Results 1 - 10 of 410975
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[en] Thermal Ionisation Mass Spectrometry is an internationally recognised technique for determining the isotope ratio and concentrations of different elements including actinides with the highest precision and accuracy
[en] The philosophy behind the experimental approach is described. A list of reports on completed work is given. Comments are offered on work on Au, Tl, and Hg isotopes, neutron-deficient nuclei with 50 less than or equal to (Z,N) less than or equal to 82, and neutron-rich nuclei with 28 less than or equal to Z less than or equal to 50 and 50 less than or equal to N less than or equal to 82. No data are presented, as this work has been reported at length in numerous reports and journal articles. Experimental equipment and procedures and data analysis are summarized briefly
[en] Full text: Exotic nuclei beyond the 132Sn double-shell closure are influenced by both the Sn superfluidity and the evolving collectivity only few nucleons away. Toward even more neutron-rich nuclei, especially at intermediate mass number, interplay between single-particle and collective particle-hole excitations compete. In some cases with the extreme addition of neutrons also other effects as the formation of neutron skin , stabilization as sub-shell gaps , and/or orbital crossings  may be expected. The knowledge of nuclear ingredients is especially interesting beyond 132Sn and little is known on how the excitations modes develop with the addition of both protons and neutrons [4-7] and for example systematic prompt and decay lifetime studies can be a very sensitive probe. Recently, we have approached this region of nuclei in several measurements following fission as 238U on 9Be target, within the EURICA project [8-9], n-induced fission on 235U/241Pu targets using prompt-decay spectroscopy within the EXILL/FATIMA campaigns [10-11], as well as in decay spectroscopy at LOHENGRIN. Examples from these studies on several nuclei in the region will be presented together with the possible interpretation of the new data.
[en] We study the role of intruder states and shape coexistence in the even-even "1"9"0"–"2"0"6Po isotopes, through an interacting boson model with configuration mixing calculation. We analyzed the results in the light of known systematics on various observable in the Pb region, paying special attention to the unperturbed energy systematics and quadrupole deformation. We find that shape coexistence in the Po isotopes behaves in very much the same way as in the Pt isotopes, i.e., it is somehow hidden, contrary to the situation in the Pb and the Hg isotopes
[en] Modified macroscopic-microscopic calculations of the potential energy of nuclei in the Ra-Th region are performed. A stable octupole deformation of the nuclei is obtained. The lowest Kπ = 0- states are interpreted as being associated with this deformation. (orig.)