Event calendar file
3-11 July 2007
Merida, Mexico
Mexico/General timezone
- icrc2007@icrc2007.unam.mx
Support
OG.1.1
Cosmic ray primary composition in the energy range 10-1000 TeV obtained by passive balloon-borne detector: re-analysis of the RUNJOB data
Speakers
- Dr. Vladimir KOPENKIN
Primary authors
- Dr. Vladimir KOPENKIN (Skobeltsyn Institute of Nuclear Physics, Moscow State University, Waseda University)
Abstract content
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.
