CREAM is a balloon-borne experiment aimed at the study of the primary cosmic rays with Z=1-28 in the energy range 10¹²-10¹⁵ eV.
It is an effort to extend the direct measurements performed in the past by experiments like JACEE or RUNJOB, in order to study the problem of the origin and acceleration mechanisms of cosmic rays.
CREAM will exploit the ULDB technique - Ultra Long Duration Balloons - being developped by NASA to flight for 60-100 days and perform the measurements with unprecedented statistical precision.