Nuclear Excitation by Electron Capture in Resonant Transfer Process

I will discuss research on Nuclear Excitation by Electron Capture in Resonant Transfer (NEEC-RT) that is the inverse process of nuclear internal conversion. After a short introduction on nuclear isomers, I will discuss the attempts to observe the NEEC process carried out over the last several decades. Then I will present the first experimental demonstration of NEEC resulting in depletion of the 93mMo isomer at 2425 keV, 21/2+, T1/2=6.85 h (Nature 554, 216, 2018). Finally, I will present attempts of more or less successful theoretical descriptions (including that presented in Phys. Rev. Lett. 127, 042501, 2021) and plans for further research.