Abstract
Since 1973 two new recoil spectrometers for the study of the products of the thermal neutron induced fission are in operation: the parabola spectrometer LOHENGRIN and the gas-filled separator JOSEF. Their analyzing features have been considerably improved compared to older facilities of similar type. Thus the high mass and energy resolution and the good intensity of LOHENGRIN enable a systematic determination of the fractional independent fission yields. Because of the increased mass and nuclear charge resolution JOSEF offers special possibilities for the investigation of β-decay chains and of β-decaying isomeric states. The applications which recoil spectrometers find at heavy ion accelerators are the selection of the rare reaction products out of the intense beam of projectiles and the analysis of the basic properties such as mass, nuclear and ionic charge, kinetic energy and emission angle of the reaction products.
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