A review of acticities by the Japan-Brazil collaboration is presented. The collaboration work started in 1988 and launched 8 balloons in total. A new detector featuring low background environment (Welcome-1 detector) has been developed for the experiment. Using the detector Crab nebula can be observed with S/N ratio around unity between 100 and 200keV. In 1990,we succeeded in observing SN1987A and obtained an upper limit to the ^<57>Co 122keV line flux at 1.0×10^<-4>cm^<-2>s^<-1> which corresponds to 3.4 times of the solar ^<57>Co/^<56>Co abundance ratio. We subsequently observed Crab, Vela Pulsar (SNR), Cen-A (AGN), PSR1509-58 (SNR) and GX339-4 (BHC) in 1991. We will present preliminary results for these observations.
ブラジルにおける大気球実験 : 1991 年度の報告とまとめ
SA0167043.pdf
(514.13KB)
