Title题目    Nuclear level densities of superheavy nuclei    Speaker报告人    Dr. Timur M. Shneydman  Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing and Joint Institute for Nuclear Research, Dubna  Date日期    2013-09-10 AM 10:00 Tuesday  Venue地点    Conference Hall 322, ITP/理论物理所322报告厅  Abstract摘要    Using the single-particle spectra calculated with the modified two center shell model (TCSHM) we define the microscopic level density of superheavy nuclei in alpha-decay chains of $^{296,298,300}$120. The extracted values of the level density parameters are compared with their phenomenological values used in calculation of the survival of excited heavy nuclei. The dependence of the level density parameter on shell effects is established. The minima in this dependence correspond to the closed shell or sub-shell nuclei. The obtained properties of superheavy nuclei supports that the next doubly magic nucleus beyond $^{208}$Pb is $Z geq 120$. We also found the strong evidences of the shell closure at $N = 184$.  Contact所内联系人    周善贵