Search Results - "Evans, L.G"

CdWO4 scintillator as a compact gamma ray spectrometer for planetary lander missions by Eisen, Y, Evans, L.G, Starr, R, Trombka, J.I

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Hydrogen distribution in the lunar polar regions by Sanin, A.B., Mitrofanov, I.G., Litvak, M.L., Bakhtin, B.N., Bodnarik, J.G., Boynton, W.V., G. Chin, Evans, L.G., Harshman, K., Fedosov, F., Golovin, D.V., Kozyrev, A.S., Livengood, T.A., Malakhov, A.V., McClanahan, T.P., Mokrousov, M.I., Starr, R.D., Sagdeev, R.Z., Tret'yakov, V.I., Vostrukhin, A.A.

“…•LEND/LRO instrument neutron counting data sets have been analyzed to create high resolution maps of epithermal neutron flux at polar regions of the Moon.•The…”
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Hydrogen Mapping of the Lunar South Pole Using the LRO Neutron Detector Experiment LEND by Mitrofanov, I.G, Sanin, A.B, Boynton, W.V, Chin, G, Garvin, J.B, Golovin, D, Evans, L.G, Harshman, K, Kozyrev, A.S, Litvak, M.L, Malakhov, A, Mazarico, E, McClanahan, T, Milikh, G, Mokrousov, M, Nandikotkur, G, Neumann, G.A, Nuzhdin, I, Sagdeev, R, Shevchenko, V, Shvetsov, V, Smith, D.E, Starr, R, Tretyakov, V.I, Trombka, J, Usikov, D, Varenikov, A, Vostrukhin, A, Zuber, M.T

“…Hydrogen has been inferred to occur in enhanced concentrations within permanently shadowed regions and, hence, the coldest areas of the lunar poles. The Lunar…”
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Absolute Branching Ratios of Prominent γ Rays Following α Decay of 233U by Gray, T.J., Allmond, J.M., Evans, L.G., Roach, B.D., King, T.T., Rasco, B.C.

“…The absolute γ-ray branching ratios (emission probabilities) for 19 prominent peaks in the α decay of 233U are reported with energies ranging from 97 to 366…”
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Background and Lunar Neutron Populations Detected by LEND and Average Concentration of Near-Surface Hydrogen near the Moon's Poles by Livengood, Timothy A., Mitrofanov, I.G., Chin, Gordon, Boynton, William V., Bodnarik, J.G., Evans, L.G., Harshman, K.P., Litvak, M.L., Mcclanahan, Timothy P., Sagdeev, R.Z., Sanin, A.B., Starr, Richard D., Su, Jao-Jang

“…Neutron flux measurements by the Lunar Exploration Neutron Detector (LEND) on the Lunar Reconnaissance Orbiter (LRO) enable quantifying hydrogen-bearing…”
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Distribution of Hydrogen in the near Surface of Mars: Evidence for Subsurface Ice Deposits by Boynton, W. V., Feldman, W. C., Squyres, S. W., Prettyman, T. H., Brückner, J., Evans, L. G., Reedy, R. C., Starr, R., Arnold, J. R., Drake, D. M., Englert, P. A. J., Metzger, A. E., Mitrofanov, Igor, Trombka, J. I., d'Uston, C., Wänke, H., Gasnault, O., Hamara, D. K., Janes, D. M., Marcialis, R. L., Maurice, S., Mikheeva, I., Taylor, G. J., Tokar, R., Shinohara, C.

“…Using the Gamma-Ray Spectrometer on the Mars Odyssey, we have identified two regions near the poles that are enriched in hydrogen. The data indicate the…”
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Background and lunar neutron populations detected by LEND and average concentration of near-surface hydrogen near the Moon's poles by Livengood, T.A., Mitrofanov, I.G., Chin, G., Boynton, W.V., Bodnarik, J.G., Evans, L.G., Harshman, K.P., Litvak, M.L., McClanahan, T.P., Sagdeev, R.Z., Sanin, A.B., Starr, R.D., Su, J.J.

“…Neutron flux measurements by the Lunar Exploration Neutron Detector (LEND) on the Lunar Reconnaissance Orbiter (LRO) enable quantifying hydrogen-bearing…”
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Moonshine: Diurnally varying hydration through natural distillation on the Moon, detected by the Lunar Exploration Neutron Detector (LEND) by Livengood, T.A., Chin, G., Sagdeev, R.Z., Mitrofanov, I.G., Boynton, W.V., Evans, L.G., Litvak, M.L., McClanahan, T.P., Sanin, A.B., Starr, R.D., Su, J.J.

“…•LEND on LRO detects diurnally varying suppression of epithermal neutron flux near the Moon’s equator.•Neutron suppression is consistent with presence of…”
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Evidence for the sequestration of hydrogen-bearing volatiles towards the Moon’s southern pole-facing slopes by McClanahan, T.P., Mitrofanov, I.G., Boynton, W.V., Chin, G., Bodnarik, J., Droege, G., Evans, L.G., Golovin, D., Hamara, D., Harshman, K., Litvak, M., Livengood, T.A., Malakhov, A., Mazarico, E., Milikh, G., Nandikotkur, G., Parsons, A., Sagdeev, R., Sanin, A., Starr, R.D., Su, J.J., Murray, J.

