Albert Riego - Academia.edu (original) (raw)

Papers by Albert Riego

Research paper thumbnail of Program of radiological monitoring environmental a nuclear facility in latency

Research paper thumbnail of Safety studies of plasma-wall events with AINA code for Japanese DEMO

Fusion Engineering and Design, 2016

Research paper thumbnail of Determination of gamma radioactivity in aerosols in air for environmental radiological surveillance

Research paper thumbnail of Sistemas en tiempo real: Linux en tiempo real

Research paper thumbnail of Methodology for the improvement of the AINA Code wall-model applied to DEMO WCPB blanket

Fusion Engineering and Design

h i g h l i g h t s • A new AINA code development methodology has been described and standardized... more h i g h l i g h t s • A new AINA code development methodology has been described and standardized. • The 1D non-conservative responses have been compensated by scaling functions. • The scaling functions have been determined covering different conditions.

Research paper thumbnail of A New Code for Spectrometric Analysis for Environmental Radiological Surveillance on Monitors Focused on Gamma Radioactivity on Aerosols

IEEE Transactions on Nuclear Science, 2016

This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for... more This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for con-8 tinuous measurement of gamma radioactivity in aerosols with 9 paper filter. It is called pGamma and has been developed 10 by the Nuclear Engineering Research Group at the Technical 11 University of Catalonia -Barcelona Tech and by Raditel Serveis i 12 Subministraments Tecnològics, Ltd. The code has been developed 13 to identify the gamma emitters and to determine their activ-14 ity concentration. It generates alarms depending on the activity 15 of the emitters and elaborates reports. Therefore it includes a 16 library with NORM and artificial emitters of interest. The code is 17 being adapted to the monitors of the Environmental Radiological 18

Research paper thumbnail of Contribution to safety analyses of DEMO HCPB using AINA code

Fusion Engineering and Design

Research paper thumbnail of Development of the safety code AINA for the European DEMO designs

Fusion Engineering and Design

Research paper thumbnail of A New Code for Spectrometric Analysis for Environmental Radiological Surveillance on Monitors Focused on Gamma Radioactivity on Aerosols

IEEE Transactions on Nuclear Science, 2016

This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for... more This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for con-8 tinuous measurement of gamma radioactivity in aerosols with 9 paper filter. It is called pGamma and has been developed 10 by the Nuclear Engineering Research Group at the Technical 11 University of Catalonia-Barcelona Tech and by Raditel Serveis i 12 Subministraments Tecnològics, Ltd. The code has been developed 13 to identify the gamma emitters and to determine their activ-14 ity concentration. It generates alarms depending on the activity 15 of the emitters and elaborates reports. Therefore it includes a 16 library with NORM and artificial emitters of interest. The code is 17 being adapted to the monitors of the Environmental Radiological 18 Surveillance Network of the local Catalan Government in Spain 19 (Generalitat de Catalunya) and is used at three stations of the 20 Network.

Research paper thumbnail of Approaching the precursor nuclei of the third r-process peak with RIBs

Journal of Physics: Conference Series, 2016

The rapid neutron nucleosynthesis process involves an enormous amount of very exotic neutron-rich... more The rapid neutron nucleosynthesis process involves an enormous amount of very exotic neutron-rich nuclei, which represent a theoretical and experimental challenge. Two of the main decay properties that affect the final abundance distribution the most are half-lives and neutron branching ratios. Using fragmentation of a primary 238 U beam at GSI we were able to measure such properties for several neutron-rich nuclei from 208 Hg to 218 Pb. This contribution provides a short update on the status of the data analysis of this experiment, together with a compilation of the latest results published in this mass region, both experimental and theoretical. The impact of the uncertainties connected with the beta-decay rates and with beta-delayed neutron emission is illustrated on the basis of r-process network calculations. In order to obtain a reasonable reproduction of the third r-process peak, it is expected that both half-lives and neutron branching ratios are substantially smaller, than those based on FRDM+QRPA, commonly used in r-process model calculations. Further measurements around N ∼ 126 are required for a reliable modelling of the underlying nuclear structure, and for performing more realistic r-process abundance calculations.

