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207 results on '"n_TOF"'

1. Measurement of the ⁷²Ge(n,γ) cross section at n_TOF CERN over a wide energy range and implications for stellar nucleosynthesis

Author: Dietz, Mirco, Lederer, Claudia, Woods, Philip, Davinson, Thomas, and Aliotta, Marialuisa
Subjects: 539.7, Nucleosynthesis, Neutron Capture, s-process, Germanium, MACS, n_TOF, Nuclear Astrophysics
Published: 2021
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2. Atomic number and gamma-ray measurements from neutron-induced fission at the ILL and n_ToF

Author: Sosnin, Nikolay and Smith, Alastair
Subjects: 539.7, FiFI, Nuclear, n_TOF, nTOF, PFGS, 235U, CERN, STEFF, Uranium, Fission, ILL
Abstract: The STEFF spectrometer was used at the Neutron Time-of-Flight facility (n ToF) at CERN in 2016 to perform a 30-day long experimental campaign of measurements of fission fragments and gamma rays produced in 235U fission for a wide range of incident neutron energies. A pipeline for reading, correlating and database deposition of the experimental data from this experimental campaign as well as for future STEFF campaigns at n ToF has been constructed. The pipeline resulted in 70-fold data size reduction to an experimental database that can be fully processed in ≈7 hours. The collected gamma-ray data acquired using NaI and LaBr3 detectors have been analyzed in the < 1 eV neutron energy range and compared to prior STEFF 235U fission gamma-ray measurements. A method for correcting NaI signal amplitudes for n ToFspecific effects, such as rates and pulse types, based on fission gamma-ray spectrum shape has been developed. The correcting factors were the greatest for the dedicated proton pulses at neutron energies of ≈0.06 eV, increasing signal amplitude by approximately a factor of 2. Corrections to LaBr3 signals have also been considered and performed based on count rates, with the the largest correcting factors reducing signal amplitude by ≈15%. The corrected and calibrated energy spectra and calculated fold distributions have been prepared for extraction of gamma-ray multiplicity, average energy and total energy in thermal and epithermal fission of 235U. An experiment was conducted at the Lohengrin mass spectrometer at Institut LaueLangevin, France, using a FiFI spectrometer for measurement of masses and atomic numbers of selected 235U fission fragments. The details of the experiment and the data analysis are presented, and a method for calibrating Bragg detectors for atomic number extraction is proposed. The method is based on amplitudes, derivatives and risetimes of signals produced by fission fragments in isobutane fill gas. The extracted signal properties were used in conjunction with known fragment masses and energies to produce functional forms based on powers of fragment velocities and average atomic numbers. Furthermore, a comparison with simulations produced in SRIM-2013 was performed, assessing the accuracy of the simulations.
Published: 2020

3. Development of the STEFF detector for the neutron Time Of Flight facility (n TOF), CERN

Author: Warren, Stuart
Subjects: 539.7, U235, STEFF, PPAC, n_TOF, CERN, MWPC
Abstract: Significant work has been performed on the development of STEFF (SpecTrometer for Exotic Fission Fragments), a 2E2V (2-Energy 2-Velocity) spectrometer built by the University of Manchester Fission Group. The majority of this work was in the development of the time-of-flight systems, in particular the stop detector; with the main goals of improving the timing resolution and the detection effciency of the fission fragments. Further development of the STEFF spectrometer was done to enable 2E2V measurements of the 235U(n,f) reaction with coincident measurements using a white neutron spectra of energies ranging from 10 meV to200 MeV provided by the n TOF (neutron Time Of Flight) facility, CERN. The STEFF spectrometer was successfully operated twice on the Experimental Area-2 high flux pulsed neutron beam line resulting in 2E2V measurements for fission events with neutron energies ranging from 20 meV to 10 MeV. The first experiment received 1.36x10^18 POT (Protons On Target) with stable conditions and the second received 1.53x10^18 POT with stable conditions. The development of the stop detector resulted in a replacement MWPC (Multi-Wire Proportional Counter) detector for the second of the two experiments. This allowed direct comparison for the timing coincidence resolution, sigma_c, between the start and stop detectors and gave sigma_c = 0.81+/-0.08 ns for the prior PPAC (Parallel Plate Avalanche Counter) detector and sigma_c = 0.40 +/- 0.04 ns for the MWPC. The MWPC gave improved the detection efficiency per fission fragment of Eff = 0.67 compared to Eff = 0.43 for the PPAC. The methods and research described in this work also provided alternate stop detector designs with greater performance. This work produced two large data sets from the two successful deployments of the STEFF spectrometer on the n TOF beam line that will be the future work of many nuclear structure scientists to come.
Published: 2017

4. Detector Development for a Double-Differential Cross Section Experiment with the Emission of Light Charged Particles from High Energy Neutrons

Author: Dietz M., Beyer R., Junghans A., Nolte R., Pirovano E., Romanets Y., and Vaz P.
Subjects: n_tof, double-differential cross section, carbon, time-of-flight, high neutron energy, particle detector telescope, neutron dosimetry, Physics, QC1-999
Abstract: Double-differential cross section (DDX) data on the neutron-induced emission of light charged particles are required for assessing the risk of secondary tumors in particle radiation therapy. There are only very few DDX data available for discrete neutron energies close to and above 100 MeV for carbon. A measurement of DDX on carbon is planned at continuous neutron energies from 20 MeV to 200 MeV with particle detector telescopes at n_TOF (CERN). Several detector development criteria and challenges are reported such as coincidence timing and electromagnetic oscillations for high neutron energy events with particle separation.
Published: 2023
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5. Radiative Neutron Capture Cross-Section Measurement of Ge Isotopes at n_TOF CERN Facility and Its Importance for Stellar Nucleosynthesis.

Author: GAWLIK, A., LEDERER-WOODS, C., ANDRZEJEWSKI, J., PERKOWSKI, J., BATTINO, U., FERREIRA, P., GUNSING, F., HEINITZ, S., KRTICKA, M., MASSIMI, C., MINGRONE, F., REIFARTH, R., TATTERSALL, A., VALENTA, S., WEISS, C., ABERLE, O., AUDOUIN, L., BACAK, M., BALIBREA, J., and BARBAGALLO, M.
Subjects: *NEUTRON capture, *NUCLEOSYNTHESIS, *NEUTRON temperature, *NUCLEAR structure, *BINDING energy, *ISOTOPES
Abstract: This manuscript summarizes the results of radiative neutron capture cross-section measurements on two stable germanium isotopes, 70Ge and 73Ge. Experiments were performed at the n_TOF facility at CERN via the time-of-flight technique, over a wide neutron energy range, for all stable germanium isotopes (70,72,73,74, and 76). Results for 70Ge [Phys. Rev. C 100, 045804 (2019)] and 73Ge [Phys. Lett. B 790, 458 (2019)] are already published. In the field of nuclear structure, such measurements allow to study excited levels close to the neutron binding energy and to obtain information on nuclear properties. In stellar nucleosynthesis research, neutron induced reactions on germanium are of importance for nucleosynthesis in the weak component of the slow neutron capture processes. [ABSTRACT FROM AUTHOR]
Published: 2021
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6. NEAR: A New Station to Study Neutron-Induced Reactions of Astrophysical Interest at CERN-n_TOF

Author: Gianpiero Gervino, Oliver Aberle, Ana-Paula Bernardes, Nicola Colonna, Sergio Cristallo, Maria Diakaki, Salvatore Fiore, Alice Manna, Cristian Massimi, Pierfrancesco Mastinu, Alberto Mengoni, Riccardo Mucciola, Elizabeth Musacchio González, Nikolas Patronis, Elisso Stamati, Pedro Vaz, and Rosa Vlastou
Subjects: n_TOF, NEAR, neutron activation, nuclear astrophysics, s-process, r-process, Elementary particle physics, QC793-793.5
Abstract: We present NEAR, a new experimental area at the CERN-n_TOF facility and a possible setup for cross section measurements of interest to nuclear astrophysics. This was recently realized with the aim of performing spectral-averaged neutron-capture cross section measurements by means of the activation technique. The recently commissioned NEAR station at n_TOF is now ready for the physics program, which includes a preliminary benchmark of the proposed idea. Based on the results obtained by dedicated Monte Carlo simulations and calculation, a suitable filtering of the neutron beam is expected to enable measurements of Maxwellian Averaged Cross Section (MACS) at different temperatures. To validate the feasibility of these studies we plan to start the measurement campaign by irradiating several isotopes whose MACS at different temperatures have recently been or are planned to be determined with high accuracy at n_TOF, as a function of energy in the two time-of-flight measurement stations. For instance, the physical cases of 88Sr(n,γ), 89Y(n,γ), 94Zr(n,γ) and 64Ni(n,γ) are discussed. As the neutron capture on 89Y produces a pure β-decay emitter, we plan to test the possibility to perform activation measurements on such class of isotopes as well. The expected results of these measurements would open the way to challenging measurements of MACS by the activation technique at n_TOF, for rare and/or exotic isotopes of interest for nuclear astrophysics.
Published: 2022
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7. Study of 241Am(n,f) reaction at the CERN n_TOF facility

