Collinear laser spectroscopy on neutron-deficient K isotopes
ORAL
Abstract
The monotonic change of charge radii of K isotopes across $N$ = 20 suggests a reduction of the shell gap. We plan a systematic study of the charge radii and ground state magnetic and quadrupole moments of neutron-deficient $^{35-38}$K isotopes at the BEam COoling and LAser spectroscopy (BECOLA) facility at NSCL/MSU to investigate this anomalous behavior. The first on-line measurement at BECOLA has been for $^{38}$K, which was produced by fragmentation of a $^{40}$Ca beam, thermalized in the ANL linear gas cell, extracted at an energy of 30 keV, and transported to BECOLA. The $^{38}$K ion beam was cooled and bunched, and neutralized in a Na vapor cell. Laser-induced fluorescence was detected as a function of the Doppler-tuned laser frequency and time relative to the release of the beam bunch.
*This work was supported in part by NSF Grant No. PHY-11-02511.
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