BeCQueRel Collaboration - Presentation
The BECQUEREL international collaboration is destined to continue irradiation of emulsion in newly produced beams at the JINR Nucloton from Dubna with the purpose of studying in detail processes of fragmentation of light radioactive nuclei. The expected results would make it possible to answer some topical questions concerning the cluster structure of light radioactive nuclei by studying both diffractive dissociation process and radioactive nuclei fragmentation. Thanks to the best spatial resolution, the nuclear emulsions would enable one to obtain unique results along these lines. The advantages to use the Nuclotron are: a limiting fragmentation regime, reactions take the shortest time, projectile nucleus fragments are collimated mostly in a narrow solid angle and ionization losses of projectile fragments correspond to the minimum.
The experimental study of the projectile fragmentation is essentially both for extend knowledge in domain of heavy ion interactions and to extract the information about properties of matter under extreme conditions. Irradiations will be performed in the secondary beams of He, Be, B, C and N radioactive nuclei formed on the basis of Nuclotron's primary beams of stable nuclei. This project combines efforts of a number of teams of possessing scanning and measuring devices (microscopes) and emulsion processing equipments. This collaboration owns unique information and experience in processing experimental information on the interactions of light nuclei obtained in Dubna and that for heavy nuclei at energies obtainable in BNL and CERN (former EMU Collaboration). The results on the coherent dissociation of Li, C, O, Mg, and S nuclei obtained by this method are now of special interest since they open new possibilities in understanding the topical problems of the structure of nuclei.
The advantages taken from the use of Nuclotron's beams consist in that a limiting fragmentation is set in, the reaction takes shortest time, fragmentation products are collimated in a narrow angle cone, and ionization losses of the reaction products are minimum. The emulsions are especially helpful in the study with neutron deficit nuclei. It is especially interesting to search for proofs that there exists a proton halo for radioactive nuclei like 8B. The latter is very important in astrophysical processes of nuclear synthesis. It is just this area of investigations seems to be most urgent in the coming years.