Evidence for changing of cosmic ray composition between 10(17) and 10(18) eV from multicomponent measurements
The average mass composition of cosmic rays with primary energies between 10(17) and 10(18) eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the muon density as a function of energy. The results show that the composition is changing from a heavy to lighter mix as the energy increases.
Abu-Zayyad
T
High Energy Astrophysics Institute, University of Utah, Salt Lake City, Utah 84112, USA.
Belov
K
Bird
DJ
Boyer
J
Cao
Z
Catanese
M
Chen
GF
Clay
RW
Covault
CE
Cronin
JW
Dai
HY
Dawson
BR
Elbert
JW
Fick
BE
Fortson
LF
Fowler
JW
Gibbs
KG
Glasmacher
MA
Green
KD
Ho
Y
Huang
A
Jui
CC
Kidd
MJ
Kieda
DB
Knapp
BC
Ko
S