  We extract pairing gap in $^{184}$W at finite temperature for the first time
from the experimental level densities of $^{183}$W, $^{184}$W, and $^{185}$W
using "thermal" odd-even mass difference. We found the quenching of pairing gap
near the critical temperature $T_c = 0.47$ MeV in the BCS calculations. It is
shown that the monopole pairing model with a deformed Woods-Saxon potential
explains the reduction of the pairing correlation using the partition function
with the number parity projection in the static path approximation plus
random-phase approximation.
