| Project/Area Number |
17540278
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
MITSUOKA Shinichi Japan Atomic Energy Agency, Advanced Science Research Center, Scientist (40354881)
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| Co-Investigator(Kenkyū-buntansha) |
IKEZOE Hiroshi Japan Atomic Energy Agency, Advanced Science Research Center, Scientist (90355058)
NISHIO Katsuhisa Japan Atomic Energy Agency, Advanced Science Research Center, Scientist (70343928)
JEONG Sun-Chan Japan Atomic Energy Agency, High Energy Accelerator Research Organization, Associate Professor (00262105)
WATANABE Yutaka Japan Atomic Energy Agency, High Energy Accelerator Research Organization, Associate Professor (50353363)
HAGINO Koichi Tohoku University, 大学院・理学研究科物理学専攻, Associate Professor (20335293)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2006: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Experimental Nuclear Physics / Theoretical Nuclear Physics / Heavy-ion Accelerator / Radiation / Super-heavy element / Heavy-ion Fusion Reaction / Quasi-elastic Backscattering / Fusion Barrier Distribution / 加速器 / 放射線、X線、粒子線 |
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| Research Abstract |
Coulomb barrier distribution in heavy-ion reaction gives us important information about the interaction potential for nucleus-nucleus collisions. Especially, the barrier height is a key quantity for choosing the bombarding energy in fusion reactions leading to the synthesis of super-heavy elements. Up to now, several nucleus-nucleus potentials have been proposed and different barrier heights are predicted. Therefore, it is necessary to experimentally obtain the barrier distributions in such massive systems.
In order to extract the barrier distribution in Pb/Bi-based cold fusion, we have measured excitation functions for quasi-elastic scattering of ^<48>Ti, ^<54>Cr, ^<56>Fe, ^<64>Ni, and ^<70>Zn projectiles on ^<208>Pb target at backward angles. The experiments were carried out at the tandem-booster facility of Japan Atomic Energy Agency (JAEA). The barrier distributions were derived from the first derivative of measured quasi-elastic scattering cross sections relative to the Rutherford scattering cross section. It was found that the centroids of the barrier distributions show a deviation from several predicted barrier heights toward the low energy side. The shape of the barrier distributions is well reproduced by the results of a coupled-channel calculation taking account of the coupling effects of two phonon excitations of the quadrupole vibration for the projectiles and of the octupole vibration for the targets.
The research results were announced in international conferences on reaction mechanism and nuclear structure at the Coulomb barrier (Fusion06) and Joint meeting of nuclear physics divisions of Japan and American Physics Societies (HAW05), and have recently published in Physical Review Letter.
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