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,

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Presentation transcript:

1 Synthesis of superheavy elements with Z = 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

2 Contents  Introduction  Formalism  Results and discussions  Summary

3 Periodic Table for Chemistry Elements

4

5

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

7 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) 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) Feng et al., NPA 771 (2006) 50 Huang et al, PRC 84 (2011) Wang, Zhao, Scheid, Zhou 85,041601(R)(2012) Other model Wang et al 84, (R) (2011)

8 Evaporation residue cross section: 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 T P ENEN CN CN CF captur e fusion evaporati on

9 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

10 Formation of compound nucleus - Master equation Hamiltonian

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

12 Dynamical Potential Energy Surface(Dyn-Pes)

13 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

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

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

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

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

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

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

20 About element Z=120

21

22

23

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

25 Lifetime for some Cf isotopes

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

27

28 About element Z=119

29

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

31 Lifetime for some Bk isotopes

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

33 Summary  Some evaporation residue cross sections for 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.

34 Thanks 谢谢