Effective density-dependent pairing forces of zero range are adjusted on ga
p values in T = 0,1 channels calculated with the Paris force in symmetric n
uclear matter. General discussions on the pairing force are presented. In c
onjunction with the effective k mass the nuclear pairing force seems to nee
d very little renormalization in the T = 1 channel. The situation in the T
= 0 channel is also discussed. [S0556-2813(99)00412-4].