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Abstract
Abstract A system for the on-line detection of very volatile α and spontaneous-fission activities produced in nuclear reactions has been developed. The reaction products are continuously transported by a gas-jet from the target area to the detector unit. Volatile species are condensed on a solar cell kept at low temperature ( ⋍ 40 K ) by a cryogenic pump. An annular surface barrier detector is placed in front of the solar cell. Fission fragments and their energies are recorded by coincidence signals from both detectors, whereas α-particle spectra are measured with the surface barrier detector. The background is less than one coincident event per day, thus allowing measurements at low production rates. A half-life region down to a few seconds can be covered as is shown with short-lived radon isotopes. The system was used in searches for very volatile superheavy elements in the reactions 48Ca+248Cm and 238U+238U.
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Schedule a callMore From: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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