Author: Eleme, Zinovia, Πατρώνης, Νικόλαος, Ζάννη-Βλαστού, Ρόζα, Κόκκορης, Μιχαήλ, Κόκκας, Παναγιώτης, Νικολής, Νικόλαος, Παπαδόπουλος, Ιωάννης, and Colonna, Nicola
Subjects: Neutrons, Americium-241, Ενεργός διατομή σχάσης επαγόμενης από νετρόνια, Cern, n_TOF, Neutron induced fission cross section, EAR-2, Αμερίκιο-241, Micromegas
Abstract: High accuracy cross section data of neutron-induced reactions of minor actinides, are needed over a wide energy range for the feasibility, design and sensitivity studies on innovative nuclear reactors (Accelerator Driven Systems -ADS and Generation IV Fast Neutron Reactors). The concept of these systems is to incinerate/transmutate the existing actinides found in high-level nuclear waste. With the incineration/transmutation, both the half-life of the radioactive isotopes can be reduced as well as the volume of these pollutants or their wastes, so that the final nuclear waste from the reactor material that should be stored is less hazardous. Representing almost 1.8 % of the actinide mass in spent PWR UOX fuel, the 241Am isotope (T1/2 = 433 y) is considered one of the possible candidates for incineration/transmutation. On top of that, its production rate increases within the spent fuel through the β-decay of 241Pu (T1/2 = 14.3 y). Consequently, the accurate determination of the fission reaction rate of 241Am over an extended energy range is of prime importance. In the present thesis, the 241Am(n,f) reaction cross section was measured with Μicromegas detectors at the vertical experimental area (EAR-2) of the n_TOF facility at CERN, taking advantage of the high instantaneous neutron flux and using the time-of-flight technique. For the measurement, six targets of 241Am were used with a total activity of 0.1 GBq, whereas two targets of 235U and two targets of 238U were employed as reference and served as neutron flux monitors. In this work, a detailed description of the experimental set-up is given along with the data analysis procedure that was followed. The resulting nuclear cross section data, covering a broad spectrum from the meV up to the MeV neutron energy region, are presented and compared with previous data and nuclear data evaluations. Finally, the experimental results are framed with theoretical calculations that were performed using the TALYS-1.95 code. Για τις μελέτες σκοπιμότητας, σχεδιασμού και ευαισθησίας σε καινοτόμους πυρηνικούς αντιδραστήρες (Επιταχυντικά Συστήματα Ενισχυτών Ενέργειας -ADS και 4ης Γενιάς Αντιδραστήρες Ταχέων Νετρονίων), απαιτούνται υψηλής ακρίβειας πυρηνικά δεδομένα ενεργών διατομών, κυρίως για αντιδράσεις νετρονίων με ελάσσονες ακτινίδες. Οι νέοι αυτοί αντιδραστήρες ταχέων νετρονίων επιτρέπουν την αποτέφρωση/μεταστοιχείωση των υπαρχόντων ακτινίδων σε πυρηνικά απόβλητα υψηλής ραδιολογικής και χημικής τοξικότητας. Με την αποτέφρωση/μεταστοιχείωση, μπορεί να μειωθεί τόσο ο χρόνος ημιζωής των ραδιενεργών ισοτόπων όσο και ο όγκος αυτών των ρύπων ή των αποβλήτων τους, έτσι ώστε τα τελικά πυρηνικά απόβλητα από το υλικό των αντιδραστήρων που πρέπει να αποθηκευτούν να είναι λιγότερο επιβλαβή για το περιβάλλον. Αντιπροσωπεύοντας περίπου το 1.8 % σε αναλωμένο καύσιμο πυρηνικών αντιδραστήρων PWR UOX, το ισότοπο 241Am (T1/2 = 433 y) θεωρείται ένα από τα υποψήφια ισότοπα για αποτέφρωση/μεταστοιχείωση. Επιπλέον, ο ρυθμός παραγωγής του αυξάνεται εντός του αναλωμένου καυσίμου μέσω της β-αποδιέγερσης του 241Pu (T1/2 = 14.3 y). Κατά συνέπεια, ο ακριβής προσδιορισμός του ρυθμού αντίδρασης σχάσης του ισοτόπου 241Am σε ένα εκτεταμένο εύρος ενέργειας είναι πρωταρχικής σημασίας. Στην παρούσα διατριβή, η ενεργός διατομή της αντίδρασης 241Am(n,f) μετρήθηκε με ανιχνευτές Μicromegas στην κατακόρυφη πειραματική περιοχή (EAR-2) της εγκατάστασης n_TOF στο CERN, λαμβάνοντας ωφέλεια από την υψηλή στιγμιαία ροή νετρονίων και χρησιμοποιώντας την τεχνική του χρόνου πτήσης. Για τη μέτρηση χρησιμοποιήθηκαν έξι στόχοι 241Am με συνολική ενεργότητα 0.1 GBq, ενώ δύο στόχοι 235U και δύο στόχοι 238U χρησιμοποιήθηκαν ως στόχοι αναφοράς και χρησίμευσαν στην καταγραφή της ροής των νετρονίων. Σε αυτή την εργασία δίνεται μια λεπτομερής περιγραφή της πειραματικής διάταξης καθώς και της διαδικασίας ανάλυσης δεδομένων που ακολουθήθηκε. Τα πυρηνικά δεδομένα ενεργών διατομών που προέκυψαν, καλύπτοντας ένα ευρύ φάσμα από την meV έως την MeV ενεργειακή περιοχή νετρονίων, παρουσιάζονται και συγκρίνονται με προηγούμενα δεδομένα και αξιολογήσεις πυρηνικών δεδομένων. Τέλος, τα πειραματικά αποτελέσματα πλαισιώνονται με θεωρητικούς υπολογισμούς που πραγματοποιήθηκαν χρησιμοποιώντας τον κώδικα TALYS-1.95. 144 σ.
Published: 2023
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8. The 14N(n,p) reaction cross-section measurement at n TOF - CERN and its application to the design of a facility for neutron capture therapy

Author: Torres Sánchez, Pablo, Porras Sánchez, José Ignacio, Praena Rodríguez, Antonio Javier, and Universidad de Granada. Programa de Doctorado en Física y Ciencias del Espacio
Subjects: CERN, n_TOF, Neutron Capture Therapy
Abstract: Experimental nuclear data and simulations are crucial for new radiotherapies of cancer. In Boron Neutron Capture Therapy (BNCT), an accurate knowledge of neutron interaction with the elements present in body tissues is key for dosimetry. At low neutron energies, the reaction between neutrons and nitrogen, 14N(n,p), becomes a main component of the dose in most human tissues. There are several discrepancies in previous measurements of this reaction, which increase the uncertainty in dose estimations needed for treatment planning. Furthermore, Neutron Capture Therapy needs intense and clean neutron sources, suitable for therapy and with the possibility of being installed in hospital environments, getting over previous facilities at nuclear reactors. This thesis aims to contribute to these two topics. The nuclear data from a new measurement of the 14N(n,p) reaction, carried out at the n TOF Facility at CERN will be shown. The new high-accuracy data span from 8 meV to 800 keV, covering the range of interest for BNCT, including the thermal point (25.3 meV), whose cross-section value was found to be at 1.809 0.045 b. The implications of this new nuclear data to BNCT dosimetry will be explored via Monte Carlo simulations. A new Beam Shaping Assembly (BSA) will be proposed for a proton acceleratorbased neutron source, using 30 mA of 2.1 MeV protons onto a lithium target. This BSA produces a high-intensity and well-collimated neutron eld that also provides low contamination from gamma radiation and both thermal and fast neutrons. The spectrum of the beam coming out of the BSA aperture will be shown to be adequate for BNCT treatments, full lling all recommendations from the IAEA and also performing well in in-phantom dose simulations. The new nuclear data and the proposed neutron beam will be put together as input in order to develop a Treatment Planning System (TPS). The TPS processes medical images (DICOM) and runs Monte Carlo simulations of neutron transport through the model of the patient, allowing to compute dose estimations in the tumor and surrounding tissues, including organs at risk. The TPS will be used to perform a pilot test simulation with a realistic case of a Glioblastoma patient., El uso de datos nucleares experimentales y simulaciones es crucial para nuevas formas de radioterapia contra el cáncer. En la Terapia mediante Captura de Neutrones por Boro (BNCT, por sus siglas en ingles), un conocimiento preciso de la interacción de los neutrones con los elementos presentes en los tejidos corporales es clave para la dosimetría. La reacción de los neutrones con el nitrógeno, 14N(n,p), es una componente muy importante de la dosis en la mayor a de tejidos humanos para neutrones de baja energía. Existen discrepancias entre varias medidas anteriores de esta reacción, lo que aumenta la incertidumbre en las estimaciones de dosis necesarias para plantificar un tratamiento. Por otra parte, la Terapia por Captura de Neutrones necesita fuentes de neutrones intensas y limpias, adecuadas para terapia y que tengan la posibilidad de instalarse en el entorno hospitalario, a diferencia de las instalaciones anteriores que se han construido en reactores nucleares. Esta tesis pretende contribuir a resolver estos dos problemas. Se mostrarán los datos nucleares obtenidos en una nueva medida de la reacción 14N(n,p) realizada en las instalaciones de neutrones por tiempo de vuelo (n TOF) del CERN. Los nuevos datos de alta precisión abarcan el rango entre 8 meV y 800 keV, cubriendo por completo el rango de interés para BNCT, lo que incluye el punto térmico (25.3 meV), para el cual se ha encontrado que la sección e caz es 1.809 0.045 b. Las repercusiones de estos nuevos datos nucleares para la dosimetría en BNCT serán exploradas usando simulación Monte Carlo. Se propone un nuevo dispositivo conformador de haces (Beam Shaping Assembly, BSA), diseñado para una fuente de neutrones basada en acelerador, con 30 mA de protones a 2.1 MeV sobre un blanco de litio. Esta BSA produce un campo de neutrones colimado de alta intensidad que además presenta una contaminación baja por radiación gamma y neutrones rápidos o térmicos. Se mostrar a que el espectro del haz de neutrones a la salida de la apertura de la BSA es adecuado para tratamientos de BNCT, cumpliendo todas las recomendaciones del Organismo Internacional para la Energía Atómica (OIEA) y además mostrando buenos resultados con simulaciones de dosis en maniquíes. Tanto los nuevos datos nucleares como el haz de neutrones propuesto se combinarán como inputs en el desarrollo de un Sistema de Planificación de Tratamientos (TPS, por sus siglas en inglés). El TPS procesa imágenes médicas DICOM y ejecuta simulaciones Monte Carlo de transporte de neutrones en un modelo del paciente, lo que permite calcular la dosis en el tumor y los tejidos circundantes, incluyendo los órganos de riesgo. El TPS ser a usado para realizar una simulación de prueba piloto con un caso realista de paciente con Glioblastoma., Tesis Univ. Granada.
Published: 2022

9. Preparation and characterization of three 7Be targets for the measurement of the 7Be(n, p)7Li and 7Be(n, [formula omitted])7Li reaction cross sections.

Author: Maugeri, E.A., Heinitz, S., Dressler, R., Barbagallo, M., Ulrich, J., Schumann, D., Colonna, N., Köster, U., Ayranov, M., Vontobel, P., Mastromarco, M., Schell, J., Correia, J. Martins, and Stora, T.
Subjects: *BERYLLIUM, *REACTION cross sections, *NUCLEOSYNTHESIS, *THERMAL neutrons, *NUCLEAR reactions
Abstract: This manuscript describes the production of three targets obtained by implantation of different activities of 7 Be into thin aluminium disks. Two of the produced targets were used to measure the 7 Be(n, p) 7 Li cross section in the energy range of interest for the Big-Bang Nucleosynthesis. A third target was used to measure the cross sections of 7 Be(n, p) 7 Li and 7 Be(n, α ) 7 Li nuclear reactions with cold and thermal neutrons, respectively. This paper describes also the characterization of the first two targets, performed after the neutron irradiation, in terms of implanted 7 Be activities and spatial distributions. [ABSTRACT FROM AUTHOR]
Published: 2018
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10. Design, prototyping, and thermo-mechanical modelling of a neutron spallation target impacted by high-energy proton-beam pulses in the n_TOF facility at CERN

Author: Esposito, Raffaele, Logé, Roland, and Calviani, Marco
Subjects: lead, Accelerators and Storage Rings, target, beam irradiation test, neutron, Engineering, HiRadMat, CERN, time of flight, Physics::Accelerator Physics, n_TOF, Nuclear Experiment, Pb, constitutive
Abstract: This manuscript describes the design work and the R&D activities carried out for the third-generation neutron production target in the neutron Time-Of-Flight (n_TOF) facility at the European Laboratory for Particle Physics (CERN). The facility is composed of a neutron source coupled to two flight paths delivering a white-spectrum, pulsed neutron beam to two experimental areas. The neutrons are produced by the spallation reaction induced in lead-based target by a pulsed high-intensity proton beam with a momentum of 20 GeV/c extracted by the Proton Synchrotron, one of the circular particle accelerators of the CERN complex. The impact of high-energy proton beam pulses induces severe thermo-mechanical loads on the target, posing challenges for the target design. A description of the design process is provided, which started with the examination of multiple potential target concepts by means of numerical codes aimed to find a design offering an optimal combination of physics performance and thermo-mechanical response. The process converges towards a final design based on a series of pure-lead blocks supported by an anticreep structure in aluminum alloy and cooled by nitrogen gas. Novel approaches to simulate material response are presented and degraded operational scenarios are analyzed. The execution of two beam irradiation tests on target prototypes in a dedicated CERN facility is described, followed by post-irradiation examinations including neutron tomography inspections. The manuscript ends presenting the results of cyclic mechanical characterization tests on pure lead at different temperatures and strain-rates, and the proposal of a new constitutive model to better simulate the evolution of the material behaviour when subjected to repeated impacts of proton beam pulses.
Published: 2022
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11. An improved method for estimating the neutron background in measurements of neutron capture reactions.

