jinr pac dubna 2002

JINR PAC DUBNA 2002

Research Program

One of the most compelling questions in modern Nuclear Physics is what role quark

and gluon degrees of freedom play in nuclear structure

and in the dynamic of nuclear matter!

What is possible contribution of the DISK project research program

to clarify this problem?

The goal of experiments at DISK spectrometer is study of cumulative particle

production.

Baldin,1971

Quark-parton structure function

Short-range multinuclon correlation

Hypothesis of “minimal economical interactions”

Smin=(X P +XI III PII)2

Subthreshold processes Cumulative

reactions

High-PT and Z-scaling

X= XIIIX +2 2 +2 XIXII

V.Stavinsky, 1981

Dynamic Correlation

Smin=(X P +XI III PII)2

XImI+XIImII m+(XImI+XIImII+m3)

<PN>~ mN(XImI+XIImII+mIII)

PM

<N>=390 <N>=730

<PN>=1.14Gev/c <PN>=0.82Gev/c

P, 500 Mev/c, 90o

Cumulation Correlation

R2(> 10)

Results of

Experiments in

1997-2001

JINR-Yerevan Physics Institute

Asymmetry of deuteron photodisintegration process by linearly polarized photons

ENERGY DEPENDENCE OF NUCLEAR TRANSPARENCY IN C(P, 2P) SCATTERING.

Phys.Rev.Lett.87:212301,2001

Experiments at AGS

Color Transparency

(EVA/E850 Collaboration)

Experiments at AGS(EVA/E850 Collaboration)

Backward emitted high-energy neutrons in hard reactions of p and + on carbon

Nucl-ex/00050006 28 may 2000

N-P Short Range Correlations from (P,2P + N) Measurements.

. AIP Conf.Proc.549:451-454,2002,

Submitted to Phys.Rev.Lett

Detector Upgrade

Cryogenic Targets

The high effective nonmagnetic spectrometers (10 spectrometers) based on organic and NaI(Tl) scintillators

needed for the registration of neutrons and photons are included in

the setup

Identification Methods

Neutron/Photon Separation by Pulse Shape Analysis (Detectors with Stylben Crystals)

ADC1 , hcan.

TDC , chan.

ADC , chan

ADC2 , chan.

ADC , chan

TDC , chan.

Charged Particle Separation by TOF-E Analysis (Detectors with Plastic Scintillators and NaJ(Tl) Crystals)

Neutron Spectra Obtained with Spectrometer

Trigger System development

Cooperation with Nuclear Physics Institute (Czech

Republic) on the design and manufacturing of the Silicon

Vertex Tracker.

Experimental program at NUCLOTRON in 2003-2005

FROM THE SUMMARY OF THE ROUND TABLE DISCUSSION AT VARNA

WORKSHOP’01

PHYSICAL PROBLEMS • Strangeness in light nuclei (deuterium, helium) and K-meson

asymmetry in the cumulative region.• Exclusive pD break-up reaction at high transverse momentum ,

spin asymmetry and color transparency.• The structure of relativistic compound systems.• Dynamic correlations in the cumulative production processes.• Fragmentation of polarized deuterons into cumulative mesons.

REQUIREMENTS TO THE NUCLOTRON Beams Intensity Spill duration Operating time in use

2002 p, d, d , 1010-107 1,0 s 2000 hours2003 p, d, d , 1011-109 5,0 s 2500 hours2004 p, d, d , 1011-107 10,0 s 3000 hours2005 p, d, d , 1011-107 10,0 s 3500 hours

Installation of Beam Detectors at Beam Line

of Nuclotron

Conclusion

Our request is to extend the project with the first priority for the

next 3 years and to provide a level of

the financial support not less

than it was in 2000-2002.