论文标题

在低相对论能量的电子电子散射中可能违反自旋统计连接

Possible violation of spin-statistics connection in electron-electron scattering at low relativistic energies

论文作者

Sen, R. N.

论文摘要

1954年,阿什金(Ashkin),佩奇(Page)和伍德沃德(Woodward)(以下简称APW)在第一个计数器实验上报告了在低相对论能量(0.6-1.7 MEV)处的电子电子和电子峰散射横截面。他们的目的是寻找Moller和Bhabha公式所预测的旋转和交换或虚拟歼灭效应。他们的实验证实了这些效果,但是在0.61 MeV处测得的横截面明显小于其预测值。作者指出,这些偏差是“大概是由于多个散射造成的”。但是,仔细阅读了《未发表的论文》(1950年)和阿什金(1952),佩奇的信(1951)和APW纸,没有发现在0.61 MEV的多个散射的可靠证据;如果有的话,证据可以反对多次散射。如果排除了多个散射,则观察结果可能表明与量子电动力学有所不同。这种离开可能是由于非库仑中心力,自旋统计连接的弱化或两者兼而有之。只有实验才能分辨出这些可能性中的哪个是正确的,因此我们建议以不同的能量(0.4-1.0 MEV)和不同的散射角度进行新的电子电子散射实验,以及多个散射的特定测试。我们认为非库仑中央力是不太可能的,并推进了一个假说,即电子对的一部分是旋转零费米子(这将降低观察到的横截面)。数值计算表明,该假设可以在页面类型实验中进行定量检验,即使他在1950年获得的准确性几乎没有提高。

In 1954, Ashkin, Page and Woodward (hereafter APW) reported on the first counter experiments to measure the electron-electron and electron-positron scattering cross-sections at low relativistic energies (0.6-1.7 MeV). Their aim was to look for the spin and exchange or virtual annihilation effects predicted by the Moller and Bhabha formulae. Their experiments confirmed these effects, but the measured cross-sections at 0.61 MeV were significantly smaller than their predicted values. The authors remarked that these deviations were `presumably due to multiple scattering'. However, careful reading of the unpublished theses of Page (1950) and Ashkin (1952), Page's letter (1951) and the APW paper reveals no credible evidence of multiple scattering at 0.61 MeV; if anything, the evidence rules against multiple scattering. If multiple scattering is ruled out, the observations may indicate a departure from quantum electrodynamics. This departure may be due to a non-Coulomb central force, a weakening of the spin-statistics connection, or both. Only experiment can tell which of these possibilities holds true, and therefore we suggest the new electron-electron scattering experiments be carried out at different energies (at 0.4-1.0 MeV) and different scattering angles, as well as specific tests for multiple scattering. We consider a non-Coulomb central force to be very unlikely, and advance the hypothesis that a fraction of the electron pairs scatter as spin-zero fermions (which would lower the observed cross-section). Numerical calculations show that the hypothesis may be tested quantitatively in a Page-type experiment, even with little improvement in the accuracy he achieved in 1950.

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