Larry Evans Astrochemistry Laboratory, Code 691 NASA Goddard Space Flight Center Greenbelt, MD 20771 Phone: (301) 286-5759 Email: Larry Evans

Current Position

Principal Scientist, Astrochemistry Laboratory

Professional Experience

• Near Earth Asteroid Rendezvous (NEAR) X-ray/Gamma-ray Spectrometer Science Team Associate Member
• Co-Investigator, XGRS for Planetary Missions PIDDP Investigation
• Participating Scientist, Mars Observer Mission Gamma-Ray Spectrometer Team
• Co-Investigator, U.S.-Russian Long-Duration Mars-Calibration Balloon Flight (LAMB mission)
• National Research Council Postdoctoral Research Associate, NASA/GSFC
• Systems Sciences Division, Science Programs , Computer Sciences Corporation
• Discipline Scientist, Planetary Instrument Definition and Development Program, Solar System Exploration Division, NASA Headquarters
• Adjunct Professor, Geology Department, University of Maryland

Selected Publications

• More than 40 scientific publications, primarily in the areas of gamma-ray, x-ray and neutron spectroscopy, data analysis, and the theoretical determination of gamma-ray and x-ray emission fluxes for geochemical analysis of planetary bodies in the solar system.
• 1997  "Continuum Background in Space-Borne Gamma-ray Detectors", L. G. Evans, J. I. Trombka, R. Starr,W. V. Boynton, and S. H. Bailey, Conference on High Energy Radiation Background in Space, July 22-23.
• 1997  "Induced Background in the Mars-Observer Gamma-ray Spectrometer", W. V. Boynton, L. G. Evans, R. Starr, J. BrÁckner, S. H. Bailey, and J. I. Trombka, Conference on High Energy Radiation Background in Space, July 22-23.
• 1997  "Comparison Between Prediction and Observations of Induced Radioactive Background in Interplanetary Missions", C. Dyer, P. Truscott, L. Evans, and J. Trombka, Conference on High Energy Radiation Background in Space, July 22-23.
• 1997  "Compositional Mapping with the NEAR X-ray/Gamma-ray Spectrometer", J. I. Trombka, S. R. Floyd, W. V. Boynton, S. Bailey, J. BrÁckner, S. W. Squyres, L. G. Evans, P. E. Clark, R. Starr, E. Fiore, R. Gold, J. Goldsten, and R. McNutt, J. Geophys. Res., 102, 23729-23750.
• 1996  "Performance of the Gamma-Ray Detector System for the NEAR Mission and Application to Future Missions" L. G. Evans, R. Starr, J. I. Trombka, J. BrÁckner, W. V. Boynton, S. H. Bailey, J. Goldsten, and R. McNutt, Presented at the Second IAA International Conference on Low-Cost Planetary Missions, L-0905P, April 16-19.
• 1995  "Analysis of Radiation Damaged HPGe Detectors with a New Algorithm, M. Koenen, J. BrcÁkner, U. Fabian, H. Kruse, H. Wanke, A. N. F. Schroeder, R. Starr, L. G. Evans, J. I. Trombka, D. M. Drake, P. A. J. Englert, and J. Dempsey, IEEE Trans. Nuclear Science.
• 1995  "Small X-ray/Gamma-Ray Geochemical Experiment Package for Discovery Class Missions" L. G. Evans, P. E. Clark, and J. I. Trombka, Proceedings of the IAA International Conference on Low-Cost Planetary Missions, Acta Astronautica, 35, 79-88.
• 1993  "Introduction to Planetary Remote-Sensing Gamma-ray Spectroscopy", L. G. Evans, R. C. Reedy, and J. I. Trombka, in Remote Geochemical Analysis: Geochemical and Mineralogical Composition, ed. C. Pieters and P. Englert, Cambridge University Press, New York, pp. 167-198.
• 1993  "The Composition of Mars and Comets by Remote and In-Situ Gamma-Ray Spectrometry", W. V. Boynton, L. G. Evans, R. C. Reedy, and J. I. Trombka, in Remote Geochemical Analysis: Geochemical and Mineralogical Composition, ed. C. Pieters and P. Englert, Cambridge University Press, New York, pp.395-412.
• 1992  "Effects of Material Mixing on Planetary Gamma-Ray Spectroscopy", S. W. Squyres and L. G. Evans, J. Geophys. Res., 97(E9), 14701.
• 1992  "Science Applications of the Mars Observer Gamma Ray Spectrometer", W. V. Boynton, J. I. Trombka, W. C. Feldman, J. R. Arnold, P. Englert, A. E. Metzger, R. C. Reedy, S. W. Squyres, H. Waenke, S. H. Bailey, J. BrÁckner, J. L. Callas, D. M. Drake, P. Duke, L. G. Evans, E. L. Haines, F. C. McCloskey, H. Mills, C. Shinohara, and R. Starr, J. Geophys. Res. E5, 7681.
• 1988  "XRF and Gamma-ray Spectrometer for Mars Sample Selection and Analysis", L. I. Yin, J. I. Trombka, L. G. Evans, R. D. Starr, and S. W. Squyres, Pathfinder: Sample Acquisition, Analysis, and Preservation Instrument Technology Workshop, Johnson Space Center, November 14-16, 48.
• 1987  "Investigation of Martian HO2 and CO2 via Orbital Gamma Ray Spectroscopy", L. G. Evans and S. W. Squyres, J. Geophys. Res., 92, 9153.