This study aims to detect the neutrinos emission associated with the atomic transition, and conducts experiments to control the excitation/coherence formation of atoms into a metastable state and the de-excitation process from them.
Using Xe as the target atom, we conducted a multiphoton excitation experiment with a pulse laser to the first excited state (a metastable state with a lifetime of about 40 seconds). As a result, we succeeded in exciting to the metastable state through E1-M1 and E1-E2 two-photon excitation. In addition, the probe laser beam was introduced and the number of excitations could be calculated to be 1e+6 to 1e+7 per pulse, reaching a stage where it can be compared with the theoretical transition intensity.
The ability to compare the theory and experiment of two-photon transitions involving such forbidden transitions is an important advance for coherence control.