[Triumf-seminars] TRIUMF ISAC Seminar today at 15:15

[postmaster@admin.triumf.ca]

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Date/Time: Wed 2005-03-02 at 15:15

Location:  Auditorium          

Speaker:   Chakrawarthy Ravuri (TRIUMF)

Title:     Asymmetric Quantum Rotors

Abstract: In the beginning there were just the ground state rotational bands and beta/gamma vibrational bands. Later on, experiments with moderate Compton-suppressed Germanium detector arrays led to side-band spectroscopy, discoveries of Superdeformation and band-termination at high-spins. These experiments have tested nuclear models based on a 1-d rotation. Since the last decade, large Gamma detector arrays have added a new dimension in the Gamma-ray spectroscopy of exotic modes of nuclear rotation.

In the present talk exotic modes of nuclear rotation manifesting due to the breaking of the axial symmetry and signature symmetry will be presented. Stable axial asymmetry greater than the zero-point fluctuations has recently been discovered. The experimental data is construed as a direct evidence for the wobbling mode, and hence a realization of a full 3-d nuclear rotation. Two dimensional rotations break the signature symmetry leading to, magnetic/antimagnetic rotation in weakly deformed nuclei, and the realization of tilted-bands in deformed nuclei. A few selected examples of these scenarios will be discussed.





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