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arXiv 2005.04981nucl-thnucl-ex
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Laser -核在突变区的相互作用

Laser-nucleus interactions in the sudden regime

Sergei Kobzak, Hans A. Weidenmüller, Adriana Pálffy

摘要:

从理论上研究了MeV量级的强脉冲激光与中等质量核的相互作用。光子的多重吸收与核平衡竞争。我们调查了突然的政权。在这里,光子吸收的速率是如此之强,以至于在每个光子吸收过程之后,原子核没有时间完全平衡。我们遵循的时间演化的系统中的一组速率方程。这些解释了偶极吸收和诱导偶极发射、平衡(根据剩余核相互作用耦合的粒子-空穴状态建模)和中子衰变(填充富含质子的核链)。我们的研究结果与早期的工作解决绝热制度的平衡是瞬时的。我们预测的程度的激发和范围的核达到中子蒸发。这些发现与规划未来的实验有关。

英文摘要:

The interaction between medium-weight nuclei and a strong zeptosecond laser pulse of MeV photons is investigated theoretically. Multiple absorption of photons competes with nuclear equilibration. We investigate the sudden regime. Here the rate of photon absorption is so strong that there is no time for the nucleus to fully equilibrate after each photon absorption process. We follow the temporal evolution of the system in terms of a set of rate equations. These account for dipole absorption and induced dipole emission, equilibration (modeled in terms of particle-hole states coupled by the residual nuclear interaction), and neutron decay (populating a chain of proton-rich nuclei). Our results are compared with earlier work addressing the adiabatic regime where equilibration is instantaneous. We predict the degree of excitation and the range of nuclei reached by neutron evaporation. These findings are relevant for planning future experiments.

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