Recent achievements in the study of highly excited nuclei: Thermal pairing and giant dipole resonance in not rotating nuclei

Tuesday 18 Nov 2014, 11:00 → 12:30 Asia/Tokyo

Main Research Bldg. 2F Rom 203 (RIKEN Wako)

Title: Recent achievements in the study of highly excited nuclei: Thermal pairing and giant dipole resonance in not rotating nuclei Speaker: Dr. Nguyen Dinh Dang Date: Tuesday, November 18th, 11:00 - Place: Room 203, RIBF building Abstract: Recent experimental and theoretical results are reported, which show the effect of thermal pairing in highly excited nuclei. 1) Latest experimental data demonstrate that thermal pairing included in the phonon damping model (PDM) [1] is responsible for the nearly constant width of the giant dipole resonance (GDR) at low temperature T < 1 MeV [2]. 2) Thermal pairing is included for the first time in the thermal shape fluctuations model (TSFM) to make it able to correctly describe the GDR width in open-shell nuclei at low T [3]. 3) It is shown that the enhancement observed in the recent experimentally extracted nuclear level densities in 104Pd at low excitation energy and various angular momenta is the first experimental evidence of the pairing reentrance in a finite nucleus [4]. 4) In the study of GDR in highly excited nuclei, the phonon damping model (PDM) has been extended to include finite angular momenta. The results of calculations within the PDM are found in excellent agreement with the latest experimental data of GDR in the compound nucleus 88Mo [5]. References [1] N. Dinh Dang and A. Arima, Phys. Rev. Lett. 80 (1998) 4145, Nucl. Phys. A 636 (1998) 427. [2] N. Dinh Dang and N. Quang Hung, Phys. Rev. C 86 (2012) 044333; B. Dey et al., Phys. Lett. B 731 (2014) 92. [3] A.K. Rhine Kumar, P. Arumugam, and N. Dinh Dang, Phys. Rev. C 90 (2014) 044308. [4] V.M. Datar, A. Mitra, D.R. Chakrabarty, N. Dinh Dang, N. Quang Hung, and B.K. Agrawal, in preparation. [5] N. Dinh Dang, M. Ciemala, M. Kmiecik, and A. Maj, Phys. Rev. C 87 (2013) 054313.