Construction and commissioning of the collinear laser spectroscopy system at BRIF

TL;DR

This paper reports the construction and successful commissioning of a collinear laser spectroscopy system at BRIF, enabling detailed nuclear property studies of unstable isotopes with promising initial results.

Contribution

The paper introduces a newly built CLS system at BRIF and demonstrates its effective on-line operation with stable and unstable isotopes, expanding capabilities for nuclear research in China.

Findings

Hyperfine spectra of $^{39}$K and $^{38}$K are reproduced.

Magnetic dipole hyperfine parameters match literature.

System is operational for future unstable isotope studies.

Abstract

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 ($^{39}$K) and unstable ($^{38}$K) 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.