通过核共振荧光探测涡旋γ光子
Probing Vortex γ Photons via Nuclear Resonance Fluorescence
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中文总结 AI 辅助
该研究提出核共振荧光（NRF）可规避宏观靶标中涡旋γ光子标志性效应被抹去的问题，通过涡旋极角实现 MeV 涡旋γ束的定量诊断，并能在固定几何下提取核激发态角动量，为光核物理研究开辟新方向。
中文摘要 AI 辅助
高能涡旋γ光子凭借其独特的拓扑结构，在核物理、天体物理和强场物理领域具有独特的应用前景。然而，在迄今为止唯一实用的宏观靶标 regime 中，当通过光吸收的总跃迁概率进行探测时，它们的标志性效应会被抹去。本文表明，核共振荧光（NRF）可规避这一限制。采用贝塞尔模式描述，我们证明对于宏观靶标，散射光子的靶平均角分布仍保留对涡旋极角的明显依赖，这是唯一留存的涡旋特征。此外，通过扫描涡旋极角而非探测器角度，我们表明 NRF 可在固定几何设置下提取核激发态的角动量。涡旋极角作为 NRF 的新自由度，不仅为 MeV 能量尺度的涡旋γ束提供了直接定量诊断，还为探索光核物理中轨道角动量诱导的量子现象开辟了新途径。
英文摘要
High-energy vortex γ photons offer unique prospects in nuclear physics, astrophysics, and strong-field physics, owing to their distinctive topological structure. Yet, their hallmark effects are erased in macroscopic targets, the only practical regime to date, when probed via the total transition probability of photoabsorption. Here we show that nuclear resonance fluorescence (NRF) circumvents this limitation. Using a Bessel-mode description, we demonstrate that for macroscopic targets, the target-averaged angular distribution of scattered photons retains a distinct dependence on the vortex polar angle, which emerges as the sole surviving vortex signature. Moreover, by scanning the vortex polar angle instead of the detector angle, we show that NRF can extract the angular momentum of nuclear excited states in a fixed-geometry setup. The vortex polar angle, a new degree of freedom in NRF, not only provides a direct quantitative diagnostic for vortex γ beams at the MeV energy scale, but also opens a new avenue for exploring orbital angular momentum-induced quantum phenomena in photonuclear physics.