Author: Žugec, P., Bosnar, D., Colonna, N., and Gunsing, F.
Subjects: *NEUTRON capture, *NEUTRON scattering, *LOW-energy nuclear reactions, *RELATIVISTIC kinematics, *DATA analysis, *TIME-of-flight mass spectrometers
Abstract: The relation between the neutron background in neutron capture measurements and the neutron sensitivity related to the experimental setup is examined. It is pointed out that a proper estimate of the neutron background may only be obtained by means of dedicated simulations taking into account the full framework of the neutron-induced reactions and their complete temporal evolution. No other presently available method seems to provide reliable results, in particular under the capture resonances. An improved neutron background estimation technique is proposed, the main improvement regarding the treatment of the neutron sensitivity, taking into account the temporal evolution of the neutron-induced reactions. The technique is complemented by an advanced data analysis procedure based on relativistic kinematics of neutron scattering. The analysis procedure allows for the calculation of the neutron background in capture measurements, without requiring the time-consuming simulations to be adapted to each particular sample. A suggestion is made on how to improve the neutron background estimates if neutron background simulations are not available. [ABSTRACT FROM AUTHOR]
Published: 2016
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12. Radiative neutron capture cross-section measurement of ge isotopes at n_TOF CERN facility and its importance for stellar nucleosynthesis

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Gawlik Ramiega, Aleksandra, Lederer-Woods, C., Andrzejewski, Józef, Battino, U., Mingrone, Federica, Weiss, Christina, Aberle, O., Audouin, Ludmila, Bacak, Michael, Balibrea-Correa, J., Barbagallo, Massimo, Barros, S., Bécares, Vicente, Becvar, F., Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Gawlik Ramiega, Aleksandra, Lederer-Woods, C., Andrzejewski, Józef, Battino, U., Mingrone, Federica, Weiss, Christina, Aberle, O., Audouin, Ludmila, Bacak, Michael, Balibrea-Correa, J., Barbagallo, Massimo, Barros, S., Bécares, Vicente, Becvar, F., Calviño Tavares, Francisco, Casanovas Hoste, Adrià, and Cortés Rossell, Guillem Pere
Abstract: This manuscript summarizes the results of radiative neutron capture cross-section measurements on two stable germanium isotopes, 70Ge and 73Ge. Experiments were performed at the n_TOF facility at CERN via the time-of-flight technique, over a wide neutron energy range, for all stable germanium isotopes (70,72,73,74, and 76). Results for 70Ge [Phys. Rev. C 100, 045804 (2019)] and 73Ge [Phys. Lett. B 790, 458 (2019)] are already published. In the field of nuclear structure, such measurements allow to study excited levels close to the neutron binding energy and to obtain information on nuclear properties. In stellar nucleosynthesis research, neutron induced reactions on germanium are of importance for nucleosynthesis in the weak component of the slow neutron capture processes., Peer Reviewed, Article signat per 134 autors/autores: A. Gawlik, C. Lederer-Woods, J. Andrzejewski, J. Perkowski, U. Battino, P. Ferreira, F. Gunsing, S. Heinitz, M. Krtička, C. Massimi, F. Mingrone, R. Reifarth, A. Tattersall, S. Valenta, C. Weiss, O. Aberle, L. Audouin, M. Bacak, J. Balibrea, M. Barbagallo, S. Barros, V. Bécares, F. Bečvář, C. Beinrucker, E. Berthoumieux, J. Billowes, D. Bosnar, M. Brugger, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, D.M. Castelluccio, F. Cerutti, Y.H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M.A. Cortés-Giraldo, L. Cosentino, L.A. Damone, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, V. Furman, K. Göbel, A.R. García, T. Glodariu, I.F. Gonçalves, E. González-Romero, A. Goverdovski, E. Griesmayer, C. Guerrero, H. Harada, T. Heftrich, J. Heyse, D.G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, T. Katabuchi, P. Kavrigin, V. Ketlerov, V. Khryachkov, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, E. Leal-Cidoncha, H. Leeb, J. Lerendegui-Marco, S. Lo Meo, S.J. Lonsdale, R. Losito, D. Macina, T. Martínez, P. Mastinu, M. Mastromarco, F. Matteucci, E.A. Maugeri, E. Mendoza, A. Mengoni, P.M. Milazzo, M. Mirea, S. Montesano, A. Musumarra, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J.I. Porras, J. Praena, J.M. Quesada, K. Rajeev, T. Rauscher, A. Riego-Perez, P.C. Rout, C. Rubbia, J.A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Sedyshev, A.G. Smith, A. Stamatopoulos, G. Tagliente, J.L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, M. Weigand, C. Wolf, P.J. Woods, T. Wright, P. Žugec, Objectius de Desenvolupament Sostenible::7 - Energia Assequible i No Contaminant, Postprint (author's final draft)
Published: 2021

13. First results of the140ce(N,¿)141ce cross-section measurement at n_tof

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Amaducci, Simone, Colonna, Nicola, Cosentino, Luigi, Cristallo, Sergio, Finocchio, Elisabetta, Massimi, Cristian, Mastromarco, Mario, Aberle, O., Alcayne Aicua, Víctor, Andrzejewski, Józef, Babiano Suárez, Víctor, Bacak, Michael, Barbagallo, Massimo, Berthoumieux, Eric, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Amaducci, Simone, Colonna, Nicola, Cosentino, Luigi, Cristallo, Sergio, Finocchio, Elisabetta, Massimi, Cristian, Mastromarco, Mario, Aberle, O., Alcayne Aicua, Víctor, Andrzejewski, Józef, Babiano Suárez, Víctor, Bacak, Michael, Barbagallo, Massimo, Berthoumieux, Eric, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, and Cortés Rossell, Guillem Pere
Abstract: An accurate measurement of the 140Ce(n,¿) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large extent the cerium abundance in stars. The measurement was motivated by the significant difference between the cerium abundance measured in globular clusters and the value predicted by theoretical stellar models. This discrepancy can be ascribed to an overestimation of the 140Ce capture cross-section due to a lack of accurate nuclear data. For this measurement, we used a sample of cerium oxide enriched in 140Ce to 99.4%. The experimental apparatus consisted of four deuterated benzene liquid scintillator detectors, which allowed us to overcome the difficulties present in the previous measurements, thanks to their very low neutron sensitivity. The accurate analysis of the p-wave resonances and the calculation of their average parameters are fundamental to improve the evaluation of the 140Ce Maxwellian-averaged cross-section., Peer Reviewed, Article signat per 130 autors/es: Simone Amaducci, Nicola Colonna, Luigi Cosentino, Sergio Cristallo, Paolo Finocchiaro, Milan Krtiˇcka, Cristian Massimi, Mario Mastromarco, Annamaria Mazzone, Alberto Mengoni, Stanislav Valenta, Oliver Aberle, Victor Alcayne, Józef Andrzejewski, Laurent Audouin, Victor Babiano-Suarez, Michael Bacak, Massimo Barbagallo, Samuel Bennett, Eric Berthoumieux, Jon Billowes, Damir Bosnar, Adam Brown, Maurizio Busso, Manuel Caamaño, Luis Caballero-Ontanaya, Francisco Calviño, Marco Calviani, Daniel Cano-Ott, Adria Casanovas, Francesco Cerutti, Enrico Chiaveri, Guillem Cortés, Miguel Cortés-Giraldo, Lucia-Anna Damone, Paul-John Davies, Maria Diakaki, Mirco Dietz, Cesar Domingo-Pardo, Rugard Dressler, Quentin Ducasse, Emmeric Dupont, Ignacio Durán, Zinovia Eleme, Beatriz Fernández-Domínguez, Alfredo Ferrari, Valter Furman, Kathrin Göbel, Ruchi Garg, Aleksandra Gawlik, Simone Gilardoni, Isabel Gonçalves, Enrique González-Romero, Carlos Guerrero, Frank Gunsing, Hideo Harada, Stephan Heinitz, Jan Heyse, David Jenkins, Arnd Junghans, Franz Käppeler, Yacine Kadi, Atsushi Kimura, Ingrid Knapova, Michael Kokkoris, Yuri Kopatch, Deniz Kurtulgil, Ion Ladarescu, Claudia Lederer-Woods, Helmut Leeb, Jorge Lerendegui-Marco, Sarah-Jane Lonsdale, Daniela Macina, Alice Manna, Trinitario Martínez, Alessandro Masi, Pierfrancesco Mastinu, Emilio-Andrea Maugeri, Emilio Mendoza, Veatriki Michalopoulou, Paolo Milazzo, Federica Mingrone, Javier Moreno-Soto, Agatino Musumarra, Alexandru Negret, Francisco Ogállar, Andreea Oprea, Nikolas Patronis, Andreas Pavlik, Jarosław Perkowski, Luciano Piersanti, Cristina Petrone, Elisa Pirovano, Ignacio Porras, Javier Praena, José-Manuel Quesada, Diego Ramos-Doval, Thomas Rauscher, René Reifarth, Dimitri Rochman, Carlo Rubbia, Marta Sabaté-Gilarte, Alok Saxena, Peter Schillebeeckx, Dorothea Schumann, Adhitya Sekhar, Gavin Smith, Nikolay Sosnin, Peter Sprung, Athanasios Stamatopoulos, Giuseppe Tagliente, José Tain, Ariel Tarifeño, Postprint (author's final draft)
Published: 2021

14. Radiative neutron capture cross-section measurement of ge isotopes at n_TOF CERN facility and its importance for stellar nucleosynthesis

