Measuring the Nuclear Charge of Fission Fragments Using a Large Ionization Chamber - Part of the Double-Arm Time-of-Flight Spectrometer

摘要

Identification of decay products is a relevant task in studying rare collinear decays of low excited heavy nuclei. A technique for measuring the nuclear charge of decay products detected by a wide-aperture ionization chamber - a part of the double-arm time-of-flight spectrometer - is described. Two versions of nuclear charge calibration using data of the reaction ~235U(n_th, f) have been developed to determine the charge of the decay products. Testing with simulation data shows that the use of charge parameterization based on the Bohr-Willer empirical equation in the calibration procedure makes it possible to determine the nuclear charge of the fission fragments over a wide energy range. The charges of light ions from He to C, predicted on the basis of this approach, appear to be overestimated by two charge units.