1 / 34

Synthesis of superheavy elements with Z =112-120 in hot fusion reactions

Synthesis of superheavy elements with Z =112-120 in hot fusion reactions. Wang Nan College of Physics, SZU Collaborators: S G Zhou, J Q Li, E G Zhao, W. Scheid. Huzhou Apr. 13 th 2012. Contents. Introduction Formalism

hue
Download Presentation

Synthesis of superheavy elements with Z =112-120 in hot fusion reactions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Synthesis of superheavy elements with Z =112-120 in hot fusion reactions Wang Nan College of Physics, SZU Collaborators: S G Zhou, J Q Li, E G Zhao,W. Scheid Huzhou Apr. 13th 2012

  2. Contents • Introduction • Formalism • Results and discussions • Summary

  3. Periodic Table for Chemistry Elements

  4. • Experimental achievements: Super-heavy elements up to Z=118 have been synthesized experimentally. Z=107-113: cold fusion, 208Pb/209Bi based reactions by evaporating 1 or 2 neutrons (Rev.Mod.Phys.72(2000)733, Rep.Prog.Phys.61(1998)639) Z=112-118: 48Ca induced fusion reactions, 48Ca bombarding actinide targets by evaporating 3-5 neutrons (J.Phys.G34(2007)R165, NPA787(2007)343c) GSI: 107-112 Dubna: 112-118 Riken: 113 IMP: 259Db, 265Bh Question: How many nucleons can stay together in nucleus?

  5. Theoretical models for SHN production Macroscopic dynamical model S. Bjornholm and W.J. Swiatecki, NPA 391 (1982) 471 Fluctuation-dissipation model Aritomo et al. PRC 59 (1999) 796, Shen Int. J.Mod. E 17(2008)66 , Liu & Bao Phys.Rev.C 80(2009)034601 Nucleon collectivization model (Zagrebaev et al.PRC65(2001)014607) Dinuclear system model Adamian et al. NPA 618(1997) 176 Li, Wang et al. EPL 64 (2003) 750, Eur. Phys. J. A 24, 223 (2005) ,J. Phys. G32 (2006) 1143. Feng et al., NPA 771 (2006) 50 Huang et al, PRC 84 (2011) 064619 Wang, Zhao, Scheid , Zhou 85,041601(R)(2012) Other model Wang et al84, 061601(R) (2011)

  6. T capture P CF fusion • CN • EN evaporation Schematic picture of the formation of SHN Dinuclear system (used to describe deep inelastic collisions of heavy systems): V.V. Volkov, Phys. Rep. 44(1978)93 Evaporation residue cross section:

  7. Capture of two colliding nuclei Transmission probability calculated from barrier distribution: The value of 1 is 2-4 MeV less than the one of 2

  8. Formation of compound nucleus - Master equation Hamiltonian

  9. Dynamical Potential Energy Surface(Dyn-Pes) Driving potential(Potential Energy Surface) Dynamical deformation satisfy

  10. Dynamical Potential Energy Surface(Dyn-Pes)

  11. Survival probability of excited compound nucleus The thermal compound nucleus will decay by evaporating -ray,light particles and fission. The survival probabilities can be written as

  12. Results and discussions Capture and evaporation residue cross sections for Ca48+U238 Exp. Yu.Ts. Oganessian, et al., PRC 70 (2004) 064609

  13. Evaporation residue cross sections for Ca48+U238, Np237 Exp. Yu.Ts. Oganessian et al., PRC 70 (2004) 064609

  14. Evaporation residue cross sections for Ca48+Pu242, Pu244 Exp. Yu.Ts. Oganessian et al., PRC 70 (2004) 064609

  15. Evaporation residue cross sections for Ca48+Am243, Cm248 Exp. Yu.Ts. Oganessian et al., PRC 74.044602

  16. Evaporation residue cross sections for Ca48+ Bk249, Cf249 Exp. Yu.Ts. Oganessian et al., PRC 74.044602

  17. Evaporation residue cross sections for Ca48+U-Cf Exp. Yu.Ts. Oganessian et al., PRC 74.044602

  18. About element Z=120

  19. Evp. cross sections for nuclei Z=120 Dash dot: Ti+Cf249 Solid: Cr+Cm248 Dashed: Fe+Pu244 Fusion probability for nuclei Z=120

  20. Lifetime for some Cf isotopes

  21. Evp. Cross sections for some Ti+ Cf isotope reactions

  22. About element Z=119

  23. Evp. Cross sections for Cr+ Am and Fe+Np reactions leading to nuclei with Z=119

  24. Lifetime for some Bk isotopes

  25. Evp. Cross sections for some Ti+ Bk isotope reactions

  26. Summary • Some evaporation residue cross sections for 112-118 are studied with dyn-pes DNS model . The calculated results are in good agreements with experimental • Several combinations for Z=119, 120 are calculated . Some reactions are suggested.

  27. Thanks 谢谢

More Related