Author: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Austrian Science Fund, UK Science and Facilities Council, European Research Council (ERC), National Science Center. Poland, MSMT. Czech Republic, Croatian Science Foundation, Gawlik, A., Lederer-Woods, C., Andrzejewski, J., Perkowski, J., Battino, U., Ferreira, P., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Quesada Molina, José Manuel, Zugec, P., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Austrian Science Fund, UK Science and Facilities Council, European Research Council (ERC), National Science Center. Poland, MSMT. Czech Republic, Croatian Science Foundation, Gawlik, A., Lederer-Woods, C., Andrzejewski, J., Perkowski, J., Battino, U., Ferreira, P., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Quesada Molina, José Manuel, and Zugec, P.
Abstract: This manuscript summarizes the results of radiative neutron capture cross-section measurements on two stable germanium isotopes, 70Ge and 73Ge. Experiments were performed at the n_TOF facility at CERN via the time-of-flight technique, over a wide neutron energy range, for all stable germanium isotopes (70,72,73,74, and 76). Results for 70Ge [Phys. Rev. C 100, 045804 (2019)] and 73Ge [Phys. Lett. B 790, 458 (2019)] are already published. In the field of nuclear structure, such measurements allow to study excited levels close to the neutron binding energy and to obtain information on nuclear properties. In stellar nucleosynthesis research, neutron induced reactions on germanium are of importance for nucleosynthesis in the weak component of the slow neutron capture processes. © 2021 Polish Academy of Sciences. All rights reserved.
Published: 2021

15. First Results of the 140Ce(n,gamma)141Ce Cross-Section Measurement at n_TOF

Author: Amaducci, S., Colonna, N., Cosentino, L., Cristallo, S., Finocchiaro, P., Krtička, M., Massimi, C., Mastromarco, M., Mazzone, A., Mengoni, A., Valenta, S., Aberle, O., Alcayne, V., Andrzejewski, J., Audouin, L., Babiano-Suarez, V., Bacak, M., Barbagallo, M., Bennett, S., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caamaño, M., Caballero-Ontanaya, L., Calviño, F., Calviani, M., Cano-Ott, D., Casanovas, A., Cerutti, F., Chiaveri, E., Cortés, G., Cortés-Giraldo, M., Damone, L.-A., Davies, P.-J., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dressler, R., Ducasse, Q., Dupont, E., Durán, I., Eleme, Z., Fernández-Dominguez, B., Ferrari, A., Furman, V., Göbel, K., Garg, R., Gawlik, A., Gilardoni, S., Gonçalves, I., González-Romero, E., Guerrero, C., Gunsing, F., Harada, H., Heinitz, S., Heyse, J., Jenkins, D., (0000-0001-7703-2471) Junghans, A., Käppeler, F., Kadi, Y., Kimura, A., Knapova, I., Kokkoris, M., Kopatch, Y., Kurtulgil, D., Ladarescu, I., Lederer-Woods, C., Leeb, H., Lerendegui-Marco, J., Lonsdale, S.-J., Macina, D., Manna, A., Martinez, T., Masi, A., Mastinu, P., Maugeri, E.-A., Mendoza, E., Michalopoulou, V., Milazzo, P., Mingrone, F., Moreno-Soto, J., Musumarra, A., Negret, A., Ogállar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Piersanti, L., Petrone, C., Pirovano, E., Porras, I., Praena, J., Quesada, J.-M., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Rubbia, C., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, G., Sosnin, N., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J., Tarifeño-Saldivia, A., Tassan-Got, L., Thomas, B., Torres-Sánchez, P., Tsinganis, A., Ulrich, J., (0000-0002-2227-8973) Urlaß, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P., Wright, T., Žugec, P., Amaducci, S., Colonna, N., Cosentino, L., Cristallo, S., Finocchiaro, P., Krtička, M., Massimi, C., Mastromarco, M., Mazzone, A., Mengoni, A., Valenta, S., Aberle, O., Alcayne, V., Andrzejewski, J., Audouin, L., Babiano-Suarez, V., Bacak, M., Barbagallo, M., Bennett, S., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caamaño, M., Caballero-Ontanaya, L., Calviño, F., Calviani, M., Cano-Ott, D., Casanovas, A., Cerutti, F., Chiaveri, E., Cortés, G., Cortés-Giraldo, M., Damone, L.-A., Davies, P.-J., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dressler, R., Ducasse, Q., Dupont, E., Durán, I., Eleme, Z., Fernández-Dominguez, B., Ferrari, A., Furman, V., Göbel, K., Garg, R., Gawlik, A., Gilardoni, S., Gonçalves, I., González-Romero, E., Guerrero, C., Gunsing, F., Harada, H., Heinitz, S., Heyse, J., Jenkins, D., (0000-0001-7703-2471) Junghans, A., Käppeler, F., Kadi, Y., Kimura, A., Knapova, I., Kokkoris, M., Kopatch, Y., Kurtulgil, D., Ladarescu, I., Lederer-Woods, C., Leeb, H., Lerendegui-Marco, J., Lonsdale, S.-J., Macina, D., Manna, A., Martinez, T., Masi, A., Mastinu, P., Maugeri, E.-A., Mendoza, E., Michalopoulou, V., Milazzo, P., Mingrone, F., Moreno-Soto, J., Musumarra, A., Negret, A., Ogállar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Piersanti, L., Petrone, C., Pirovano, E., Porras, I., Praena, J., Quesada, J.-M., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Rubbia, C., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, G., Sosnin, N., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J., Tarifeño-Saldivia, A., Tassan-Got, L., Thomas, B., Torres-Sánchez, P., Tsinganis, A., Ulrich, J., (0000-0002-2227-8973) Urlaß, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P., Wright, T., and Žugec, P.
Abstract: An accurate measurement of the 140Ce(n,g) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large extent the cerium abundance in stars. The measurement was motivated by the significant difference between the cerium abundance measured in globular clusters and the value predicted by theoretical stellar models. This discrepancy can be ascribed to an overestimation of the 140Ce capture cross-section due to a lack of accurate nuclear data. For this measurement, we used a sample of cerium oxide enriched in 140Ce to 99.4%. The experimental apparatus consisted of four deuterated benzene liquid scintillator detectors, which allowed us to overcome the difficulties present in the previous measurements, thanks to their very low neutron sensitivity. The accurate analysis of the p-wave resonances and the calculation of their average parameters are fundamental to improve the evaluation of the 140Ce Maxwellian-averaged cross-section.
Published: 2021

16. First results of the 140Ce(n,γ)141Ce cross-section measurement at n_TOF

Author: n_TOF Collaboration, Amaducci, Simone, Colonna, Nicola, Cosentino, Luigi, Cristallo, Sergio, Finocchiaro, Paolo, Krtička, Milan, Massimi, Cristian, Mastromarco, Mario, Mazzone, Annamaria, Mengoni, Alberto, Valenta, Stanislav, Aberle, Oliver, Alcayne, Victor, Andrzejewski, Józef, Audouin, Laurent, Babiano-Suarez, Victor, Bacak, Michael, Barbagallo, Massimo, Bennett, Samuel, Berthoumieux, Eric, Billowes, Jon, Bosnar, Damir, Brown, Adam, Busso, Maurizio, Caamaño, Manuel, Caballero-Ontanaya, Luis, Calviño, Francisco, Calviani, Marco, Cano-Ott, Daniel, Casanovas, Adria, Cerutti, Francesco, Chiaveri, Enrico, Cortés, Guillem, Cortés-Giraldo, Miguel, Damone, Lucia-Anna, Davies, Paul-John, Diakaki, Maria, Dietz, Mirco, Domingo-Pardo, Cesar, Dressler, Rugard, Ducasse, Quentin, Dupont, Emmeric, Durán, Ignacio, Eleme, Zinovia, Fernández-Domínguez, Beatriz, Ferrari, Alfredo, Furman, Valter, Göbel, Kathrin, Garg, Ruchi, Gawlik, Aleksandra, Gilardoni, Simone, Gonçalves, Isabel, González-Romero, Enrique, Guerrero, Carlos, Gunsing, Frank, Harada, Hideo, Heinitz, Stephan, Heyse, Jan, Jenkins, David, Junghans, Arnd, Käppeler, Franz, Kadi, Yacine, Kimura, Atsushi, Knapova, Ingrid, Kokkoris, Michael, Kopatch, Yuri, Kurtulgil, Deniz, Ladarescu, Ion, Lederer-Woods, Claudia, Leeb, Helmut, Lerendegui-Marco, Jorge, Lonsdale, Sarah-Jane, Macina, Daniela, Manna, Alice, Martínez, Trinitario, Masi, Alessandro, Mastinu, Pierfrancesco, Maugeri, Emilio-Andrea, Mendoza, Emilio, Michalopoulou, Veatriki, Milazzo, Paolo, Mingrone, Federica, Moreno-Soto, Javier, Musumarra, Agatino, Negret, Alexandru, Ogállar, Francisco, Oprea, Andreea, Patronis, Nikolas, Pavlik, Andreas, Perkowski, Jarosław, Piersanti, Luciano, Petrone, Cristina, Pirovano, Elisa, Porras, Ignacio, Praena, Javier, Quesada, José-Manuel, Ramos-Doval, Diego, Rauscher, Thomas, Reifarth, René, Rochman, Dimitri, Rubbia, Carlo, Sabaté-Gilarte, Marta, Saxena, Alok, Schillebeeckx, Peter, Schumann, Dorothea, Sekhar, Adhitya, Smith, Gavin, Sosnin, Nikolay, Sprung, Peter, Stamatopoulos, Athanasios, Tagliente, Giuseppe, Tain, José, Tarifeño-Saldivia, Ariel, Tassan-Got, Laurent, Thomas, Benedikt, Torres-Sánchez, Pablo, Tsinganis, Andrea, Ulrich, Jiri, Urlass, Sebastian, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vescovi, Diego, Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Woods, PhilipJohn, Wright, Tobias, Žugec, Petar, n_TOF Collaboration, Universidade de Santiago de Compostela. Departamento de Física de Partículas, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, ITA, FRA, DEU, ESP, GRC, Amaducci S., Colonna N., Cosentino L., Cristallo S., Finocchiaro P., Krticka M., Massimi C., Mastromarco M., Mazzone A., Mengoni A., Valenta S., Aberle O., Alcayne V., Andrzejewski J., Audouin L., Babiano-Suarez V., Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Billowes J., Bosnar D., Brown A., Busso M., Caamano M., Caballero-Ontanaya L., Calvino F., Calviani M., Cano-Ott D., Casanovas A., Cerutti F., Chiaveri E., Cortes G., Cortes-Giraldo M., Damone L.-A., Davies P.-J., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Ducasse Q., Dupont E., Duran I., Eleme Z., Fernandez-Dominguez B., Ferrari A., Furman V., Gobel K., Garg R., Gawlik A., Gilardoni S., Goncalves I., Gonzalez-Romero E., Guerrero C., Gunsing F., Harada H., Heinitz S., Heyse J., Jenkins D., Junghans A., Kappeler F., Kadi Y., Kimura A., Knapova I., Kokkoris M., Kopatch Y., Kurtulgil D., Ladarescu I., Lederer-Woods C., Leeb H., Lerendegui-Marco J., Lonsdale S.-J., Macina D., Manna A., Martinez T., Masi A., Mastinu P., Maugeri E.-A., Mendoza E., Michalopoulou V., Milazzo P., Mingrone F., Moreno-Soto J., Musumarra A., Negret A., Ogallar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Piersanti L., Petrone C., Pirovano E., Porras I., Praena J., Quesada J.-M., Ramos-Doval D., Rauscher T., Reifarth R., Rochman D., Rubbia C., Sabate-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J., Tarifeno-Saldivia A., Tassan-Got L., Thomas B., Torres-Sanchez P., Tsinganis A., Ulrich J., Urlass S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P.J., Wright T., Zugec P., and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: cross-section, Cerium oxide, Capture, General Physics and Astronomy, QC793-793.5, 7. Clean energy, 01 natural sciences, Ce, chemistry.chemical_compound, neutron, $^{140}$Ce, n_TOF, 010303 astronomy & astrophysics, Physics, Deuterated benzene, Elementary particle physics, nucleosynthesis, Cerium, cerium, Cosmic electrodynamics, Atomic physics, Nucleosynthesis, neutron capture, Cross-section, chemistry.chemical_element, Neutron, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 0103 physical sciences, Nuclear Physics - Experiment, ddc:530, 010306 general physics, capture, Nucleosynthesi, Ones electromagnètiques, Física [Àrees temàtiques de la UPC], Electromagnetic waves, Nuclear data, 140Ce, TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES, chemistry, 13. Climate action, s-process, MACS, Electrodinàmica còsmica
Abstract: The cerium oxide material for this measurement was provided by T. Katabuchi of the Tokyo Institute of Technology., An accurate measurement of the 140Ce(n,g) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large extent the cerium abundance in stars. The measurement was motivated by the significant difference between the cerium abundance measured in globular clusters and the value predicted by theoretical stellar models. This discrepancy can be ascribed to an overestimation of the 140Ce capture cross-section due to a lack of accurate nuclear data. For this measurement, we used a sample of cerium oxide enriched in 140Ce to 99.4%. The experimental apparatus consisted of four deuterated benzene liquid scintillator detectors, which allowed us to overcome the difficulties present in the previous measurements, thanks to their very low neutron sensitivity. The accurate analysis of the p-wave resonances and the calculation of their average parameters are fundamental to improve the evaluation of the 140Ce Maxwellian-averaged cross-section.
Published: 2021
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17. Correction of dead-time and pile-up in a detector array for constant and rapidly varying counting rates.

