A recently developed portable, on-line capability for γ-ray and conversion-electron spectroscopy, HIGH-TATRA is demonstrated with its application to the study of 183 Hg 183 Au at ISOLDE. Key details of the low-energy level scheme of the neutron-deficient nuclide 183 Au populated in this decay are presented. A broad energy germanium detector is employed to achieve this (the first-ever use of such a device in decay-scheme spectroscopy), by way of a combination of high-gain γ-ray singles spectroscopy and γ-γ coincidence spectroscopy. Further, by combining the γ-ray detectors with a liquid-nitrogen-cooled Si(Li) detector operated under high vacuum, conversion-electron singles and e-γ coincidences are obtained. These data
A new technique of elucidating β-decay schemes of isotopes with large density of states at low excitation energies has been developed, in which a Broad Energy Germanium (BEGe) detector is used in conjunction with coaxial hyperpure germanium detectors. The power of this technique has been demonstrated on the example of 183 Hg decay. Mass-separated samples of 183 Hg were produced by a deposition of the low-energy radioactive-ion beam delivered by the ISOLDE facility at CERN. The excellent energy resolution of the BEGe detector allowed γ rays energies to be determined with a precision of a few tens of electronvolts, which was sufficient for the analysis of the Rydberg-Ritz combinations in the level scheme. The timestamped structure of the data was used for unambiguous separation of γ rays arising from the decay of 183 Hg from those due to the daughter decays.
The excited level structures of 202 Tl and 203 Pb, above the 7 + and 29/2 − isomers, respectively, have been studied. An isomer with I π = 20 + and T 1/2 = 215(10) μs has been established in 202 Tl, and the level scheme extended from I = 10 to 20 h with the placement of fifteen new transitions. In 203 Pb, the I π = 37/2 + state is established to be metastable, with T 1/2 = 2.5(3) ns. Levels in both nuclei arise from intrinsic excitations, with likely particle-hole character for the higher-lying states in 203 Pb. The 20 + isomer in 202 Tl is most likely associated with a π h −1 11/2 ⊗ ν(i −2 13/2 , f −1 5/2 ) configuration, while the 37/2 + state in 203 Pb results from the excitation of five neutrons. Calculations, using both an empirical approach and the OXBASH code, have been performed to aid in the description of the excited level structure.
The β + /EC decay of mass separated samples of 181 Hg was studied employing the TATRA spectrometer at the ISOLDE facility at CERN. The decay scheme was constructed for the first time. A Broad Energy Germanium detector was used to achieve this by combination of high-gain γ-ray singles spectroscopy and γ-γ coincidences. The systematics of excited states associated with the 1h 11/2 proton-hole configuration in odd-Au isotopes was extended.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.