Issue 10 Volume 41 May 16, 2003

Ray Experiment Telescope (EGRET) intensities. On this basis we re-evaluate the isotropic extragalactic gamma-ray
background. We find that for some energies previous work underestimated the Galactic contribution and hence overestimated
the background. Our new background spectrum shows a positive curvature similar to that expected for models of the
extragalactic emission based on the blazar population.
Author
Gamma Ray Observatory; Background Radiation; Astronomical Models; Computer Programs; Gamma Ray Astronomy
20030032988 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Evaluation of Production Cross Sections of Li, Be, B in CR
Moskalenko, I. V.; Mashnik, S. G.; March 27, 2003; 1 pp.; In English; 28th ICRC Meeting, 31 Jul. - 7 Aug. 2003, Japan; No
Copyright; Avail: Other Sources; Abstract Only
Accurate evaluation of the production cross section of light elements is important for models of cosmic ray (CR)
propagation, galactic chemical evolution, and cosmological studies. However, the experimental spallation cross section data
are scarce and often unavailable to CR community while semi-empirical systematics are frequently wrong by a significant
factor. Running sophisticated nuclear codes is not an option of choice for everyone either. We use the Los Alamos versions
of the Quark-Gluon String Model code LAQGSM and the improved Cascade-Exciton Model code CEM2k together with all
available data from Los Alamos Nuclear Laboratory (LANL) nuclear database to produce evaluated production cross sections
of isotopes of Li, Be, and B suitable for astrophysical applications. The LAQGSM and CEM2k models have been shown to
reproduce well nuclear reactions and hadronic data in the range 0.01-800 GeV/nucleon.
Author
Cosmic Rays; Cross Sections; Lithium; Beryllium; Boron; Computerized Simulation
20030033923 Georgia Univ., Athens, GA, USA
Ultraviolet and Visible Emission Mechanisms in Astrophysics
Stancil, Phillip C.; Schultz, David R.; April 29, 2003; 6 pp.; In English
Contract(s)/Grant(s): NAG5-9088; No Copyright; Avail: CASI; A02, Hardcopy
The project involved the study of ultraviolet (UV) and visible emission mechanisms in astrophysical and atmospheric
environments. In many situations, the emission is a direct consequence of a charge transferring collision of an ion with a
neutral with capture of an electron to an excited state of the product ion. The process is also important in establishing the
ionization and thermal balance of an astrophysical plasma. As little of the necessary collision data are available, the main thrust
of the project was the calculation of total and state-selective charge transfer cross sections and rate coefficients for a very large
number of collision systems. The data was computed using modern explicit techniques including the molecular-orbital
close-coupling (MOCC), classical trajectory Monte Carlo (CTMC), and continuum distorted wave (CDW) methods. Estimates
were also made in some instances using the multichannel Landau-Zener (MCLZ) and classical over-the-barrier (COB) models.
Much of the data which has been computed has been formatted for inclusion in a charge transfer database on the World Wide
Web (cfadc.phy.ornl.gov/astro/ps/data/). A considerable amount of data has been generated during the lifetime of the grant.
Some of it has not been analyzed, but it will be as soon as possible, the data placed on our website, and papers ultimately
written.
Derived from text
Ultraviolet Emission; Ultraviolet Astronomy; Space Plasmas; Ionic Collisions; Charge Transfer; Cross Sections
99
GENERAL
Includes aeronautical, astronautical, and space science related histories, biographies, and pertinent reports too broad for categorization;
histories or broad overviews of NASA programs such as Apollo, Gemini, and Mercury spacecraft, Earth Resources Technology Satellite
(ERTS), and Skylab; NASA appropriations hearings.
20030032368 NASA Ames Research Center, Moffett Field, CA, USA
Memoirs of an Aeronautical Engineer: Flight Tests at Ames Research Center: 1940-1970
Anderson, Seth B.; [2002]; 173 pp.; In English; Original contains black and white illustrations
Report No.(s): NASA/SP-2002-4526; NAS 1.21:4526; No Copyright; Avail: CASI; A08, Hardcopy
Seth worked over a period of several years to prepare this monograph-collecting information, drafting the text, and finding
and selecting the historic photographs. He describes the beginnings of flight research as he knew it at Ames Research Center,
242