementAnnual Meeting, Orlando, FL, July 2012. [Role: Major Professor to first author]C.R. Lillard, J.P. Hayward, M.R. Williamson, “High Accuracy U-235 EnrichmentVerification Station for Low Enriched Uranium Alloys,” Proceedings of 53 rd Institute forNuclear Materials Management Annual Meeting, Orlando, FL, July 2012. [Role: MajorProfessor to first author]M.A. Laubach, X. Zhang, J.P. Hayward, J.E. Sparger, J.W. Cates, “Simulations of theTiming and Position Response of Neutron Block Detectors for Imaging of NuclearMaterials,” 2012 Symposium on Radiation Measurements and Applications (SORMA),Berkeley, CA, May 2012. [Role: Major Professor to first author, Sole PI]


B. Ayaz-Maierhafer, J.P. Hayward, Z.W. Bell, L.A. Boatner, R.E. Johnson,“Measurements of Thermal Neutron Response in Cherenkov Glasses Designed for MeVPhoton Detection,” 2012 Symposium on Radiation Measurements and Applications(SORMA), Berkeley, CA, May 2012. [Role: Sole PI]A.K. Barnett, L. Crow, Y. Diawara, L.L. Funk, J.P. Hayward, K. Menhard, V.N. Sedov,“A High Count Rate Beam Monitor for Thermal Neutrons,” 2012 Symposium onRadiation Measurements and Applications (SORMA), Berkeley, CA, May 2012. [Role:Major Professor to first author]B. Dabbs, J.P. Hayward, L. Fabris, J. Newby, P.A. Hausladen, “Local Area FastNeutron Background Measurements for Assessment of Standoff Detection Benefit,” 2012Symposium on Radiation Measurements and Applications (SORMA), Berkeley, CA,May 2012. [Role: Major Professor to first author, Sole PI]J.W. Cates, J.P. Hayward, X. Zhang, “Increased Light Extraction from InorganicScintillators with Laser-Etched Microstructures,” 2012 Symposium on RadiationMeasurements and Applications (SORMA), Berkeley, CA, May 2012. [Role: MajorProfessor to first author, Sole PI]J.W. Cates, J.P. Hayward, X. Zhang, P. Hausladen, B. Dabbs, “Timing Resolution Studyof an Associated Particle Detector for Fast Neutron Imaging,” IEEE Nuclear ScienceSymposium in Valencia, Spain, Oct. 2011. [Role: Major Professor to first author, Sole PI]J.P. Hayward, Z.W. Bell, L.A. Boatner, R. Johnson, C.L. Hobbs, J.O. Ramey, G.E.Jellison Jr., “Simulated Response of Cherenkov Glass Detectors to 6 MeV Photons,”IEEE Nuclear Science Symposium in Valencia, Spain, Oct. 2011. [Role: Sole PI]X. Zhang, J.P. Hayward, J.W. Cates, P.A. Hausladen, M.A. Laubach, J.E. Sparger, S.B.Donnald, “Study of the D-T Generator Associated Alpha-Particle Detector with Geant4,”IEEE Nuclear Science Symposium in Valencia, Spain, Oct. 2011. [Role: Sole PI,supervisor of first author]J.P. Hayward, M.A. Blackston, K.P. Ziock, P.A. Hausladen, B. Ayaz-Maierhafer, L.Fabris, M. Squillante, “System-level Simulations for Dual Gamma Ray and NeutronImaging and Spectroscopy,” IEEE Nuclear Science Symposium in Valencia, Spain, Oct.2011. [Role: Sole PI]E.D. Ellis, J.P. Hayward, Y. Diawara, R. Cooper, L. Clonts, N. Donahue, B. Hannon, J.Richards, T. Visscher, C. Montcalm, “Development of a Position-Sensitive ThermalNeutron Detector for Large Area Coverage in Inelastic Scattering Instruments,” IEEENuclear Science Symposium in Valencia, Spain, Oct. 2011. [Role: Major Professor offirst author.]


