A new on-line mass analyzing device consisting of an ion guide connected to a commerical quadrupole mass spectrometer is in preparation at the Department of Physics, in University of Jyväskylä. It differs from our present Ion Guide Isotope Separator On-Line (IGISOL) in three essential ways: (a) a small economical quadrupole spectrometer is used instead of a magnetic separator, (b) the whole device operates at ground potential, and (c) electric voltages lower than 50 V are used in bringing ions through a differential pumping section into a high vacuum. The new spectrometer is expected to have similar properties as the IGISOL: excellent stability, similar separation efficiency for all chemical elements, and short separation time. It is intended to be a multi-purpose instrument useful in many fields of research; a few examples related to our own work are given.
The nuclei close to the N = 104 show an interesting feature. Extremely large shape staggering in the isotope and isomer shifts was observed for Hg and TI isotopes , and shape coexistence at low excitation energy was observed for Hg, Au, and Pt isotopes. It should also be noted that many high-spin isomers exist in the nuclei of this region, such as Hf, Wand Os. For many elements in this region, however, laser spectroscopy has not been reported, because these elements are refractory ones. At R1KEN, we have constructed an 1SOL system GAR1S/1GISOL which is powerful to extract radioactive isotopes of refractory elements. Taking full advantages of this feature, we aim at performing collinear laser spectroscopy to study exotic nuclei of these elements. To make on-line collinear laser spectroscopy, the radioactive beams from the GARIS/IGISOL is required to have adequate quality (velocity spread) and quantity. Therefore, direct measurement of the velocity spread of Ar 1 + ion beams from the IGISOL was carried out with a technique of laser spectroscopy. The skimmer-potential and the gas-cell pressure dependences of the velocity spread were systematically investigated. A new focusing device SQUEEZER was introduced to reduce the velocity spread, and the effect of this was experimentally examined. From these measurements, it was pointed" out that the ion beam from the GARIS/IGISOL has adequate quality for making collinear laser spectroscopy. An estimation of the yield of radioactive isotopes from the GARIS/IGISOL was also made for a fusion reaction 9 Be(166 Er, xn)175-X H f. The estimated yield was expected to be more than 10 4 particles/so The yield of the radioactive isotope is adequate to make collinear laser spectroscopy with a coincidence method. We have for the first time in the world extracted the radioactive isotope of refractory element 169Hf with the GAR1S/1G1SOL. We conclude, thus, that the collinear laser spectroscopy of refractory elements with the GARIS/IGISOL is promising.
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