CHARACTERISTICS OF MUONIC AND ELECTROMAGNETIC COMPONENTS FAR FROM THECORE OF GIANT AIR SHOWERS ABOVE 10(18) EV

In order to know the relative proportion of electrons, photons, and mu ons far from the cores of giant air showers, a detector with two scint illators sandwiching a lead plate of 1 cm thickness (leadburger) has b een built and placed at one corner of the Akeno Giant Air Shower Array (AGASA). Results obtained from data collected over an 18-month run ar e reported here. Lateral distributions and arrival time distributions of electrons. photons, and muons at around 1000 m-2500 m from the core for showers of energies larger than 10(18.0) eV have been determined. Our observations show that muons may be separated from electromagneti c components far from the shower core with a lead layer of 1 cm thickn ess, as suggested from Monte Carlo simulations using the MOCCA program . These studies show the MOCCA program to be a powerful simulation too l for further development of the detector design for the Pierre Auger project.