B. Ayaz-Maierhafer, J.P. Hayward, M.A. Blackston, K.P. Ziock, L. Fabris, “Mask PlaneSimulations for a Compact, Dual Neutron / Gamma Imager,” IEEE Nuclear ScienceSymposium in Valencia, Spain, Oct. 2011. [Role: Sole PI, supervisor of first author]B. Ayaz-Maierhafer, J.P. Hayward, M.A. Blackston, K.P. Ziock, L. Fabris, “AngularResolution Study for a Gamma-Ray Coded Aperture Imager,” IEEE Nuclear ScienceSymposium in Valencia, Spain, Oct. 2011. [Role: Sole PI, supervisor of first author]C.L. Wang, L.G. Clonts, R.G. Cooper, M.L. Crow, Y. Diawara, E.D. Ellis, L. Funk, W.Hannan, J.P. Hodges, J.D. Richards, R.A. Riedel, J.P. Hayward, H.E. Workman, and C.Kline, “Wavelength-Shifting-Fiber Scintillation Detectors for Thermal Neutron Imagingat SNS,” Proceedings of IEEE Nuclear Science Symposium, Valencia, Spain, Oct. 2011.[Role: Participant]B.T. Dabbs, J.P. Hayward, K.P. Ziock, C.B. Boehnen, J.S. Bogard, A.C. Raffo-Caiado,“Characterization of the Imaging Performance of a Portable, Coded-Aperture, Gamma-Ray Imager for Use in Enrichment Plants,” Proceedings of 52 nd INMM Annual Meeting,Palm Desert, CA, July 2011. [Role: Major Professor to first author]K. Pena, S. McConchie, J. Crye, J.P. Hayward, J. Mihalczo, “Active InterrogationObservables for Enrichment Determination of DU Shielded HEU Metal Assemblies withLimited Geometrical Information,” Proceedings of 52 nd INMM Annual Meeting, PalmDesert, CA, July 2011. [Role: Major Professor of first author.]B.T. Dabbs, J.P. Hayward, K.P. Ziock, C.B. Boehnen, J.S. Bogard, A.C. Raffo-Caiado,“Characterization of the Imaging Performance of a Portable, Coded-Aperture, Gamma-Ray Imager for Use in Enrichment Plants,” Proceedings of European SafeguardsResearch and Development Association (ESARDA), Budapest, Hungary, May 2011.[Role: Major Professor of first author.]B. Ayaz-Maierhafter, J.P. Hayward, L.A. Boatner, Z.W. Bell, J.O. Ramey, R.E.Johnson, C.L. Hobbs, G.E. Jellison, J. Kolopus, “Phosphate Glasses for Detection ofPenetrating Radiation via the Cherenkov Effect,” Materials Research Society (MRS)Annual Meeting, Apr. 2011. [Role: Sole PI, supervisor of first author]C.L. Hobbs, J.P. Hayward, Z.W. Bell, L.A. Boatner, J.O. Ramey, G.E. Jellison, B.Rangarajan, “Response Measurements for Cherenkov Glass Samples Using IsotopicGamma Sources,” IEEE Nuclear Science Symposium, Knoxville, TN, November 2010.[Role: Major Professor to first author, Sole PI]A. C. Raffo-Caiado, K-P. Ziock, J. P. Hayward, S. E. Smith, J. S. Bogard, C. B.Boehnen, J. Gonçalves, V. Sequeira, David Puig, O. Peixoto, S. Almeida, O. Calzetta,“Combining Measurements with Three-Dimensional Laser Scanning System and CodedAperture Gamma-Ray Imaging System for International Safeguards Applications.” 2010IAEA Symposium on International Safeguards, Vienna, Austria, November 2010. [Role:Participant]


K.P. Ziock, C. Boehnen, J.P. Hayward, A.C. Raffo-Caiado, “A mechanically-cooled,highly-portable, HPGe-based, coded-aperture gamma-ray imager,” Proc. of 51 st INMMAnnual Meeting, Baltimore, MD, July 2010. [Role: Participant]K. Pena, S. McConchie, J.P. Hayward, J. Mihalczo, “Prompt Neutron Decay Time inSingle HEU and DU Metal Annual Storage Castings,” Proc. of 51 st INMM AnnualMeeting, Baltimore, MD, July 2010. [Role: Major Professor of first author.]A.C. Raffo-Caiado, K.P. Ziock, J.P. Hayward, S. Smith, J. Bogard, and