Author: Guerrero, C., Cano-Ott, D., Mendoza, E., and Wright, T.
Subjects: *STATISTICAL correlation, *NEUTRON capture, *COINCIDENCE circuits, *ABSORPTION, *CALORIMETERS, *CHEMICAL reactions
Abstract: The effect of dead-time and pile-up in counting experiments may become a significant source of uncertainty if not properly taken into account. Although analytical solutions to this problem have been proposed for simple set-ups with one or two detectors, these are limited when it comes to arrays where time correlation between the detector modules is used, and also in situations of variable counting rates. In this paper we describe the dead-time and pile-up corrections applied to the n_TOF Total Absorption Calorimeter (TAC), a 4 π γ-ray detector made of 40 BaF 2 modules operating at the CERN n_TOF facility. Our method is based on the simulation of the complete signal detection and event reconstruction processes and can be applied as well in the case of rapidly varying counting rates. The method is discussed in detail and then we present its successful application to the particular case of the measurement of 238 U(n, γ ) reactions with the TAC detector. [ABSTRACT FROM AUTHOR]
Published: 2015
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18. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE). H2020, Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Quesada Molina, José Manuel, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE). H2020, Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, and Quesada Molina, José Manuel
Abstract: In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed.
Published: 2020

19. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak, Michael, Aiche, Mourad, Bélier, Gilbert, Berthoumieux, Eric, Diakaki, Maria, Dupont, Emmeric, Gunsing, Frank, Kopecky, Stefan, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak, Michael, Aiche, Mourad, Bélier, Gilbert, Berthoumieux, Eric, Diakaki, Maria, Dupont, Emmeric, Gunsing, Frank, Kopecky, Stefan, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban
Abstract: In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n,gamma) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed., Postprint (published version)
Published: 2020

20. Measurement of the 154Gd(n,gamma) cross section and its astrophysical implications

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mazzoni, Alberto, Cristallo, Sergio, Aberle, O., Alcayne Aicua, Víctor, Amaducci, Simone, Andrzejewski, Józef, Audouin, Ludmila, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mazzoni, Alberto, Cristallo, Sergio, Aberle, O., Alcayne Aicua, Víctor, Amaducci, Simone, Andrzejewski, Józef, Audouin, Ludmila, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban
Abstract: The neutron capture cross section of 154Gd was measured from 1 eV to 300 keV in the experimental area located 185 m from the CERN n_TOF neutron spallation source, using a metallic sample of gadolinium, enriched to 67% in 154Gd. The capture measurement, performed with four C6D6 scintillation detectors, has been complemented by a transmission measurement performed at the GELINA time-of-flight facility (JRC-Geel), thus minimising the uncertainty related to sample composition. An accurate Maxwellian averaged capture cross section (MACS) was deduced over the temperature range of interest for s process nucleosynthesis modelling. We report a value of 880(50) mb for the MACS at keV, significantly lower compared to values available in literature. The new adopted 154Gd(n,¿) cross section reduces the discrepancy between observed and calculated solar s-only isotopic abundances predicted by s-process nucleosynthesis models., Postprint (published version)
Published: 2020

21. First results of the140ce(N,ү)141ce cross-section measurement at n_tof

Author: Amaducci, Simone, Colonna, Nicola, Cosentino, Luigi, Cristallo, Sergio, Finocchiaro, Paolo, Krticka, Milan, Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Moreno Soto, Javier, Quesada Molina, José Manuel, Sabaté Gilarte, Marta, Žugec, P., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Tokyo Institute of Technology
Subjects: Cross-section, N_TOF, Capture, MACS, 140 Ce, S-process, Cerium, Neutron, Nucleosynthesis
Abstract: An accurate measurement of the140Ce(n,ү) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large extent the cerium abundance in stars. The measurement was motivated by the significant difference between the cerium abundance measured in globular clusters and the value predicted by theoretical stellar models. This discrepancy can be ascribed to an overestimation of the140Ce capture cross-section due to a lack of accurate nuclear data. For this measurement, we used a sample of cerium oxide enriched in140Ce to 99.4%. The experimental apparatus consisted of four deuterated benzene liquid scintillator detectors, which allowed us to overcome the difficulties present in the previous measurements, thanks to their very low neutron sensitivity. The accurate analysis of the p-wave resonances and the calculation of their average parameters are fundamental to improve the evaluation of the140Ce Maxwellian-averaged cross-section. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Published: 2021

22. Radiative Neutron Capture Cross-Section Measurement of Ge Isotopes at n_TOF CERN Facility and Its Importance for Stellar Nucleosynthesis

Author: M. Bacak, A. Musumarra, P. J. Woods, T. Glodariu, N. Patronis, A. Pavlik, Roberto Losito, Rene Reifarth, Stefan Schmidt, Cortés-Giraldo, J. M. Quesada, L. Tassan-Got, Tanja Heftrich, A. Riego-Perez, S.L. Meo, A. K. Saxena, Arnaud Ferrari, C. Domingo-Pardo, L. Audouin, G. Vannini, P. C. Rout, L. Cosentino, E. Dupont, J. Billowes, S. Montesano, Tatsuya Katabuchi, A. Stamatopoulos, S. Barros, A. Mengoni, K. Rajeev, M. Caamaño, Petar Žugec, A. Kimura, Rugard Dressler, Francesca Matteucci, D. G. Jenkins, Emilio Andrea Maugeri, A. Tsinganis, P. Kavrigin, Nicola Colonna, M. Kokkoris, Mario Barbagallo, A. Oprea, Vasilis Vlachoudis, I. Knapova, V. Ketlerov, G. Tagliente, G. Cortes, Ralf Nolte, P. Vaz, B. Fernández-Domínguez, F. Käppeler, E. Griesmayer, Kathrin Göbel, Alberto Ventura, A. Casanovas, A. Goverdovski, O. Aberle, L. A. Damone, D. Bosnar, Jan Heyse, J. I. Porras, A. R. García, U. Battino, M. Brugger, A. Tattersall, V. Furman, T. J. Wright, F. Cerutti, C. Beinrucker, R. Vlastou, I. Duran, E. Leal-Cidoncha, E. Berthoumieux, A. Gawlik, Thomas Rauscher, D. Cano-Ott, M. Diakaki, E. González-Romero, R. Cardella, Javier Praena, F. Bečvář, C. Wolf, E. Mendoza, Peter Schillebeeckx, V. Bécares, E. Jericha, Paolo Finocchiaro, F. Gunsing, Dorothea Schumann, J. A. Ryan, Cristian Massimi, Pedro G. Ferreira, Mario Weigand, M. Krtička, M. Mirea, F. Calviño, H. Leeb, J. Perkowski, T. Martinez, Ariel Tarifeño-Saldivia, S. J. Lonsdale, J. Lerendegui-Marco, S. Heinitz, V. Khryachkov, E. Chiaveri, P. F. Mastinu, P. M. Milazzo, Y. H. Chen, I. F. Gonçalves, M. Sabaté-Gilarte, S. Warren, V. Variale, M. Mastromarco, Anton Wallner, J. Balibrea, D. M. Castelluccio, Hideo Harada, D. Macina, Carlos Guerrero, Claudia Lederer-Woods, P. V. Sedyshev, F. Mingrone, J. Andrzejewski, C. Rubbia, J. L. Tain, Niko Kivel, C. Weiss, Y. Kadi, S. Valenta, Marco Calviani, A. G. Smith, M. Dietz, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), n_TOF, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Astrofísica, Astrophysics and Astronomy, Isotopes of germanium, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, 7. Clean energy, Nuclear physics, Stellar nucleosynthesis, Isotopes, Nucleosynthesis, CERN, Neutron cross section, Neutron, Nuclear Physics - Experiment, n_TOF, Nuclear Experiment, Stellar activity, Physics, Física [Àrees temàtiques de la UPC], Neutron temperature, Neutron capture cross-section, Neutron capture, Activitat estelar, chemistry, Neutron time-of-flight, MACS, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], radiative neutron capture, Ge isotopes, n_TOF, stellar nucleosynthesis
Abstract: This work was supported by the Austrian Science Fund FWF (J3503), the Adolf Messer Foundation (Germany), the UK Science and Facilities Council (ST/M006085/1), and the European Research Council ERC-2015-StG No. 677497. We also acknowledge the support of the National Science Centre, Poland, under the grant UMO-2016/22/M/ST2/00183, the MSMT of the Czech Republic and the Croatian Science Foundation under the project IP-2018-01-8570., This manuscript summarizes the results of radiative neutron capture cross-section measurements on two stable germanium isotopes, Ge-70 and Ge-73. Experiments were performed at the n_TOF facility at CERN via the time-of-flight technique, over a wide neutron energy range, for all stable germanium isotopes (70,72,73,74, and 76). Results for Ge-70 [Phys. Rev. C 100, 045804 (2019)] and Ge-73 [Phys. Lett. B 790, 458 (2019)] are already published. In the field of nuclear structure, such measurements allow to study excited levels close to the neutron binding energy and to obtain information on nuclear properties. In stellar nucleosynthesis research, neutron induced reactions on germanium are of importance for nucleosynthesis in the weak component of the slow neutron capture processes., Austrian Science Fund (FWF) J3503, Adolf Messer Foundation (Germany), UK Science and Facilities Council ST/M006085/1, European Research Council (ERC), European Commission 677497, National Science Centre, Poland UMO-2016/22/M/ST2/00183, Ministry of Education, Youth & Sports - Czech Republic, Croatian Science Foundation IP-2018-01-8570
Published: 2021
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23. Pulse pile-up and dead time corrections for digitized signals from a BaF2 calorimeter.

