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Dive into the research topics where H. Alvarez Pol is active.

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Featured researches published by H. Alvarez Pol.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2013

Particle identification using clustering algorithms

R. Wirth; E. Fiori; B. Löher; D. Savran; J. Silva; H. Alvarez Pol; D. Cortina Gil; B. Pietras; T. Bloch; T. Kröll; E. Nácher; A. Perea; Olof Tengblad; M. Bendel; M. Dierigl; R. Gernhäuser; T. Le Bleis; M. Winkel

Abstract A method that uses fuzzy clustering algorithms to achieve particle identification based on pulse shape analysis is presented. The fuzzy c-means clustering algorithm is used to compute mean (principal) pulse shapes induced by different particle species in an automatic and unsupervised fashion from a mixed set of data. A discrimination amplitude is proposed using these principal pulse shapes to identify the originating particle species of a detector pulse. Since this method does not make any assumptions about the specific features of the pulse shapes, it is very generic and suitable for multiple types of detectors. The method is applied to discriminate between photon- and proton-induced signals in CsI(Tl) scintillator detectors and the results are compared to the well-known integration method.


Journal of Physics: Conference Series | 2016

Experimental study of the 15O(2p, γ)17Ne cross section by Coulomb Dissociation for the rp process

J. Marganiec; F Warners; F. Aksouh; Y. Aksyutina; H. Alvarez Pol; T. Aumann; S. Beceiro; C. A. Bertulani; K. Boretzky; María José García Borge; M. Chartier; A. Chatillon; L. V. Chulkov; D. Cortina-Gil; I. A. Egorova; H. Emling; O. Ershova; Christian Forssén; L. M. Fraile; H. O. U. Fynbo; D. Galaviz; H. Geissel; L. V. Grigorenko; M. Heil; D. H. H. Hoffmann; J. Hoffmann; H. Johansson; B. Jonson; M. Karakoc; C. Karagiannis

The time-reversed reaction O-15(2p, gamma) Ne-17 has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of Ne-20 in a beryllium production target and dissociated on a secondary Pb target. The incoming beam and the reaction products have been identified with the kinematically complete LAND-(RB)-B-3 experimental setup at GSI. The excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb Dissociation cross sections (sigma(Coul)) have been calculated, which provide a photoabsorption (sigma(photo)) and a radiative capture cross section (sigma(cap)). Additionally, important information about the nuclear structure of the Ne-17 nucleus will be obtained. The analysis is in progress.


Journal of Physics: Conference Series | 2016

Experimental study of the O-15(2p, gamma) Ne-17 cross section by Coulomb Dissociation for the rp process

J. Marganiec; F. Wamers; F. Aksouh; Y. Aksyutina; H. Alvarez Pol; T. Aumann; S. Beceiro; C. A. Bertulani; K. Boretzky; María José García Borge; M. Chartier; A. Chatillon; L. V. Chulkov; D. Cortina-Gil; I. A. Egorova; H. Emling; O. Ershova; Christian Forssén; L. M. Fraile; H. O. U. Fynbo; D. Galaviz; H. Geissel; L. V. Grigorenko; M. Heil; D. H. H. Hoffmann; J. Hoffmann; H. Johansson; B. Jonson; M. Karakoc; C. Karagiannis

The time-reversed reaction O-15(2p, gamma) Ne-17 has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of Ne-20 in a beryllium production target and dissociated on a secondary Pb target. The incoming beam and the reaction products have been identified with the kinematically complete LAND-(RB)-B-3 experimental setup at GSI. The excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb Dissociation cross sections (sigma(Coul)) have been calculated, which provide a photoabsorption (sigma(photo)) and a radiative capture cross section (sigma(cap)). Additionally, important information about the nuclear structure of the Ne-17 nucleus will be obtained. The analysis is in progress.


Proceedings of XII International Symposium on Nuclei in the Cosmos — PoS(NIC XII) | 2013

Coulomb breakup of 17 Ne from the view point of nuclear astrophysics

C. Marganiec; F. Aksouh; Y. Aksyutina; H. Alvarez Pol; T. Aumann; S. Beceiro; C. A. Bertulani; K. Boretzky; María José García Borge; M. Chartier; A. Chatillon; L. V. Chulkov; D. Cortina-Gil; I. A. Egorova; H. Emling; O. Ershova; Christian Forssén; L. M. Fraile; H. O. U. Fynbo; D. Galaviz; H. Geissel; L. V. Grigorenko; M. Heil; D. H. H. Hoffmann; J. Hoffmann; H. Johansson; B. Jonson; C. Karagiannis; O. Kiselev; J. V. Kratz

By the Coulomb breakup of 17Ne, the time-reversed reaction 15O(2p,γ)17Ne has been studied. This reaction might play an important role in the rp process, as a break-out reaction of the hot CNO cycle. The secondary 17Ne ion beam with an energy of 500 MeV/nucleon has been dissociated in a Pb target. The reaction products have been detected with the LAND-R3B experimental setup at GSI. The preliminary differential and integral Coulomb dissociation cross section sCoul has been determined, which then will be converted into a photo-absorption cross section sphot o, and a two-proton radiative capture cross section σcap. Additionally, information about the structure of the 17Ne, a potential two-proton halo nucleus, will be received. The analysis is in progress.