C. Boehnen,“Combining Measurements with Three-Dimensional Laser Scanning System and Coded-Aperture Gamma-Ray Imaging Systems for International Safeguards Applications.”Proceedings of 51 st Annual Meeting of the Institute of Nuclear Materials Management(INMM), Baltimore, USA, July 2010. [Role: Participant]E.D. Ellis, J.P. Hayward, L. Clontz, R. Cooper, N. Donahue, B. Hannon, J. Richards, T.Visscher, “Development of a position sensitive neutron detector for large area coveragein inelastic scattering instruments,” 2010 Symposium on Radiation Measurements andApplications (SORMA), Ann Arbor, MI, May 2010. [Role: Major Professor to firstauthor]J.W. Cates, J.P. Hayward, “Measurement of Light Yield Proportionality in ScintillatorSamples Through a Coincidence Technique,” IEEE Nuclear Science Symposium,Orlando, FL, Oct. 2009. [Role: Major Professor to first author, Sole PI]J.P. Hayward, K.P. Ziock, N. Abdul-Jabbar, A. Solodov, J. Carrigan, S.E. Smith, A.C.Raffo-Caiado, “Feasibility study of coded-aperture imaging and 3D-DIV for nuclearmaterials accountancy in enrichment plants,” Proc. of 50 th INMM Annual Meeting,Tucson, AZ, July 2009. [Role: Participant]J. Bevins, J.P. Hayward, J. Mihalczo, “Monte Carlo simulations of passive timecorrelation measurements for monitoring HEU in large storage arrays,” Proc. of 50 thINMM Annual Meeting, Tucson, AZ, July 2009. [Role: Major Professor to first author]B. Goddard, A.L. Thornton, J.P. Hayward, “Mass verification method for samplescontaining uranium, plutonium, and other actinides using an active well coincidencecounter,” Proc. of 50 th INMM Annual Meeting, Tucson, AZ, July 2009. [Role: Summerresearch advisor for first author]A.C. Raffo Caiado, K.P. Ziock, J.P. Hayward, S. Smith, A. Solodov, L. Mihailescu, K.Vetter, A. Dougan, M. Burks, J.G.M. Gonçalves, V. Sequeira, O.J. Peixoto, S. Almeida,E. Galdoz, and G. Renha, Jr. “Investigation of Combined Measurements with Three-Dimensional Design Information Verification System and Gamma-Ray Imaging Systemsfor International Safeguards Applications.” Proceedings of the 50 th Annual Meeting ofthe Institute of Nuclear Materials Management (INMM), Tucson, AZ, July 2009. [Role:Participant]


J.P. Hayward and D.K. Wehe, “Inter-strip interpolation simulations in a high-puritygermanium double-sided strip detector,” IEEE Nuclear Science Symposium, Dresden,Germany, October 2008. [Role: Work conducted as NASA Graduate Student ResearchProgram Fellow]J.P. Hayward and D.K. Wehe, “Inter-strip interpolation measurements in a high-puritygermanium double-sided strip detector,” Symposium for Radiation Measurements andApplications (SORMA) West, Berkeley, CA, June 2008. [Role: Work conducted asNASA Graduate Student Research Program Fellow]J.P. Hayward and D.K. Wehe, “Charge loss correction in a high-purity germaniumdouble-sided strip detector,” IEEE Nuclear Science Symposium, Honolulu, HI, October2007. [Role: Work conducted as NASA Graduate Student Research Program Fellow]J.P. Hayward and D.K. Wehe, “Observation of charge-sharing in a high-puritygermanium double-sided strip detector,” Symposium for Radiation Measurements andApplications (SORMA), Ann Arbor, MI, May 2006. [Role: Work conducted as NASAGraduate Student Research Program Fellow]Invited presentationsJ.P. Hayward and H.L. Hall, “The