Session C7 - Mini-Symposium on Emergent Phenomena in Nuclei.
INVITED session, Saturday afternoon, April 05
Regency Ballroom C1, Loews Philadelphia Hotel
Near stable nuclei below the Z=50 shell gap show a wide range of nuclear structure phenomena, including 'textbook' examples of vibrational collectivity at low spins, which give way to more rotational-like sequences with increasing angular momentum. This paper will review the results of a number of recent experiments in nuclei in this region using both deep-inelastic and fusion-evaporation reactions to populate nuclei towards the neutron-rich side of the valley of stability. While the high-spin data is consistent with predictions from mean-field, rotational model theories, if a simple empirical prescription is applied to the stretched E2 yrast states, a clear picture emerges of how these two mechanisms (i.e., vibrational and rotational) of collective spin generation compete in this, and other regions of the Segre chart.