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

¹ School of Physics, Peking University, Chengfu Road, Haidian District, Beijing, 100871, China
² RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
³ Dept. of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
⁴ Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba, Sendai, Miyagi, 980-8578, Japan
⁵ Dept. of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
⁶ Dept. of Physics, Meiji University, 1-1-1 Higashi-Mita, Tama, Kawasaki, Kanagawa 214-8571, Japan
⁷ Dept. of Physics, Tokyo Gakugei University, 4-1-1 Nukuikitamachi, Koganei, Tokyo 184-8501, Japa
⁸ Dept. of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
⁹ Dept. of Physics, university of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
¹⁰ Dept. of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
¹¹ RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

^a e-mail: yangxf@ribf.riken.jp

Published online: 20 March 2014

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.