Research paper thumbnail of Equipment for the Continuous Measurement and Identification of Gamma Radioactivity on Aerosols

IEEE Transactions on Nuclear Science, 2015

This paper describes an equipment for continuous measurement and identification of gamma radioact... more This paper describes an equipment for continuous measurement and identification of gamma radioactivity in aerosols developed by the Nuclear Engineering Research Group (NERG) at the Technical University of Catalonia (UPC) and Raditel Serveis i Subministraments Tecnològics, Ltd. A spectrometric analysis code has been specially designed for it. Spectrum analysis identifies and determines activity concentration of aerosol emitters captured by a fiberglass paper filter. This new equipment is currently operating in three radioactivity monitoring stations of the Environmental Radiological Surveillance Network of the Generalitat of Catalunya (local Catalan government): two near Ascó and Vandellòs Nuclear Power Plants in the province of Tarragona and one in the city of Barcelona. Two more monitors are expected to be deployed at Roses (province of Girona) and Puigcerdà (province of Barcelona). Measurements and evolution analysis results of emitters identified at these stations were also provided.

Research paper thumbnail of Fission Fragment Angular Distribution of 232Th(n,f) at the CERN n_TOF Facility

Nuclear Data Sheets, 2014

Research paper thumbnail of High-accuracy determination of the U 238 / U 235 fission cross section ratio up to ≈ 1 GeV at n_TOF at CERN

Physical Review C, 2015

The 238 U to 235 U fission cross section ratio has been determined at n_TOF up to ≈1 GeV, with tw... more The 238 U to 235 U fission cross section ratio has been determined at n_TOF up to ≈1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets has been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3-4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of neutron energy. The result confirms current evaluations up to 200 MeV. Good agreement is also observed with theoretical calculations based on the INCL+ + /Gemini++ combination up to the highest measured energy. The n_TOF results may help solve a long-standing discrepancy between the two most important experimental datasets available so far above 20 MeV, while extending the neutron energy range for the first time up to ≈1 GeV.

Research paper thumbnail of Lederer Neutron nucleosynthesis PRL

Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (ENEA),

Research paper thumbnail of Sistemas en tiempo real: Linux en tiempo real

Research paper thumbnail of beta-decay and beta-delayed Neutron Emission Measurements at GSI-FRS Beyond N=126, for r-process Nucleosynthesis

Nuclear Data Sheets, 2014

ABSTRACT New measurements of very exotic nuclei in the neutron-rich region beyond N=126 have been... more ABSTRACT New measurements of very exotic nuclei in the neutron-rich region beyond N=126 have been performed at the GSI facility with the fragment separator (FRS). The aim of the experiment is to determine half-lives and β-delayed neutron emission branching ratios of isotopes of Hg, Tl and Pb in this region. This contribution summarizes final counting statistics for identification and for implantation, as well as the present status of the data analysis of the half-lives. In summary, isotopes of Pt, Au, Hg, Tl, Pb, Bi, Po, At, Rn and Fr were clearly identified and several of them (208−211Hg, 211−215Tl, 214−218Pb) were implanted with enough statistics to determine their half-lives. About half of them are expected to be neutron emitters, in such cases it will become possible to obtain the neutron emission probabilities, Pn

Research paper thumbnail of Measurement of the C-12(n, p)B-12 cross section at n_TOF at CERN by in-beam activation analysis

Physical Review C, 2014

The integral cross section of the 12 C(n, p) 12 B reaction has been determined for the first time... more The integral cross section of the 12 C(n, p) 12 B reaction has been determined for the first time in the neutron energy range from threshold to several GeV at the n TOF facility at CERN. The

Research paper thumbnail of A new CVD diamond mosaic-detector for (n, α) cross-section measurements at the n_TOF experiment at CERN

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2013

At the n TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamo... more At the n TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,α) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the 59 Ni(n,α) 56 Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented.

Research paper thumbnail of Neutron research at the N-TOF facility (CERN): Results and perspectives

AIP Conference Proceedings, 2013

ABSTRACT In the first ten years of operation, the neutron time-of-flight facility n_TOF at CERN h... more ABSTRACT In the first ten years of operation, the neutron time-of-flight facility n_TOF at CERN has produced a large body of new and accurate data on neutron capture and fission cross sections, relevant to Nuclear Astrophysics and advanced nuclear technologies. In the next phase, with the construction of a second experimental area with a shorted flight path, the focus of the Collaboration will partially shift from high-resolution measurements of stable or long-lived isotopes, to high-flux measurements of isotopes of relatively short half-life, very low-cross sections, or available in very small quantities. The main results obtained so far at n_TOF and the future perspectives are here presented

Research paper thumbnail of Measurement and analysis of the <span class="aps-inline-formula"><math><mmultiscripts><mi mathvariant="normal">Am</mi><mprescripts></mprescripts><none></none><mn>241</mn></mmultiscripts></math></span>(<span class="aps-inline-formula"><math><mi>n</mi></math></span>,<span class="aps-inline-formula"...

