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  • 1
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    Absorption coefficient and photoionization yield of no in the region 580-1350 angstrom units. (1967)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Photoionization yield and absorption coefficient of nitric oxide at various wavelengths in 580-1350 angstrom region, using H sub 2 emission sources
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: APPLIED OPTICS
    Format: text
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  • 2
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    PLANETARY AERONOMY I- ABSORPTION AND PHOTOIONIZATION COEFFICIENTS OF PROPYLENE AND BUTENE-1 IN THE VACUUM ULTRAVIOLET (1962)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Planetary aeronomy - absorption and photoionization coefficients of propylene and butene-1 in vacuum ultraviolet
    Keywords: NAVIGATION
    Type: GCA-TR-62-4-N
    Format: text
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  • 3
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    Studying the High Energy Gamma Ray Sky with Gamma Ray Large Area Space Telescope (GLAST) (1998)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Building on the success of the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory, the Gamma Ray Large Area Space Telescope (GLAST) will make a major step in the study of such subjects as blazars, gamma Ray bursts, the search for dark matter, supernova remnants, pulsars, diffuse radiation, and unidentified high energy sources. The instrument will be built on new and mature detector technologies such as silicon strip detectors, low-power low-noise LSI, and a multilevel data acquisition system. GLAST is in the research and development phase, and one full tower (of 25 total) is now being built in collaborating institutes. The prototype tower will be tested thoroughly at Stanford Linear Accelerator Center (SLAC) in the fall of 1999.
    Keywords: Astronomy
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  • 4
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    INTEGRAL/SPI Limits on Electron-Positron Annihilation Radiation from the Galactic Plane (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The center of our Galaxy is a known strong source of electron-positron 511- keV annihilation radiation. Thus far, however, there have been no reliable detections of annihilation radiation outside of the central radian of our Galaxy. One of the primary objectives of the INTEGRAL (INTErnational Gamma-RAy Astrophysics Laboratory) mission, launched in Oct. 2002, is the detailed study of this radiation. The Spectrometer on INTEGRAL (SPI) is a high resolution coded-aperture gamma-ray telescope with an unprecedented combination of sensitivity, angular resolution and energy resolution. We report results from the first 10 months of observation. During this period a significant fraction of the observing time was spent in or near the Galactic Plane. No positive annihilation flux was detected outside of the central region (|l| greater than 40 degrees) of our Galaxy. In this paper we describe the observations and data analysis methods and give limits on the 511-keV flux.
    Keywords: Astronomy
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  • 5
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    A Comprehensive Search for Gamma-Ray Lines in the First Year of Data from the INTEGRAL Spectrometer (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: Gamma-ray lines are produced in nature by a variety of different physical processes. They can be valuable astrophysical diagnostics providing information the may be unobtainable by other means. We have carried out an extensive search for gamma-ray lines in the first year of public data from the Spectrometer (SPI) on the INTEGRAL mission. INTEGRAL has spent a large fraction of its observing time in the Galactic Plane with particular concentration in the Galactic Center (GC) region (approximately 3 Msec in the first year). Hence the most sensitive search regions are in the Galactic Plane and Center. The phase space of the search spans the energy range 20-8000 keV, and line widths from 0-1000 keV (FWHM) and includes both diffuse and point-like emission. We have searched for variable emission on time scales down to approximately 1000 sec. Diffuse emission has been searched for on a range of different spatial scales from approximately 20 degrees (the approximate field-of-view of the spectrometer) up to the entire Galactic Plane. Our search procedures were verified by the recovery of the known gamma-ray lines at 511 keV and 1809 keV at the appropriate intensities and significances. We find no evidence for any previously unknown gamma-ray lines. The upper limits range from a few x10(exp -5) per square centimeter per second to a few x10(exp -3) per square centimeter per second depending on line width, energy and exposure. Comparison is made between our results and various prior predictions of astrophysical lines
    Keywords: Astrophysics
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  • 6
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    Some Intensity Measurements in the Vacuum Ultraviolet (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Intensity measurements in vacuum ultraviolet - photoelectric yields of untreated metals and semiconductors measured by calibrated thermocouple
    Keywords: PHYSICS, SOLID-STATE
    Type: NASA-CR-58429
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  • 7
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    On vacuum UV study of solids Status report no. 7, Nov. 1 - Apr. 30, 1966 (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Electron emission, conductivity, and luminescence of selected solids under ultraviolet radiation
    Keywords: PHYSICS, SOLID-STATE
    Type: NASA-CR-75109
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  • 8
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    Photoionization yield and absorption coeffi- cient of xenon in the region 860-1022 deg angstrom (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Photoionization yield and absorption coefficient of xenon gas measured by photoelectric methods
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-58456
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  • 9
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    Delayed particles in EAS at Akeno (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Using two 2.25 square meter fast scintillation detectors, delayed particles in cosmic ray showers (CRS) have been observed at Akeno Observatory. These are set under 1 m concrete and 2.5 cm lead plates respectively. About 2500 CRS are analyzed. The lateral distribution of delayed particles for the CRS size 10 to the 7th power is flatter than that for to the 7th power. The lateral density of delayed particles is almost constant for the size range 2.2 X 10 to the 5th power approx. 10 to the 7th power and increases rapidly above 10 to the 7th power. These facts may suggest change of nuclear interaction at 10 to the 7th power and substantially the existence of heavy particles with long life.
    Keywords: SPACE RADIATION
    Type: HE-6.2-8 , 19th Intern. Cosmic Ray Conf - Vol. 8; p 279-282; NASA-CP-2376-VOL-8
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  • 10
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    Polluted and turbid water masses in Osaka Bay and its vicinity revealed with ERTS-A imageries (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: ERTS-1 took very valuable MSS imageries of Osaka Bay and its vicinity on October 24, 1972. In the MSS-4 and MSS-5 imageries a complex grey pattern of water masses can be seen. Though some of grey colored patterns seen in black and white prints of the MSS-4 and MSS-5 imageries are easily identified from their shapes as cloud covers or polluted water masses characterized by their color tone in longer wavelengths in the visible region, any correct distribution pattern of polluted or turbid water masses can be hardly detected separately from thin cloud covers in a quick look analysis. In the present investigation, a simple photographic technique was applied using the fact that reflected sun light from cloud including smog and inclined water surfaces of wave have a certain component in the near infrared region, that MSS-7, whereas the light scattered from fine materials suspended in the sea water has nearly no component sensible in MSS-4 and MSS-5 channels.
    Keywords: GEOPHYSICS
    Type: PAPER-E14C , NASA. Goddard Space Flight Center Symp. on Significant Results obtained from the ERTS-1, Vol. 1, Sect. A and B; p 681-687
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