New hard X-ray/gamma-ray telescope - Welcome-1

Details New hard X-ray/gamma-ray telescope - Welcome-1 New hard X-ray/gamma-ray telescope - Welcome-1

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1734...44t&link_type=abstract

In: Gamma-ray detectors; Proceedings of the Meeting, San Diego, CA, July 21, 22, 1992 (A93-30101 11-35), p. 44-55.

Astronomy and Astrophysics

Astronomy

2

Gamma Ray Astronomy, Gamma Ray Telescopes, Radiation Detectors, X Ray Sources, X Ray Telescopes, Active Galactic Nuclei, Balloon-Borne Instruments, Crab Nebula, Supernova Remnants

Scientific paper

We have developed a low background hard X-ray/gamma-ray telescope for balloon-borne experiments. The telescope called Welcome-1 (Well type Compound Eye) utilizes newly developed well-type phoswich counters. In the well-type phoswich counter, the background from external and internal sources are reduced significantly, Welcome-1 is designed for observation in the energy range from 60 keV to 800-1000 keV. The effective area of Welcome-1 is 740 sq cm at 122 keV and 222 sq cm at 511 keV line. We flew Welcome-1 in 1990 and 1991 to detect hard X-rays from SN1987A, PSR1509-58, Cen-A and others. The background levels at an altitude of 4g/sq cm are 1 x 10 exp -4/sq cm photons/s/keV at 122 keV and 3 x 10 exp -5 photons/sq cm/s/keV at 511 keV. The data obtained during the flight shows that the detector in fact has the 3 sigma sensitivity of about a few x 10 exp -6 photons/sq cm/s/keV and about 10 exp -4 photons/sq cm/s in a 10 exp 4 s observation for the continuum spectrum and line spectrum, respectively.

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