Shape evolution in even-even N≤126, Z≥82 nuclei
The shape evolution in the neutron-de cient lead, polonium and radium nuclei
has been investigated via in-beam and delayed y-ray and conversion electron
spectroscopy. The lead isotope 180Pb is found to still exhibit prolate excited
structure, related to the known intruder structures in the heavier isotopes.
The production cross-section of 180Pb was only 10 nb, one of the lowest ever
employed in an in-beam experiment. A candidate for an excited prolate band
was found in 192Po, making it the rst polonium isotope for which both oblate
and prolate rotational bands have been established. Contrary to the previous
results, the current experiments indicate that the onset of deformation in the
radium isotopic chain seems not to take place yet in 206Ra. Based on the very
similar decay patterns obtained in several in-beam experiments on the neutronde
cient nuclei in the region and on the statistical limits of detection, three
possible further cases for experiments are proposed. Methods developed for
the data analysis, specially aimed at the studies of exotic nuclei, are presented.
...


Publisher
University of JyväskyläISBN
978-951-39-3858-1ISSN Search the Publication Forum
0075-465XKeywords
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- Väitöskirjat [2672]