Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 67(6): 255-265 (2018)

連載講座Serial Lecture

超重元素合成の理論揺動散逸理論の観点からNuclear Theory for The Synthesis of Superheavy ElementsFrom The View Point of Fluctuation-dissipation Theory

関西大学システム理工学部物理・応用物理学科Department of Pure and Applied Physics, Faculty of Engineering Science, Kansai University ◇ 564–8680 大阪府吹田市山手町3–3–35 ◇ 3–3–35 Yamatecho, Suita, Osaka 564–8680, Japan

発行日:2018年6月15日Published: June 15, 2018


The element with Z=113 has been named as Nihonium and the names of the new elements up to Z=118 have been determined. Synthesis of these superheavy elements is a fusion–fission process under a very strong Coulomb repulsion. It revealed many new aspects of nuclear reactions such as quasi-fission which were not carefully studied so far. In this manuscript, we describe the processes of the synthesis of supreheavy elements from the view point of fluctuation-dissipation theory. We apply Langevin equation to calculate the competition between the formation of superheavy compound nuclei and the decay through the quasi-fission reaction. We also discuss the importance of the shell-correction energy in the survival process.

Key words: superheavy element; fusion–fission reaction; fluctuation-dissipation theory; Langevin equation; shell correction energy

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