Origin of the dramatic change of fission mode in fermium isotopes investigated using Langevin equations

Miyamoto Y.; Aritomo Y.; Tanaka S.; Hirose K.; Nishio K.

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Origin of the dramatic change of fission mode in fermium isotopes investigated using Langevin equations

机译：使用Langevin方程研究了Fermium同位素中裂变模式剧烈变化的起源

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The fission of even-even fermium nuclides Fm250-260 at low excitation energy was studied using Langevin equations of three-dimensional nuclear-shape parametrization. The mass distributions of fission fragments show a dramatic change from an asymmetric shape for the lighter fermium isotopes to sharp symmetric fission for the heavier isotopes. The time evolution of the nuclear shape on the potential surface reveals that the lighter fermium isotopes showing asymmetric fission are trapped in the second minimum for a substantial length of time before overcoming the second saddle point. This behavior changes dramatically for the compact symmetric fission found in the heavier neutron-rich fermium nuclei that disintegrate immediately after overcoming the first saddle point, without feeling the second barrier, resulting in a fission time two orders of magnitude shorter.

机译：研究了使用立体核形状参数化的Langevin方程，研究了低激发能量下的偶叶均核素FM250-260的裂变。裂变片段的质量分布显示出从较轻的Fermium同位素的不对称形状对较重同位素对称裂变的剧烈变化。核形状对电位表面的时间演变表明，在克服第二鞍点之前，显示出显示不对称裂变的较轻的费米同位素被捕获在第二个最小值中。这种行为在较重的中子细胞核中发现的紧凑型对称裂变，在克服第一个鞍点之后立即崩溃，而不会感觉到第二个屏障，导致裂变时间两个数量级短。

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《Physical review, C》 |2019年第5期|共7页
作者
Miyamoto Y.; Aritomo Y.; Tanaka S.; Hirose K.; Nishio K.;
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作者单位

Kindai Univ Fac Sci &

Engn Higashiosaka Osaka Japan;

Kindai Univ Fac Sci &

Engn Higashiosaka Osaka Japan;

Kindai Univ Fac Sci &

Engn Higashiosaka Osaka Japan;

Japan Atom Energy Agcy Adv Sci Res Ctr Tokai Ibaraki Japan;

Japan Atom Energy Agcy Adv Sci Res Ctr Tokai Ibaraki Japan;

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正文语种 eng
中图分类原子核物理学、高能物理学;
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1. Origin of the dramatic change of fission mode in fermium isotopes investigated using Langevin equations [J] . Miyamoto Y., Aritomo Y., Tanaka S., Physical review, C . 2019,第5期

机译：使用Langevin方程研究了Fermium同位素中裂变模式剧烈变化的起源
2. Induced fission modes of Fermium and Nobelium isotopes [J] . H. Pa?ca, A.V. Andreev, G.G. Adamian, Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions . 2018,第期

机译：Fermium和Nobelium同位素的诱发裂变模式
3. Dynamical simulation of neutron-induced fission of uranium isotopes using four-dimensional Langevin equations [J] . Pahlavani M. R., Mirfathi S. M. Physical review, C . 2016,第4期

机译：使用四维Langevin方程，铀同位素的中子诱导裂变的动态模拟
4. Fission Modes and Mass Distribution in Heavy Actinide Region Studied with Multi-Dimensional Langevin Equation [C] . Takatoshi ICHIKAWA, Tomomasa ASANO, Takahiro WADA, Symposium on nuclear data . 2004

机译：用多维Langevin方程研究重型散幂区域中的裂变模式和质量分布
5. Effect of stress concentrators on a stochastic model of crack paths in composites based on the Langevin equation. [D] . Mackay, Alex J. 2011

机译：应力集中器对基于Langevin方程的复合材料裂纹路径随机模型的影响。
6. Correlated transitions in TKE and mass distributions of fission fragments described by 4-D Langevin equation [O] . Mark Dennis Usang, Fedir A. Ivanyuk, Chikako Ishizuka, -1

机译：用4-D Langevin方程描述的TKE的相关跃迁和裂变碎片的质量分布
7. Fission modes in fermium isotopes with Brownian shape-motion model [O] . Martin Albertsson, B. Gillis Carlsson, Thomas Døssing, 2019

机译：褐色形状运动模型Fermium同位素的裂变模式
8. Low-Energy Fission Systematics of the Fermium Isotopes: The Transition from Mass Asymmetry at Fermium-254 to Symmetry at Fermium-259 [R] . Hoffman, D. C. 1976

机译：钬同位素的低能裂变系统学：从镉-254的质量不对称到钍-259的对称性的转变

Origin of the dramatic change of fission mode in fermium isotopes investigated using Langevin equations

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