Abstract
The SIRIUS facility was developed to isolate short-lived neutron-rich nuclides far from the line of β stability. The installation, which consists of a helium-jet fission-product transport system, an ion source, an accelerator and a deviation magnet, is described. The main characteristics of the whole system can be summarized as: (1) the fission-product transmission to the ion source is about 90%; (2) the mass resolving power is of the order of 500; (3) the total transit time between production and detection is less than 1 s; (4) the overall efficiency of the system is on the average better than 5 × 10−5. The nuclei available for nuclear spectroscopic studies have been examined. With a neutron flux of 5 × 1011/cm2·s and 730 mg for the uranium target, about 50 neutron-rich rare-earth isotopes (many of which had previously been unavailable) are available with sufficient activities for nuclear spectroscopic studies.
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