$^{135m}$ Cs玻色-爱因斯坦凝聚体中相干γ光子的产生
Coherent gamma photon generation in a Bose-Einstein condensate of $^{135m}$Cs
摘要：
我们已经确定了集体核去激发的机制，在玻色-爱因斯坦凝聚体的$^{135}$ Cs原子在其异构态，$^{135m}$ Cs，适合于产生相干γ光子。这里描述的过程不对应于单程放大，单程放大由于吸收线和发射线之间的大位移而不能在原子系统中发生，也不需要与标准Dicke超辐射相关的大密度。因此，它克服了在许多系统中阻碍相干伽马射线产生的限制。因此，我们提出了一种产生相干伽马射线的方法，该方法依赖于核物理和原子物理学的成熟技术的组合，并且可以用当前可用的技术来实现。
英文摘要：
We have identified a mechanism of collective nuclear de-excitation in a Bose-Einstein condensate of $^{135}$Cs atoms in their isomeric states, $^{135m}$Cs, suitable for the generation of coherent gamma photons. The process described here does not correspond to single-pass amplification, which cannot occur in atomic systems due to the large shift between absorption and emission lines, nor does it require the large densities associated to standard Dicke super-radiance. It thus overcome the limitations that have been hindering the generation of coherent gamma rays in many systems. Therefore, we propose an approach for generation of coherent gamma rays, which relies on a combination of well established techniques of nuclear and atomic physics, and can be realized with currently available technology.
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