Una giornata con Bob Charity: "Bridging two-proton emitters and neutron halos"

by Prof. Robert J. Charity (Washington University, St Louis)

Thursday 3 Apr 2014, 14:30 → 15:30 Europe/Rome

131 (INFN edificio C)

The lightest nuclei which undergo prompt two-proton decay, 6Be and 8C, are also mirror nuclei of the lightest multi-neutron halo systems, 6He and 8He. This is no accident; in fact these mirror nuclei are connected or bridged by isospin multiplets where all members are expected to have similar structure. In this work I will describe measurements of the ground-state two-proton decay of 6Be, 8C, 12O, 16Ne at MSU (using the HiRA array) and at the Texas A&M facility. In addition to ground-state decay, we also have observed two-proton in the intermediate members of the isospin multiplets, for instance the isobaric analog state of the 8C in 8B. These represent a new class of two-proton emitters, where prompt two-proton decay is the only isospin-conserving decay mode. These ideas will be extended to the isospin sextet which contains the canonical neutron-halo nucleus 11Li where we have observed two-proton decay from its double isobaric analog state in 11B. We will then discuss the use of the Isobaric Multiplet Mass Equation to learn about isospin violation in these systems and the extent of the 11Li neutron halo. Finally we will discuss what nuclear-structure information can be gleaned from the correlations between the momenta of the three decay fragments in two-proton decay.

Slides twoproton.pdf