论文标题
探索激光驱动的中子源用于中子捕获级联反应和产生富含中子的同位素
Exploring laser-driven neutron sources for neutron capture cascades and the production of neutron-rich isotopes
论文作者
论文摘要
理论上研究了富含中子的同位素和通过激光驱动（脉冲）中子源的中子捕获级联反应的产生。考虑的方案涉及激光驱动的中子束与由单一类型的种子核素制成的靶标的相互作用。我们提出了一项超过$ 95 $的种子核心的全面研究，$ 3 \ le z \ le 100 $从$^7_3 $ li到$^{255} _ {100} $ fm。对于每个元素，最重的寿命（半寿命$> 1 $ h）同位素的同位素可在最近的ENDF-B-VIII.0中子sublibrary中获得。我们鉴定出有趣的种子核素，在可能发生中子捕获级联反应的中子同位素的产生中具有良好的性能。还分析了每个脉冲中子数，中子靶标相互作用的大小和中子脉冲数的影响。我们的结果表明，与原始种子Nuclide相比，在中子富含$ 4 $的同位素的可能性高达$ 4 $的中子捕获事件的可能性。这暗示了产生富含中子的同位素并模拟中子捕获实验室中的中子核合成的新实验可能性。在$ s $ -process（$^{126} _ {51} $ sb，$^{176} _ {71} $ lu and $^{187} _ {187} _ {75} $ re）或$ r $ -prucess（ru y ru re a re）中，有几个有趣的种子核素在$ s $ - process的分支区域（$^{126} _ {51} _ {51} $激光驱动的实验可以阐明我们对核合成的理解。
The production of neutron-rich isotopes and the occurrence of neutron capture cascades via laser-driven (pulsed) neutron sources are investigated theoretically. The considered scenario involves the interaction of a laser-driven neutron beam with a target made of a single type of seed nuclide. We present a comprehensive study over $95$ seed nuclides in the range $3\le Z \le 100$ from $^7_3$Li to $^{255}_{100}$Fm. For each element, the heaviest sufficiently-long-lived (half life $> 1$ h) isotope whose data is available in the recent ENDF-B-VIII.0 neutron sublibrary is considered. We identify interesting seed nuclides with good performance in the production of neutron-rich isotopes where neutron capture cascades may occur. The effects of the neutron number per pulse, the neutron-target interaction size and the number of neutron pulses are also analyzed. Our results show the possibility of observing up to $4$ successive neutron capture events leading to neutron-rich isotopes with $4$ more neutrons than the original seed nuclide. This hints at new experimental possibilities to produce neutron-rich isotopes and simulate neutron capture nucleosynthesis in the laboratory. With several selected interesting seed nuclides in the region of the branching point of the $s$-process ($^{126}_{51}$Sb, $^{176}_{71}$Lu and $^{187}_{75}$Re) or the waiting point of the $r$-process (Lu, Re, Os, Tm, Ir and Au), we expect that laser-driven experiments can shed light on our understanding of nucleosynthesis.
