论文标题
关于野外辅助双重delbrück散射的可观察性
On the observability of field-assisted birefringent Delbrück scattering
论文作者
论文摘要
我们考虑X射线自由电子激光（XFEL）光束的散射在强磁场$ \ bf {b} _ {\ rm ext} $的叠加中，并使用库仑字段$ \ bf {e} _ {\ bf {e} _ {\ rm ext} $带收费号码的核的nume number number number number $ z $ z $。与Puredelbrück散射（仅库仑场）相反，磁场$ \ bf {b} _ {\ rm ext} $引入了一个不对称的（即极化依赖性），并使有效的交互作用使有效的交互作用量很大，而核库仑（Noubom Coulomb）则促进了大量动量动量转移$Δ$Δ;对于$ b _ {\ rm ext} = 10^6〜 \ rm t $的场强（对应于订单的强度$ 10^{22}}}〜\ rm w/cm^2 $）和24 kev的xfel频率，我们找到了一个不同的交叉部分$ dtσ/dσ/dtσ/d p = sim10^$ 25}^z^z^2/（一个核。因此，在不久的将来，在欧洲XFEL的Helmholtz国际极端田地（Hibef）等设施中，这种效果可能是可以观察到的。
We consider the scattering of an x-ray free-electron laser (XFEL) beam on the superposition of a strong magnetic field $\bf{B}_{\rm ext}$ with the Coulomb field $\bf{E}_{\rm ext}$ of a nucleus with charge number $Z$. In contrast to pure Delbrück scattering (Coulomb field only), the magnetic field $\bf{B}_{\rm ext}$ introduces an asymmetry (i.e., polarization dependence) and renders the effective interaction volume quite large, while the nuclear Coulomb field facilitates a significant momentum transfer $Δ\bf k$. For a field strength of $B_{\rm ext}=10^6~\rm T$ (corresponding to an intensity of order $10^{22}~\rm W/cm^2$) and an XFEL frequency of 24 keV, we find a differential cross section $dσ/dΩ\sim10^{-25}~Z^2/(Δ{\bf k})^2$ in forward direction for one nucleus. Thus, this effect might be observable in the near future at facilities such as the Helmholtz International Beamline for Extreme Fields (HIBEF) at the European XFEL.
