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Proceedings Paper

New hard x-ray/gamma-ray telescope Welcome-1
Author(s): Tadayuki Takahashi; Shuichi Gunji; Masaharu Hirayama; Tuneyoshi Kamae; S. Miyazaki; Yutaro Sekimoto; Masaaki Tanaka; Takayuki Tamura; Noriko Y. Yamasaki; Takamasa Yamagami; Masaharu Nomachi; Heihachiro Murakami
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Paper Abstract

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.

Paper Details

Date Published: 22 December 1992
PDF: 12 pages
Proc. SPIE 1734, Gamma-Ray Detectors, (22 December 1992); doi: 10.1117/12.138605
Show Author Affiliations
Tadayuki Takahashi, Univ. of Tokyo (Japan)
Shuichi Gunji, Univ. of Tokyo (Japan)
Masaharu Hirayama, Univ. of Tokyo (Japan)
Tuneyoshi Kamae, Univ. of Tokyo (Japan)
S. Miyazaki, Univ. of Tokyo (Japan)
Yutaro Sekimoto, Univ. of Tokyo (Japan)
Masaaki Tanaka, Univ. of Tokyo (Japan)
Takayuki Tamura, Univ. of Tokyo (Japan)
Noriko Y. Yamasaki, Univ. of Tokyo (Japan)
Takamasa Yamagami, Institute of Space and Astronautical Science (Japan)
Masaharu Nomachi, KEK (Japan)
Heihachiro Murakami, Rikkyo Univ. (Japan)

Published in SPIE Proceedings Vol. 1734:
Gamma-Ray Detectors
Elena Aprile, Editor(s)

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