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Investigation of direct nuclear reactions induced by light neutron rich nuclei.

Grant number: 14/02116-9
Support Opportunities:Scholarships in Brazil - Post-Doctorate
Effective date (Start): August 01, 2014
Effective date (End): May 31, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics - Nuclear Physics
Principal Investigator:Edilson Crema
Grantee:Yanyun Yang
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The proposal of this project is to investigate the structure of light neutron-rich nuclei by measuring elastic scattering and breakup reactions. Neutron-rich light nuclei, such as 6,8He, 8,9,11Li, 11Be and 15C, are radioactive nuclei with lifetime around tens to hundreds of milliseconds. Some of these nuclei exhibit exotic properties such as halo structure and are, thus, called exotic nuclei. Despite their short lifetimes, it is now possible to produce beams with these radioactive nuclei. We can now study their structure and nuclear properties with direct reactions such as elastic scattering, inelastic, transfer and break up, induced by these beams. Elastic scattering and breakup reactions are powerful tools to investigate the structure of these nuclei. The description of these processes is very sensitive to the interaction potential between the projectile and target nuclei and the structure of the nuclei involved in the collision. Thus, various information such as radius, density, cluster configuration, coupling to the continuum through the coupling of the breakup channel can be investigated. From the point of view of astrophysics, neutron-rich light nuclei have a decisive role in the evolution of many astrophysical sites. Thus, understanding the effects of the structure of these nuclei in direct reactions and total reaction cross section can also bring important information to the understanding of these astrophysical processes. The main motivation of this proposal is to investigate halo behavior of two neutron-rich nuclei, 11Be and 15C, by measuring angular distributions for the elastic scattering and breakup process on intermediate and heavy mass target. For this we are proposing to perform three experiments.1 ) Measurement of angular distributions in 3 energies above the Coulomb barrier for the elastic scattering of 15C on 58Ni target. The idea of these measurements is to investigate the halo structure of the 15C nucleus. This measurement will be performed with 15C secondary radioactive beam to be produced with RIBRAS system (Radioactive Ion Beams in Brazil) installed at the Instituto de Física da USP.2 ) Measurement of angular distribution for the breakup process of the 15C (14C+n) on the 58Ni target. This measurement will also be performed with 15C to be produced with RIBRAS system in Sao Paulo. We will detect the 14C fragment in coincidence with the neutrons, where the neutrons will be detected with the neutron wall available in the laboratory.3 ) Measurement of angular distributions for the elastic scattering of 11Be in 208Pb target at energies 3 to 6 times the Coulomb barrier. These measurements will be carried out with the Radioactive Ion Beam Line in Lanzhou (RIBLL) in the Heavy Ion Research Facility in Lanzhou, China (HIRFL). The idea is to investigate the effect of the well established halo structure of 11Be in the elastic scattering at high energies.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SCARDUELLI, V.; CREMA, E.; GUIMARAES, V.; ABRIOLA, D.; ARAZI, A.; DE BARBARA, E.; CAPURRO, O. A.; CARDONA, M. A.; GALLARDO, J.; HOJMAN, D.; et al. Elastic and inelastic scattering for the B-10+Ni-58 system at near-barrier energies. Physical Review C, v. 96, n. 5, . (14/02116-9, 16/02863-4)

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