Zepto-Second Atomic Clock for Nuclear Contact Time Measurements

摘要: Renewed interest in search for the spontaneous decay of neutral vacuum by emission positrons overcritical nuclear collision systems prompted question how to find experimental triggers required long sticking times order \(10^{-20}\) s dissipative heavy ion collisions [1]. A survey various conceivable methods led conclusion that most promising way may be either directly positron line [2] or investigate shape \(\delta \)-electron spectra [3, 4], both as function total kinetic energy loss a large mass transfer between partners. The \)-electron-spectroscopy tool has been employed previous experiment U \(+\) Au system at an uranium beam 8.65 MeV/u [5] which contact only 1 zs = \(1\times 10^{-21}\) were deduced.