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Interaction of Intense Relativistic Beams with Matter

#2299


Experimental and Theoretical Research into the Basics of Intense Relativistic Beams – Matter Interaction

Tech Area / Field

  • PHY-ANU/Atomic and Nuclear Physics/Physics

Status
3 Approved without Funding

Registration date
31.08.2001

Leading Institute
Joint Institute of Nuclear Research, Russia, Moscow reg., Dubna

Supporting institutes

  • VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • CNRS, France, Paris

Project summary

The proposed project relates to basic physics research. The objective of the investigations is to obtain more precise knowledge on the basics of interaction of relativistic ion beams with inert and radioactive materials and nuclear reactions of a wide range of accelerated particles with targets in the conditions of total absorption of primary particles.

Lately the interest to investigation of the processes of relativistic nuclei - matter interaction has increased significantly. It is related to the development of new directions of theoretical research with nuclei of energies from hundreds of MeV/u to several GeV/u, and to the new experimental capabilities with intense ion beams in this energy range.

The creation of accelerators producing powerful beams of relativistic charged particles, inspires experimental research towards the solution of the problem of theoretical description of strong interaction of relativistic nuclei in the conditions when proton-neutron model of a nucleus is no more adequate, and quark-gluon degrees of freedom become important.

One of the promising directions of investigation of properties of nuclear matter is the study of fragmentation at interaction of relativistic protons and nuclei in the transition energy range (0.2-10 GeV/u) with nuclei.

The phenomenon of total disintegration of heavy nuclei into light fragments, accompanied by noticeable neutron yield, was observed in a number of experimental investigations. We began the investigation of total disintegration of Au nuclei under the impact of 150-1,500 MeV/u deuterons in the region below Coulomb threshold (energies of detected fragments less than 15 MeV).

These investigations started on internal targets of the accelerator complex Nuclotron at LHE, JINR. It should be noted that at present there is no adequate theory to describe such reactions, because it is very difficult to account for interference between strong and Coulomb interactions. With putting into operation the specialized superconducting nuclear accelerator Nuclotron the principally new capabilities for experimental investigation of multifragmentation and neutron yield both with thin internal targets, and with extracted beams using massive combined targets, appear.

The activity in the framework of the project includes experimental research with the Nuclotron beams and at the experimental stands. Computer modeling and theoretical analysis of available and newly obtained experimental results is proposed.

During the first stage of the project the following basic experimental data will be obtained:

– New experimental data on secondary particles and radiation with different projectile types and energies.

– Isotope composition of irradiated species will be studied with different projectile types and energies in the range 0.3-6 GeV/u.

– Experimental data on neutron yield from thick targets with different target designs (thickness and type of target material and moderator).

– Numerical data on the parameters of radioactive shield for experimental areas of powerful accelerators and characteristics of nuclear processes with primary and secondary particles and radiation fields in the shielding elements and surrounding regions.

– Measured total disintegration cross sections for heavy nuclei (up to U).

– Experimental information on optimal beam parameters (type, energy, etc.) for total disintegration.

– Measured cross sections of multi-particle nuclei-nuclei interactions in the energy range 1-6 GeV/u.

– Experimental information on the parameters of ion interaction with condensed matter.

– Electronic data base of the existing and newly obtained experimental data will be developed.


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