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Coulomb corrections to bremsstrahlung in electric field of heavy atom at high energies

机译:高能重原子电场中的ms致辐射库仑校正

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摘要

The differential and partially integrated cross sections are considered for bremsstrahlung from high-energy electrons in atomic field with the exact account of this field. The consideration exploits the quasiclassical electron Green's function and wave functions in an external electric field. It is shown that the Coulomb corrections to the differential cross section are very susceptible to screening. Nevertheless, the Coulomb corrections to the cross section summed up over the final-electron states are independent of screening in the leading approximation over a small parameter $1/mr_{scr}$ ($r_{scr}$ is a screening radius, $m$ is the electron mass, $\hbar=c=1$). Bremsstrahlung from an electron beam of the finite size on heavy nucleus is considered as well. Again, the Coulomb corrections to the differential probability are very susceptible to the beam shape, while those to the probability integrated over momentum transfer are independent of it, apart from the trivial factor, which is the electron-beam density at zero impact parameter. For the Coulomb corrections to the bremsstrahlung spectrum, the next-to-leading terms with respect to the parameters $m/\epsilon$ ($\epsilon$ is the electron energy) and $1/mr_{scr}$ are obtained.
机译:考虑原子场中高能电子对致辐射的微分截面和部分积分截面,并精确地解释了该场。考虑因素是在外部电场中利用准经典电子格林函数和波函数。结果表明,对微分截面的库仑校正很容易被筛选。然而,在最终电子状态下对截面的库仑校正总和与在小参数$ 1 / mr_ {scr} $($ r_ {scr} $是屏蔽半径$ m)的前导近似中的屏蔽无关。 $是电子质量,$ \ hbar = c = 1 $)。还考虑了重核上有限大小的电子束发出的stra致辐射。再次,对微分概率的库仑校正非常容易受到电子束形状的影响,而对动量传递积分的概率的校正则与电子束形状无关,除了琐碎的因素(零冲击参数下的电子束密度)外。对于the致辐射光谱的库仑校正,获得了关于参数$ m / \ epsilon $($ \ epsilon $是电子能量)和$ 1 / mr_ {scr} $的次要条件。

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