Effect of thermal conditions on the generation threshold of Mossbauer radiation in a system of of excited nuclei

Авторы: Mantsyzov B.I., Bushuev V.A., Kuz’min R.N.
Журнал: Soviet Journal of Experimental and Theoretical Physics
Том: 53
Номер: 3
Год издания: 1981
Первая страница: 453
Последняя страница: 456
Аннотация: We consider the influence of thermal expansion and of the relaxation processes in the establishment of thermodynamic equilibrium on the attainment of the threshold condition for y amplification in a system of excited short-lived Mossbauer nuclei. It is shown that at an initial crystal temperature T 2 K the threshold condition is not attainable because of the inhomogeneous Doppler line broadening due to the ylaser working-medium linear thermal expansion by the heat released in the pumping and by the absorption of the energy of conversion electrons and of the resonant y quanta. At infralow temperatures T < lO-'-lO-' K the phonon-electron and phonon-phonon relaxation times can exceed the lifetime of the excited states of the nuclei. As a result, the activation and emission of the nuclei will proceed more rapidly than the heating and linear thermal expansion of the sample, so that the attainment of the threshold condition for y amplification in a system of polarized Mossbauer nuclei is feasible in principle.
Добавил в систему: Бушуев Владимир Алексеевич

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