1. Development of FLINT experiment Konstantin Mikhailov for FLINT collaboration ITEP 24 November 2011 The Session-conference of Nuclear Physics Division of Russian Academy of Sciences "Physics of Fundamental Interactions" (ITEP, Nov, 2011)

2. The idea of FLINT experiment Phase diagram, process schema FLINT setup Current status of experiment New results Development of FLINT setup Conclusion Outline K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 2

3. The idea of FLINT (FLucton INTeraction) K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 3 Phase diagram* Scheme of process А2А2 Fluctons Dense baryon system А1А1 *http://www.gsi.de/forschung/fair_experiments/CBM/ NICA MPD ITEP FLINT

4. FLINT Setup K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 4

5. FLINT Setup K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 5 Runs200720102011 EC channels~50124 ReactionC+Be E Kin, AGeV3.22, 3.2, 43.2 Intensity, ions/spill ~10 7 ~2*10 8 Exposition1 day20 days10 days Trigger1 GeVDifferentDiffferent Data750 k10 M5 M

6. Data quality cuts K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 6 Three groups of cuts: Spill Hit Multiplicity Signal shape

7. Data quality cuts K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 7

8. Photon spectra CBe→γX 3.2 AGeV K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 8 FLINT Preliminary

9. Photon spectra 2.0 AGeV K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 9 FLINT Preliminary

10. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 10 Slope vs angle 12 C+ 9 Be→γ+X FLINT Preliminary Θ [degrees] E 0 [GeV] 1/p dN/dE fitted by Const*exp(-E/E 0 )

11. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 11 Spectrum vs cumulative number 1/p dN/dE fitted by const*exp(-X/X 0 ) T/A=2.0 GeV T/A=3.2 GeV Θ=35-53 O

12. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 12 Kinematical Boundaries

13. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 13 Data and UrQMD

14. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 14 Development of FLINT setup V T N2N2 ToF EC 1 M1M1 N1N1 EC 2 M2M2 Chambers EC-electromagnetic calorimeters N-neutron detectors M-magnets V-vertex detector 6m 4m

15. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 15 Background with UrQMD UrQMD: C+Be at T/A = 2.0, 3.2 and 4.0 GeV Select events with 6 (or more) nucleon-participants Require momentum sum of any 6N is less than 100 MeV/c Change these 6 nucleon system to π 0 +6N system P π0 = P 6N according to reaction 3N+3N→π 0 +6N at the same T/A momentum of each nucleon in π 0 +6N system is smeared with a parameter σ smear : σ x =σ y =σ z =σ smear =340 MeV/c Background is selected UrQMD event w/o 6 nucleon system Signal is new 6N

16. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 16 Signal to background T/A=2.0 T/A=3.2 T/A=4.0 Background Signal Signal+Backgrund T/A GeVS/B 2.0~ 3 3.2~ 5 4.0~ 7

17. Conclusions The acceptance of FLINT setup increased two times due to new super module New FLINT experimental results was presented Photon spectra in CBe→γX reaction at 2.0, 3.2 AGeV were measured with FLINT setup Spectra were fitted by exponential function The slope of the spectrum depends on the energy The slope of spectrum depends on theta angle for both energies Data confirm flucton-flucton interaction Development of FLINT setup and first estimation of S/B was presented

18. Extra slides

19. Example of signal Cut on the gate ft->Draw("en","pn[8]") //energy spectra when gate ON Cut on multiplicity (number of hits) [see previous meeting] hitsum5[0]<=4 /*green*/ Cut on maximum position [see previous meeting] FitMaxPos>23&&FitMaxPos<31 Cut on overflow in ADC !bAdcOverFlow Cut on the shape of signal Check front and tail of signal Cut on pedestal RMS Cut on «post pedestal» maximum Tail Front Pedestal Post Pedestal

20. C+Be->gamma+X T/A=3.2 GeV Kinematical Boundaries

21. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 21 Kinematical Boundaries 3.2AGeV

22. Neutron Detector PC2 PC1 TOF2 TOF1

23. DCM detector(project) ECal Magnet Neutrons detector Chambers ToF VETO Vertex detector Target Beam

24. K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 24 New ITEP experimental hall FLINT

25. FLINT supermodule