Temporal variation of fundamental constants in 229Th transition

摘要

If is there enhanced sensitivity to variations of fine structure constant,nucleon mass and meson masses in the transition between the low energy and long-lived nuclear isomer and ground states? To answer this open problem,we investigate the transition between the long-lived 7.64±0.5 eV isomer and ground states in 229Th based on the formulae derived from both the Nilsson model and Feynman-Hellmann theorem.Consistent conclusions are drawn by these two method.The sensitivity to relative variation of fine structure constant could be enhanced by 3-4 orders of magnitude,and to variations of nucleon mass and meson masses are enhanced by about 5-6 orders of magnitude in the 229Th transition.