1. XXIV International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 9-16 September, 2013. A.A. Voinov,V.G. Subbotin,A.M. Zubareva A.A. Voinov, V.G. Subbotin, A.M. Zubareva Joint Institute for Nuclear Research, 141980 Dubna, Russia New multichannel charge-sensitive preamlifier with the autocalibration mode

2. 12 strips of 3*(40mm*10mm) 300 μm each in focal plane with vertical position sensitivity Particals’ signals: ERs, alphas, FF Efficiency 87% of 4π for a-particles 87% of 4π for a-particles 100% of 4π for FF 100% of 4π for FFResolution 60-90 keV for focal plane detectors 60-90 keV for focal plane detectors 140-200 keV for side detectors 140-200 keV for side detectors Δy = 0.9-1.9 mm for ER-α correlations Δy = 0.9-1.9 mm for ER-α correlations and 0.5-0.9 mm for ER-SF and 0.5-0.9 mm for ER-SF Gas-Filled Recoil Separator New FPD: 32 strips of 2*(60*60 mm 2 ) SSSSD, 24 strips of 6*(60*60 mm 2 ) side detector And corresponding registering system 35-70 keV for focal plane detectors 80-120 keV for side detectors 80-120 keV for side detectors Δy = 1.1-1.8 mm for ER-α correlations Δy = 1.1-1.8 mm for ER-α correlations and 0.5-1.2 mm for ER-SF and 0.5-1.2 mm for ER-SF

3. Front and Rear views of the new DSSSD (48 by 128 strips, 1mm width each) with 48*128 mm 2. 48*128 strips granularity equals to ~3000 individual detector cells.

5. OpAmpl – ADA4817-1, ultrahigh speed (1 GHz) voltage feedback amplifiers with FET inputs, low noise (4nV/  Hz), Supply current per amplifier: 19 mA – www.analog.com

6. Precision generator of the spectrometric double-pulses of the amplitude of high stability (ΔA = 0.05%/°C). Testing system for 16-channels preamplifier check-up

8. Table 1 C sourse, in pFNoise, in keV 0 38 96 220 11,4 15,5 24,3 41,4 Main PUDIK characteristics ( no tests for stability were performed ) Input/Output polyarity - Inverted Energy sensitivity (Si) - 8 mV/MeV Negative feedback constant - 22 MΩ/5.6 pF Noise characteristics - See Table 1 Power supply - +/-6V

9. Conclusion The noise characteristic (11.4 keV, C In =0) should be noticeably decreased (appropriate value < 3 pF) But: Corresponding testing system is developed to simulate the DSSSD response from a real charged particle The first sample of the 16-channels spectrometric charge sensitive-preamplifier is created to be employed in the future DSSSD based measuring system The system controlling the connection of the pulser (УПОГ) to the 16-channels preAmpl should be developed for connection upto 11 boxes (to serve 128+48 spectrometric channels) New more complicated PCB’s design is needed (with probable enlarge size of the PCB and the box) Definitly a fast FET transisitor needed at the Input with good noise characteristic (~1 pF/√Hz)

10. Thank you for your attention

11. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. Dubna Gas Filled Recoil Separator 12 strips 300μm 40mm*10mm each in focal plane Particals’ signals: EVRs, alpha, FF Measurement: energy, (x,y), time Efficiency 87% of 4p for a-particles 87% of 4p for a-particles 100% of 4p for FF 100% of 4p for FF

12. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. Block diagram of the measuring electronics (only one detector circuit is shown completely).

13. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. Diagram of the logic of the registration of nuclear reactions products at DGFRS

14. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. Energy spectrum of a-particles detected in the natYb + 48Ca reaction. Spectrum of total energies deposited by the fission fragments of 252No implants as measured by the both focal-plane and side detectors (blue line) and by the focal-plane detector only (red line). 48 Ca + nat. Yb + 206 Pb 48 Ca

15. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. ER-a and ER-SF time intervals measured for 217Th and 252No produced in 48Ca-induced reactions with natYb and 206Pb, respectively. Dependence of ER-a position resolution (FWHM) on the amplitude of a-particle signal. The position resolution was derived by examining the atYb+48Ca data for escaping a particles depositing varying mounts of energy in the focal-plane detector. Spectra of measured energies of implants 217Th (left), 252No (right) and superheavy nuclei with Z=112-118 (middle). Solid histogram shows energies of Z=117 recoils observed in the reaction 249Bk+48Ca. Distributions of position deviations of ER-a and ER-SF signals measured for 217Th and 252No produced in 48Ca-induced reactions with natYb and 206Pb,respectively.

16. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. a) Total energy spectra of beam-on a-like signals and beam-off particles. Energy spectra recorded during the 252 MeV 48Ca+ 249Bk run (E=39MeV). b) Total fission-fragment energy spectra, both beam-on and beam-off. The arrows show the energies of events observed in the correlated decay chains.

17. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. Results High efficiency of rare decays detecting Good energy and position resolution (35 keV and 0.9 mm for the unirradiated detectors) Low system “dead-time” T = 8 us Operating in low background conditions for the descendant decays Future New double side silicon strip detector array (x: 128 channels, y: 48 channels – 6144 cells) Apropriate modern digital electronics (based on PIXIE-16) “dead-time” less 1 us Operating in better background conditions

18. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. Thank you for the attention

19. XXIII International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 12-19 September, 2011. a) Spectra of measured energies of Z=112-118 nuclei (grey) and element 117 implants (black). Spectrum of 252No recoils is shown for comparison. b) Position deviations of all signals (ERs, a-particles, and SF fragments) in the observed decay chains of Z=117 isotopes. The position of one a-article deviates from the average value by more than 2 mm, caused by the low energy, Ea=1.2 MeV, deposited in the focal-plane detector resulting in degraded position resolution. c) Spectrum of total energies deposited by the fission fragments of 252No measured by the both focal-plane and side detectors. Fission-fragment energies of 281Rg observed in the decay chains of 293117 are shown by arrows. d) Relative time intervals of all events in the observed decay chains of 293117 (l=ln2/T1/2) compared with the average half-lives assigned to the appropriate nuclides.