An effective method for trapping ion beams in superfluid helium for laser spectroscopy experiments

Abstract

A novel laser spectroscopy technique -"OROCHI" (Optical Radioisotopes Observation in Condensed Helium as Ion-catcher) has been proposed. This method aimed to investigate the structure of exotic nuclei systematically by measuring nuclear spins and moments. For in-situ laser spectroscopy of atoms in He II, a method to trap atoms precisely at the observation region of laser is highly needed. In this work, a setup composed of a degrader, two plastic scintillators and a photon detection system is further tested and verified for adjusting and checking the stopping position of 84-87Rb beam. Details of the current setup, experimental results using this method are presented. © Owned by the authors, published by EDP Sciences, 2014.