8-12 July 2013
Africa/Johannesburg timezone
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Study of octupole vibrations in nearly spherical nuclei.

Presented by Ms. Nontobeko KHUMALO on 10 Jul 2013 from 17:40 to 18:40
Type: Poster Presentation
Session: Poster2
Track: Track B - Nuclear, Particle and Radiation Physics


Recent studies of double octupole states in 146Gd have resulted in the need of deep studies to be done on two-phonon octupole excitation in 146Gd. Octupole vibrations come closer to the ideal harmonic oscillator as a result of the larger number of particles participating in the motion and the weaker mixing of negative-parity states at low excitation energies. Octupole vibrations are, however, much more complex than the other modes of vibrations, such as dipole and quadrupole, and little is known about them. This vibrational mode is a result of a vibrating nucleus that undergoes pear-shaped distortion, with “stem end” and the “blossom end” exchanging places periodically. In this project we study the octupole vibrations in the even-even nearly-spherical nucleus 146Gd82. A state with J=6+ at 3485 keV has already been suggested in 146Gd, and together with the finding, for the first time, of a 6+ → 3- → 0+ cascade of E3 γ-ray transitions, this has been interpret as the two-phonon octupole excitation. So the aim of the project is to investigate this 6+ state and other missing members of the octupole quartet in order to accurately characterize two-phonon octupole vibrations in nearly-spherical nuclei.






Prof J.N Orce, jnorce@uwc.ac.za, University of the Western Cape



Primary authors