The Research Program at RIBRAS (Radioactive Ion Beams in Brasil)-III (original) (raw)
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We present a quick description of RIBRAS (Radioactive Ion beams in Brazil), which is a superconducting double solenoid system, installed at the Pelletron Laboratory of the University of São Paulo and extends the capabilities of the original Pelletron Tandem Accelerator of 8MV terminal voltage (8UD) by producing secondary beams of unstable nuclei. The experimental program of the RIBRAS covers the study of elastic and inelastic scattering with the objective to study the interaction potential and the reaction mechanisms between weakly bound (RIB) and halo ( 6 He and 8 B) projectiles on light, medium and heavy mass targets. With highly purified beams, the study of resonant elastic scattering and resonant transfer reactions, using inverse kinematics and thick targets, have also been included in our recent experimental program.
Scientific program of the Radioactive Ion Beams Facility in Brasil (RIBRAS)
Nuclear Physics A, 2010
The RIBRAS facility (Radioactive Ion Beams in Brasil) is installed in connection with the 8MV Pelletron tandem of the University of São Paulo Physics Institute. It consists of two superconducting solenoids which focalize light radioactive secondary beams of low energy, produced by transfer reactions. Recent experimental results include the elastic scattering and transfer reactions of 6 He halo nucleus on 9 Be, 27 Al, 51 V and 120 Sn targets. The elastic scattering and transfer of 8 Li and 7 Be on several targets is also being studied. The transfer reaction 8 Li(p,α) 5 He of astrophysical interest was also studied in the E cm =0.2-2.5 MeV energy range.
The scientific program with RIBRAS (radioactive ion beams in Brasil)
AIP Conference Proceedings, 2009
The Radioactive Ion Beams Facility (RIBRAS) is in operation since 2004 at the Pelletron Accelerator Laboratory of the University of São Paulo and consists of two superconducting solenoids capable of producing low energy secondary beams of light exotic nuclei. Measurements of the elastic scattering, breakup and transfer reactions with radioactive projectiles such as 6 He, 8 Li, 7 Be on several targets have been performed. A review of the research program carried on along the last four years using the RIBRAS facility is presented.
Low energy nuclear reactions with RIBRAS, Radioactive Ion Beam in Brasil, system
Journal of Physics: Conference Series, 2011
RIBRAS, Radioactive Ion beam in Brasil, is a system based on superconducting solenoids which can produce low energy RNB (Radioactive Nuclear Beams) at the University of São Paulo, Brazil. Secondary radioactive beams of light particles such as 6 He, 7 Be and 8 Li have been produced and low energy elastic scattering and transfer reaction experiments have been performed. The recent scientific program using this facility includes elastic scattering and transfer reactions of 6 He halo nucleus on 9 Be, 27 Al, 51 V and 120 Sn targets and 8 Li on 9 Be, 12 C and 51 V targets. The total reaction cross section as a function of energy has been extracted from the elastic scattering data and the role of breakup of weakly bound or exotic nuclei is discussed. Also spectroscopic factors have been obtained from the transfer reactions.
Recent results with radioactive ion beams in Brasil (RIBRAS)
2012
The RIBRAS facility (Radiactive Ion Beams in Brasil) is installed next to the 8 MV Pelletron Tandem of the Nuclear Physics Laboratory of the Institute of Physics of the University of São Paulo. It consists of two superconducting solenoids with maximum magnetic field of B=6.5T. Light radioactive ion beams are produced through transfer reactions, using solid or gaseous production targets of Be, LiF, 3 He etc. The solenoids make a magnetic rigidity selection and the use of the two solenoids with a degrader between them allows the production of quite pure secondary beams. Beams of 6 He, 8 Li, 7 Be, 10 Be, 8 B, 12 B are currently produced and used to study elastic, inelastic, and transfer reactions on a variety of light, medium mass and heavy secondary targets. Some examples of reactions recently studied are presented below.
Recent results from RIBRAS (Radioactive Ion Beams in Brasil)
Journal of Physics: Conference Series, 2019
An overview of the experiments performed at RIBRAS over the last year is presented. Elastic scattering and breakup reactions induced by light exotic projectiles on different targets have been measured and some results are presented here for the 120Sn(6He, α) reaction. Resonant scattering experiments have been performed with 10Be and 12C secondary beams on a CH2 thick target and the well known 12C+p resonance was identified. A gamma-particle experiment using a new system of LYSO scintillators to detect gammas was done.
Recent results in reactions using radioactive ion beams
After more than two and a half decades of radioactive beam physics, the existence of nuclear halos remains as probably the most outstanding discovery in the field. Many measurements have been performed with light halo systems, especially with a 6 He projectile, which has a two-neutron halo. The total reaction cross sections that can be extracted from these measurements follow a system-atic trend that can be compared to the behavior of the respective core, in this case 4 He. By using an appropriate scaling for energies and cross sections, such comparison clearly shows the effects of the halo, which can be separated into static and dynamic effects. For a few systems, where the reactions of the halo have been explicitly measured, application of the same scaling criteria leads to the conclusion of a core-halo decoupling. The behavior of the proton-halo projectile 8 B is similar to that of 6 He insofar as total reaction cross sections are concerned. The measured fusion data for 8 B + 58 ...
Radioactive Ion beams in Brazil (RIBRAS)⋆
The European Physical Journal A, 2005
A double superconducting solenoid system is being installed at the Pelletron Laboratory of the University of São Paulo, Brazil. This system allows the production of secondary beams of light exotic nuclei like 8 Li, 6 He and others. The first results using this facility are presented.
Progress in RIBRAS radioactive ion beams in Brasil project
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2003
Nuclear physics has been going through a major evolution over the last decade. The realization that one can investigate nuclei at extreme conditions such as high density, temperature, and angular momentum using several sophisticated experimental innovations opened up the possibility of extending this activity to the study of these systems when more neutrons or more protons are added. The so called exotic nuclei constitute a major research activity in Japan, France, USA, Canada, Germany and other countries. More laboratories are going through the process of redirection of their experimental effort towards this activity. The nuclear physics community in Brasil has enthusiastically decided to join this endeavor to provide the Pelletron/LINAC complex with two superconducting solenoids which will permit the production of secondary beams of radioactive nuclei. A description of this facility and project RIBRAS follows. r
Radioactive ion beams in Brasil (RIBRAS)
Brazilian Journal of Physics, 2003
The study of the so called exotic nuclei constitutes an important field of research in nuclear physics. The possibility of producing secondary beams of unstable nuclei(RIB) allows the investigation of nuclei at extreme conditions as low binding energies, high angular momentum and isospin. More laboratories are going through the process of redirection of their experimental effort towards this activity. The nuclear physics community in Brazil has enthusiastically decided to join this endeavor to provide the Pelletron/LINAC complex with two superconducting solenoids which will permit the production of secondary beams of radioactive nuclei. A description of this facility and project RIBRAS follows.