Response to cosmic rays of the large-angle electromagnetic shower calorimeter of the CLAS detector

The measurement of the response of the large-angle electromagnetic shower calorimeter (LAC) of the CLAS detector to minimum ionizing particles is reported. The experimental set-up and the adopted procedures are described. The results of the light attenuation length in the calorimeter, the light output and the resolution of the interaction point reconstruction are discussed. The performances of the LAC match well with those required. ( 2000 Elsevier Science B.V. All rights reserved. PACS: 29.40.Vj