论文标题
通过颤抖电子的库仑碰撞核异构体的飞秒泵
Femtosecond pumping of nuclear isomeric states by the Coulomb collision of ions with quivering electrons
论文作者
论文摘要
核异构体的有效产生对于核钟，核电池，清洁核能和核γ射线激光器等开创性应用至关重要。但是，由于较小的生产横截面和快速衰减，由于低光束强度，通过传统的加速器或反应堆获得大量具有寿命短的异构体是极其困难的。在这里，我们首次通过用激光场引起的颤动电子对离子的库仑激发对核异构体态的飞秒泵送。从桌面一百吨激光系统中产生了以83kR激发态的核核，其峰值效率为2.34*10^15粒子。可以通过在激光脉冲和簇之间的相互作用中以几乎固体密度之间的相互作用在相互作用的过程中对离子的库仑激发来解释。这种有效而通用的生产方法可广泛用于泵送具有激发态寿命的同位素，以降至皮秒，这可能是诸如核过渡机制和核γ射线激光器等领域的好处。
Efficient production of nuclear isomers is critical for pioneering applications, like nuclear clocks, nuclear batteries, clean nuclear energy, and nuclear γ-ray lasers. However, due to small production cross sections and quick decays, it is extremely difficult to acquire a significant amount of isomers with short lifetimes via traditional accelerators or reactors because of low beam intensity. Here, for the first time, we experimentally present femtosecond pumping of nuclear isomeric states by the Coulomb excitation of ions with the quivering electrons induced by laser fields. Nuclei populated on the third excited state of 83Kr are generated with a peak efficiency of 2.34*10^15 particles=s from a tabletop hundred-TW laser system. It can be explained by the Coulomb excitation of ions with the quivering electrons during the interaction between laser pulses and clusters at nearly solid densities. This efficient and universal production method can be widely used for pumping isotopes with excited state lifetimes down to picoseconds, and could be a benefit for fields like nuclear transition mechanisms and nuclear γ-ray lasers.
