Seminar Details

The Exotics of Neutron-Rich Rare Isotopes Viewed through High and Low-Energy Reactions

Rituparna Kanungo, Saint Mary's University
Wednesday, September 4, 4:10 PM - Nuclear Science Seminar
NSCL Lecture Hall

The rare isotopes with large asymmetry of neutrons and protons have revealed unexpected structural forms and opened a new view of nuclear shells. Since the discovery of the neutron halo, reaction spectroscopy has been proved to be an immensely sensitive tool to unearth the mysteries of the unknown rare isotopes. The relativistic rare isotopes beam from in-flight facilities and low-energy re-accelerated beams offer complementary scope as will be shown. The evolution of matter radii of neutron rich nuclei along an isotopic chain presents the signatures on unexpected deviations from known systematics of the matter distribution. Nuclear skin or halo are often formed at one approaches the neutron-drip line. In this presentation I will describe our experiments on the determination of matter radii at the FRS, GSI. The oxygen isotopes around the new N=16 shell gap as well as neutron-rich Mg isotopes showing breakdown of the N=20 shell closure will be presented. Recent efforts on neutron-rich Ni isotopes will also be introduced. In order to determine the neutron skin thickness from the matter radii, a knowledge of proton radii is crucial for the neutron-rich isotopes. A new technique of using the charge changing reaction to extract the proton radii will be discussed and first preliminary observations for the neutron-rich boron isotopes will be shown. The low-energy ISOL beams of rare isotopes offer the possibility to make precision investigations through inelastic scattering and transfer reactions. Some observations and ongoing activities in this direction on light nuclei at TRIUMF will be discussed. I will also describe our new reaction facility, IRIS, with a thin solid hydrogen target that was recently commissioned for studying such reactions.