On the role of initial conditions in background suppression for fusion-evaporation reactions
DOI:
https://doi.org/10.63907/ansa.v2i2.86Keywords:
superheavy nuclei, cyclotron, silicon radiation detector, real-time algorithm, background suppressionAbstract
A new approach is presented for optimizing the application of the active correlations method for substantial background suppression in experiments aimed at detecting rare alpha-decay and spontaneous-fission events in complete-fusion nuclear reactions. The proposed optimization steps concern parameters such as the minimum energy of signals attributed to nuclei implanted into a silicon DSSD detector, the time-correlation interval, and the relative loss of target irradiation time. A test using a silicon n-Si(Au) detector and a special ICS-119 unit is described. The amplitude spectrum of registered signals for a nucleus with $Z=119$ is calculated for the DGFRS-2 setup at FLNR JINR using an additional thin aluminum absorber to reduce the background from short-range heavy particles. It is assumed that these parameters will be used in the upcoming experiment $^{249}\mathrm{Bk}+^{50}\mathrm{Ti}\rightarrow 119^*$ in the near future. The background load is estimated on the basis of the experiment $^{242}\mathrm{Pu}+^{50}\mathrm{Ti}\rightarrow \mathrm{Lv}^*$. In this context, the present work can be considered a continuation of several previous studies devoted to the detection system and to the improvement of the ''active'' correlations method in complete-fusion reactions with heavy ions.
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