1. "Dead-time" reduction of the detection system of the Dubna Gas-filled Recoil Separator V.G.Subbotin, Yu.S.Tsyganov, A.A.Voinov, A.M.Sukhov, A.N.Polyakov, S.N.Iliev Joint Institute for Nuclear Research, 141980 Dubna, Russia XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.

2. Layout of the Dubna gas-filled recoil separator (DQQ configuration)

3. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.

4. Layout of the Dubna gas-filled recoil separator (DQQ configuration)

5. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007. Si focal plane box of PIPS detectors Particals’ signals: EVRs, alpha-, FF Efficiency 87% of 4p for a-particles 100% of 4p for FF Resolution 60 keV for focal plane detectors 100 keV for side detectors Dy = 0.9-1.9 mm for EVR-α correlations and 0.5-0.9 mm for EVR-SF 12 strips 40mm*10mm each in focal plane surrounded by 8 side detectors 40mm*40mm without position sensitivity and 3 additional detectors in “veto” mode

6. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007. Block diagram of the measuring electronics (only one detector circuit is shown completely).

7. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007. Diagram of the logic of the registration of nuclear reactions products at DGFRS

8. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007. The new logical block KL-203 to control the work of ADCs

9. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007. Summary The new logical block was designed and tested in the test reaction nat Yb+ 48 Ca (for example, 220 Th with T  10 μs). “Dead-time” of the modern registration system is 8  s. In the experiment 249 Cf+ 48 Ca three decay chains originating from the parent isotope 294 118 were detected (the half-lives of all the nuclei are longer than about 1 ms). 294 118 Further investigation of the region of superheavy nuclei, e.g, nuclides with Z=120 in the reaction 244 Pu+ 58 Fe definitely requires applying of this system because of the short half- lives (~10-50  s) expected for the isotopes 298,299 120.

10. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007. Thank you Thank you

11. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007. References Yu.A. Lazarev et al., JINR Report E7-93-57, Dubna (1993) p.203.Yu.A. Lazarev et al., JINR Report E7-93-57, Dubna (1993) p.203. Yu.A. Lazarev et al., JINR Report P13-97-238, Dubna, 1997.Yu.A. Lazarev et al., JINR Report P13-97-238, Dubna, 1997. Yu.S. Tsyganov et al., Nucl. Instrum. Methods Phys. Res. A 392, 197 (1997).Yu.S. Tsyganov et al., Nucl. Instrum. Methods Phys. Res. A 392, 197 (1997). I. Muntian, Z. Patyk and A. Sobiczewski, Acta Phys. Pol. B 32, 691 (2001); R Smolańczuk, Phys. Rev. C 56, 812 (1997); R. Smolańczuk and A. Sobiczewski, in Proceedings of XV Nuclear Physics Divisional Conference “Low Energy Nuclear Dynamics”, St. Petersburg, Russia, 1995, World Scientific, Singapore, p. 313.I. Muntian, Z. Patyk and A. Sobiczewski, Acta Phys. Pol. B 32, 691 (2001); R Smolańczuk, Phys. Rev. C 56, 812 (1997); R. Smolańczuk and A. Sobiczewski, in Proceedings of XV Nuclear Physics Divisional Conference “Low Energy Nuclear Dynamics”, St. Petersburg, Russia, 1995, World Scientific, Singapore, p. 313. Yu.A. Lazarev et al., in Proceedings of the International School-Seminar on Heavy Ion Physics, Dubna, Russia, 1993, Report E7-93-274 (JINR, Dubna, 1993) Vol. 2, p. 497.Yu.A. Lazarev et al., in Proceedings of the International School-Seminar on Heavy Ion Physics, Dubna, Russia, 1993, Report E7-93-274 (JINR, Dubna, 1993) Vol. 2, p. 497. Yu.Ts. Oganessian et al., in Proceedings of the 4th International Conference on Dynamical Aspects of Nuclear Fission, Častá-Papiernička, Slovak Republic, 1998, World Scientific, Singapore, 2000, p. 334.Yu.Ts. Oganessian et al., in Proceedings of the 4th International Conference on Dynamical Aspects of Nuclear Fission, Častá-Papiernička, Slovak Republic, 1998, World Scientific, Singapore, 2000, p. 334. K. Subotic et al., Nucl. Instrum. Methods Phys. Res. A 481, 71 (2002).K. Subotic et al., Nucl. Instrum. Methods Phys. Res. A 481, 71 (2002). V.G. Subbotin, A.N. Kuznetsov, JINR Report 13-83-67, Dubna, 1983.V.G. Subbotin, A.N. Kuznetsov, JINR Report 13-83-67, Dubna, 1983. V.A. Antukhov et al., JINR Report P10-90-589, Dubna (1990) p.20.V.A. Antukhov et al., JINR Report P10-90-589, Dubna (1990) p.20. V.G. Subbotin, A.N. Kuznetsov, JINR Report 13-12953, Dubna, 1979.V.G. Subbotin, A.N. Kuznetsov, JINR Report 13-12953, Dubna, 1979. A.N. Kuznetsov, JINR Report P13-87-188, Dubna, 1987.A.N. Kuznetsov, JINR Report P13-87-188, Dubna, 1987. N.I. Zhuravlev et al., JINR Report 10-8754, Dubna (1975) p.18.N.I. Zhuravlev et al., JINR Report 10-8754, Dubna (1975) p.18. A.M.Sukhov et al., JINR Report P13-96-371, Dubna, 1996.A.M.Sukhov et al., JINR Report P13-96-371, Dubna, 1996. N.I. Zhuravlev et al., JINR Report P10-88-937, Dubna, 1988.N.I. Zhuravlev et al., JINR Report P10-88-937, Dubna, 1988. N.I. Zhuravlev et al., JINR Report 10-8114, Dubna (1988) p.14.N.I. Zhuravlev et al., JINR Report 10-8114, Dubna (1988) p.14. Yu.S. Tsyganov, A.N. Polyakov, Nucl. Instr. and Meth. in Phys. Res. A 558, (2006) 329-332; A 573 (2007) 161; A 513 (2003) 413; Appl. Radiat. And Isotopes, v.47, no.4, (1996) 451.Yu.S. Tsyganov, A.N. Polyakov, Nucl. Instr. and Meth. in Phys. Res. A 558, (2006) 329-332; A 573 (2007) 161; A 513 (2003) 413; Appl. Radiat. And Isotopes, v.47, no.4, (1996) 451. V.G. Subbotin, S.N. Iliev, A.A. Voinov, JINR Report P13-2004-97, Dubna, 2004.V.G. Subbotin, S.N. Iliev, A.A. Voinov, JINR Report P13-2004-97, Dubna, 2004. Yu.Ts. Oganessian et al., Phys. Rev. C 74, 044602 (2006).Yu.Ts. Oganessian et al., Phys. Rev. C 74, 044602 (2006). Yu.Ts. Oganessian et al., in Proceedings of the International Symposium on Physics of Unstable Nuclei “ISPUN07, Hoi An, Vietnam, 2007, World Scientific, Singapore, to be published.Yu.Ts. Oganessian et al., in Proceedings of the International Symposium on Physics of Unstable Nuclei “ISPUN07, Hoi An, Vietnam, 2007, World Scientific, Singapore, to be published.

12. XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.