Nuclear Security Program at the University ofTennessee,” International Atomic Energy Agency, Vienna, Austria, Jul. 2012.J.P. Hayward and H.L. Hall, “The Nuclear Security Program at the University ofTennessee,” PHYSOR 2012 – Advances in Reactor Physics, Knoxville, TN, Apr. 2012.J.P. Hayward, “Dual Gamma Ray and Neutron Imaging for Mobile, Standoff Detectionof Nuclear Threat Sources,” The University of Illinois, Champaign, Illinois, Mar. 2012.J.P. Hayward, “Radiation sensors for nuclear security and non-proliferation,” UTK &Y12 Research Partner in Technology Forum, Oak Ridge, TN, Apr. 2011.Invited panel speaker, “Nuclear Security Education: The Education of Policy, Science,and Technology,” the Baker Center for Public Policy, Knoxville, TN, July 2010.J.P. Hayward, “Research in basic and applied nuclear detection for nuclear security andsafeguards applications,” North Carolina State University, Raleigh, NC, March 2010.J.P. Hayward, “Safeguards education and research activities at the University ofTennessee: A technical perspective,” Institute for Nuclear Materials ManagementSafeguards Workshop, The University of Missouri, Columbia, MO, February 2010.


J.P. Hayward, “A Science and Engineering Perspective on Safeguards Education,” LosAlamos National Lab/TAMU Next Generation Safeguards Initiative Human CapitalDevelopment Workshop, Santa Fe, New Mexico, August 2009.J.P. Hayward, “Research in basic and applied nuclear detection for nuclear security andsafeguards applications,” Georgia Institute of Technology, Atlanta, GA, August 2009.J.P. Hayward, “Safeguards and Security at the University of Tennessee,” ComingNuclear Renaissance for the Next Generation of Safeguards Specialists, Oak RidgeNational Laboratory, Oak Ridge, TN, December 2008.Five additional invited presentations (Institute for Nuclear Materials Management 2010,SPIE 2010, Whistler 2010, Prairie View A&M University, Lanzhou University) havebeen declined or postponed, to date.Selected research reports and presentations (non-refereed)J.P. Hayward, J.E. Sparger, and L. Fabris, “Critical Evaluation of Dual Gamma Ray andNeutron Imaging and Spectroscopy for Mobile, Standoff Detection of Shielded SpecialNuclear Material,” submitted to Department of Homeland Security, Sep. 2012. [Role:Sole PI]J.W. Cates and J.P. Hayward, “Initial Testing of Philips Digital Silicon PhotomultiplierArray Performance and Configuration Parameters,” submitted to Siemens MedicalImaging, Aug. 2012. [Role: Sole PI, Major Professor to first author.]C. Melcher, H. Rothfuss, S. Donnald, M. Tyagi, M. Koschan, J.P. Hayward, “FactorsPotentially Affecting Energy Migration and Proportionality in Scintillators,” 2012Symposium on Radiation Measurements and Applications (SORMA), Berkeley, CA,May 2012. [Role: co-PI]J.P. Hayward and L. Fabris, “Preliminary Evaluation of Dual Gamma Ray and NeutronImaging and Spectroscopy for Mobile, Standoff Detection of Shielded Special NuclearMaterial,” submitted to Department of Homeland Security, Jan 2012. [Role: Sole PI]C. Melcher, J.P. Hayward, M. Koschan, M. Tyagi, H. Rothfuss, S. Donnald, B. Blalock,“Enhancing Energy Migration and Proportionality in Scintillators,” University andIndustry Technical Interchange Review Meeting, Oakland, CA, Dec. 2011. [Role: Co-PI,major professor to graduate student on project]Y. Diawara, L. Crow, J.P. Hayward, V. Sedov, M. Kocsis, X. Zhang, “Novel ResistivePlate Avalanche Chamber for Neutron Detection,” LDRD project report submitted toONRL, Aug. 2011. [Role: Participant]


