Effect of synchrotron radiation on nuclear beta decay

Nuclear Alpha Decay in Field of Synchrotron Radiation

“…In this case, the values of the energy transferred to the nucleus are already quite large and comparable with nuclear ones. In this case, beta transitions, which are prohibited under natural conditions, become possible, and beta transitions, which are allowed, will be accelerated [5,6]. The high power of SR from thirdgeneration synchrotrons makes it possible to hope that, in contrast to beta decay stimulated by laser radiation, it will be possible to obtain the rates of the corresponding decays and their accelerations available for observation.…”

Beta decay of 115In to the first excited level of 115Sn: Potential outcome for neutrino mass

“…The calculated cross-sections of the γ-β process are quite low: of the order of 10 −49 -10 −45 cm 2 , depending on the Z of the parent nucleus, on E γ and on the energy threshold [23]. Nevertheless, it was calculated that in a field of intensive synchrotron radiation from the SPring-8 source (Japan), the β decay of 115 In could go faster by 2 orders of magnitude [23]. However, scaling the SPring-8 intensity of ∼10 17 γ/(s·mm 2 ·mrad 2 ·keV) to the γ radiation intensity in our measurements, <0.1 γ/(s·keV) (see Fig.…”

“…The process could be actual in the case of strong electromagnetic fields in stars [22] or in a field of synchrotron radiation [23], but also in the searches for extremely rare processes, like ours. If the 115 In nucleus absorbs a γ quantum with energy E γ >114 keV from an external source, or even a bremsstrahlung γ from 115 In β decay itself, the second excited level of 115 Sn, with energy 612.8 keV, could be populated (spin changes from 9/2 + to 7/2 + , and this is an allowed β transition).…”