On the Question of Electron Bridge for the 3.5-eV Isomer of229Th

Resonance Conversion as the Predominant Decay Mode of $$^{229m}$$ Th

“…1 (Figure 3). For the total R factor, the value of R ¼ 4788 was obtained, which is in agreement with that reported earlier [2].…”

“…We note, however, that many attempts were based on a rather long estimated lifetime of the isomer, within 10 h, aimed at search for soft nuclear photons with the energy of $ 3.5 eV. It was however shown in [1,2] that the main decay mode occurs via the resonance IC ( Figure 1). In this process, the nuclear energy is also transferred to the atomic electrons.…”

3.5-eV isomer of 229mTh: How it can be produced

“…Refs. [3][4][5][6][7][8][9][10][11][12][13][14] and references cited therein). At the same time, for application of the 3.5-eV isomer of 229Th one needs first of all much more precise knowledge of its properties, such as the separation energy of the doublet states, and the electromagnetic strength of the transition.…”

Pumping 229m Th by Hollow-Cathode Discharge

“…Mode 1 is TEEN according to Karpeshin [15] and this process is expected to be dominant [16] so that one will be able to detect delayed photons through atomic deexcitation, for example, |7p 1/2 > to the uncoupled atomic GND |6d 3/2 > or its degenerate counterpart |7s> as well as mode 2. However, first we will measure a decay (mode 3) to avoid photon background.…”