We present measurements of the NQR spectrum and the nuclear spin latti
ce relaxation rate, 1/T-1, of Ru-101 in superconducting CeRu2 from 1.9
K to 10 K. From the NQR spectrum, the electric quadrupole interaction
parameters were determined to be nu(Q) = 13.2 MHz and eta = 0.1/T-1 v
aries in proportion to temperature in the normal state, has the Hebel-
Slichter coherence peak just below the superconducting transition temp
erature, T-C, of 6.2 K, and decreases exponentially at low temperature
s with the energy gap of 24 = 4.0 k(B)T(C). Ru-101 NQR study indicates
that CeRu2 is an s-wave and strong-coupling superconductor.