"Fortuitous" near-threshold resonances and the curious case of β-p+ decay of 11Be

Prof. Marek Ploszajczak (Hosted by Dickhoff), Grand Accélérateur National d’Ions Lourds (GANIL), Caen, France

Loosely bound nuclei are currently at the center of interest in low-energy nuclear physics. The deeper understanding of their properties provided by the shell model for open quantum system offers new insights into structural phenomena and provides new opportunities for spectroscopic studies for states in the vicinity of the particle emission threshold. 

I will review the recent progress in the open quantum system shell model description of near-threshold collectivity, clustering, and collectivization of electromagnetic transitions in near-threshold states. In particular, I will discuss the structure of the recently observed near-threshold resonance in 11B, whose very existence explains the rare beta-delayed proton emission of the neutron-rich 11Be.