Pairing effect in thermal shape fluctuation model on the width of giant dipole resonance

Abstract

We present an approach that includes temperature-dependent shell effects and fluctuations of the pairing field in the thermal shape fluctuation model (TSFM). We apply this approach to study the width of giant dipole resonance (GDR) in ${}^{97}$Tc, ${}^{120}$Sn and ${}^{208}$Pb. Our results demonstrate that the TSFM that includes pairing fluctuations can explain the recently observed quenching in the GDR width. We also show that to validate pairing prescriptions and the parameters involved, we require more and precise data.

Comments: Accepted for publication in Physical Review C