Quenching of pairing gap at finite temperature in 184W

We extract the pairing gap in 184W at finite temperature for the first time from the experimental level densities of 183W, 184W, and 185W using the 'thermal' odd-even mass difference. We found the quenching of the pairing gap near the critical temperature Tc=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