Author: Mendoza, E., Cano-Ott, D., Guerrero, C., and Berthoumieux, E.
Subjects: *PILE-up (Spectrometry), *DIGITAL signal processing, *BARIUM compounds, *CALORIMETERS, *ABSORPTION, *NITROGEN
Abstract: The pulse pile-up and associated dead time effects in an 243 Am(n, γ ) cross section measurement with a BaF 2 Total Absorption Calorimeter at the CERN n_TOF facility have been characterized. In this case, reliable corrections of these effects are crucial because of the complex detector configuration and of the high count rate induced by the sample activity of 50 MBq. The techniques, which have been developed for offline processing of the present data, may be of general interest for the analysis of other experiments using digital acquisition systems. [ABSTRACT FROM AUTHOR]
Published: 2014
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24. GEANT4 simulation of the neutron background of the C6D6 set-up for capture studies at n_TOF.

Author: Žugec, P., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., and Chiaveri, E.
Subjects: *NEUTRONS, *SIMULATION methods & models, *COMPUTER software, *PULSE height analyzers, *PHYSICS experiments, *NUCLEAR cross sections
Abstract: Abstract: The neutron sensitivity of the C6D6 detector setup used at n_TOF facility for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software replica of the entire n_TOF experimental hall, including the neutron beam line, sample, detector supports and the walls of the experimental area has been implemented in the simulations. The simulations have been analyzed in the same manner as experimental data, in particular by applying the Pulse Height Weighting Technique. The simulations have been validated against a measurement of the neutron background performed with a natC sample, showing an excellent agreement above 1keV. At lower energies, an additional component in the measured natC yield has been discovered, which prevents the use of natC data for neutron background estimates at neutron energies below a few hundred eV. The origin and time structure of the neutron background have been derived from the simulations. Examples of the neutron background for two different samples are demonstrating the important role of accurate simulations of the neutron background in capture cross-section measurements. [Copyright &y& Elsevier]
Published: 2014
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25. Measurement of the α ratio and (n, γ) cross section of 235U from 0.2 to 200 eV at n_TOF

Author: Balibrea-Correa, J., Mendoza, E., Cano-Ott, D., González, E., Capote, R., Krtička, M., Altstadt, S., Andrzejewski, J., Audouin, L., Bécares, V., Barbagallo, M., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Colonna, N., Cortés, G., Cortés-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Durán, I., Eleftheriadis, C., Ferrari, A., Fraval, K., Furman, V., Göbel, K., Gómez-Hornillos, M. B., Ganesan, S., García, A. R., Giubrone, G., Gonçalves, I. F., Goverdovski, A., Griesmayer, E., Guerrero, C., Gunsing, F., Heftrich, T., Hernández-Prieto, A., Heyse, J., Jenkins, D. G., Jericha, E., Käppeler, F., Kadi, Y., Karadimos, D., Katabuchi, T., Ketlerov, V., Khryachkov, V., Kivel, N., Koehler, P., Kokkoris, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L. S., Lerendegui-Marco, J., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P., Mastromarco, M., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondelaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A. J. M., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego-Perez, A., Robles, M., Rubbia, C., Ryan, J. A., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Sedyshev, P., Tagliente, G., Tain, J. L., Tarifeño-Saldivia, A., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiss, C., Wright, T., and Žugec, P.
Subjects: PRIRODNE ZNANOSTI. Fizika, α ratio, 235U, Physics, ddc:530, n_TOF, neutron time of flight, NATURAL SCIENCES. Physics
Abstract: We measured the neutron capture-to-fission cross-section ratio (α ratio) and the capture cross section of $^{235}$U between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF$_{2}$ Total Absorption Calorimeter (TAC), used for detection of γ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the $^{6}$Li(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the $^{235}$U(n,f) cross section between 7.8 and 11 eV was then used for its absolute normalization. The α ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of $^{235}$U performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV.
Published: 2020
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26. Measurement of the 154Gd(n,γ) cross section and its astrophysical implications

