A hard X-ray telescope and its observation of the Crab pulsar

Details A hard X-ray telescope and its observation of the Crab pulsar A hard X-ray telescope and its observation of the Crab pulsar

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cha%26a..11..179d&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 11, Issue 3, p. 179-185.

Astronomy and Astrophysics

Astrophysics

Instruments

Scientific paper

The hard X-ray phoswich telescope, HAPI-1, is described. It was designed for making observations on board high-flying balloons. The telescope comprises a 145 cm2 primary crystal of 5 cm thick Cs I(T1), effectively shielded over the lower 2π steradians by a 5 cm thick NaI(T1) crystal and has a field of view of approximately 4° HWHM determined by a graded shield and a 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 obsserved by HAPI-1 in a balloon flight on 1984 May 23 in the energy range 20 to 200 keV and the observed result is presented.

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