About a possibility of a decrease in the radiative width of excited levels of atoms and nuclei

I. V. Krasnov, N. Ya. Shaparev

An analysis is made of the two-photon absorption of radiation by nuclei subjected to two opposed $gamma$-ray fluxes. The absorption cross section has two maxima separated by the recoil energy. The higher maximum, of width GAMMA governed by the radiative damping, is associated with the recoilless absorption; the lower maximum, of width governed by the Doppler effect, describes the absorption in the presence of recoil. The low maximum makes it possible to attain low values of the parameter GAMMA/$omega$. (AIP)

S. P. Goreslavskiǐ, Nikolai B. Delone, В. П. Крайнов

Boris Michailovich Smirnov

Лев Абрамович Ривлин

It is shown that due to the quantum coherence of atoms in a Bose—Einstein condensate, the width of gamma lines of the long-lived metastable states of isomeric nuclei in these atoms can be close to the natural radiative width. This opens up the possibility of observing super-narrow gamma lines, which are narrower by a few orders of magnitude than the Mössbauer gamma line.

Vladimir V Koltsov

The well-known narrowing of the Mössbaur γ-line with increasing age of the excited energy state ℏω0 of the emitter nucleus (the half-life is T1/2) and broadening of the γ-line with decreasing irradiation time of the absorber nucleus are analyzed. Taking into account the short time of emission of quantum transition energy – much less than T1/2, which can be seen, for example, from the duration of the γ-signal on the scintillator, the analysis leads to the idea of the structure of the γ-quantum (photon) as an electromagnetic wave of frequency ω0 that does not carry energy (0-wave), which is emitted by the nucleus from the moment of formation of the excited state to the quantum transition, with the energy quantum ℏω0 in the form of a short-term singularity on the “tail” of this 0-wave. A possible source of 0-waves can be virtual transitions of the nucleus from the excited state to the ground state and back before the emission of an energy quantum. Detection of 0-waves is possible due to changing the width of the γ‑line with additional irradiation of the absorber nuclei by resonant 0-waves. The possibility of predicting the future decay of an excited state by 0-waves detecting and the prospects of using 0-waves for information transmission are noted. The principle of a 0-wave generator without energy radiation is proposed.

Pavel Bogdanovich, G. L. Zhukauskas, Alina Momkauskaitė