Author: Z. Talip, A. S. Brown, J. Lerendegui-Marco, S. Amaducci, Alexandru Negret, P. Vaz, F. Käppeler, A. Masi, R. Wynants, Alberto Ventura, D. G. Jenkins, M. Sabaté-Gilarte, E. Mendoza, A. Kimura, G. Vannini, O. Aberle, V. Babiano-Suarez, Stefan Kopecky, A. Manna, A. Pavlik, A. Stamatopoulos, M. Diakaki, M. Mastromarco, C. Domingo-Pardo, V. Variale, Dimitri Rochman, S. Heinitz, M. A. Cortés-Giraldo, Z. Eleme, Emilio Andrea Maugeri, M. Kokkoris, Anton Wallner, D. Macina, B. Fernández-Domíngez, E. Jericha, S. Urlass, Mario Barbagallo, Alfredo Ferrari, Paolo Finocchiaro, Maurizio Busso, G. Alaerts, A. Oprea, J. Heyse, D. M. Castelluccio, R. Mucciola, F. Calviño, D. Schumann, Ariel Tarifeño-Saldivia, S. J. Lonsdale, A. Musumarra, G. Cortes, E. Chiaveri, D. Cano-Ott, I. Ferro-Gonçalves, P. M. Milazzo, Ignacio Porras, Rene Reifarth, Giulia Clai, S. Valenta, A. Gawlik, N. Patronis, P. Schillebeeckx, Javier Praena, S. Lo Meo, Carlos Guerrero, J. Perkowski, P. Torres-Sánchez, F. Bečvář, A. Saxena, Marco Calviani, Alberto Mengoni, I. Ladarescu, A. G. Smith, R. Garg, J. Billowes, J. M. Quesada, E. González-Romero, L. Tassan-Got, F. Gunsing, Francesca Matteucci, I. Duran, M. Dietz, Diego Vescovi, Sergio Cristallo, F. Mingrone, J. Andrzejewski, Cristian Massimi, Philip Woods, V. Bécares, L. Caballero, Claudia Lederer-Woods, R. Dressler, V. Vlachoudis, R. Vlastou, Ralf Nolte, M. Caamaño, Deniz Kurtulgil, L. A. Damone, Damir Bosnar, Y. Kadi, K. Göbel, F. Cerutti, V. Alcayne, T. Wright, V. Furman, Y. Kopatch, N. V. Sosnin, Simone Gilardoni, Annamaria Mazzone, Petar Žugec, J. Ulrich, D. Radeck, E. Berthoumieux, J. L. Tain, Niko Kivel, G. Bellia, F. Ogállar, Y. H. Chen, C. Rubbia, G. Tagliente, D. Ramos Doval, A. Casanovas, L. Cosentino, P. F. Mastinu, M. Krtička, T. Martinez, A. Tsinganis, Luciano Piersanti, Nicola Colonna, E. Dupont, M. Bacak, T. Glodariu, L. Audouin, V. Michalopoulou, ITA, GBR, FRA, DEU, ESP, AUT, BEL, HRV, JPN, GRC, IND, POL, CZE, CHE, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Mazzone, A., Cristallo, S., Aberle, O., Alaerts, G., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Babiano-Suarez, V., Bacak, M., Barbagallo, M., Becares, V., Becvar, F., Bellia, G., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A. S., Busso, M., Caamano, M., Caballero, L., Calviani, M., Calvino, F., Cano-Ott, D., Casanovas, A., Castelluccio, D. M., Cerutti, F., Chen, Y. H., Chiaveri, E., Clai, G., Colonna, N., Cortes, G. P., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dressler, R., Dupont, E., Duran, I., Eleme, Z., Fernandez-Domingez, B., Ferrari, A., Ferro-Goncalves, I., Finocchiaro, P., Furman, V., Garg, R., Gawlik, A., Gilardoni, S., Glodariu, T., Gobel, K., Gonzalez-Romero, E., Guerrero, C., Gunsing, F., Heinitz, S., Heyse, J., Jenkins, D. G., Jericha, E., Kadi, Y., Kappeler, F., Kimura, A., Kivel, N., Kokkoris, M., Kopatch, Y., Kopecky, S., Krticka, M., Kurtulgil, D., Ladarescu, I., Lederer-Woods, C., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. -J., Macina, D., Manna, A., Martinez, T., Masi, A., Massimi, C., Mastinu, P. F., Mastromarco, M., Matteucci, F., Maugeri, E., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Mucciola, R., Musumarra, A., Negret, A., Nolte, R., Ogallar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Piersanti, L., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Ramos Doval, D., Reifarth, R., Rochman, D., Rubbia, C., Sabate-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Smith, A. G., Sosnin, N., Stamatopoulos, A., Tagliente, G., Tain, J. L., Talip, Z., Tarifeno-Saldivia, A. E., Tassan-Got, L., Torres-Sanchez, P., Tsinganis, A., Ulrich, J., Urlass, S., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wynants, R., Wright, T. J., Zugec, P., Mazzone A., Cristallo S., Aberle O., Alaerts G., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V., Bacak M., Barbagallo M., Becares V., Becvar F., Bellia G., Berthoumieux E., Billowes J., Bosnar D., Brown A.S., Busso M., Caamano M., Caballero L., Calviani M., Calvino F., Cano-Ott D., Casanovas A., Castelluccio D.M., Cerutti F., Chen Y.H., Chiaveri E., Clai G., Colonna N., Cortes G.P., Cortes-Giraldo M.A., Cosentino L., Damone L.A., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Duran I., Eleme Z., Fernandez-Domingez B., Ferrari A., Ferro-Goncalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Glodariu T., Gobel K., Gonzalez-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D.G., Jericha E., Kadi Y., Kappeler F., Kimura A., Kivel N., Kokkoris M., Kopatch Y., Kopecky S., Krticka M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lo Meo S., Lonsdale S.-J., Macina D., Manna A., Martinez T., Masi A., Massimi C., Mastinu P.F., Mastromarco M., Matteucci F., Maugeri E., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P.M., Mingrone F., Mucciola R., Musumarra A., Negret A., Nolte R., Ogallar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Piersanti L., Porras I., Praena J., Quesada J.M., Radeck D., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabate-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Smith A.G., Sosnin N., Stamatopoulos A., Tagliente G., Tain J.L., Talip Z., Tarifeno-Saldivia A.E., Tassan-Got L., Torres-Sanchez P., Tsinganis A., Ulrich J., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P.J., Wynants R., Wright T.J., and Zugec P.
Subjects: Nuclear and High Energy Physics, Gd, Neutron time of flight, Física::Física de partícules [Àrees temàtiques de la UPC], Nuclear physics, Neutrons--Captura, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Neutron time of flightn, 01 natural sciences, 7. Clean energy, Neutrons--Capture, Cross section (physics), Nucleosynthesis, ComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION, 0103 physical sciences, Neutron cross section, ddc:530, Nuclear Physics - Experiment, Spallation, Neutron, n_TOF, Nuclear Experiment, 010306 general physics, 154Gd, Physics, Scintillation, 154 Gd, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, s process, Atmospheric temperature range, lcsh:QC1-999, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, Neutron time-of-flight, Física nuclear, s-process, lcsh:Physics
Abstract: The isotope used in this research was supplied by the United States Department of Energy Office of Science by the Isotope Program in the Office of Nuclear Physics., The neutron capture cross section of 154Gd was measured from 1 eV to 300 keV in the experimental area located 185 m from the CERN n_TOF neutron spallation source, using a metallic sample of gadolinium, enriched to 67% in 154Gd. The capture measurement, performed with four C6D6 scintillation detectors, has been complemented by a transmission measurement performed at the GELINA time-of-flight facility (JRC-Geel), thus minimising the uncertainty related to sample composition. An accurate Maxwellian averaged capture cross section (MACS) was deduced over the temperature range of interest for s process nucleosynthesis modelling. We report a value of 880(50) mb for the MACS at kT = 30 keV, significantly lower compared to values available in literature. The new adopted 154Gd(n,γ ) cross section reduces the discrepancy between observed and calculated solar s-only isotopic abundances predicted by s-process nucleosynthesis models., EUFRAT open access programme of the Joint Research Centre at Geel
Published: 2020
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27. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author: D. Macina, A. Musumarra, K. Göbel, M. Sabaté-Gilarte, E. Mendoza, A. Oprea, I. Knapova, N. V. Sosnin, T. Wright, J. Heyse, Rene Reifarth, N. Kivel, R. Nolte, L. Cosentino, J. Marganiec, P. F. Mastinu, P. Vaz, F. Bečvář, Annamaria Mazzone, Petar Žugec, M. Aiche, I. Duran, Stefan Kopecky, A. Saxena, A. Kimura, Alberto Ventura, G. Vannini, S. Valenta, Nicola Colonna, M. Kokkoris, M. A. Cortés-Giraldo, P. M. Milazzo, R. Dressler, P. Kavrigin, E. Dupont, Carlos Guerrero, G. Sibbens, M. Mastromarco, Marco Calviani, B. Laurent, E. González-Romero, P. Ferreira, Mario Barbagallo, L. Audouin, M. Krtička, A. Pavlik, A. G. Smith, J. Billowes, D. Schumann, E. Griesmayer, Anton Wallner, Alexandru Negret, G. Cortes, C. Domingo-Pardo, G. Tagliente, M. Bacak, L. A. Damone, F. Käppeler, J. Balibrea, Philip Woods, O. Aberle, D. Vanleeuw, F. Mingrone, J. Andrzejewski, F. Calviño, H. Leeb, E. A. Maugeri, A. Kalamara, T. Martinez, C. Weiss, R. Vlastou, Olivier Serot, Carlo Rubbia, V. Vlachoudis, J. Perkowski, M. Diakaki, D. Radeck, Alfredo Ferrari, E. Berthoumieux, Stephan Richter, P. Schillebeeckx, S. Warren, F. Gunsing, A. Masi, Damir Bosnar, Y. Kadi, A. Manna, Hideo Harada, Deniz Kurtulgil, V. Variale, D. G. Jenkins, Y. H. Chen, Cristian Massimi, P. V. Sedyshev, G. Belier, S. Heinitz, V. Furman, A. Stamatopoulos, E. Chiaveri, D. Cano-Ott, A. S. Brown, A. Casanovas, C. Lederer, E. Jericha, T. Glodariu, Paolo Finocchiaro, J. M. Quesada, L. Tassan-Got, A. Moens, J. A. Ryan, S. Amaducci, Simone Gilardoni, R. Cardella, Javier Praena, S. Lo Meo, M. Caamaño, F. Cerutti, B. Fernández-Domínguez, J. L. Tain, J. Taieb, L. Mathieu, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, A. R. García, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, J. Lerendegui-Marco, I. F. Gonçalves, N. Patronis, Alberto Mengoni, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Bacak, M., Aiche, M., Belier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Gunsing, F., Heyse, J., Kopecky, S., Laurent, B., Leeb, H., Mathieu, L., Moens, A., Richter, S., Schillebeeckx, P., Serot, O., Sibbens, G., Taieb, J., Vanleeuw, D., Vlachoudis, V., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Balibrea, J., Barbagallo, M., Becvar, F., Billowes, J., Bosnar, D., Brown, A., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Colonna, N., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Domingo-Pardo, C., Dressler, R., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Gobel, K., Garcia, A. R., Gawlik, A., Gilardoni, S., Glodariu, T., Goncalves, I. F., Gonzalez-Romero, E., Griesmayer, E., Guerrero, C., Harada, H., Heinitz, S., Jenkins, D. G., Jericha, E., Kappeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Knapova, I., Kokkoris, M., Krticka, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer, C., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. J., Macina, D., Manna, A., Marganiec, J., Martinez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Rauscher, T., Reifarth, R., Rubbia, C., Ryan, J. A., Sabate-Gilarte, M., Saxena, A., Schumann, D., Sedyshev, P., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P. J., Wright, T., Zugec, P., Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak M., Aiche M., Belier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Laurent B., Leeb H., Mathieu L., Moens A., Richter S., Schillebeeckx P., Serot O., Sibbens G., Taieb J., Vanleeuw D., Vlachoudis V., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Becvar F., Billowes J., Bosnar D., Brown A., Caamano M., Calvino F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y.H., Chiaveri E., Colonna N., Cortes G., Cortes-Giraldo M.A., Cosentino L., Damone L.A., Domingo-Pardo C., Dressler R., Duran I., Fernandez-Dominguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Gobel K., Garcia A.R., Gawlik A., Gilardoni S., Glodariu T., Goncalves I.F., Gonzalez-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D.G., Jericha E., Kappeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krticka M., Kurtulgil D., Leal-Cidoncha E., Lederer C., Lerendegui-Marco J., Lo Meo S., Lonsdale S.J., Macina D., Manna A., Marganiec J., Martinez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E.A., Mazzone A., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J.M., Radeck D., Rauscher T., Reifarth R., Rubbia C., Ryan J.A., Sabate-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A.G., Sosnin N.V., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeno-Saldivia A., Tassan-Got L., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlastou R., Wallner A., Warren S., Weiss C., Woods P.J., Wright T., and Zugec P.
Subjects: Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Nuclear Theory, Física::Física de partícules [Àrees temàtiques de la UPC], Nuclear physics, Context (language use), Neutrons--Captura, 01 natural sciences, 7. Clean energy, Neutrons--Capture, 0103 physical sciences, Physics::Atomic and Molecular Clusters, 233 U, ddc:530, n_TOF, 010306 general physics, Nuclear Experiment, Instrumentation, Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, [PHYS]Physics [physics], Fission detector, 233U, Time-of-flight, Física [Àrees temàtiques de la UPC], Fissile material, 010308 nuclear & particles physics, Detector, Neutron radiation, Fast fission, NATURAL SCIENCES. Physics, Calorimeter, PRIRODNE ZNANOSTI. Fizika, Neutron capture, 13. Climate action, Física nuclear, Other
Abstract: In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ��) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed., This work was partially supported by the French NEEDS/NACRE Project and by the European Commission within HORIZON2020 via the EURATOM Project EUFRAT.
Published: 2020
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28. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author: Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Quesada Molina, José Manuel, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and European Union (UE). H2020
Subjects: 233U, Time-of-flight, Fission detector, n_TOF
Abstract: In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed. French NEEDS/NACRE Project European Commission within HORIZON2020 via the EURATOM Project EUFRAT
Published: 2020

29. Measurement of the 16O(n, alpha)13C cross-section using a Double Frisch Grid Ionization Chamber

Author: Urlaß, S., Beyer, R., Hammer, S., Hartmann, A., Junghans, A., Kögler, T., Lutz, B., Mingrone, F., Müller, S., Römer, K., Scheibler, D., Stach, D., Szücs, T., Tassan-Got, L., Turkat, S., Wagner, A., and Weinberger, D.
Subjects: n_alpha, nELBE, ND2019, 16O, n_TOF, O-16, oxygen
Abstract: The 16O(n,alpha)13C reaction was proposed to be measured at the neutron time-of-flight (n_TOF) facility of CERN. To this purpose, a Double Frisch Grid Ionization Chamber (DFGIC) containing the oxygen atoms as a component in the counting gas coupled with a switch device in order to prevent the charge collection from the so-called gamma-flash has been developed at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), in Germany. The first 16O(n, alpha)13C measurement without seeing the charge of the γ-flash at n_TOF has been performed in November 2018. After the electronics did not suffer from the gamma-flash any more, another huge charge collection was discovered. Due to the high instantaneous flux at the n_TOF facility the amount of that induced charge from neutron induced background reactions was piling up so much that the recognition of 16O(n, alpha)13C reactions from that background was very difficult. For that reason another 16O(n, alpha)13C measurement at the time-of-flight facility nELBE at HZDR which has a low instantaneous flux, has been performed in April 2019. Both measurements from n_TOF and nELBE will be presented here.
Published: 2020

30. A new CVD diamond mosaic-detector for (n, ) cross-section measurements at the n_TOF experiment at CERN.

Author: Weiß, C., Griesmayer, E., Guerrero, C., Altstadt, S., Andrzejewski, J., Audouin, L., Badurek, G., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., and Carrapiço, C.
Subjects: *CHEMICAL vapor deposition, *SINGLE crystals, *NUCLEAR cross sections, *DIAMOND crystals, *DIODES, *NUCLEAR counters, *NUCLEAR reactions
Abstract: Abstract: At the n_TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n, ) 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 59Ni(n, )56Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented. [Copyright &y& Elsevier]
Published: 2013
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31. MICROMEGAS FOR NEUTRON DETECTION AND IMAGING.

