J
James R. Arnold
Researcher at University of California, San Diego
Publications - 85
Citations - 5224
James R. Arnold is an academic researcher from University of California, San Diego. The author has contributed to research in topics: Cosmic ray & Cosmogenic nuclide. The author has an hindex of 33, co-authored 85 publications receiving 4995 citations.
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Journal ArticleDOI
Distribution of Hydrogen in the Near-Surface of Mars: Evidence for Subsurface Ice Deposits
William V. Boynton,W. C. Feldman,S. W. Squyres,Thomas H. Prettyman,J. Brückner,Larry G. Evans,R. C. Reedy,R. C. Reedy,R. D. Starr,James R. Arnold,D. M. Drake,P. Englert,Albert E. Metzger,I. G. Mitrofanov,Jacob I. Trombka,Claude d’Uston,Heinrich Wänke,Olivier Gasnault,D. K. Hamara,Daniel M. Janes,Robert L. Marcialis,Sylvestre Maurice,I. Mikheeva,G. J. Taylor,R. L. Tokar,C. Shinohara +25 more
TL;DR: The Gamma-Ray Spectrometer on the Mars Odyssey has identified two regions near the poles that are enriched in hydrogen, and it is suggested that the host of the hydrogen in the subsurface layer is ice, which constitutes 35 ± 15% of the layer by weight.
Journal ArticleDOI
Cosmic ray production rates of 10Be and 26Al in quartz from glacially polished rocks
TL;DR: In this paper, the concentrations of Be-10 and Al-26 in quartz crystals extracted from glacially polished granitic surfaces from the Sierra Nevada range were studied and the most accurate estimates of absolute production rates of three nuclides in SiO2 due to cosmic ray nucleons and muons for geomagnetic latitudes 43.8-44.6 N and altitudes 2.1-3.6 km.
Journal ArticleDOI
The Mars Odyssey Gamma-Ray Spectrometer Instrument Suite
William V. Boynton,W. C. Feldman,I. G. Mitrofanov,Larry G. Evans,Robert C. Reedy,Steven W. Squyres,R. D. Starr,Jacob I. Trombka,Claude d’Uston,James R. Arnold,P. A. J. Englert,Albert E. Metzger,Heinrich Wänke,J. Brückner,D. M. Drake,C. Shinohara,C. Fellows,D. K. Hamara,K. Harshman,K. Kerry,C. Turner,Martin Ward,H. Barthe,K. R. Fuller,S. A. Storms,G. W. Thornton,J. L. Longmire,M. L. Litvak,A. K. Ton'chev +28 more
TL;DR: The Mars Odyssey Gamma-Ray Spectrometer (MOGRS) is a suite of three different instruments, a gamma subsystem (GS), a neutron spectrometer, and a high-energy neutron detector, working together to collect data that will permit the mapping of elemental concentrations on the surface of Mars.
Journal ArticleDOI
Concentration of H, Si, Cl, K, Fe, and Th in the low- and mid-latitude regions of Mars
William V. Boynton,G. J. Taylor,Larry G. Evans,Robert C. Reedy,R. D. Starr,Daniel M. Janes,K. Kerry,D. M. Drake,Kyeong Ja Kim,Kyeong Ja Kim,R. M. S. Williams,M. K. Crombie,James M. Dohm,Victor R. Baker,Albert E. Metzger,Suniti Karunatillake,John Keller,John Keller,Horton E. Newsom,James R. Arnold,J. Brückner,P. A. J. Englert,Olivier Gasnault,Ann L. Sprague,I. G. Mitrofanov,S. W. Squyres,Jacob I. Trombka,L. C. d'Uston,Heinrich Wänke,D. K. Hamara +29 more
TL;DR: The Gamma Ray Spectrometer (GRS) on board the 2001 Mars Odyssey Mission for ±∼45° latitudes was used to determine the concentrations of H, Si, Cl, K, Fe, and Th.
Journal ArticleDOI
Cosmic ray produced 10Be and 26Al in Antarctic rocks: exposure and erosion history
TL;DR: In this paper, mean erosion rates were calculated for the limiting case of steady-state surface exposure to cosmic rays, and minimum exposure ages, for the limited case of no erosion, and the sampling is believed to be sufficient to generalize this result to exposed bedrock in Antarctica.