Development of FLINT experiment

Konstantin Mikhailov for FLINT collaboration

ITEP

24 November 2011

The Session-conference of Nuclear Physics Division ofRussian Academy of Sciences "Physics of Fundamental Interactions" (ITEP, Nov, 2011)

The idea of FLINT experimentPhase 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

The idea of FLINT (FLucton INTeraction)

K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 3

Phase diagram* Scheme of process

А2

Fluctons

Dense baryon system

А1

*http://www.gsi.de/forschung/fair_experiments/CBM/

NICA MPD

ITEP FLINT

FLINT Setup

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FLINT Setup

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Runs 2007 2010 2011

EC channels ~50 124 124

Reaction C+Be C+Be C+Be

EKin, AGeV 3.2 2, 3.2, 4 3.2

Intensity, ions/spill ~107 ~2*108 ~2*108

Exposition 1 day 20 days 10 days

Trigger 1 GeV Different Diffferent

Data 750 k 10 M 5 M

Data quality cuts

K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 6

Three groups of cuts: Spill Hit Multiplicity Signal shape

Data quality cuts

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Photon spectra CBe→γX 3.2 AGeV

K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 8

FLINT Preliminary

Photon spectra 2.0 AGeV

K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 9

FLINT Preliminary

K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 10

Slope vs angle 12C+9Be→γ+X

FLINT Preliminary

Θ [degrees]

E 0 [G

eV]

1/p dN/dE fitted by Const*exp(-E/E0)

K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 11

Spectrum vs cumulative number

1/p dN/dE fitted by const*exp(-X/X0)

T/A=2.0 GeVT/A=3.2 GeV

Θ=35-53O Θ=35-53O

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Kinematical Boundaries

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Data and UrQMD

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Development of FLINT setup

V

T

N2

ToF

EC1

M1

N1

EC2

M2

Chambers

EC-electromagnetic calorimetersN-neutron detectorsM-magnets V-vertex detector

6m

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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 π0+6N system• Pπ0= P6N according to reaction 3N+3N→π0+6N at the same T/A

• momentum of each nucleon in π0+6N system is smeared with a parameter σsmear: σx=σy=σz=σsmear=340 MeV/c • Background is selected UrQMD event w/o 6 nucleon system• Signal is new 6N

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 GeV S/B2.0 ~ 33.2 ~ 54.0 ~ 7

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

Extra slides

Example of signal

maximum

Tail

Front

Pedestal

Post Pedestal

C+Be->gamma+X

T/A=3.2 GeV

Kinematical Boundaries

K.Mikhailov The session-conference RAS, ITEP, 24 November 2011 21

Kinematical Boundaries 3.2AGeV

NeutronDetector

PC2

PC1

TOF2

TOF1

DCM detector(project)

ECal

Magnet Neutrons detectorChambers

ToF

VETO

Vertex detector

TargetBeam

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

New ITEP experimental hall

FLIN

T

FLINT supermodule