Speaker
Description
Pairing in highly excited nuclei
Nguyen Dinh Dang
Recent achievements in the study of pairing effects on the properties of highly excited nuclei are discussed. In particular, the nuclear level density and radiative gamma-ray strength function are simultaneously described within a consistent approach based on the exact pairing in good agreement with the experimental data for 170 - 172 Yb isotopes. The gamma-ray strength function is described within the phonon-damping model, which explains the increase of the width of the giant dipole resonance with temperature and angular momentum [1]. Exact pairing is also important in describing the data of angular-momentum gated nuclear level densities in hot rotating 96 Tc nucleus within the interval of excitation energy of 5 - 15 MeV [2]. It is also shown that pairing plays an important role in maintaining a nearly constant value of temperature at low excitation energy, and offers in this way a consistent description of the nuclear level density, which goes smoothly from the low-energy region below 5 MeV to the higher one (up to 20 MeV for Ni isotopes and 10 MeV for Yb isotopes) without the need for matching the constant-temperature model at low energy and the Fermi-gas one at high energy as often performed by using the composite level-density formula [3]. Finally, the effect of exact pairing is incorporated in the Skyrme-Hartree-Fock mean field to study the properties of bubble nuclei 22 O and 34 Si nuclei [4] at finite temperature.
References
[1] N. Quang Hung, N. Dinh Dang, and L.T. Quynh Huong, Phys. Rev. Lett. 118 (2017) 022502.
[2] B. Dey, D. Pandit, S. Bhattacharya, N. Quang Hung, N. Dinh Dang, L. Tan Phuc, D.Mondal, S. Mukhopadhyay, S. Pal, A. De, and S. R. Banerjee, Phys. Rev. C 96 (2017) 054326.
[3] N. Dinh Dang, N. Quang Hung, and L.T. Quynh Huong, Phys. Rev. C 96 (2017) 054321.
[4] L. Tan Phuc, N. Quang Hung, and N. Dinh Dang, Phys. Rev. C 97 (2018) 024311.
