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論文

Estimation of synthesizing new superheavy elements using dynamical model

有友 嘉浩*; 天野 翔太*; 奥林 瑞貴*; 栁 漠*; 西尾 勝久; 太田 雅久*

Physics of Atomic Nuclei, 83(4), p.545 - 549, 2020/07

 被引用回数:0 パーセンタイル:0.00(Physics, Nuclear)

For the success of synthesis of the superheavy elements Z $$>$$ 118, it is indispensable to clarify the fusion-fission mechanism, which includes a role of the nuclear structure of colliding nuclei and the deformation in the fusion process. We develop the dynamical model to estimate the probability to produce new superheavy nuclei. To approach Island of Stability and synthesize new elements, we propose a new idea, which takes advantage of the shell structure in fusion and fission process.

口頭

Cassiniパラメータを用いた6次元Langevin方程式による核分裂ダイナミクス

岡田 和記; 西尾 勝久; 和田 隆宏*; Carjan, N.*

no journal, , 

日本原子力学会のシグマ調査専門委員会は、将来のJENDL核データ評価の取り組みとして、「核分裂ジェネレータ」を取り入れる評価方法を提言しており、原子核物理の基礎理論から構築された核分裂シミュレーションの実現が期待されている。本発表では6次元Cassini parameterを用いたLangevin方程式による核分裂計算の結果や今後の展望について報告する。

口頭

Study of fission dynamics using six-dimensional Langevin equation

岡田 和記; 西尾 勝久

no journal, , 

超重元素合成のために、核分裂をはじめとした核反応に関する実験、理論をさらに発展させていく必要がある。本講演では、現在原子力機構で行われている6次元Langevin方程式を用いた核分裂シミュレーションの現状と今後の計画について報告する。

口頭

Dynamical approach to fission using six-dimensional Cassini shape parameterization

岡田 和記; 西尾 勝久

no journal, , 

The dynamical approach to fission using the multi-dimensional Langevin equation plays an essential role in understanding the fission mechanism. This approach provides a description of the fission process from the ground state to scission by solving the time evolution of shape parameters. The key challenge is that the results largely depend on the choice of shape parameterization, especially when the number of parameters is small. The four- and five-dimensional two-center shell model has been applied as a practical model for representing typical fragment shapes. In our study, to account for various fission modes, we employ the Cassini shape parameterization, which can flexibly describe a wide range of deformed shapes through combinations of shape parameters. To reduce the dependence of the results on the parameterization, it is crucial to perform calculations in high-dimensional Cassini shape coordinates. In this seminar, we will discuss the current results and future plan of our study with the six-dimensional Cassini shape parameterization, computed with the supercomputer at JAEA.

口頭

Study of fission modes in $$^{258}$$Md with six-dimensional Langevin equation

岡田 和記; 西尾 勝久; 和田 隆宏*; Carjan, N.*

no journal, , 

We calculate the fission process of $$^{258}$$Md with the multi-dimensional Langevin equation with the Cassini shape parameterization. To describe various fission modes, we use the six Cassini shape parameters $${alpha,,alpha_1,,alpha_2,,alpha_3,,alpha_4,,alpha_5}$$, and apply them to the six-dimensional Langevin equation. The combination of these shape parameters can flexibly describe deformed nuclear shapes. This is the first attempt to calculate the Langevin dynamics in the six-dimensional collective coordinates. The resulting fragment mass and TKE distributions show the existence of three types of fission modes, consistent with the measurement data from JAEA. Furthermore, by increasing the excitation energy from 15 MeV to 18 MeV, the relative contribution of each mode is changed. With higher excitation energy, the short symmetric fission mode decreases significantly, and the asymmetric fission mode becomes dominant. It is considered that the shell effect corresponding to short symmetric fission is largely damped by the increase in excitation energy. Through analysis of fission paths obtained from these six-dimensional Langevin calculations, we expect to elucidate the physical origins and mechanisms of each fission mode.

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