Study of Low Energy Gamma-Rays from Supernova Remnants (SM1987A) Abroard Balloons

We have carried out balloon-borne experiments in collaboration with the INPE （Institute of Space Research） Brazilian balloon group。主要物体是发射大的平流层气球，并从天文物体中观察硬X射线/伽马射线（SN 1987 A）。由日本人组准备的探测器（东京大学、ISAS等）。发射行动是对巴西人的责任，而无线电通信是对日本群体的责任。1988年，Pocos de Caldas在1988年11月24日和28日发射了两个气球。一个气球（5x 10 ^6英尺3）携带一个硬X射线探测器（187公斤）和另一个（20 x10 ^6英尺3）携带一个伽马射线探测器（865公斤）。在过去两年里，我们转移到Cachoerira Paulista的INPE气球基地（4500 34 W，22394 S）。我们已经建立了一个交流设施，允许在几年内进行频繁的竞选活动。使用设施，我们发射了一个气球，携带了我们新的硬X射线/伽马射线探测器（欢迎1（Well型复合眼睛-1，670公斤））。1989年，一个气球（6.6 × 10 ^6英尺3）于12月22日发射。不幸的是，在真空条件下，电子产品在真空条件下可能会失败，我们无法获取科学数据。星际摄像机系统、指挥系统和其他设备，工作良好，并为探测器提供了我们的技术信息。1990年，两个气球（6.6和8.8 × 10 ^6英尺3）在11月14日和10月29日发射。在第一次飞行中，我们无法控制我们探测器的方向，使其无法控制电信系统的故障和获取背景数据。在第二架飞机上，我们成功地观察了SN 1987 A，大约4小时。数据现在正在分析中。background data at the ceiling altitude shows that the sensitivities-a few X10^\-6>/cm^2/s/keV and-10^\-4>/cm^2/s are attained for the continuum spectrum and line spectrum respectively。这些价值观在气球出生实验中使用的前一种探测器类型超过5次。

We have carried out balloon-borne experiments in collaboration with the INPE (Institute of Space Research) Brazilian balloon group. The major objectives are to launch large stratospheric balloons and to observe hard X-rays/gamma-rays from astronomical objects such as SN1987A. The detectors were prepared by the japanese group (Univ. of Tokyo, ISAS and others). The launching operation was responsibility of the brazilian side while the radio communication was responsibility of the Japanese group.In 1988, two balloons were launched from Pocos de Caldas on November 24 and 28. One balloon (5X10^6ft^3) carried the hard X-ray detector (187kg) and the other (20X10^6ft^3) carried the gamma-ray detector (865 Kg).In the last two years, we moved to the INPE balloon base in Cachoerira Paulista (45 00 34W, 22 39 44S). We have set up a communication facility that allows frequent campaign for several years. Using the facility, we have launched balloons carring our new hard X-rays/gamma rays detector (Welcome1 (Well-type Compound Eye-1, 670kg)).In 1989, one balloon (6.6X10^6ft^3) was launched on Dec. 22. Unfortunately, due to failure of the electronics in vacuum condition at the ceiling altitude, we could not take scientific data. The star camera system, command system and other equipment, however worked well and gave us technical information on the detector.In 1990, two balloons (6.6 and 8.8X10^6ft^3) were launched on Nov. 14 and Nov. 29. In the first flight, we could not control the direction of our detector due to failure of the telecommand system and took background data. In the second flight, we succeeded in observing SN1987A for about 4 hours. Data is now under analysis. The background data at the ceiling altitude shows that the sensitivitiesーa few X10^<-6>/cm^2/s/keV and ー10^<-4>/cm^2/s are attained for the continuum spectrum and line spectrum respectively. These values are about 5 times superior to the previous type of detectors used in balloon-borne experiments.