Programme

O.3 -- Oral, IWTCP-2

Date: Tuesday, 29-07-2014

Time: 15h10 - 15h30

Pairing reentrance phenomenon in hot rotating nuclei

Nguyen Quang Hung

School of Engineering, Tan Tao University, Tan Tao University Avenue, Tan Duc E.City, Duc Hoa, Long An Province, Vietnam

Pairing reentrance phenomenon of highly rotating excited (hot) nuclei is studied within the Bardeen-Cooper-Schrieffer (BCS)-based approach, taking into account the effect of thermal fluctuations on the pairing field at finite temperature and angular momentum within the pairing model plus noncollective rotating along the symmetry axis. The results obtained for the pairing gaps, total energies, heat capacities, and level densities show that the thermal fluctuations smooth out the superfluid-normal phase transition and leads to the appearance of a thermally assisted pairing or pairing reentrance in hot rotating nuclei, which can be clearly seen in the behavior of pairing gaps obtained at finite temperature and angular momentum [1]. Moreover, in addition to the pairing gap, the anomalous enhancement of level density also serves as a good indicator of the appearance of the pairing reentrance [2]. This feature has been recently confirmed by an experimental analysis of the reaction ${12}^C$+${93}^Nb$ --> ${105}^Ag^*$ --> ${^104}^Pd^*$ +d at the incident energy of 40 – 45 MeV in which an observation of the enhancement of nuclear level density at finite excitation energy and total angular momentum has been reported. References: N. Quang Hung and N. Dinh Dang, Phys. Rev. C 78, 064315 (2008). N. Quang Hung and N. Dinh Dang, Phys. Rev. C 84, 054324 (2011).

Presenter: Nguyen Quang Hung