Zobrazeno 1 - 10
of 32
pro vyhledávání: '"R. C. Reedy"'
Autor:
L, Fimiani, D L, Cook, T, Faestermann, J M, Gómez-Guzmán, K, Hain, G, Herzog, K, Knie, G, Korschinek, P, Ludwig, J, Park, R C, Reedy, G, Rugel
Publikováno v:
Physical review letters. 116(15)
A dying massive star ends in a supernova explosion ejecting a large fraction of its mass into the interstellar medium. If this happens nearby, part of the ejecta might end on Solar System bodies and, in fact, radioactive ^{60}Fe has been detected on
Publikováno v:
Icarus. 174:205-214
The age of the surface of Europa is probably tens of Myr or less, but is poorly constrained. Two different geochronology schemes could potentially be applied to near-surface samples to provide far more precise ages. First, the surface salts apparentl
Autor:
P. Englert, R. D. Starr, Claude d’Uston, Albert E. Metzger, Robert L. Marcialis, Thomas H. Prettyman, C. Shinohara, R. C. Reedy, Heinrich Wänke, Sylvestre Maurice, Jacob I. Trombka, S. W. Squyres, James R. Arnold, Olivier Gasnault, William V. Boynton, D. K. Hamara, I. G. Mitrofanov, J. Brückner, G. J. Taylor, D. M. Drake, Daniel M. Janes, Larry G. Evans, W. C. Feldman, R. L. Tokar, I. Mikheeva
Publikováno v:
Science. 297:81-85
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 presence of a subsurface layer enriched in hydrogen overlain by a hydrogen-poor layer. The thickn
Publikováno v:
Scopus-Elsevier
Long-lived cosmogenic radioisotopes, 10Be, 26Al, 36Cl, 41Ca and 59Ni, have been measured in five samples from the Campo del Cielo iron meteorite by accelerator mass spectrometry (AMS). The 36Cl activities were significantly above the background. For
Autor:
Stephanie C. Frankle, R. C. Reedy
Publikováno v:
Atomic Data and Nuclear Data Tables. 80:1-34
The energies and intensities of prompt gamma rays produced by the radiative capture of thermal neutrons have been compiled and evaluated for elements with atomic numbers Z=1–30. These elements are important for many applications, including well log
Autor:
Jozef Masarik, J. O. Goldstein, R. C. Reedy, Jacob I. Trombka, R. D. Starr, Larry R. Nittler, J. Brückner, Timothy J. McCoy, L. G. Evans, William V. Boynton
Publikováno v:
Meteoritics & Planetary Science. 36:1639-1660
— Elemental composition and composition ratios derived from gamma-ray measurements collected by the NEAR-Shoemaker spacecraft while on the surface of 433 Eros are reported. Performance of the gamma-ray spectrometer (GRS) during cruise and orbit is
Publikováno v:
Meteoritics & Planetary Science. 36:643-650
The production of 3 He, 21 Ne, and 22 Ne in meteoroids of various sizes and in the lunar surface was investigated. The LAHET code system, a purely physical model for calculating cosmic- ray particle fluxes, was used to simulate cosmic-ray particle in
Autor:
R. C. Reedy
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 172:782-785
The determination and some uses of production rates of cosmogenic nuclides are reviewed. Emphasis is on work done since 1993 for long-lived cosmogenic radionuclides in extraterrestrial matter. Several Monte Carlo computer codes are being used to nume
Autor:
R. C. Reedy
Publikováno v:
Journal of Earth System Science. 107:433-440
Modern solar energetic particles (SEPs) have been studied for about 50 years by satellites and ground-based observations. These measurements indicate much about the nature of SEPs but cover too short a period to quantify the probabilities of very lar
Publikováno v:
Physical Review B. 83
We studied the effect of Bi incorporation on the hole mobility in the dilute bismide alloy GaAs${}_{1\ensuremath{-}x}$Bi${}_{x}$ using electrical transport (Hall) and photoluminescence (PL) techniques. Our measurements show that the hole mobility dec