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=O.1/T-1 varie
s in proportion to temperature in the normal state, and 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 2 Delta=4.0k(B)T(c). Ru-101 NQR study indicat
es that CeRu2 is an s-wave and strong-coupling superconductor.