The Chacaltaya air shower array has continued to be used for the accumulation of muon-poor air showers in an attempt to find evidence of gamma rays in the primary cosmic radiation. A progress report is given here, and some upper limits to the intensities are presented for possible point sources and for galactic and isotropic backgrounds.
The Mt. Chacaltaya air shower array in Bolivia has been used to collect data suitable for deriving the primary energy spectrum above 1014 eV. The spectrum was reported at the London Conference (Bradt et al. 1966). Since that time the array has been used to record showers above 107 particles in size. This note reports the results of the increased statistics on the upper end of the spectrum and also describes the results of some calculations designed to verify the validity of the method used. The spectrum reported previously is not changed appreciably by these considerations.
Spark chambers forming a 5 -m h r r a y havc been operatecl at the center of the Chacaltaya air shower array in Bolivia at an altitude of 5 200 in. Double-cored showers and steep-coredshowers are observed, ancl a conlparison is made with observations at sea level. The location of the electronlagnetic core is comparecl with that of the nucleonic core.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.