international conference on advancements in nuclear instrumentation, measurement methods and their applications | 2011

Total fission cross section of 181 Ta and 208 Pb induced by protons at relativistic energies

Y. Ayyad; J. Benlliure; E. Casarejos; K. H. Schmidt; B. Jurado; A. Kelic-Heil; H. Alvarez Pol; M. V. Ricciardi; R. Pleskač; T. Enqvist; F. Rejmund; L. Giot; V. Henzl; S. Lukic; Son Nguyen Ngoc; A. Boudard; S. Leray; Marcos Antônio Fernandez; T. Kurtukian; P. Nadtochy; C. Schmitt; Daniela Henzlova; C. Paradela; A. Bacquias; D. Pérez Loureiro; V. Föhr; D. Tarrío; K. Kezzar

Total fission cross section induced by protons in 181Ta and 208Pb at energies in the range of 300 to 1000 A MeV have been measured at GSI (Germany) using the inverse kinematics technique. A dedicated setup with high efficiency made it possible to determine these cross sections with high accuracy. The new data seed light in the controversial results obtained so far and contribute to the understanding of the fission process at high excitation energies.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2004

A large area timing RPC prototype for ion collisions in the HADES spectrometer

H. Alvarez Pol; R. Alves; Amalio Blanco; N. Carolino; J. Eschke; R. Ferreira-Marques; P. Fonte; Juan A. Garzón; D. González Díaz; A. Pereira; J. Pietraszko; J. Pinhão; A. Policarpo; J. Stroth


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2004

Performance of shielded timing RPCs in a 12C fragmentation experiment

H. Alvarez Pol; R. Alves; Amalio Blanco; N. Carolino; J. Eschke; R. Ferreira-Marques; P. Fonte; Juan A. Garzón; D. González Díaz; A. Pereira; J. Pietraszko; J. Pinhão; A. Policarpo; J. Stroth


Acta Physica Polonica B | 2014

STUDY OF THE O-15(2p,gamma)Ne-17 CROSS SECTION BY COULOMB DISSOCIATION OF Ne-17 FOR THE rp PROCESS OF NUCLEOSYNTHESIS

J. Marganiec; F. Wamers; F. Aksouh; Y. Aksyutina; H. Alvarez Pol; T. Aumann; S. Beceiro; C. A. Bertulani; K. Boretzky; M. J. G. Borge; M. Chartier; A. Chatillon; L. V. Chulkov; D. Cortina-Gil; I. Egorova; H. Emling; O. Ershova; Christian Forssén; L. M. Fraile; H. O. U. Fynbo; D. Galaviz; H. Geissel; L. V. Grigorenko; M. Heil; D. H. H. Hoffmann; J. Hoffmann; H. Johansson; B. Jonson; M. Karakoc; C. Karagiannis


12th International Symposium on Nuclei in the Cosmos, NIC 2012; Cairns, QLD; Australia; 5 August 2012 through 12 August 2012 | 2012

Coulomb breakup of 17Ne from the viewpoint of nuclear astrophysics

C. Marganiec; F. Aksouh; Y. Aksyutina; H. Alvarez Pol; T. Aumann; S. Beceiro; C. A. Bertulani; K. Boretzky; María José García Borge; M. Chartier; A. Chatillon; L. V. Chulkov; D. Cortina-Gil; I. A. Egorova; H. Emling; O. Ershova; Christian Forssén; L. M. Fraile; H. O. U. Fynbo; D. Galaviz; H. Geissel; L. V. Grigorenko; M. Heil; D. H. H. Hoffmann; J. Hoffmann; H. Johansson; B. Jonson; C. Karagiannis; O. Kiselev; J. V. Kratz


EPJ Web of Conferences | 2010

Investigating the fission process at high excitation energies through proton induced reactions on 181Ta

Y. Ayyad; J. Benlliure; E. Casarejos; H. Alvarez Pol; A. Bacquias; A. Boudard; T. Enqvist; V. Föhr; A. Kelic; K. Kezzar; S. Leray; C. Paradela; D. Pérez-Loureiro; R. Pleskač; D. Tarrío

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A. Chatillon

University of Santiago de Compostela

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D. Cortina-Gil

University of Santiago de Compostela

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S. Beceiro

University of Santiago de Compostela

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C. Karagiannis

GSI Helmholtz Centre for Heavy Ion Research

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D. H. H. Hoffmann

Technische Universität Darmstadt

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H. Emling

GSI Helmholtz Centre for Heavy Ion Research

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H. Geissel

GSI Helmholtz Centre for Heavy Ion Research

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K. Boretzky

GSI Helmholtz Centre for Heavy Ion Research

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O. Ershova

Goethe University Frankfurt

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Y. Aksyutina

GSI Helmholtz Centre for Heavy Ion Research

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