Abstract-13:
----------------
The cross sections for small-angle proton elastic scattering on the ^6,8,9,11Li nuclei at the energies near 700 MeV/u were measured in inverse kinematics using secondary beams at GSI, Darmstadt. The hydrogen-filled ionization chamber IKAR was utilized as a target and a recoil proton detector. To determine the nuclear matter radii and radial matter distributions, the measured cross sections have been analysed with the aid of Glauber multiple-scattering theory. The nuclear matter distribution deduced for ¹¹Li exhibits a very pronounced halo structure. The obtained data allow for a test of theoretical model calculations on the structure of the studied neutron-rich nuclei.
E-mail: dobrov@pnpi.spb.ru

Abstract-12:
----------------
Differential cross sections of reaction p ^-p®p⁰n are measured for forward scattering angles. The experiment is carried out at the pion channel of the PNPI synchrocyclotron in Gatchina in the incident pions momentum range from 417 to 710 MeV/c. Measurements were made using PNPI p⁰-spectrometer by detecting both photons from the decay p⁰ ® 2 γ.
E-mail: dair@pnpi.spb.ru

Abstract-11:
----------------
Overview of current status of Relativistic Heavy Ion Collider (RHIC) and experimental setup of the PHENIX experiment is given. Plans of the PHENIX experiment upgrade up to year 2008 are presented. Physical program of the experiment and possibilities of its implementation are discussed. Performance of the PHENIX experiment during the RUN-4 is overviewed. Some physical results obtained in PHENIX experiment during the last year are presented: 1) measurement of transverse momentum spectra for charged hadrons and neutral p⁰ – mesons in dAu and AuAu at sqrt(s) = 200 ГэВ; 2) jet production in pp, dAu and AuAu interactions; 3) measurement of direct photons from the region of nuclear interaction as a function of transverse momentum and centrality in AuAu interactions; 4) production of J/Ψ in pp, dAu and AuAu interaction; 5) production of vector mesons (ω, φ) decaying in e⁺e^- channel. Basic directions of participation of PNPI in the PHENIX experiment are outlined. First results on measurement of light vector mesons decaying in hadron channels containing p⁰ – мезоны in final state are shown. Possibility to measure such decays in pp and dAu interactions is demonstrated. Further steps needed for continuation of this analysis are discussed.
( See: Present1.zip or Present1.pdf ).
E-mail: riabovvg@pnpi.spb.ru

Abstract-10:
----------------
Internal polarized gas target with atomic hydrogen and deuterium are widely used now in the accelerator storage rings. These targets have the density up to 10 ¹⁴ at / cm and some advantages (no radiation damages, single type of nuclear) in comparison with the polarized solid targets. Low density is compensated by the multiple beam interaction with the target. These targets are based on the polarized atomic beam sources, which produce the parallel beam of the nuclear polarized atoms (hydrogen or deuterium) with the thermal energies. Atomic beam reaches the interaction area and crosses the accelerated beam. A t-shaped tube (storage cell) is used for the density increasing. Since the source of polarized atoms provides almost completely polarized beam, the target polarization and density is restricted mainly by the depolarization in the cell. There are some experimental results confirming the existence of the nuclear polarization in the hydrogen or deuterium molecules produced by recombination of the polarized atoms. The first experimental result has been obtained as a by-product during the measurements with the polarized atomic targets at the accelerators. Systematic studies of the molecular polarization at the accelerators are limited by the high cost of the accelerator time. A presented laboratory setup gives a possibility of the systematic measurements of nuclear polarization in hydrogen and deuterium molecules at different conditions. Polarized atomic beam emerges from atomic beam source (FZ-Juelich, COSY collaboration) recombines into molecules in the storage cell. An electron beam passing through the cell produces the ions H⁺₂ and H⁺. In the special ion analyzer and Lamb-shift polarimeter (Koln University) the nuclear polarization could be analyzed separately for atoms and molecules. This enables the investigation of atomic recombination and molecular depolarization processes at different conditions. The final goal of these studies is a significant increase of the polarized target density.
E-mail: vassilie@pnpi.spb.ru

