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

X F Yang ,T Shinozuka,K Yoneda,T Sonoda,A Hatakeyama,Y Mitsuya,Y Kondo,H Ueno,Hisanori Fujita ,Miki Hayasaka ,T M Ito ,K Asahı ,Tooru Kobayashi ,Yuji Ishibashi ,Yuta Ebara ,Takashi Wakui ,H Shirai,M Nishimura,M Wada,S Nishimura,T Furukawa,Y Ichikawa,K Imamura,T Shimoda,Yukari Matsuo

doi:10.1051/epjconf/20146611041

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 84–87 Rb beam. Details of the current setup, experimental results using this method are presented.

Highlights

For in-situ laser spectroscopy of atom immersed in He II, trapping RI beam at observation region with laser irradiation is crucial
An effective method for adjusting and observing the stopping position of energetic RI beam in He II has been demonstrated with the primary 85,87Rb and secondary 84,86Rb beams
The feasibility of the method aimed to trap energetic RI at an accurate position in He II was confirmed by the intercomparison of the LISE++ calculation and the experimental results with 84−87Rb beam

Summary

Introduction

EPJ Web of Conferences with extremely low yield. The OROCHI technique is developing and improving with the offline and online experimental research of stable atoms [4,5,6]. For in-situ laser spectroscopy of atom immersed in He II, trapping RI beam at observation region with laser irradiation is crucial. An effective method for adjusting and observing the stopping position of energetic RI beam in He II has been demonstrated with the primary 85,87Rb and secondary 84,86Rb beams. We will present the setup, working procedure and results of the experiment for this method. The calculation results with LISE++ program [7] using Zeigler code [8] are reported for a prior estimation and a comparison with experimental result

Experimental setup

Calculated and experimental results

Summary