"Dead-time" reduction of the "Dead-time" reduction of the detection system of the Dubna detection system of the Dubna
Gas-filled Recoil SeparatorGas-filled Recoil Separator
V.G.Subbotin, Yu.S.Tsyganov, V.G.Subbotin, Yu.S.Tsyganov, A.A.VoinovA.A.Voinov, A.M.Sukhov, A.N.Polyakov, S.N.Iliev, A.M.Sukhov, A.N.Polyakov, S.N.Iliev
Joint Institute for Nuclear Research, 141980 Dubna, RussiaJoint Institute for Nuclear Research, 141980 Dubna, Russia
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
Layout of the Dubna gas-filled recoil separator (DQQ configuration)Layout of the Dubna gas-filled recoil separator (DQQ configuration)
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
Layout of the Dubna gas-filled recoil separator (DQQ configuration)Layout of the Dubna gas-filled recoil separator (DQQ configuration)
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
Si focal plane box of PIPS detectorsSi focal plane box of PIPS detectors
Particals’ signals: EVRs, alpha-, FFEfficiency• 87% of 4p for a-particles• 100% of 4p for FFResolution• 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
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 Block diagram of the measuring electronics (only one detector circuit is shown completely).completely).
5 6 7
98
1
1B1
1T14
6 7
6 7
4 76
3
3
2
2
Eff position
Ea и Eff energy
Eff energy
Ea и Erecoil position
Logic of registration1 E
1 - position-sensitive strips of Si detector.2 - charge-sensitive preamplifier micro Catsa.3 - sum-invert-amplifier SU-206K.4 - amplifier SU-4K.5 - amplifier ORTEC575.6 - analog multiplexer AM-206K.7 - ADC PA-24K.
Measuring CAMAC Crate
8 - analog discriminator of energies DF-202.9 - logical block KL-203 (to control all ADCs).10 - charge-sensitive preamplifier PA-201.11 - timing filter amplifier Polon 1501.12 - nanosecond delay Polon 1506.13 - constant fraction discriminator.14 - T/A converter Polon 1701A.
71413
131211
1110
10
TOF
"stop""start"
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 DGFRSDiagram of the logic of the registration of nuclear reactions products at DGFRS
TOF-chamber
"stop"
"start"
blocking ofTOFselect
DF-201
Еrecoil >Еthreshold
TOF
1 chip
2 chip
3 chip
side
coincidencen > 2
1
&
ALL SIGNALS
TOFselect
anticoin-cidence
1
&
(TOFselect)Х(DECAY)Х(DEAD-TIMEmain)Х(DEAD-TIMEadd)
TOFDECAY
MAJORITYCOINCIDENCES
to КР-005
deblocking of ADCmain
beginning of measurementin КС-011add
KL-203block
KL-033КК-202
Selected TOF
debloking of ADCadd
"+1" in КС-002main
Еrecoil >8 MeV
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 ADCsThe new logical block KL-203 to control the work of ADCs
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
SummarySummary
• The new logical block was designed and tested in the test reaction natYb+ 48Ca (for example,
220Th with T10 μs). “Dead-time” of the modern registration system is 8 s.
• In the experiment 249Cf+ 48Ca three decay chains originating from the parent isotope 294118
were detected (the half-lives of all the nuclei are longer than about 1 ms).
• Further investigation of the region of superheavy nuclei, e.g, nuclides with Z=120 in the
reaction 244Pu+ 58Fe definitely requires applying of this system because of the short half-lives
(~10-50 s) expected for the isotopes 298,299120.
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
Thank youThank you
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.
ReferencesReferences• 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.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.
• 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.
• 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.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.• A.N. Kuznetsov, JINR Report P13-87-188, Dubna, 1987.• 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.• 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.• 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.• 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.
XXI International Symposium on Nuclear Electronics and Computing. Bulgaria, Varna, 10-17 September, 2007.