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Full-Text Articles in Physical Sciences and Mathematics
Development Of An Orthogonal-Stripe Cdznte Gamma Radiation Imaging Spectrometer, John R. Macri, Boris A. Apotovsky, J F. Butler, M L. Cherry, Brian K. Dann, A Drake, F P. Doty, T G. Guzik, K Larson, M Mayer, Mark L. Mcconnell, James M. Ryan
Development Of An Orthogonal-Stripe Cdznte Gamma Radiation Imaging Spectrometer, John R. Macri, Boris A. Apotovsky, J F. Butler, M L. Cherry, Brian K. Dann, A Drake, F P. Doty, T G. Guzik, K Larson, M Mayer, Mark L. Mcconnell, James M. Ryan
Space Science Center
We report performance measurements of a sub-millimeter resolution CdZnTe strip detector developed as a prototype for astronomical instruments operating with good efficiency in the 30-300 keV photon energy range. The prototype is a 1.4 mm thick, 64×64 contact stripe CdZnTe array of 0.375 mm pitch in both dimensions. Pulse height spectra were recorded in orthogonal-stripe coincidence mode which demonstrate room-temperature energy resolution <10 keV (FWHM) for 122 keV photons with a peak-to-valley ratio >5:1. Good response is also demonstrated at higher energies using a coplanar grid readout configuration. Spatial resolution capabilities finer than the stripe pitch are demonstrated. We present the image of a 133Ba source viewed through a collimator …
Large-Area Submillimeter Resolution Cdznte Strip Detector For Astronomy, James M. Ryan, John R. Macri, Mark L. Mcconnell, Brian K. Dann, M L. Cherry, T G. Guzik, F P. Doty, Boris A. Apotovsky, J F. Butler
Large-Area Submillimeter Resolution Cdznte Strip Detector For Astronomy, James M. Ryan, John R. Macri, Mark L. Mcconnell, Brian K. Dann, M L. Cherry, T G. Guzik, F P. Doty, Boris A. Apotovsky, J F. Butler
Space Science Center
We report the first performance measurements of a sub-millimeter CdZnTe strip detector developed as a prototype for space-borne astronomical instruments. Strip detector arrays can be used to provide two-dimensional position resolution with fewer electronic channels than pixellated arrays. Arrays of this type and other candidate technologies are under investigation for the position-sensitive backplane detector for a coded-aperture telescope operating in the range of 30 - 300 keV. The prototype is a 1.4 mm thick, 64 multiplied by 64 stripe CdZnTe array of 0.375 mm pitch in both dimensions, approximately one square inch of sensitive area. Pulse height spectra in both …
The Black-Hole Candidate Gro J0422+32: Mev Emission Measured With Comptel., R Van Dijk, K Bennett, W Collmar, R Diehl, W Hermsen, G G. Lichti, Mark L. Mcconnell, James M. Ryan, V. Schonfelder, A W. Strong, J Van Paradijs, C Winkler
The Black-Hole Candidate Gro J0422+32: Mev Emission Measured With Comptel., R Van Dijk, K Bennett, W Collmar, R Diehl, W Hermsen, G G. Lichti, Mark L. Mcconnell, James M. Ryan, V. Schonfelder, A W. Strong, J Van Paradijs, C Winkler
Physics & Astronomy
On Aug. 5, 1992, BATSE detected the bright soft X-ray transient GRO J0422+32,also known as Nova Per 1992. The COMPTEL instrument (0.75-30MeV) aboard the Compton Gamma-Ray Observatory (CGRO) observed this black-hole candidate twice. During the first observation, which started when the X-ray flux was at its maximum, GRO J0422+32 was detected between 1 and 2MeV. The flux in this energy range was higher than expected from an extrapolation of the standard Sunyaev-Titarchuk Comptonisation model fits to the contemporaneous OSSE and SIGMA data. We discuss several models that may explain the total hard-X/γ-ray spectrum, including the generalised Comptonisation model from Titarchuk. …