Systematical calculations on superheavy nuclei.ppt

Systematical calculations on superheavy nuclei Zhongzhou REN Department of Physics, Nanjing University, Nanjing, China Center of Theoretical Nuclear Physics, National Laboratory of Heavy-Ion Accelerator, Lanzhou, China Outline  Introduction Nuclear structure calculations on superheavy nuclei (RMF, SHF, MM) Alpha decay: density-dependent cluster model (DDCM) Spontaneous Fission: new formula on half-lives of SF. Summary 1. introduction: experiments Z=110 (Ds), 111(Rg), 112 were produced at GSI, Hofmann, Muenzenberg…. Z. Phys. A, 1995-1996 Z=114-116, 118, at Dubna, by Oganessian et al…. Nature, 1999; PRL. 1999;PRC, 2000-2005. Z=110-111, new results, at Berkeley, PRL 2004…. Z=113, RIKEN, Morita,…, J. P. S. J., 2004. 270Hs, Duellman, Turler, …, Nature 2003, EPJA 04. 265Bh, Lanzhou, Gan, Qin, …, EPJA 2004. 1. introduction: theory. J. A. Wheeler, 1950s: Superheavy nuclei Werner and Wheeler, Phys. Rev., 109 (1958) 126. 1960s-2000s, macroscopic-microscopic model (MM): Nilsson et al, Z=114 and N=184…. 1970s-2000s: Skyrme-Hartree-Fock (SHF) Model; Z=126? N=184? 1990s-2000s: Relativistic Mean-Field model : Z=120 ? N=184? Spherical or deformed for superheavy nuclei ??? 2. nuclear structure calculations  2.1. RMF calculations on superheavy nuclei Z=90-120：binding energies, deformations,… Compare RMF with experimental data RMF predictions on experiments Ren et al. , PRC (2002-2005) ; NPA(2003-2005)… 2. 2 New idea: shape coexistence and superdeformation Ren and Toki, 2001, NPA, Ren et al,… 2.3. Shape coexistence from other models SHF model and MM model Nature 433, 2005. Atom. Data. Nucl. Data Tab. 77 (2001) 311 . 2.1 RMF results and discussion Nuclei: Z =94—120; N=130—190. Comparison of theoretical binding energy with exprimental data. Comparison of theoretical alpha decay energy with exprimental data. Comparison of theoretical quadrupole deformation