Abstract-9:
----------------
The production of eta - meson on nuclei is still a very active field of research lying in intersection of hadron and nuclear physics. A brief summary of the present status of this problem is presented. Nowadays due to new precise experimental data obtained mainly by TAPS&MAMI collaboration on this problem attracts theoretical efforts in many laboratories. Nevertheless the results obtained by different groups are in contradiction. So even the real part of scattering length of eta-mesons varies from 0.27 to 0.95 fm. A possible consequence of this attractive interaction is the formation of a bound-eta state for nuclei with a mass number larger than A>11. Now there are no reliable evidences about the existences of eta-mesic nuclei. The experimental confirmation of this bound system is of great interest in nuclear and particle physics for using nuclei as laboratories for studying the eta - mesons and the eta-N interaction in the nuclear field. Medium modification is one of the most discussed problems of modern physics. To find clear evidence for real influence of the nuclear potential on the physical processes is a main interest of many physical programs. The eta - meson production on nuclei provides a unique opportunity to study the interaction of the short-lived eta - meson with nucleons in a nuclear potential. As was mentioned in many reports the new precise data especially from full kinematics experiments are strongly needed for further progress in this field. The new experimental set on base of two famous sophisticated detectors -- Crystal Ball and TAPS -- is under installation on the tagged gamma- beam of MAMI accelerator. The combination of new experimental set and high energy resolution of primary beam produces the new opportunity in experimental study of meson - nuclei interaction. The new experiments with the aim to study low-energy interaction of eta-mesons with nuclei and search for eta-mesic nuclei are proposed. We propose to study a strong final state interaction of a slow eta-mesons produced by gamma beam on nuclei and search for eta-nuclei bound state in full kinematics experiments. Nowadays such experimental date do not exist. The details of experiments are presented.
E-mail: bekrenev@pnpi.spb.ru

Abstract-7:
----------------
Any measured before now angular correlation spectrum of coincident fission fragments of heavy nuclei at the incident proton energy 140 MeV ≤ E_p ≤ 1000 MeV is found to be approximated by a sum of two normal distributions. Their mean angles and standard deviations differ from each other 2-3 times as match and depend from the proton energy and the target nucleus mass rather smooth. The partial distributions may be associated with two fission channels. The cross section of the ordinary fission channel for actinides decreases, when the energy of incident protons increasing from ?? 50 MeV to 1000 MeV. The additional fission channel is open in the interval from 100 to 140 MeV, and this cross section increases to some hundred mb for actinides nuclei, when projectile energy increasing to 1 GeV. The additional channel dominates in the fission of ¹⁸⁴W nuclei by 1 GeV protons (? 83% of the total fission cross section). The high priority of the additional fission channel may be connected with a more effective mechanism of the partial transformation of the incident-proton-kinetic-energy into residual-nucleus-deformation-energy, corresponding to the fission barrier saddle point, than in the ordinary fission channel. The residual nucleus deformation arises from directional nucleon flows in the course of reactions of production-and-absorption of p-mesons and quasi-elastic scattering of incident protons on small angles at the fast stage of interaction.
E-mail:chestnov@pnpi.spb.ru

Abstract-6:
----------------
The appearance of the fermion condensation, which can be compared to the Bose-Einstein condensation, in different liquids is considered, its properties are discussed, and a large number of experimental evidences in favor of the existence of the fermion condensate is presented. A theory of high temperature superconductivity based on the combination of the fermion-condensation quantum phase transition and the conventional theory of superconductivity is presented.
E-mail:vrshag@thd.pnpi.spb.ru

Abstract-5:
----------------
Resonant Ramsey’s method for measurement Р-, Т-violating amplitudes of interaction of the polarized neutrons with the polarized nucleus in area р-a wave resonance is discussed.
Necessary expressions for the specified analysis are obtained on the basis of a formalism of a spin density matrix of neutrons.
It is shown that a neutron phase spectrum contains information about the efficient fields in the target. Analysis for a selection of T – odd amplitude is applied for proposed experimental scheme.
E-mail: lukasche@pnpi.spb.ru,   aldu@pnpi.spb.ru

