Optimization of counting times for short-lived gamma-ray emitters in air filter samples

2006 ◽  
Vol 64 (10-11) ◽  
pp. 1329-1332
Author(s):  
M. Korun
2018 ◽  
Vol 27 (10) ◽  
pp. 1844010 ◽  
Author(s):  
Alicia López-Oramas ◽  
Oscar Blanch ◽  
Emma de Oña Wilhelmi ◽  
Alba Fernández-Barral ◽  
Daniela Hadasch ◽  
...  

The improvement on the Imaging Air Cherenkov Technique (IACT) led to the discovery of a new type of sources that can emit at very high energies: the gamma-ray binaries. Only six systems are part of this exclusive class. We summarize the latest results from the observations performed with the MAGIC telescopes on different systems as the gamma-ray binary LS I [Formula: see text]303 and the microquasars SS 433, V404 Cygni and Cygnus X-1, which are considered potential VHE gamma-ray emitters. The binary system LS I [Formula: see text] 303 has been observed by MAGIC in a long-term monitoring campaign. We show the newest results of our search for super-orbital variability also in context of contemporaneous optical observations. Besides, we will present the results of the only super-critical accretor known in our galaxy: SS 433. We will introduce the VHE results achieved with MAGIC after 100[Formula: see text]h of observations on the microquasar Cygnus X-1 and report on the microquasar V404 Cyg, which has been observed with MAGIC after it went through a series of exceptional X-ray outbursts in June 2015.


2020 ◽  
Vol 189 (2) ◽  
pp. 172-181
Author(s):  
Yuki Morishita ◽  
Hiroshi Usami ◽  
Yoshihiro Furuta ◽  
Katsunori Aoki ◽  
Koji Tsurudome ◽  
...  

Abstract We developed a remote continuous air monitoring (RCAM) system. The RCAM system consisted of a personal air monitor and a robot. The personal air monitor (poCAMon, SARAD, Germany) had a 400-mm2 ion-injected silicon detector and a membrane air filter with 25 mmφ. The personal air monitor provides the alpha energy spectra for any measurement time interval. Demonstration measurements were taken underground at the Mizunami Underground Research Laboratory and at a poorly ventilated concrete building. The RCAM system was remotely operated and successfully measured the 222Rn progeny even though the relative humidity was almost 100%. In the measured alpha spectra, the peaks of 218Po (6.0-MeV alpha) and 214Po (7.7-MeV alpha) were clearly identified. Our developed monitor is promising for alpha dust monitoring in a high gamma-ray environment or contaminated areas where a worker cannot safely physically enter.


2005 ◽  
Vol 263 (1) ◽  
pp. 253-257 ◽  
Author(s):  
P. A. Aarnio ◽  
J. J. Ala-Heikkilä ◽  
T. K. Ansaranta ◽  
T. T. Hakulinen

2013 ◽  
Vol 81 ◽  
pp. 362-365 ◽  
Author(s):  
A. Gudelis ◽  
I. Gorina ◽  
T. Nedveckaitė ◽  
P. Kovař ◽  
P. Dryak ◽  
...  

1988 ◽  
Author(s):  
Michael T. Wolff ◽  
Mark D. Leising
Keyword(s):  

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