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同位旋对用裂变截面探测鞍点前摩擦的影响

田舰 叶巍

田舰, 叶巍. 同位旋对用裂变截面探测鞍点前摩擦的影响[J]. 原子核物理评论, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529
引用本文: 田舰, 叶巍. 同位旋对用裂变截面探测鞍点前摩擦的影响[J]. 原子核物理评论, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529
TIAN Jian, YE Wei. Influence of Isospin on Fission Cross Section as a Probe of Presaddle Nuclear Dissipation[J]. Nuclear Physics Review, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529
Citation: TIAN Jian, YE Wei. Influence of Isospin on Fission Cross Section as a Probe of Presaddle Nuclear Dissipation[J]. Nuclear Physics Review, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529

同位旋对用裂变截面探测鞍点前摩擦的影响

doi: 10.11804/NuclPhysRev.34.03.529
基金项目: 国家自然科学基金资助项目(11575044)
详细信息
    作者简介:

    田舰(1990-),男,重庆人,研究生,从事原子核物理研究;E-mail:tian-jian@seu.edu.cn

    通讯作者: 叶巍,E-mail:yewei@seu.edu.cn
  • 中图分类号: O571.6

Influence of Isospin on Fission Cross Section as a Probe of Presaddle Nuclear Dissipation

Funds: National Natural Science Foundation of China (11575044)
More Information
    Corresponding author: 10.11804/NuclPhysRev.34.03.529
  • 摘要: 耦合了轻粒子发射的随机Langevin模型被用于计算三个Bi裂变系统因核耗散效应引起的相对于标准统计模型预计的裂变截面值的变化,σfdrop作为激发能的函数。发现209Bi的σfdrop要大于202Bi和195Bi的σfdrop,这表明高同位旋系统209Bi的裂变截面对摩擦强度有更大的敏感性。该结果建议,当实验上使用裂变激发函数来更精确地提取鞍点前摩擦强度时,应产生具有高同位旋的复合核。进而,通过Langevin计算拟合p+206Pb和p+209Bi反应的裂变激发函数数据,提取的鞍点前摩擦强度为(3~5)×1021 s-1


    Langevin models that are coupled with particle emission are applied to calculate the drop of fission cross section caused by friction over its standard statistical-model value, σfdrop, as a function of excitation energy for three Bi nuclei with different isospins. We find that σfdrop become larger for 209Bi than for 202Bi and 195Bi, indicating a greater sensitivity of fission cross section to friction for high-isospin 209Bi. These results suggest that, to more accurately determine the presaddle dissipation strength by measuring fission excitation functions, it is best to populate those compound systems with a high isospin. Furthermore, we analyze the data of fission excitation functions measured in p + 209Bi and p + 208Pb reactions, which yield high-isospin 210Po and 209Bi systems, and extract a presaddle friction strength of (3-5)×1021 s-1 by comparing Langevin simulations with these experimental data.
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出版历程
  • 收稿日期:  2016-12-07
  • 修回日期:  2017-03-30
  • 刊出日期:  2017-07-18

同位旋对用裂变截面探测鞍点前摩擦的影响

doi: 10.11804/NuclPhysRev.34.03.529
    基金项目:  国家自然科学基金资助项目(11575044)
    作者简介:

    田舰(1990-),男,重庆人,研究生,从事原子核物理研究;E-mail:tian-jian@seu.edu.cn

    通讯作者: 叶巍,E-mail:yewei@seu.edu.cn
  • 中图分类号: O571.6

摘要: 耦合了轻粒子发射的随机Langevin模型被用于计算三个Bi裂变系统因核耗散效应引起的相对于标准统计模型预计的裂变截面值的变化,σfdrop作为激发能的函数。发现209Bi的σfdrop要大于202Bi和195Bi的σfdrop,这表明高同位旋系统209Bi的裂变截面对摩擦强度有更大的敏感性。该结果建议,当实验上使用裂变激发函数来更精确地提取鞍点前摩擦强度时,应产生具有高同位旋的复合核。进而,通过Langevin计算拟合p+206Pb和p+209Bi反应的裂变激发函数数据,提取的鞍点前摩擦强度为(3~5)×1021 s-1


Langevin models that are coupled with particle emission are applied to calculate the drop of fission cross section caused by friction over its standard statistical-model value, σfdrop, as a function of excitation energy for three Bi nuclei with different isospins. We find that σfdrop become larger for 209Bi than for 202Bi and 195Bi, indicating a greater sensitivity of fission cross section to friction for high-isospin 209Bi. These results suggest that, to more accurately determine the presaddle dissipation strength by measuring fission excitation functions, it is best to populate those compound systems with a high isospin. Furthermore, we analyze the data of fission excitation functions measured in p + 209Bi and p + 208Pb reactions, which yield high-isospin 210Po and 209Bi systems, and extract a presaddle friction strength of (3-5)×1021 s-1 by comparing Langevin simulations with these experimental data.

English Abstract

田舰, 叶巍. 同位旋对用裂变截面探测鞍点前摩擦的影响[J]. 原子核物理评论, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529
引用本文: 田舰, 叶巍. 同位旋对用裂变截面探测鞍点前摩擦的影响[J]. 原子核物理评论, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529
TIAN Jian, YE Wei. Influence of Isospin on Fission Cross Section as a Probe of Presaddle Nuclear Dissipation[J]. Nuclear Physics Review, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529
Citation: TIAN Jian, YE Wei. Influence of Isospin on Fission Cross Section as a Probe of Presaddle Nuclear Dissipation[J]. Nuclear Physics Review, 2017, 34(3): 529-533. doi: 10.11804/NuclPhysRev.34.03.529
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