Exotic Nuclei in South America
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Frequently Asked Questions (9)
Q2. What is the chemistry of the atom?
The weakly bound neutrons enhances the total reaction cross sections of those exotic nuclei and the possible presence of such rare isotopes in astrophysical sites like supernovas explosions and the BigBang nucleosynthesis could have consequences in the formation of the stable known elements.
Q3. What is the name of the RIBRAS?
RIBRAS is presently the only experimental equipment in South America capable of producing secondary beams of rare isotopes.
Q4. What is the primary beam and secondary target?
The 7Li of 35 MeV/A and a 9Be (~12µm) are the standard primary beam and primary target to produce 6He and 8Li secondary beams beams via the one proton stripping 9Be(7Li,6He) and one neutron pickup 9Be(7Li,8Li) reactions.
Q5. What is the purpose of the second solenoid?
A second identical solenoid is mounted after the target (7) and will allow an additional filtering improving the purity of the secondary beams.
Q6. What is the atomic structure of the RIBRAS?
It consists of two superconducting solenoids, presently installed in one of the beam lines of the 8 MV Pelletron Tandem accelerator of the University of São Paulo.
Q7. Why is the exotic nucleus weakly bound?
Due to the fact that the exotic nuclei are weakly bound, the breakup and the neutron transfer reactions become important channels even at energies below the Coulomb barrier, strongly coupled with the elastic channel.
Q8. What is the atomic structure of the nucleus?
Neutron rich nuclei like 6,8He present a cluster like structure formed by an alpha core and a “halo” of neutrons which extends over large distances from the core and with densities much lower than the normal nuclear matter.
Q9. What is the main topic of this article?
Another interesting field opened by the advent of exotic secondary beams is the spectroscopic study of nuclei out of the line of stability and its consequences in reactions of astrophysical interest.