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Research on Relativistic Heavy and Light Ion Physics. Experiments at the Nuclotron

• Continuation of experiments with the internal target at the Nuclotron. Preparation and carrying out of experiments with extracted beams at the Nuclotron. Development of the software for modeling and processing experimental data.
  
  
• Data taking and processing at the experimental set ups NA49 (CERN). Participation in realization NA61 project and operation of TOF system for this experiment.
  
  
• Participation in data analysis of the experimental data dp (1.25 GeV) and pp (3.5 GeV) with HADES spectrometer. Participation in data taking and analysis of AuAu (1.25 GeV) data. Development of new geseous detectors based on GEM structures. Participation in the development of physics program on FAIR (SIS100).
  
  
• Obtaining the new experimental data on the nuclear multifragmentaion induced by the relativistic light ions (studies are performed by means 4 device FASA-3) on the external beam of Nuclotron. Theoretical analysis of the data with the aim to clarify the mechanism of this process and to get the information on the nuclear phase transition ("liquid-fog" and "liquid-gas"). Obtaining a new data for fragment-fragment correlations in respect to relative velosity and relative angle. The model analysis of the data with the aim to estimate the time scale of the expansion process of hot nuclei.
  
  
• Study of multiparticle dynamics in terms of masses and energies of colliding objects and centrality of interaction. Mathematical modeling of experiments on investigation of the properties of highly excited states of nuclear matter in relativistic nuclear collisions and the mechanism of quark hadronization in the process of pion pair production.
  
  
• Search for eta-mesic nuclei formed in pA collisions, the determination of the total cross section of eta-nucleus production in pA collisions and its energy and A-depedence, the construction and production of the neutron detector for this experiment.
  
  
• Analysis of 7-prong events in np-interactions using data given an exposure of the 1m H₂ bubble chamber (HBC) of the VBLHEP (JINR) to a quasimonochromatic neutron beam with P_n=5.20 GeV/c with the purpose to in vestigate 7-quark resonances in the ^{++ + +} system.
  An investigation of the mechanizm of an appearance of 0-mesons with m < 1 GeV/c ² in the np np ^{+ -} reaction. Investigation of excharging process np pn in quasimonochromatic neutron beams at momenta 1.25, 1.43, 1.73, 2.25, and 5.20 GeV/c. Study of -quant spectra in np-interactions at P_n=5.20 GeV/c.
  
  
• Search and research of stable dibarions at the Nuclotron.
  
  
• Processing of emulsions irradiated with the nuclear beams ⁷Be , ¹¹B, ¹⁴N, ⁹Be, ⁹C,⁸B. Irradiation of emulsions with secondary beams of radioactive B and C isotopes.
  
  
• Study of nuclear interactions depending on projectile mass and energy with the beams of relativistic nuclei at the Nuclotron and other accelerators with the photo-emulsion method. Study of fragmentation, multifragmentation, multiparticle production together with correlations between them at interaction of nuclei of various energies with photo-emulsion nuclei. Search for collective effects in central nuclear-nuclear collisions in photo-emulsions. Development of the project on further emulsion irradiation with beams of light radioactive nuclei and heavy ions.
  
  
• Investigation of the deuteron spin dichroism.
  
  
• Creation of data base and program package for analysis of data obtained using bubble chambers and fixed target electronic experiments with registration of multiple particle production (project EDBIZ). Development of educational programs and techniques in the field of nuclear and elementary particle physics.
  
  

List of Activities
	Activity or Experiment	Leader	Status
	Laboratory	Responsible       person	Leading Researchers and number of participants
1.	HADES	A.I. Malakhov Yu.V. Zanevsky	Data taking Data analysis
	VBLHEP		O.V. Fateev S.P. Chernenko C.V. Razin V.P. Ladygin + 3 pers. G.N. Agakishiev V.N. Pechenov A.V. Belyaev A.P. Ierusalimov A.Yu. Troyan
	BLTP		V.D. Toneev
	DLNP		G.I. Lykasov
2.	NA49/NA61	A.I. Malakhov G.L. Melkumov	Data taking Preparation Data analysis
	VBLPHE		N. Agagabyan B. Baatar A.Yu. Isypov V.I. Kolesnikov M.A. Kozhin
	BLTP		A.S. Sorin
3.	BECQUEREL	P.I. Zarubin	Preparation Data taking
	VBLHEP		Yu.S. Anisimov + 2 pers. V. Bradnova + 4 pers. P.A. Rukoyatkin V.V. Rusakova + 6 pers.
4.	FASA-3	V.A. Karnaukhov	Data taking
	DLNP		V.A. Karnaukhov + 7 pers.
5.	Search for and study of --mesic nuclei in pA collisions at the JINR VBLHEP Nuclotron	G.A. Sokol S.V. Afanasiev	Preparation Data taking Upgrade
	VBLHEP		Yu.S. Anisimov + 2 pers. V.I. Ivanov A.S. Artemov A.F. Elishev D.M. Zhomurodov A.Yu. Isypov Z.A. Igamkulov D.K. Dryablov E.B. Plekhanov
6.	Investigation of the deuteron spin dichroism	L.N. Zolin	Data taking
	VBLHEP		A.G. Litvinenko + 5 pers. P.A. Rukoyatkin + 3 pers.
7.	Search and investigation of new phenomena using informa- tion obtained with bubble chambers and their theoretical interpretation. Creation of data base of experimental data and educational programs in the field of relativistic nuclear physics (EDBIZ)	A.A. Baldin V.V. Glagolev Yu.A. Troyan	Data analysis
	VBLHEP		A.V. Belyaev V.I. Moroz + 2 pers. E.B. Plekhanov A.Yu. Troyan A.P. Ierusalimov O.V. Arakelyan P.Zh. Aslanyan + 4 pers. O.V. Rogachevsky S.G. Stetsenko
8.	Investigation of deep subthreshold processes, applied and educational programs at MARUSYA set up	A.A. Baldin	Preparation Data taking
	VBLHEP		V.A. Arefiev P.Zh. Aslanyan + 2 pers. B.N. Guskov + 1 pers. M.G. Kadykov + 1 pers. K.V. Mikhaylov E.B. Plekhanov I.V. Slepnev + 4 pers. S.G. Stetsenko Yu.A. Troyan + 2 pers. A.V. Shabunov S.S. Shimansky I.P. Yudin E.E. Perepelkin I.G. Voloshina T.V. Shavrina
	BLTP		V.V. Burov + 3 pers.

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