Very low energy conversion electron detection system at the ISOCELE on-line isotope separator, Orsay

Decay of 185Tl, 185m+gHg, 189m+gPb and energy location of the 13/2+ isomeric states in 185Hg, 189Pb, 193Po and 197Rn

“…However, this hypothesis is highly improbable since no 5/2 − state is expected to be located at so low energy in 185 Hg from systematic energy studies performed for known states in It is worth noting that the conversion electron lines of the 51.9 keV transition detected in the 185 Tl β + /EC decay (sect. 2) are not observed in the electron spectrum, which proves that this 51.9 keV transition does not participate to the de-excitation of the 13 fig. 4.…”

“…A measurement of the low-energy conversion electrons emitted from 185m+g Hg radioactive atoms were carried out using the VLECED system [13] that was installed at the ISOCELE facility [25]. Mercury atoms were produced by (p, xn) reactions on a molten gold target placed inside the ISOCELE mass separator ion source [26,27].…”

“…New α particles emitted from the 189m+g Pb nucleus have been detected during the latter experiment. They can serve to determine the energy location of the 13 185 Hg nucleus and build a low-energy low-spin level scheme of 185 Hg, a new study of the β + /EC decay of the 185 Tl nucleus has been performed, the experimental procedure and the results will be presented in sect. 2.…”

“…The decay of 185m+g Hg was studied by use of a Very Low-Energy Conversion Electron Detection, VLECED, setup [13]. The preliminary results of this experiment were reported in a conference only [14].…”