Abrasion-fission reactions at intermediate energies
Abrasion-fission reactions at intermediate energies
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DOI：
10.1103/physrevc.108.034604
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发表时间：
2023-09
影响因子：
3.1
通讯作者：
M. Bowry;O. Tarasov;J. Berryman;V. Bader;Dominique Bazin;T. Chupp;H. Crawford;A. Gade;E. Lunderberg;A. Ratkiewicz;F. Recchia;B. Sherrill;D. Smalley;A. Stolz;Steven Ragnar Stroberg;D. Weisshaar;S. Williams;K. Wimmer;J. Yurkon
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文献类型：
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作者：
M. Bowry;O. Tarasov;J. Berryman;V. Bader;Dominique Bazin;T. Chupp;H. Crawford;A. Gade;E. Lunderberg;A. Ratkiewicz;F. Recchia;B. Sherrill;D. Smalley;A. Stolz;Steven Ragnar Stroberg;D. Weisshaar;S. Williams;K. Wimmer;J. Yurkon
高强度的重离子束与灵敏的大固体角接收谱仪相结合的可用性使得能够对诱导裂变反应中产生的裂变碎片进行详细检查。在相对能量超过100 MeV/u的剧烈核碰撞中，磨损-裂变过程涉及形成类似弹丸的前碎片。在低于这一阈值的中间能量，实验表明在prefragment运动质量的变化。关于这个过渡阶段的影响后，接近分裂点的原子核的演变的信息是稀缺的。本文给出了80 MeV/u ~（238）U束流在磨蚀裂变反应中产生的从镍到钯的200多个核的数据。横截面获得以下的产量测量进行的主要电荷状态的识别裂变碎片和详细的分析的离子传输。使用LISE++软件包对裂变碎片进行了完整的运动学分析，其中通过光谱仪的离子的轨迹可以基于焦平面处的测量来重建。在S800摄谱仪获得的结果进行了比较与三裂变祖（3EER）模型获得的预测。裂变碎片属性的系统研究继续提供了一个有价值的实验基准的理论努力，旨在描述这一复杂的衰变通道，这是重要的背景下，规划实验，探索在稀有同位素束设施的核图表的中子丰富的区域。
The availability of high-intensity, heavy-ion beams coupled to sensitive, large solid-angleacceptance spectrometers has enabled a detailed examination of the fission fragments produced in induced-fission reactions. The abrasion-fission process involves the formation of projectile-like prefragments in violent nuclear collisions at relative energies in excess of 100 MeV/u. At intermediate energies below this threshold, experiments suggest a change in the prefragment kinematic qualities. Information regarding the influence of this transitional phase upon the evolution of nuclei approaching the point of scission is scarce. In this article, data are presented for over 200 nuclei from nickel to palladium produced in abrasion-fission reactions of a 80 MeV/u 238U beam. Cross sections were obtained following yield measurements performed for the principal charge states of the identified fission fragments and a detailed analysis of the ion transmission. A full kinematic analysis of the fission fragments has been performed using the LISE++ software package, where the trajectory of an ion passing through a spectrometer can be reconstructed based upon measurements at the focal plane. The results obtained at the S800 spectrograph are compared with predictions obtained with a three-fission progenitor (3EER) model. Systematic studies of fission-fragment properties continue to provide a valuable experimental benchmark for theoretical efforts directed toward describing this complex decay channel, that is important in the context of planning experiments to explore the neutron-rich region of the nuclear chart at rare-isotope beam facilities.