Quenching of pairing gap at finite temperature in 184W

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