Research paper thumbnail of Program of radiological monitoring environmental a nuclear facility in latency

Research paper thumbnail of Safety studies of plasma-wall events with AINA code for Japanese DEMO

Fusion Engineering and Design, 2016

Research paper thumbnail of Determination of gamma radioactivity in aerosols in air for environmental radiological surveillance

Research paper thumbnail of Sistemas en tiempo real: Linux en tiempo real

Research paper thumbnail of Methodology for the improvement of the AINA Code wall-model applied to DEMO WCPB blanket

Fusion Engineering and Design

h i g h l i g h t s • A new AINA code development methodology has been described and standardized... more h i g h l i g h t s • A new AINA code development methodology has been described and standardized. • The 1D non-conservative responses have been compensated by scaling functions. • The scaling functions have been determined covering different conditions.

Research paper thumbnail of A New Code for Spectrometric Analysis for Environmental Radiological Surveillance on Monitors Focused on Gamma Radioactivity on Aerosols

IEEE Transactions on Nuclear Science, 2016

This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for... more This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for con-8 tinuous measurement of gamma radioactivity in aerosols with 9 paper filter. It is called pGamma and has been developed 10 by the Nuclear Engineering Research Group at the Technical 11 University of Catalonia -Barcelona Tech and by Raditel Serveis i 12 Subministraments Tecnològics, Ltd. The code has been developed 13 to identify the gamma emitters and to determine their activ-14 ity concentration. It generates alarms depending on the activity 15 of the emitters and elaborates reports. Therefore it includes a 16 library with NORM and artificial emitters of interest. The code is 17 being adapted to the monitors of the Environmental Radiological 18

Research paper thumbnail of Contribution to safety analyses of DEMO HCPB using AINA code

Fusion Engineering and Design

Research paper thumbnail of Development of the safety code AINA for the European DEMO designs

Fusion Engineering and Design

Research paper thumbnail of A New Code for Spectrometric Analysis for Environmental Radiological Surveillance on Monitors Focused on Gamma Radioactivity on Aerosols

IEEE Transactions on Nuclear Science, 2016

This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for... more This paper presents a new code for the analy-7 sis of gamma spectra generated by an equipment for con-8 tinuous measurement of gamma radioactivity in aerosols with 9 paper filter. It is called pGamma and has been developed 10 by the Nuclear Engineering Research Group at the Technical 11 University of Catalonia-Barcelona Tech and by Raditel Serveis i 12 Subministraments Tecnològics, Ltd. The code has been developed 13 to identify the gamma emitters and to determine their activ-14 ity concentration. It generates alarms depending on the activity 15 of the emitters and elaborates reports. Therefore it includes a 16 library with NORM and artificial emitters of interest. The code is 17 being adapted to the monitors of the Environmental Radiological 18 Surveillance Network of the local Catalan Government in Spain 19 (Generalitat de Catalunya) and is used at three stations of the 20 Network.

Research paper thumbnail of Approaching the precursor nuclei of the third r-process peak with RIBs

Journal of Physics: Conference Series, 2016

The rapid neutron nucleosynthesis process involves an enormous amount of very exotic neutron-rich... more The rapid neutron nucleosynthesis process involves an enormous amount of very exotic neutron-rich nuclei, which represent a theoretical and experimental challenge. Two of the main decay properties that affect the final abundance distribution the most are half-lives and neutron branching ratios. Using fragmentation of a primary 238 U beam at GSI we were able to measure such properties for several neutron-rich nuclei from 208 Hg to 218 Pb. This contribution provides a short update on the status of the data analysis of this experiment, together with a compilation of the latest results published in this mass region, both experimental and theoretical. The impact of the uncertainties connected with the beta-decay rates and with beta-delayed neutron emission is illustrated on the basis of r-process network calculations. In order to obtain a reasonable reproduction of the third r-process peak, it is expected that both half-lives and neutron branching ratios are substantially smaller, than those based on FRDM+QRPA, commonly used in r-process model calculations. Further measurements around N ∼ 126 are required for a reliable modelling of the underlying nuclear structure, and for performing more realistic r-process abundance calculations.

