Possibility of Grasers using Nuclear Excitation by Electron Transition
It was recently shown that some transitions of atomic electrons can excite the nuclear state, provided that certain conditions are satisfied. This mechanism, called NEET (abbreviation of nuclear excitation by electron transition), may possibly be used for a graser. Although the NEET probability is much smaller than the atomic excitation that gives rise to NEET, the life-time of the nuclear state is much longer than the corresponding atomic state, and hence is convenient for pumping. Numerical examples show, however, that the necessary pumping power is much higher than the presently available one, but it can be shown that as far as the excitation rate of the nuclear state is concerned, NEET is superior to other methods, such as direct atomic or nuclear excitation. Future progress of this field may solve the problem of the pumping power, in which case NEET may be used for a graser.
KeywordsIonization Cross Section Atomic Transition Nuclear State Nuclear Level Nuclear Transition
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