J.P. Hayward and L. Fabris, “Feasibility Evaluation of Dual Gamma Ray and NeutronImaging and Spectroscopy for Mobile, Standoff Detection of Shielded Special NuclearMaterial,” submitted to Department of Homeland Security, May 2011. [Role: Sole PI]C.L. Melcher, J.P. Hayward, M. Zhuravleva, M. Koschan, H. Rothfuss, K. Yang,“Enhancing Energy Migration and Proportionality in Scintillators,” DOE NNSAUniversity and Technical Interchange (UITI) 2010, Knoxville, TN, December 2010.[Role: co-PI]J.P. Hayward, “Exploiting Time-Correlated Signatures and Directionality ofInterrogation to Detect Shielded Highly-Enriched Uranium,” oral and written reportssubmitted annually since 2010. Oral reports presented at Academic Research InitiativeGrantees Conference in Washington, D.C. Four student posters presented (2010 and2011). [Role: Sole PI]J.P. Hayward, “Glasses for detection of penetrating radiation via the Cherenkov Effect,”Oral and written reports submitted annually from 2009-present. Oral reports occur inWashington, D.C. at DTRA Basic Research Technical Review. Four student/postdocposter presentations (2010 and 2011). [Role: Sole PI]J.P. Hayward, K.P. Ziock, T. Karnowski, M. Cunningham, “Motion correction for shipto-ship,passive inspections: Motion measurement campaign,” Presented at DOE NA-22program review meeting, Oak Ridge, TN, July 2009. Report submitted in 2010. [Role:Participant]K.P. Ziock, J.P. Hayward, T. Karnowski, L. Fabris, “Motion correction for ship-to-shippassive inspections,” RadSensing 2009, Richland, Washington, June 2009. [Role:Participant]B.C. Senter and J.P. Hayward, “Charge collection efficiency mapping in a quasihemisphericalCdZnTe detector,” report submitted to ICx Radiation, January 2009. [Role:Major Professor to first author]J.P. Hayward, L. Leal, A. Thornton, B. Goddard, “NDA measurement considerationsand nuclear data needs for safeguarding of complex material forms,” report submitted toDOE NNSA sponsor, July 2008. [Role: Participant]J.P. Hayward and G. Roach, “The state-of-the-art of nuclear batteries and potential forfuture Naval application,” report submitted to the Office of Naval Research, November2004. [Role: Naval Officer, project lead]R. Daum, J.P. Hayward, R. Firnstein, “Commerical-Off-The-Shelf RadiologicalDetection Equipment for the Warfighter,” report submitted to the Office of NavalResearch, January 2004. [Role: Naval Officer]


Invention disclosuresJ.P. Hayward, K.P. Ziock, P.A. Hausladen, L. Fabris, “Hybrid detector planes forcombined imaging of gamma rays and neutrons,” submitted to UT-Battelle, October2010.J.P. Hayward, “Methodology for selective, ultrafast, efficient, directional sensing of MeVphotons in non-scintillating glasses via the Cherenkov effect,” submitted to UT-Knoxville, April 2011.J.P. Hayward, “Novel directional gamma-ray detection method,” submitted to UT-Knoxville, July 2011.J.P. Hayward, “Large-area, non-scintillating glass gamma-ray spectrometers,” submittedto UT-Knoxville, July 2011.J.P. Hayward, “Large-area, high-count-rate neutron detectors,” submitted to UT-Knoxville, August 2011.

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