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Author: J. D. Kurfess Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
The Oriented Scintillation Spectrometer Experiment (OSSE) for the Gamma Ray observatory is described. OSSE uses four identical NaI(Tl)-CsI(Na) phoswich detectors to provide gamma-ray line and continuum detection capability in the 0.05-10 MeV energy range. Additioal gamma-ray and neutron detection capability is achieved above 10 MeV. Each detector has a CsI annular shield and a tungsten alloy collimator which define a 5 x 11 deg (FWHM) field-of-view. The detectors have independent, single-axis orientation systems which permit offset pointing to provide source-background subtraction. The sensitivity for line gamma rays the 0.05-10 MeV region will be .00002 - 00003 photons/cc-s for a .000001-second observation period. The several modes of data acquisition and the emphases for the eplanned observational program are discussed.
Author: J. D. Kurfess Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
The Oriented Scintillation Spectrometer Experiment (OSSE) for the Gamma Ray observatory is described. OSSE uses four identical NaI(Tl)-CsI(Na) phoswich detectors to provide gamma-ray line and continuum detection capability in the 0.05-10 MeV energy range. Additioal gamma-ray and neutron detection capability is achieved above 10 MeV. Each detector has a CsI annular shield and a tungsten alloy collimator which define a 5 x 11 deg (FWHM) field-of-view. The detectors have independent, single-axis orientation systems which permit offset pointing to provide source-background subtraction. The sensitivity for line gamma rays the 0.05-10 MeV region will be .00002 - 00003 photons/cc-s for a .000001-second observation period. The several modes of data acquisition and the emphases for the eplanned observational program are discussed.
Author: Publisher: ISBN: Category : Languages : en Pages : 68
Book Description
The Oriented Scintillation Spectrometer Experiment (OSSE) on the Arthur Holly Compton Gamma Ray Observatory satellite uses four actively- shielded NaI(Tl)- CsI (Na) phoswich detectors to provide gamma-ray line and continuum detection capability in the 0.05 - 10 MeV energy range. The instrument includes secondary capabilities for gamma-ray and neutron detection between 10 and 250 MeV. The detectors have 3.8 degrees x 11.4 degrees (FWHM) fields-of-view defined by tungsten collimators. Each detector has an independent, single-axis orientation system which permits offset pointing from the spacecraft Z-axis for background measurements and multi-target observations. The instrument, its calibration and performance are described.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722866662 Category : Languages : en Pages : 44
Book Description
An overview is given of the Gamma Ray Observatory (GRO) mission. Detection of gamma rays and gamma ray sources, operations using the Space Shuttle, and instruments aboard the GRO, including the Burst and Transient Source Experiment (BATSE), the Oriented Scintillation Spectrometer Experiment (OSSE), the Imaging Compton Telescope (COMPTEL), and the Energetic Gamma Ray Experiment Telescope (EGRET) are among the topics surveyed. Unspecified Center ...
Author: Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
Key results obtained by the OSSE instrument during the first four years of the Compton Gamma Ray Observatory mission are presented. OSSE has undertaken extended observations of the gamma ray emission from the galactic center region and found the positron annihilation radiation to be consistent with a two-component model: a spheroidal component located at the galactic center and a weaker galactic disk component. Simultaneous observations with the SIGMA imaging instrument have provided the first low-energy gamma ray spectrum of the diffuse continuum emission from the galactic center region. Results on galactic sources include the spectral observations of two new rotation-powered pulsars, PSR 1509-58 and Vela, the discovery of 110 keV cyclotron emission from the Be X-ray binary A0535+26, and the discovery that galactic black hole transients have two spectral classes: thermal and power-law. Extragalactic sources also have two spectral classes. Seyfert galaxies are typified by thermal spectral with exponential cutoffs from 50-300 keV, and blazars which exhibit power-law spectra that extend into the EGRET energy range. Blazar spectra also often have a spectral break in the MeV region.
Author: Publisher: ISBN: Category : Languages : en Pages : 28
Book Description
We report on ~120 days of observations of Cygnus X-1 with OSSE onboard the Compton Observatory. Emission is detected in the range 50 keV to 1 MeV and we find evidence for a continuum of hard X-ray flux levels rather than the existence of distinct flux states. Comparisons of the source spectra with various theoretical models show that an exponentially truncated power law best describes the average spectrum in the OSSE energy band. Although we have measured a new minimum in the hard X-ray flux from the source, no evidence was found for either a broad 1 MeV feature or a narrow 511 keV line previously reported in association with a low flux state. Upper limits on such emission features are an order of magnitude lower than earlier reported detections. The 5.6-day periodicity of the source measured at optical wavelengths was not detected with a sensitivity to the rms modulation fraction of 5% in the 60-140 keV energy band.
Author: Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
The discovery of gamma-ray line emission in the 3-7 MeV range from the Orion complex was recently reported (Bloemen et al. 1994). The observed Compton Telescope (COMPTEL) spectrum suggested that the emission results from the de-excitation of excited states of 12C and 16O. We report on a search for these lines using the Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory (CGRO) during a 5-week observation from April to June in 1995. The OSSE detectors were pointed midway between the Orion A and B radio sources in three different viewing configurations. We find no compelling evidence for line emission near 4.4 or 6.1 MeV. The sensitivity of the OSSE measurements is dependent on the widths of the reported C and O lines and on the source location and spatial extent. A point source at the flux level reported by COMPTEL and located on-axis would have been detected by OSSE at ~7 sigma and ~5 sigma levels of confidence for narrow and broad lines, respectively. A spatially-distributed source of the same strength with a distribution following the intense CO emission localized around Orion A and Orion B (see Maddalena et al. 1986) would have been detected by OSSE at ~3.5 sigma and ~2.5 sigma, respectively. Thus, these OSSE observations require that any gamma-ray line source must be even more extended to be consistent with the reported COMPTEL intensity.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Describes the Oriented Scintillation Spectrometer Experiment (OSSE) of the National Aeronautics and Space Administration (NASA), which is designed to take comprehensive observations of astrophysical sources in the 0.05-10 MeV energy range. Allows observations of a gamma-ray source to be alternated with observations of nearby background regions. Explains that OSSE has produced observations of the energy spectrum of nuclear lines in solar flares, the radioactive decay of nuclei in supernova remnants, and the signature of matter-antimatter annihilation in the galactic center region.
Author: J. D. Kurfess
Author: J. D. Kurfess
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Author: United States. National Aeronautics and Space Administration
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Author: National Aeronautics and Space Administration (NASA)
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Author: M. Signore
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