Construction and commissioning of the collinear laser spectroscopy system at BRIF

We have constructed a collinear laser spectroscopy (CLS) system installed at the Beijing Radioactive Ion-beam Facility (BRIF), aiming to investigate the nuclear properties of unstable nuclei. The first on-line commissioning experiment of this system was performed using the continuous stable (K-39) and unstable (K-38) ion beams produced by impinging a 100-MeV proton beam on a CaO target. Hyperfine structure spectra of these two isotopes are reasonably reproduced, and the extracted magnetic dipole hyperfine parameters and isotope shift agree with the literature values. The on-line experiment demonstrates the overall functioning of this CLS system, opening new opportunities for laser spectroscopy measurement of unstable isotopes at BRIF and other radioactive ion beam facilities in China.

Automated summary

We have constructed a collinear laser spectroscopy system at the Beijing Radioactive Ion-beam Facility (BRIF) to study the nuclear properties of unstable nuclei. In the first on-line commissioning experiment, we reproduced the hyperfine structure spectra of stable and unstable isotopes and obtained magnetic dipole hyperfine parameters and isotope shift values consistent with literature. This experiment demonstrates the functionality of the CLS system and opens up new opportunities for laser spectroscopy measurement of unstable isotopes in China's radioactive ion beam facilities.