Activity measurement of gamma-ray emitters in aerosol filters exposed in Lithuania, in March–April 2011

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


Author(s):  
Xiaoliang Chen ◽  
Zhendong Fan ◽  
Xiaoxian Chen ◽  
Dingsheng Hu

China Experimental Fast Reactor (CEFR) has completed physics start-up tests in 2010 and connected the grid on 40%FP in 2011. The reaction rate distribution, neutron spectrum are some important parameters for CEFR neutron field. In order to measure these parameters some low power irradiation tests using foil activation method have been done in CEFR core. Two kinds of special irradiation test subassemblies have been developed and fabricated for irradiation in CEFR core. And a digital high purity Germanium gamma-ray spectrometer system has been established for foil activity measurement. After dozens of low power irradiation tests in CEFR core, the radial and axial distribution of 235U and 238U fission reaction rate have been measured. The distribution of 238U capture reaction rate in CEFR core was also obtained in these tests. The experimental values of reaction rate are according with the calculation values well. Neutron spectrum was measured by means of multifoil activation method. And a neutron spectrum adjusting code was also compiled to determine the neutron spectrum.


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

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