Publication Date:
2014-09-17
Description:
A new data acquisition system including a Field Programmable Gate Array (FPGA) based time-resolved scaler was developed for laser-induced fluorescence and beam bunch coincidence measurements. The FPGA scaler was tested in a collinear laser-spectroscopy experiment on radioactive 37 K at the BEam COoler and LAser spectroscopy (BECOLA) facility at the National Superconducting Cyclotron Laboratory at Michigan State University. A 1.29 μs bunch width from the buncher and a bunch repetition rate of 2.5 Hz led to a background suppression factor of 3.1 × 10 5 in resonant photon detection measurements. The hyperfine structure of 37 K and its isotope shift relative to the stable 39 K were determined using 5 × 10 4 s −1 37 K ions injected into the BECOLA beam line. The obtained hyperfine coupling constants A ( 2 S 1/2 ) = 120.3(1.4) MHz, A ( 2 P 1/2 ) = 15.2(1.1) MHz, and A ( 2 P 3/2 ) = 1.4(8) MHz, and the isotope shift δν 39, 37 = −264(3) MHz are consistent with the previously determined values, where available.
Print ISSN:
0034-6748
Electronic ISSN:
1089-7623
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
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