重离子碰撞中产生$e^+e^-$对的窄峰的性质
The nature of the narrow peaks in the $e^+e^-$ pair production in heavy ion collisions
摘要：
GSI（Darmstadt，Germany）进行的重离子碰撞实验揭示了在1.5 ~ 2.0 MeV范围内产生的$e^+e^-$对的能量分布中的一系列窄的准等距峰，这归因于该对与快核与$Z\sim90$产生的强磁场的耦合。该对被捕获在具有$10^{-10}$ cm和平均场$\sim 5 \cdot 10^{12}$ Gs的尺寸的磁阱中，并且由于磁场“冻结”到导电介质中的阿尔芬效应，在$\sim 10^{-19}$ s期间又将该磁场限制在阱中。
英文摘要：
Experiments on heavy ion collisions performed at GSI (Darmstadt, Germany) revealed series of narrow quasi-equidistant peaks in the energy distribution of the produced $e^+e^-$ pairs in the range from 1.5 to 2.0 MeV which are ascribed to the pair coupling with a strong magnetic field generated by fast nuclei with $Z\sim90$. The pair is captured in the magnetic trap with dimensions of $10^{-10}$ cm and average field $\sim 5 \cdot 10^{12}$ Gs and, in turn, confines this magnetic field in the trap during $\sim 10^{-19}$ s due to the Alfven effect of magnetic field "freezing-in" into the conducting medium.
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