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arXiv 1708.04826physics.plasm-phnucl-th
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通过电子捕获调整laser产生的等离子体用于有效的核激发

Tailoring laser-generated plasmas for efficient nuclear excitation by electron capture

Yuanbin Wu, Jonas Gunst, Christoph H. Keitel, Adriana Pálffy

摘要:

从理论上研究了超强光激光与固体物质相互作用产生的等离子体环境中电子俘获激发核的最佳参数。作为一个案例研究,我们认为4.85千电子伏的核跃迁开始从长寿命的$^{93\mathrm{m}}$钼异构体,可以导致释放存储的2.4兆电子伏的激发能。我们发现,由于复杂的等离子体动力学,核激发速率和实际的激发核数并没有达到他们的最大值在相同的激光参数。高功率光学激光器实现的核激发是高达12和高达6个数量级大于直接共振和二次等离子体介导的激发在X射线自由电子激光,分别预测的值。我们的研究结果表明,实验观察核激发的$^{93\mathrm{m}}$钼和随后释放的存储能量应该是可能的,在现有的激光设施。

英文摘要:

The optimal parameters for nuclear excitation by electron capture in plasma environments generated by the interaction of ultra-strong optical lasers with solid matter are investigated theoretically. As a case study we consider a 4.85 keV nuclear transition starting from the long-lived $^{93\mathrm{m}}$Mo isomer that can lead to the release of the stored 2.4 MeV excitation energy. We find that due to the complex plasma dynamics, the nuclear excitation rate and the actual number of excited nuclei do not reach their maximum at the same laser parameters. The nuclear excitation achievable with a high-power optical laser is up to twelve and up to six orders of magnitude larger than the values predicted for direct resonant and secondary plasma-mediated excitation at the x-ray free electron laser, respectively. Our results show that the experimental observation of the nuclear excitation of $^{93\mathrm{m}}$Mo and the subsequent release of stored energy should be possible at laser facilities available today.

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