Exotic Quantal Rotation in Nuclei (Umesh Garg (University of Notre Dame))

Wednesday 22 Jul 2015, 11:00 → 12:00 Asia/Tokyo

Nishina Hall (RIKEN Wako)

-------------------------------------------------------------------- Announcement of the CNS Seminar on Jul 22(Wed) ==================================================================== Venue: Nishina Hall Date: Jul. 22 (Wed) 11:00 - 12:00 * The talks will be given in English. Speaker: Prof. Umesh Garg (University of Notre Dame) Title: Exotic Quantal Rotation in Nuclei Abstract: In this talk, I will present recent results on some novel modes of nuclear motion--chiral rotation, wobbling, and tidal waves. A triaxial nucleus becomes chiral if it rotates about an axis that lies outside the three planes spanned by the principal axes of its triaxial ellipsoidal shape. In our measurements on the nucleus 135Nd, we observed the first clear evidence for a transition from chiral vibrations to chiral rotation. More recently, we have discovered the first case of multiple chiral bands in the nucleus 133Ce. Wobbling is another phenomenon associated with triaxial nuclei. The concept of transverse wobbling involves alignment of the odd-particle along the "short" axis of an odd-A triaxial nucleus. We have observed transverse wobbling bands in the nucleus 135Pr. This is the first time that wobbling bands have been observed in a mass region other than A~160 where wobbling bands were first discovered. The concept of nuclear tidal waves is based on the observation that the yrast states in a phonon multiplet represent waves that travel over the nuclear surface akin to tidal waves over the ocean surface. This accounts for the experimental result that the yrast states in vibrational nuclei have a rotational-like structure for which a sound theoretical basis, especially at higher spins, has been lacking so far. In our measurements of B(E2)'s in the yrast band of 102Pd, we have found consonance with the theoretical expectations. Contact person: Ken Yako (CNS) * Prof. Garg's visit is supported by JUSEIPEN.