Artículos (Física Atómica, Molecular y Nuclear)

URI permanente para esta colecciónhttps://hdl.handle.net/11441/10864

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Measurement of fragmentation cross sections of 12C ions on a thin gold target with the FIRST apparatus
(American Physical Society, 2016) Toppi, M.; Abou-Haidar, Z.; Agodi, C.; González Álvarez, Marcos Aurelio; Aumann, T.; Balestra, F.; Patera, V.; Cortés Giraldo, Miguel Antonio; Fernández García, Juan Pablo; Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear; European Union (UE). FP7; Junta de Andalucía
A detailed knowledge of the light ions interaction processes with matter is of great interest in basic and applied physics. As an example, particle therapy and space radioprotection require highly accurate fragmentation cross-section measurements to develop shielding materials and estimate acute and late health risks for manned missions in space and for treatment planning in particle therapy. The Fragmentation of Ions Relevant for Space and Therapy experiment at the Helmholtz Center for Heavy Ion research (GSI) was designed and built by an international collaboration from France, Germany, Italy, and Spain for studying the collisions of a 12C ion beam with thin targets. The collaboration’s main purpose is to provide the double-differential cross-section measurement of carbon-ion fragmentation at energies that are relevant for both tumor therapy and space radiation protection applications. Fragmentation cross sections of light ions impinging on a wide range of thin targets are also essential to validate the nuclear models implemented inMC simulations that, in such an energy range, fail to reproduce the data with the required accuracy. This paper presents the single differential carbon-ion fragmentation cross sections on a thin gold target, measured as a function of the fragment angle and kinetic energy in the forward angular region (θ 6◦), aiming to provide useful data for the benchmarking of the simulation softwares used in light ions fragmentation applications. The 12C ions used in the measurement were accelerated at the energy of 400 MeV/nucleon by the SIS (heavy ion synchrotron) GSI facility.
Output factor determination for dose measurements in axial and perpendicular planes using a silicon strip detector
(American Physical Society, 2012-04-23) Cortés Giraldo, Miguel Antonio; Quesada Molina, José Manuel; Gallardo Fuentes, María Isabel; Espino Navas, José Manuel; Ovejero Mayoral, María Del Carmen; Ruiz Prieto, Manuel; Arráns Lara, Rafael; González Álvarez, Marcos Aurelio; Pérez Vega-Leal, Alfredo; Abou-Haidar, Z.; Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear; Universidad de Sevilla. Departamento de Ingeniería Electrónica
In this work we present the output factor measurements of a clinical linear accelerator using a silicon strip detector coupled to a new system for complex radiation therapy treatment verification. The objective of these measurements is to validate the system we built for treatment verification. The measurements were performed at the Virgin Macarena University Hospital in Seville. Irradiations were carried out with a Siemens ONCOR (TM) linac used to deliver radiotherapy treatment for cancer patients. The linac was operating in 6 MV photon mode; the different sizes of the fields were defined with the collimation system provided within the accelerator head. The output factor was measured with the silicon strip detector in two different layouts using two phantoms. In the first, the active area of the detector was placed perpendicular to the beam axis. In the second, the innovation consisted of a cylindrical phantom where the detector was placed in an axial plane with respect to the beam. The measured data were compared with data given by a commercial treatment planning system. Results were shown to be in a very good agreement between the compared set of data.
Performance of the reconstruction algorithms of the FIRST experiment pixel sensors vertex detector
(Elsevier, 2014) Rescigno, R.; Finck, C.; Juliani, D.; Spiriti, E.; Baudot, J.; Abou-Haidar, Z.; Agodi, C.; Alvarez, M.A.G.; Cortés Giraldo, Miguel Antonio; Gallardo Fuentes, María Isabel; Quesada Molina, José Manuel; Younis, H.; Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Hadrontherapy treatments use charged particles (e.g. protons and carbon ions) to treat tumors. During a therapeutic treatment with carbon ions, the beam undergoes nuclear fragmentation processes giving rise to significant yields of secondary charged particles. An accurate prediction of these production rates is necessary to estimate precisely the dose deposited into the tumours and the surrounding healthy tissues. Nowadays, a limited set of double differential carbon fragmentation cross-section is available. Experimental data are necessary to benchmark Monte Carlo simulations for their use in hadrontherapy. The purpose of the FIRST experiment is to study nuclear fragmentation processes of ions with kinetic energy in the range from 100 to 1000 MeV/u. Tracks are reconstructed using information from a pixel silicon detector based on the CMOS technology. The performances achieved using this device for hadrontherapy purpose are discussed. For each reconstruction step (clustering, tracking and vertexing), different methods are implemented. The algorithm performances and the accuracy on reconstructed observables are evaluated on the basis of simulated and experimental data.
Performance of upstream interaction region detectors for the FIRST experiment at GSI
(Institute of Physics Publishing, IOP Publishing: arXiv, 2012) Abou-Haidar, Z.; Agodi, C.; Alvarez, M.A.G.; Anelli, M.; Aumann, T.; Battistoni, G.; Bocci, A.; Böhlen, T.T.; Brunetti, A.; Cortés Giraldo, Miguel Antonio; Gallardo Fuentes, María Isabel; Quesada Molina, José Manuel; Younis, H.; Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at GSI has been designed to study carbon fragmentation, measuring 12C double differential cross sections (∂2σ/ ∂θ∂E) for different beam energies between 100 and 1000 MeV/u. The experimental setup integrates newly designed detectors in the, so called, Interaction Region around the graphite target. The Interaction Region upstream detectors are a 250 μm thick scintillator and a drift chamber optimized for a precise measurement of the ions interaction time and position on the target. In this article we review the design of the upstream detectors along with the preliminary results of the data taking performed on August 2011 with 400 MeV/u fully stripped carbon ion beam at GSI. Detectors performances will be reviewed and compared to those obtained during preliminary tests, performed with 500 MeV electrons (at the BTF facility in the INFN Frascati Laboratories) and 80 MeV/u protons and carbon ions (at the INFN LNS Laboratories in Catania).

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Examinando Artículos (Física Atómica, Molecular y Nuclear) por Autor "Abou-Haidar, Z."