Origin of the Dramatic Change of Fission Mode in Fermium Isotope Investigated Using Langevin Equations

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Other Title
  • フェルミウム原子核で起きるユニークな核分裂――動力学模型の視点から
  • フェルミウム ゲンシカク デ オキル ユニーク ナ カクブンレツ : ドウリキガク モケイ ノ シテン カラ

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Abstract

<p>Nuclear fission is a unique process characteristics to heavy-mass nuclear systems. About 40 years ago, it was observed in the spontaneous fission of fermium (element 100) that fission-fragment mass distribution dramatically changes from the mass-asymmetric distribution in 257Fm to the sharp mass-symmetric shape in 258Fm. In the present work, we investigated the mechanism of this phenomenon using a dynamical model (Langevin calculation). In such a heavy system, a new fission saddle point leading to the sharp symmetric fission emerges and competes with the traditional saddle point connecting to the asymmetric fission. It was found that the unique vibrational motion, which originates from the non-diagonal elements of transport coefficients in the Langevin equation, has the important role in the selection of two types of fission.</p>

Journal

  • Butsuri

    Butsuri 75 (10), 631-636, 2020-10-05

    The Physical Society of Japan

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