Beta-delayed fission, laser spectroscopy and shape-coexistence studies with astatine beams

CERN INTC addendum on astatine beams: β-delayed fission, laser spectroscopy, and shape coexistence in a very heavy, very neutron-deficient chain.

ISOLDE astatine beams, in-source laser spectroscopy, and fission-fragment detection after β decay.

Astatine sits where fission barriers and deformation compete. β-delayed fission is a rare probe of that barrier from a state the laser can tag.