EMMA - A New Underground Cosmic-Ray Experiment

Abstract

A new type of cosmic-ray experiment is under construction in the Pyh\"asalmi mine in the underground laboratory of the University of Oulu, Finland. It aims to study the composition of cosmic rays at and above the knee region. The experiment, called EMMA, will cover approximately 150 square-metres of detector area. The array is capable of measuring the multiplicity and the lateral distribution of underground muons, and the arrival direction of the air shower. The full-size detector is expected to run by the end of 2007.Comment: Extended and updated TAUP2005 Proceedings contribution. 8 pages, 5 figures (part in colour). Preprint not submitte