Abstract-4:
----------------
Contemporary spectroscopic methods require the presentation of nuclear reaction products in the form of high quality low energy beam. To produce such ions we need to thermalize a product in a media and then extract it in an ionized form. The application of solid catchers (ISOLDE, IRIS …) puts the limits which come from the necessity of diffusion in solid and consiquentive ionization.
Nuclear reaction products stopped in a gas media does not need to be diffused out and ionized (IGISOL). During the slow-down process, the charge of an ion is decreased to 1e. The stopped ions are evacuates in vacuum with gas flow and electric field.
With the sample of Ion Guide ion sources the processes linked with transport of ions in dense (0.1-1bar) gas media in the presence of ionizing radiation and electric field to be discussed. The way to shape the electric field by electric cloud is considered. The calculations results are compared with the data obtained with IGISOL (JYFL) installation.
( See Seminar_PNPI_Jan_2004.pdf or Seminar_PNPI_Jan_2004.ppt )
For more details see:

• J. Huikari, P. Dendooven, A. Jokinen, A. Nieminen, H. Penttila, K. Perajarvi, A. Popov, S. Rinta-Antila, J. Aysto. "Production rates of radioactive ions at IGISOL" Submitted to Nucl.Instr.and Meth. Phys Res. B
• JYFL Annual Report 2002, p9.
• V.A.Bolshakov, A.G.Dernyatin, K.A.Mezilev, Yu.N.Novikov, A.G.Polyakov, A.V.Popov, Yu.Ya.Sergeev, V.I.Tikhonov. The Production of Neutron-Rich Heavy Nuclei of Astrophysical Interest at the IRIS Facility Nucl. Instrum. Methods Phys. Res. B70, 69 (1992).

Abstract-3:
----------------
The efforts directed to the search for new states in dimuon channel in ppbar collisions at 2 TeV collider will discuss. The idea to use the different signal and background polarization to increase sensitivity in the dimuon invariant mass spectra have proposed. The mass spectra in the region of invariant mass from 3 to 15 GeV and R.M.S. functions for the muon cos(theta) distributions in the dimuon rest frame are presented. Some possible indications to the existence of new states in the mass region of Psi and Upsilons mesons have been demonstrated. The possibility of search for B - mesons rare decays in the dimuon channel will be consider. ( See Search1.ppt )
E-mail: scheglov@pnpi.spb.ru

Abstract-2:
----------------
The detailed investigation of the reaction pp-->pp p⁰ ( proton + proton --> proton + proton + pion ) has been carried out at two incident proton momenta. Momentum, angular and effective mass distributions were analyzed in the framework of the one-pion exchange model. Taking into account only the P33 wave in the pole diagrams allows one to obtain the rather good agreement with experimental data on differential distributions. At the same time the predictions for total cross sections are much lower than the experimental data.
E-mail: Saran@pnpi.spb.ru

Abstract-1:
----------------
The laser ion source has been used for the study of the isotope shifts of neutron deficient Eu isotopes. The extension of the region of the applicability of the method by using the g - b - radiation detection is reported. We have measured the isotope shifts of the europium optical line 576.520 nm for ^137-144 Eu. To increase the laser ion source efficiency an axial magnetic field was applied. Due to the axial magnetic field application the produced ions were extracted more efficiently from the ion source cavity. Nearly twofold rise of europium atom ionization efficiency was observed. By using of the effect of optical ion bunching the increase of selectivity was obtained. The isotope shift data for ^139-144Eu are in keeping with the previously measured isotope shifts for these nuclides. The new data for ¹³⁷ Eu and refined data for ¹³⁸Eu point to the gradual increase of deformation for these isotopes. Comparison with the microscopic-macroscopic calculations and calculations in the framework of Hartree-Fock model have been made.
E-mail: dfedorov@pnpi.spb.ru