Review of the some specific features of the detecting of heavy recoils

Abstract

In this paper, we present the results of the first beam tests of the detection system at the focal plane of the Dubna Gas-Filled Recoil Separator-2 (DGFRS-2), which receives beams from the DC-280 FLNR cyclotron. The high beam intensity of ${}^{48}$Ca${}^{+10}$ heavy ions from the cyclotron enables us to obtain a number of superheavy recoils sufficient to compare both the measured and calculated spectra of superheavy recoils implanted into a silicon detector. A real-time algorithm to search for an Evaporation Residue (ER) -- $\alpha$ correlated sequences is described in brief. It should be noted that the DGFRS-2 spectrometer operates in conjunction with the 48x128 strip DSSD (Double-sided Silicon Strip Detector; 48x226 mm2) detector and a low-pressure pentane-filled gaseous detector (1.2 Torr; 80x230 mm${}^2$). A block-diagram of the spectrometer and the event format are also presented. Special attention is paid to the response of a low-pressure pentane-filled DeltaE multiwire proportional chamber for recoils of Fl, synthesized in the ${}^{242}$Pu+${}^{48}$Ca $\to$ ${}^{287}$Fl +3n complete fusion nuclear reaction. Some actual parameters of the detection system have also been extracted from ${}^{\mathrm{nat}}$Yb + ${}^{48}$Ca, ${}^{232}$Th + ${}^{48}$Ca, ${}^{243}$Am + ${}^{48}$Ca, ${}^{238}$U + ${}^{48}$Ca reactions. The effect of neighbor strip charge sharing for the ohmic side of the DSSD detector is also under consideration.

18 pages