Research paper thumbnail of Equipment for the Continuous Measurement and Identification of Gamma Radioactivity on Aerosols

IEEE Transactions on Nuclear Science, 2015

This paper describes an equipment for continuous measurement and identification of gamma radioact... more This paper describes an equipment for continuous measurement and identification of gamma radioactivity in aerosols developed by the Nuclear Engineering Research Group (NERG) at the Technical University of Catalonia (UPC) and Raditel Serveis i Subministraments Tecnològics, Ltd. A spectrometric analysis code has been specially designed for it. Spectrum analysis identifies and determines activity concentration of aerosol emitters captured by a fiberglass paper filter. This new equipment is currently operating in three radioactivity monitoring stations of the Environmental Radiological Surveillance Network of the Generalitat of Catalunya (local Catalan government): two near Ascó and Vandellòs Nuclear Power Plants in the province of Tarragona and one in the city of Barcelona. Two more monitors are expected to be deployed at Roses (province of Girona) and Puigcerdà (province of Barcelona). Measurements and evolution analysis results of emitters identified at these stations were also provided.

Research paper thumbnail of Fission Fragment Angular Distribution of 232Th(n,f) at the CERN n_TOF Facility

Nuclear Data Sheets, 2014

Research paper thumbnail of High-accuracy determination of the U 238 / U 235 fission cross section ratio up to ≈ 1 GeV at n_TOF at CERN

Physical Review C, 2015

The 238 U to 235 U fission cross section ratio has been determined at n_TOF up to ≈1 GeV, with tw... more The 238 U to 235 U fission cross section ratio has been determined at n_TOF up to ≈1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets has been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3-4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of neutron energy. The result confirms current evaluations up to 200 MeV. Good agreement is also observed with theoretical calculations based on the INCL+ + /Gemini++ combination up to the highest measured energy. The n_TOF results may help solve a long-standing discrepancy between the two most important experimental datasets available so far above 20 MeV, while extending the neutron energy range for the first time up to ≈1 GeV.

Research paper thumbnail of Lederer Neutron nucleosynthesis PRL

Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (ENEA),

Research paper thumbnail of Sistemas en tiempo real: Linux en tiempo real

Research paper thumbnail of beta-decay and beta-delayed Neutron Emission Measurements at GSI-FRS Beyond N=126, for r-process Nucleosynthesis

Nuclear Data Sheets, 2014

ABSTRACT New measurements of very exotic nuclei in the neutron-rich region beyond N=126 have been... more ABSTRACT New measurements of very exotic nuclei in the neutron-rich region beyond N=126 have been performed at the GSI facility with the fragment separator (FRS). The aim of the experiment is to determine half-lives and β-delayed neutron emission branching ratios of isotopes of Hg, Tl and Pb in this region. This contribution summarizes final counting statistics for identification and for implantation, as well as the present status of the data analysis of the half-lives. In summary, isotopes of Pt, Au, Hg, Tl, Pb, Bi, Po, At, Rn and Fr were clearly identified and several of them (208−211Hg, 211−215Tl, 214−218Pb) were implanted with enough statistics to determine their half-lives. About half of them are expected to be neutron emitters, in such cases it will become possible to obtain the neutron emission probabilities, Pn

Research paper thumbnail of Measurement of the C-12(n, p)B-12 cross section at n_TOF at CERN by in-beam activation analysis

Physical Review C, 2014

The integral cross section of the 12 C(n, p) 12 B reaction has been determined for the first time... more The integral cross section of the 12 C(n, p) 12 B reaction has been determined for the first time in the neutron energy range from threshold to several GeV at the n TOF facility at CERN. The

Research paper thumbnail of A new CVD diamond mosaic-detector for (n, α) cross-section measurements at the n_TOF experiment at CERN

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2013

At the n TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamo... more At the n TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,α) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the 59 Ni(n,α) 56 Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented.

Research paper thumbnail of Neutron research at the N-TOF facility (CERN): Results and perspectives

AIP Conference Proceedings, 2013

ABSTRACT In the first ten years of operation, the neutron time-of-flight facility n_TOF at CERN h... more ABSTRACT In the first ten years of operation, the neutron time-of-flight facility n_TOF at CERN has produced a large body of new and accurate data on neutron capture and fission cross sections, relevant to Nuclear Astrophysics and advanced nuclear technologies. In the next phase, with the construction of a second experimental area with a shorted flight path, the focus of the Collaboration will partially shift from high-resolution measurements of stable or long-lived isotopes, to high-flux measurements of isotopes of relatively short half-life, very low-cross sections, or available in very small quantities. The main results obtained so far at n_TOF and the future perspectives are here presented

Research paper thumbnail of Measurement and analysis of the <span class="aps-inline-formula"><math><mmultiscripts><mi mathvariant="normal">Am</mi><mprescripts></mprescripts><none></none><mn>241</mn></mmultiscripts></math></span>(<span class="aps-inline-formula"><math><mi>n</mi></math></span>,<span class="aps-inline-formula"...