On 14 May Hossein Moeini will defend his thesis 'Feasibility experiment and simulations for EXL'.
Location: Academy Building, Broerstraat 5, Groningen
Time: 11:00 hrs.
Promotores: N. Kalantar-Nayestanaki and M.N. Harakeh
Feasibility experiment and simulations for EXL
Before having the possibility to use radioactive ion beams, one was limited to use only stable or long-lived nuclei as targets. But with the advent of RIB facilities and exploiting reactions in inverse kinematics inside a storage ring, one is now able to extend the nuclear structure investigations to exotic nuclei. This method was applied at ESR in a test experiment in 2005 in which a 136Xe beam with energy of 350 MeV/nucleon was stored into ESR. We had 15 organic scintillators for detection of fast neutrons and charged particles, a position-sensitive p-i-n diode for identification of projectile-like particles, a MWPC for tracking the products of atomic charge-exchange reactions, and a single-sided Si-strip detector with eight groups. The elastic-scattering channel was studied using the first group of the Si-detector, which was the closest to 90⁰ in LAB frame. This was possible primarily because we expect a small contamination from the inelastic scattering channels for this group. Using the spectra of the deposited energy in the fifth group, an attempt was made to investigate the presence of inelastic scattering events. We could estimate the contribution of events coming from excitation of giant dipole resonance. A simulation-based investigation was also performed for a proposed experiment with 56Ni nuclei as beam and 3He nuclei as target. Attempts were made to design an optimized geometry for the recoil and heavy-ion detectors to achieve maximum reaction rates. Based on the derived reaction rates from simulations, we estimated to end up with relative errors of less than 10% in cross section after fifteen days of running the experiment.
Hossein Moeini (Iran, 1978) studied Phsyics at the University of Teheran.
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