Title :
A high performance anticoincidence rejection system for balloon borne MWPC
Author :
Ubertini, P. ; Bazzano, A. ; Patriarca, R. ; Ye, Z.
Author_Institution :
Inst. di Astrofisica Spaziale, Frascati, Italy
fDate :
2/1/1989 12:00:00 AM
Abstract :
The supernova SN 1987A has been observed in the range of hard X-rays (15-180 keV) and high-energy γ-rays (50-500 MeV) with a payload launched from the balloon facility of Alice Springs (Australia) during April 1987 and 1988. The low-energy detector based on a MWPC had a sensitive area of 500 cm2. In the second flight a complete plastic shield was added for the first time to the multiwire proportional counter (MWPC). By switching on the active shield, the background counting rate dropped from 4.2 to 2.8×10-4 counts/cm2-s-keV with no change in the deadtime of the counter. It is concluded that the use of a multitechnique rejection system for this kind of gaseous detector is advantageous
Keywords :
X-ray astronomy; X-ray detection and measurement; astronomical instruments; gamma-ray astronomy; gamma-ray detection and measurement; proportional counters; 15 to 180 keV; 50 to 500 MeV; AD 1987 to 1988; astronomical instruments; balloon borne MWPC; hard X-rays; high performance anticoincidence rejection system; high-energy γ-rays; multiwire proportional counter; plastic shield; supernova SN 1987A; Anodes; Collimators; Copper; Counting circuits; Energy resolution; Event detection; Payloads; Sparks; X-ray detection; X-ray detectors;
Journal_Title :
Nuclear Science, IEEE Transactions on
