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<title>30th International Cosmic Ray Conference</title>
<description>The 30th International Cosmic Ray Conference will be held from July 3, 2007 to July 11, 2007 in Merida, Yucatan, Mexico.</description>
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<startDate>2007-07-03T08:00:00</startDate>
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 <title>Cosmic ray primary composition in the energy range 10-1000 TeV obtained  by passive balloon-borne detector: re-analysis of the RUNJOB data</title>
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   <title>Dr.</title>
   <name first="Vladimir" middle="" last="Kopenkin"></name>
   <organization>Skobeltsyn Institute of Nuclear Physics, Moscow State University, Waseda University</organization>
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   <title>Dr.</title>
   <name first="Vladimir" middle="" last="Kopenkin"></name>
   <organization>Skobeltsyn Institute of Nuclear Physics, Moscow State University, Waseda University</organization>
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  <name>Merida, Mexico</name>
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 <duration>00:12</duration>
 <abstract>We present an alternative analysis of the data reported by the 
balloon-borne experiment RUNJOB.
According to RUNJOB, the average mass number of primary cosmic ray particles
is constant up to 1 PeV.
Here we show that there is more than one solution, which reproduce
the observational data.
It is demonstrated that, contrary to the wide-spread opinion, the RUNJOB
data are not inconsistent with an increase of  
the average mass near the knee region of the cosmic ray  spectrum.
Considering large statistical and systematic errors, 
especially in the high energy region, none of these two possibilities, 
heavy dominant composition, or proton dominant composition,
can be completely ruled out.</abstract>
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