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Study of Multiple Production in 4-geometry. 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) and PHENIX (BNL).
  
  
• Processing of experimental data on investigation of A_t dependence of cross sections of deuteron fragmentation into pions in twice cumulative region, study of analyzing power A_z.
  
  
• Trial run of the spectrometer with proportional chambers at the channel 4B for measuring lifetime of light hypernuclei ⁴H and ³H. Study of the interaction region of Mg - Mg nuclei. Study of ionization parameters of tracks in streamer chamber.
  
  
• Measurement of tensor and vector analyzing powers of the reaction + A p, + X in the cumulative region.
  
  
• Obtaining the new experimental data on the nuclear multifragmentaion induced by the relativistic light ions (studies are performed by means 4 device FASA-2) 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 detectorfor the SCAN spectrometer.
  
  
• Analysis of 7-prong events in np-interactions using data given an exposure of the 1m H₂ bubble chamber (HBC) of the VBLHE (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. A further investigation of 5-quark resonances in the ^{++ +}( ^{- -}) system in the np p ^{+ + - -}n reaction. 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, appearancing in np-interactions at P_n=5.20 GeV/c with the purpose of searching of radiactive decays of 0-mesons. Acreation of the np-exchange data bank for the sourch neutrons momenta range from 1.25 to 5.20 GeV/c.
  
  
• Development of the project on experimental search of stable dibarions at the Nuclotron. Search and study of stable dibaryons with strangeness S=-2 in pC collisions at 10 GeV/c.
  
  
• The experimental results on investigation of spin effects at production of neutral mesons in collisions of polarized nucleons at the energies 1.2-1.5 GeV for transversal polarization of beam and target particles. First results on angular distributions of pion production in pA and dA collisions in the energy region of a narrow resonance structure of the reaction excitation function ( 350 MeV/nucleon) for aluminum, copper and silver nuclei.
  
  
• Study of angular behavior of analyzing power A_z in the reactions + A { d', p, }+ X.
  
  
• Measurement of cross section of the reaction d + A p, (0 ^o) + X as a function of atomic mass in twice cumulative region
  
  
• Study of neutron generation and multiplication in heavy targets (Pb, W, etc.) at the proton beam of the Nuclotron. Data on energy release, neutron spectra, fission and radiation absorption in the model. Study of cross sections of transmutation of radioactive wastes. Irradiation of heavy element samples by direct proton and deuteron beams. Reconstruction of neutron spectra. Determination of cross sections of transmutation of long-lived radioactive wastes of nuclear power reactors. Analysis of data base of constants necessary to create prototypes of electro-nuclear installations.
  
  
• Processing of experimental data on the reactions dd³Hen and dd³H p in order to obtain information on spin structure of ³He and tritium up to internal momenta about 600 MeV/c.
  
  
• Preparation of the experiment pHe3 at the extracted deuteron beam of 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.
  
  
• Measurement of the quasielastic analyzing power A(,u) of proton-nucleus scattering in the reactions d + A p_L + p + X and d + A p_L + p + n + X at the extracted beam of the Nuclotron and model-theoretical analysis of the obtained data.
  
  
• Investigation of A-depedence of the analyzing power reduction at A = H, D, Be, C, Cu, Pb.
  
  

List of projects:
	Project	Leader	Priority (period of realisation)
1.	GIBS	J. Lukstins	1   (1997 - 2007)
2.	DELTA-2	V.A. Krasnov	1   (2003 - 2009)
3.	NA49	G.L. Melkumov	1   (1999 - 2008)
4.	LNS	V.P. Ladygin	1   (2001 - 2009)
5.	pHe3	A.I. Malakhov V.P. Ladygin	1   (1996 - 2008)
6.	PHENIX	A.G. Litvinenko	1   (2002 - 2008)
7.	BECQUEREL	P.I. Zarubin	1   (2002 - 2008)
8.	-nuclei	A.I. Malakhov G.A. Sokol	1   (2005 - 2007)
9.	"Leading Particles"	A.A. Yershov	2   (2000 - 2007)

List of Activities
	Activity or Experiment	Leader	Status
1.	GIBS	J. Lukstins	Data taking
2.	NA49	A.I. Malakhov G.L. Melkumov	Data taking
3.	LNS	V.P. Ladygin	Preparation Data taking
4.	pHe3	A.I. Malakhov V.P. Ladygin T. Uesaka	Preparation
5.	PHENIX	A.G. Litvinenko	Data taking Data analysis Preparation
6.	--nuclei	A.I. Malakhov G.A. Sokol S.V. Afanasiev	Preparation Data taking
7.	DELTA-2	V.A. Krasnov A.B. Kurepin	Preparation Data taking
8.	BECQUERELI	P.I. Zarubin S. Vokal	Preparation Data taking
9.	SMS MSU	L.I. Sarycheva A.A. Yershov	Data taking

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