Dependence of Heavy-Ion Fusion Reaction on Nuclear Deformation

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概要

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• In order to study the effect of nuclear deformation on complete fusion between spherical projectiles and well-deformed targets, we have measured the excitation functions at energies around the Coulomb barrier in the same compound nuclear system of ^<60>Ni+^<154>Sm and ^<32>S+^<182>W (the compound nucleus ^<214>Th), ^<76>Ge+^<150>Nd and ^<28>Si+^<198>Pt (the compound nucleus ^<226>U), and ^<64>Ni+^<154>Sm. To get the direct evidence that the heavy projectile really fuses with the deformed target, the fusion evaporation residues emitted to the beam direction were measured by using the JAERI recoil mass separator and identified on the basis of time- and position-correlated α-decays. The angular distribution of fission fragments was also measured to obtain the total fusion cross section. The measured cross sections of the fission and the evaporation residue were compared with the results of a coupled channel calculation and a statistical model calculation, respectively. In ^<32>S+^<182>W and ^<28>Si+^<198>Pt reactions having enough smaller charge product Z_1Z_2 than 1800, good agreements between the data and the calculated results were obtained. In the large Z_1Z_2 systems of ^<64, 60>Ni+^<154>Sm and ^<76>Ge+^<150>Nd, on the other hand, large fusion hindrance was observed up to about three orders of magnitude in the lowest energy region where only collisions around the tip of the deformed target are possible. The fusion hindrance gradually decreased in the high energy region where near side collisions become possible. By assuming of an extra-extra push energy around 20 MeV in the tip collisions and nearly zero in the side collision, the excitation function was reasonably reproduced. This is consistent with the theoretical speculation of hugging fusion or gentle fusion that the compact touching configuration of the side collision is more favorable for complete fusion than the elongated configuration of the tip collision.

• 理論物理学刊行会の論文
• 2004-07-30

著者

• NISHIO Katsuhisa

  Japan Atomic Energy Research Institute

• Lin Cheng-jian

  Japan Atomic Energy Research Institute:china Institute Of Atomic Energy

• IKEZOE H.

  Japan Atomic Energy Agency

• Ikezoe H

  Japan Atomic Energy Research Institute

• Ikezoe Hiroshi

  Japan Atomic Energy Agency

• MITSUOKA Shin-ichi

  Japan Atomic Energy Research Institute (JAERI)

• SATOU Kenichiro

  Japan Atomic Energy Research Institute (JAERI)

• TSURUTA Kaoru

  Japan Atomic Energy Research Institute (JAERI)

• Tsuruta Kaoru

  Japan Atomic Energy Research Institute

• Satou Kenichiro

  Japan Atomic Energy Research Institute:institute Of Physics And Tandem Accelerator Center University

• Ikezoe Hiroshi

  Japan Atomic Energy Research Institute

• Mitsuoka Shin-ichi

  Japan Atomic Energy Research Institute

• LIN Cheng-Jian

  Japan Atomic Energy Research Institute (JAERI)

• NISHIO Katsuhisa

  Japan Atomic Energy Research Institute (JAERI)

• IKEZOE Hiroshi

  Japan Atomic Energy Research Institute (JAERI)

• Nishio Katsuhisa

  Japan Atomic Energy Agency (JAEA), 2-4 Shirane, Tokai, Ibaraki 319-1195, Japan

• Mitsuoka Shin-ichi

  Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

• SATOU Kenichiro

  Japan Atomic Energy Research Institute:Institute of Physics and Tandem Accelerator Center, University of Tsukuba

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• Simultaneous Measurement of Prompt Neutrons and Fission Fragments for ^Pu(n_, f)
• Measurement of Evaporation Residue and Fission Cross Sections of the Reaction ^Si + ^U at Subbarrier Energies
• Orientation effects of deformed ^U target nuclei on the fusion probability for heavy element synthesis(International Workshop on Nuclear Structure-New Pictures in the Extended Isospin Space(NS07)-)
• The Present and the Future of JAERI Recoil Mass Separator
• Dependence of Heavy-ion Fusion Reaction on Nuclear Deformation and Nuclear Shell Structure
• Dependence of Heavy-Ion Fusion Reaction on Nuclear Deformation
• Effect of Closed Shell Structure on Heavy-Ion Fusion Reactions
• Effects of Nuclear Deformation on the Fusion Probability in the Reactions of ^Ge+^Nd and ^Se+^Ce
• Simulation Study on the Measurements of Diffusion Coefficients in Solid Materials by Short-lived Radiotracer Beams
• New Result in the Production and Decay of an Isotope, 278113, of the 113th Element
• Simulation Study on the Measurements of Diffusion Coefficients in Solid Materials by Short-lived Radiotracer Beams
• On-Line Diffusion Tracing in Li Ionic Conductors by the Short-Lived Radioactive Beam of 8Li

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