Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

作者：Lynch K M^*; Billowes J; Bissell M L; Budincevic I; Cocolios T E; De Groote R P; De Schepper S; Fedosseev V N; Flanagan K T; Franchoo S; Ruiz R F Garcia; Heylen H; Marsh B A; Neyens G; Procter T J; Rossel R E; Rothe S; Strashnov I; Stroke H H; Wendt K D A

来源：Physical Review X, 2014, 4(1): 011055.

DOI：10.1103/PhysRevX.4.011055

This paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes Fr202-206 performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay-spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes Fr202-206, in addition to the identification of the low-lying states of Fr-202,Fr-204 performed at the CRIS experiment.

• 出版日期2014-3-28