“…•Concentrations of hydrogen-bearing volatiles are biased towards the Moon's southern pole-facing slopes.•Pole-facing slopes are being hydrated in a continuum…”
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Time-resolved neutron/gamma-ray data acquisition for in situ subsurface planetary geochemistry by Bodnarik, J.G., Burger, D.M., Burger, A., Evans, L.G., Parsons, A.M., Schweitzer, J.S., Starr, R.D., Stassun, K.G.

“…The current gamma-ray/neutron instrumentation development effort at NASA Goddard Space Flight Center aims to extend the use of active pulsed neutron…”
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The variations of neutron component of lunar radiation background from LEND/LRO observations by Litvak, M.L., Mitrofanov, I.G, Sanin, A.B., Bakhtin, B.N., Bodnarik, J.G., Boynton, W.V., Chin, G., Evans, L.G., Harshman, K., Livengood, T.A., Malakhov, A., Mokrousov, M.I., McClanahan, Т.P., Sagdeev, R., Starr, R.

“…Lunar neutron flux data measured by the Lunar Exploration Neutron Detector (LEND) onboard NASA׳s Lunar Reconnaissance Orbiter (LRO) were analyzed for the…”
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The Mars Odyssey Gamma-Ray Spectrometer Instrument Suite by Boynton, W V, Feldman, W C, Mitrofanov, I G, Evans, L G, Reedy, R C, Squyres, S W, Starr, R, Trombka, JI, d'Uston, C, Arnold, J R, Englert, PAJ, Metzger, A E, Waenke, H, Brueckner, J, Drake, D M, Shinohara, C, Fellows, C, Hamara, D K, Harshman, K, Kerry, K, Turner, C, Ward, M, Barthe, H, Fuller, K R, Storms, SA, Thornton, G W, Longmire, J L, Litvak, M L, Ton'chev, A K

“…The Mars Odyssey Gamma-Ray Spectrometer is a suite of three different instruments, a gamma subsystem (GS), a neutron spectrometer, and a high-energy neutron…”
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Experimental evaluation of a boron-lined parallel plate proportional counter for use in nuclear safeguards coincidence counting by Henzlova, D., Evans, L.G., Menlove, H.O., Swinhoe, M.T., Marlow, J.B.

“…Boron-lined proportional technologies are increasingly being considered as a viable option for the near-term replacement of 3He-based technologies for use in…”
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A new alternative singles rate dead time correction algorithm for use in neutron multiplicity analysis by Croft, S., Evans, L.G., Favalli, A., Hauck, D., Henzlova, D., Santi, P., Swinhoe, M.T.

“…In this article we extend the neutron multiplicity counting dead time correction scheme devised by Dytlewski to include Singles. In this way a self consistent,…”
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Revisiting the form of dead time corrections for neutron coincidence counting by Croft, S., Evans, L.G., Favalli, A., Hauck, D.K., Henzlova, D., Santi, P.

“…A standard nondestructive assay technique for determining the mass of plutonium in an item is passive neutron coincidence counting. In passive neutron…”
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Radiation damage of Schottky CdTe detectors irradiated by 200 MeV protons by Eisen, Y, Evans, L.G, Floyd, S, Schlemm, C, Starr, R, Trombka, J

“…This study describes the damage of a 2mm×2mm×1mm Schottky CdTe detector after being irradiated by 200MeV protons to a total fluence in the range…”
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Comparison of wheat simulation models under climate change. I. Model calibration and sensitivity analyses by Wolf, J., Evans, L. G., Semenov, M. A., Eckersten, H., Iglesias, A.

“…A comparison of the performance of 5 wheat models was carried out for 2 sites in Europe with considerably different agroclimatic conditions: Rothamsted, UK,…”
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CdWO 4 scintillator as a compact gamma ray spectrometer for planetary lander missions by Eisen, Y, Evans, L.G, Starr, R, Trombka, J.I

“…The objective of this work is to develop a gamma ray spectrometer (GRS) suitable for use on planetary rover missions. The main characteristics of this detector…”
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Comparison of wheat simulation models under climate change. II. Application of climate change scenarios by Semenov, M. A., Wolf, J., Evans, L. G., Eckersten, H., Iglesias, A.

“…A comparison of the performance of 5 wheat models (AFRCWHEAT2, CERES, NWHEAT, SIRIUS and SOILN) was carried out for 2 sites in Europe: Rothamsted, UK, and…”
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Instrument Calibrations and Data Analysis Procedures for the NEAR X-Ray Spectrometer by Starr, R., Clark, P.E., Murphy, M.E., Floyd, S.R., McClanahan, T.P., Nittler, L.R., Trombka, J.I., Evans, L.G., Boynton, W.V., Bailey, S.H., Bhangoo, J., Mikheeva, I., Brückner, J., Squyres, S.W., McCartney, E.M., Goldsten, J.O., McNutt, R.L.

“…The X-Ray spectrometer onboard the Near Earth Asteroid Rendezvous spacecraft will measure X-rays from the surface of 433 Eros in the energy region 0.7–10 keV…”
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