COLLAPS experiment

The purpose of the experiment is to investigate ground and isomeric state properties of exotic, short lived nuclei, including spins, electro-magnetic moments and charge radii.

[4] This describes a method of obtaining narrow absorption lines, specifically providing a sensitivity ideal for experiments on short-lived isotopes.

[7] The ions are delivered to the COLLAPS beamline and are excited using tunable continuous-wave lasers through the technique of collinear spectroscopy.

[3] Laser spectroscopy is better performed on a neutral atom, and therefore a charge exchange cell (CEC) is needed to neutralise the ionic beam from ISOLDE.

[7] A CEC neutralises the ions by causing the ionic beam to collide with the alkali vapours in the cell and transfer charge.