The text discusses the successful application of the Time-Dependent Hartree-Fock (TDHF) theory to the 209Pb + 208Pb reaction, demonstrating its viability as a microscopic tool for describing heavy-ion collision phenomena. The theory, which does not contain any free parameters, quantitatively reproduces essential features observed in the reaction. The study acknowledges the contributions of various researchers and the financial support from the Danish Research Council and the Commemorative Association of the Japan World Exposition. The text also includes references to previous works on TDHF and related topics. In another section, the authors describe their measurement of the electron energy spectrum produced by multiphoton ionization of xenon atoms using a retarding potential technique. They observe discrete absorption of photons above the six-photon ionization threshold under specific conditions. A simple model based on inverse bremsstrahlung agrees well with the experimental results. The experiment uses a Nd³⁺-glass laser and measures the electron energy spectrum at intensities of about \(10^{13} \, \text{W cm}^{-2}\). The results show a peak at an energy close to the six-photon ionization threshold, confirming the detection of the seven-photon process including one free-free transition. The final part of the text reports on the measurement of differential cross sections for the elastic scattering of positrons by argon atoms using a time-of-flight technique. The apparatus and experimental setup are described, along with the sources of experimental error and comparisons with theoretical calculations. The measurements cover positron energies of 2.2, 3.4, 6.7, and 8.7 eV, and angles between 20° and 60°.The text discusses the successful application of the Time-Dependent Hartree-Fock (TDHF) theory to the 209Pb + 208Pb reaction, demonstrating its viability as a microscopic tool for describing heavy-ion collision phenomena. The theory, which does not contain any free parameters, quantitatively reproduces essential features observed in the reaction. The study acknowledges the contributions of various researchers and the financial support from the Danish Research Council and the Commemorative Association of the Japan World Exposition. The text also includes references to previous works on TDHF and related topics. In another section, the authors describe their measurement of the electron energy spectrum produced by multiphoton ionization of xenon atoms using a retarding potential technique. They observe discrete absorption of photons above the six-photon ionization threshold under specific conditions. A simple model based on inverse bremsstrahlung agrees well with the experimental results. The experiment uses a Nd³⁺-glass laser and measures the electron energy spectrum at intensities of about \(10^{13} \, \text{W cm}^{-2}\). The results show a peak at an energy close to the six-photon ionization threshold, confirming the detection of the seven-photon process including one free-free transition. The final part of the text reports on the measurement of differential cross sections for the elastic scattering of positrons by argon atoms using a time-of-flight technique. The apparatus and experimental setup are described, along with the sources of experimental error and comparisons with theoretical calculations. The measurements cover positron energies of 2.2, 3.4, 6.7, and 8.7 eV, and angles between 20° and 60°.