Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987rstc.rept...39d&link_type=abstract
In its JPRS Report: Science and Technology. China p 39 (SEE N88-11688 03-13) Transl. into ENGLISH from Tianti Wuli Xuebao (Beiji
Astronomy and Astrophysics
Astronomy
Functional Design Specifications, X Ray Astronomy, X Ray Telescopes, Balloon-Borne Instruments, Pulsars
Scientific paper
A hard X-ray phoswich telescope, HAPI-1, is described that was designed to make observations of high flying balloons. The telescope is comprised of a 145 cm primary crystal of 5 mm thick CsI (T1) actively shielded over the lower 2 steradians by a 5 cm thick NaI (T1) crystal and has a field of view of approximately 4 deg HWHM determined by a graded shield and collimator. The scintillation pulses originating in CsI and NaI crystals are distinguished by pulse shape discrimination. All sub-systems of the telescope are described. The Crab pulsar was observed by HAPI-1 during a balloon flight on 23 May 1984, in the energy range of 20 to 200 KeV, and the observation results are presented.
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