Author: BELLONI, F., GUNSING, F., and PAPAEVANGELOU, T.
Subjects: *NEUTRON counters, *NUCLEAR fusion, *GAS detectors, *IMAGING systems, *PARTICLES (Nuclear physics), *NUCLEAR reactors, *COMPUTED tomography
Abstract: Micromegas-based detectors are used in a wide variety of neutron experiments. Their fast response meets the needs of time-of-flight facilities in terms of time resolution. The possibility of constructing low mass Micromegas detectors makes them appropriate for beam imaging and monitoring without affecting the beam quality or inducing background in parallel measurements. The good particle discrimination capability allows using Micromegas for neutron induced fission and (n, α) cross-section measurements. Their high radiation resistance make them suitable for working as flux monitors in the core of fission nuclear reactors as well as in the proximity of fusion chambers. New studies underlined the possibility of performing neutron computed tomography (CT) with Micromegas as neutron detectors, but also of exploiting its performances in experiments of fundamental nuclear physics. [ABSTRACT FROM AUTHOR]
Published: 2013
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32. Measurement of 73Ge(n,γ) cross sections and implications for stellar nucleosynthesis

Author: Universidad de Sevilla. Departamento de Ingeniería Electrónica, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. TIC192: Ingeniería Electrónica, Lederer-Woods, Claudia, Battino, Umberto, Ferreira, Paulo N., Guerrero, Carlos, Lerendegui Marco, Jorge, Cortés Giraldo, Miguel Antonio, Palomo Pinto, Rogelio, Quesada Molina, José Manuel, Sabaté Gilarte, Marta, Universidad de Sevilla. Departamento de Ingeniería Electrónica, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. TIC192: Ingeniería Electrónica, Lederer-Woods, Claudia, Battino, Umberto, Ferreira, Paulo N., Guerrero, Carlos, Lerendegui Marco, Jorge, Cortés Giraldo, Miguel Antonio, Palomo Pinto, Rogelio, Quesada Molina, José Manuel, and Sabaté Gilarte, Marta
Abstract: 73Ge(n,γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar cross section at kT=30 keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73Ge produced in stars, which would explain the low isotopic abundance of 73Ge in the solar system.
Published: 2019

33. Measurement of the 235U(n, f) cross section relative to the 6Li(n, t) and 10B(n, a) standards from thermal to 170 keV neutron energy range at n_TOF

Author: Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Amaducci, Simone, Cosentino, Luigi, Barbagallo, Massimo, Casanovas Hoste, Adrià, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Amaducci, Simone, Cosentino, Luigi, Barbagallo, Massimo, Casanovas Hoste, Adrià, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban
Abstract: The 235U(n, f ) cross section was measured at n_TOF relative to 6Li(n, t) and 10B(n,a) , with high resolution ( L=183.49(2) m) and in a wide energy range (25meV-170keV) with 1.5% systematic uncertainty, making use of a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the yields of the 235U(n, f ) and of the two reference reactions under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10-30keV neutron energy range had been previously observed in other experiments, indicating a cross section systematically lower by several percent relative to major evaluations. The present results indicate that the cross section in the 9-18keV neutron energy range is indeed overestimated by almost 5% in the recently released evaluated data files ENDF/B-VIII.0 and JEFF3.3, as a consequence of a 7% overestimate in a single GMA node in the IAEA reference file. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The results here reported may lead to a reduction of the uncertainty in the 1-100keV neutron energy region. Finally, from the present data, a value of 249.7±1.4(stat)±0.94(syst) b·eV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247.5±3 b·eV recently established as a standard., Postprint (published version)
Published: 2019

34. Preliminary results on the 233U capture cross section and alpha ratio measured at n_TOF (CERN) with the fission tagging technique

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak, M., Aiche, Mourad, Bélier, Gilbert, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak, M., Aiche, Mourad, Bélier, Gilbert, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban
Abstract: 233U is of key importance among the fissile nuclei in the Th-U fuel cycle. A particularity of 233U is its small neutron capture cross-section, which is on average about one order of magnitude lower than the fission cross-section.The accuracy in the measurement of the 233U capture cross-section depends crucially onan efficient capture-fission discrimination, thus a combined set-up of fission and ¿-detectors is needed. A measurement of the 233U capture cross-section and capture-to-fissionratio was performed at the CERN n_TOF facility. The Total Absorption Calorimeter (TAC) of n_TOF was employed as ¿-detector coupled with a novel compact ionization chamber as fission detector. A brief description of the experimental set-up will be given, and essential parts of the analysis procedure as well as the preliminary response of the set-up to capture are presented and discussed, Postprint (published version)
Published: 2019

35. On the use of stacks of fission-like targets for neutron capture experiments

Author: Ministerio de Economía y Competitividad (España), European Commission, Universidad de Sevilla, Guerrero, C., Lerendegui-Marco, J., Eberhardt, K., Düllmann, C.E., Junghans, A. R., Lommel, B., Mokry, C., Quesada, José Manuel, Runke, J., Thörle-Pospiech, P., n_TOF Collaboration, Ministerio de Economía y Competitividad (España), European Commission, Universidad de Sevilla, Guerrero, C., Lerendegui-Marco, J., Eberhardt, K., Düllmann, C.E., Junghans, A. R., Lommel, B., Mokry, C., Quesada, José Manuel, Runke, J., Thörle-Pospiech, P., and n_TOF Collaboration
Abstract: The measurement of neutron induced reactions on unstable isotopes is of interest in many fields, from nuclear energy to astrophysics or applications; in particular transuranic isotopes are essential for the development of innovative nuclear reactors and for the management of the radioactive waste. In such measurements, the quality of the associated radioactive target is crucial for the success of the experiment, but in many cases the geometry, amount of mass and encapsulation of the target are not optimal, leading to limited results. In this work we propose to produce high quality radioactive targets for capture as a stack of thin targets using the techniques usually employed for fission measurements. In particular, we have succeeded in making a 242Pu target of nearly 100 mg by combining seven thin (1 mg/cm2) fission-like targets with 45 mm in diameter achieving a total backing thickness of only of aluminum. The target has been shown to perform successfully in experiments at both a neutron time-of-flight facility (n_TOF at CERN) and a thermal neutron beam (BRR at KFKI), providing the most accurate data from thermal up to 500 keV to date.
Published: 2019

36. Measurement of the 235U(n,f) cross section relative to the 6Li(n,t) and 10B(n,a) standards from thermal to 170 keV neutron energy range at n_TOF

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Amaducci, Simone, Cosentino, Luigi, Barbagallo, Massimo, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Tarifeño Saldivia, Ariel Esteban, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Amaducci, Simone, Cosentino, Luigi, Barbagallo, Massimo, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Tarifeño Saldivia, Ariel Esteban, and Cortés Rossell, Guillem Pere
Abstract: The 235U(n,f) cross section was measured in a wide energy range at n_TOF relative to 6Li(n,t) and 10B(n,alpha), with high resolution and in a wide energy range, with a setup based on a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the reaction yields under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10÷30 keV neutron energy range had been previously observed in other experiments, indicating a cross section systematically lower by several percent relative to major evaluations. The present results indicate that the evaluated cross section in the 9÷18 keV neutron energy range is indeed overestimated, both in the recent updates of ENDF/B-VIII.0 and of the IAEA reference data. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The new, high accuracy results here reported may lead to a reduction of the uncertainty in the 1÷100 keV neutron energy region. Finally, the present data provide additional confidence on the recently re-evaluated cross section integral between 7.8 and 11 eV., Preprint
Published: 2019

37. Fission program at n_TOF

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tassan Got, Laurence, Colonna, Nicola, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Tarifeño Saldivia, Ariel Esteban, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tassan Got, Laurence, Colonna, Nicola, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Tarifeño Saldivia, Ariel Esteban, and Cortés Rossell, Guillem Pere
Abstract: Since its start in 2001 the n_TOF collaboration developed a measurement program on fission, in view of advanced fuels in new generation reactors. A special effort was made on measurement of cross sections of actinides, exploiting the peculiarity of the n_TOF neutron beam which spans a huge energy domain, from the thermal region up to GeV. Moreover fission fragment angular distributions have also been measured. An overview of the cross section results achieved with different detectors is presented, including a discussion of the 237Np case where discrepancies showed up between different detector systems. The results on the anisotropy of the fission fragments and its implication on the mechanism of neutron absorption, and in applications, are also shown., Postprint (published version)
Published: 2019

38. Measurement of the 244Cm and 246Cm neutron-induced capture cross sections at the n_TOF facility

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Alcayne Aicua, Víctor, Mendoza Cembranos, Emilio, Kimura, Atsushi, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Alcayne Aicua, Víctor, Mendoza Cembranos, Emilio, Kimura, Atsushi, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban
Abstract: The neutron capture reactions of the 244Cm and 246Cm isotopes open the path for the formation of heavier Cm isotopes and heavier elements such asThe neutron capture reactions of the 244Cm and 246Cm isotopes open the path for the formation of heavier Cm isotopes and heavier elements such as Bk and Cf in a nuclear reactor. In addition, both isotopes belong to the minor actinides with a large contribution to the decay heat and to the neutron emission in irradiated fuels. There are only two previous 244Cm and 246Cm capture cross section measurements: one in 1969 using a nuclear explosion and the most recent data measured at J-PARC in 2010. The data for both isotopes are very scarce due to the difficulties in performing the measurements: high intrinsic activity of the samples and limited facilities capable of providing isotopically enriched samples. We have measured both neutron capture cross sections at the n_TOF Experimental Area 2 (EAR-2) with three C6D6 detectors and also at Area 1 (EAR-1) with the TAC. Preliminary results assessing the quality and limitations (background subtraction, measurement technique and counting statistics) of this new experimental datasets are presented and discussed. Bk and Cf in a nuclear reactor. In addition, both isotopes belong to the minor actinides with a large contribution to the decay heat and to the neutron emission in irradiated fuels. There are only two previous 244Cm and 246Cm capture cross section measurements: one in 1969 using a nuclear explosion and the most recent data measured at J-PARC in 2010. The data for both isotopes are very scarce due to the difficulties in performing the measurements: high intrinsic activity of the samples and limited facilities capable of providing isotopically enriched samples. We have measured both neutron capture cross sections at the n_TOF Experimental Area 2 (EAR-2) with three C6D6 detectors and also at Area 1 (EAR-1) with the TAC. Preliminary results assessing the quality and limitations (bac, Postprint (published version)
Published: 2019

39. Analysis of the FIC detector data at the n_TOF facility.

Author: Karadimos, D., Vlastou, R., Ioannides, K., Assimakopoulos, P., Tsagas, N., Pavlopoulos, P., Karamanis, D., Papachristodoulou, C., Stamoulis, K., Vlachoudis, V., Cennini, P., Ketlerov, V., and Konovalov, V.
Subjects: *IONIZATION chambers, *NUCLEAR counters, *TIME-of-flight mass spectrometry, *FISSION cross sections, *ANALOG-to-digital converters, *NUCLEAR energy
Abstract: Abstract: Fission cross-section measurements with the Fast Ionization Chamber (FIC) at the CERN n_TOF facility were challenged by intense signals due to γ-rays and ultra-relativistic particles from the impact of the 20GeV proton pulses on the neutron spallation target. A method for analyzing the data taken with Flash Analog to Digital Converters (FADC) was developed to treat these problems in an automated way to provide a reliable background subtraction and a fit routine for identifying fission events even at high energies. The analysis is illustrated at the example of the fission cross-section of 238U relative to that of 235U in the energy range from 40keV to 300MeV. [Copyright &y& Elsevier]
Published: 2010
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40. Neutron cross-sections for next generation reactors: New data from n_TOF.

Author: Colonna, N., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Becvar, F., Berthoumieux, E., Calviani, M., Calviño, F., Cano-Ott, D., Capote, R., Carrillo de Albornoz, A., Cennini, P., and Chepel, V.
Subjects: *NEUTRON sources, *TIME-of-flight mass spectrometry, *NUCLEAR reactors, *PHYSICS laboratories, *DATA analysis, *SPALLATION (Nuclear physics), *ACQUISITION of data
Abstract: Abstract: In 2002, an innovative neutron time-of-flight facility started operation at CERN: n_TOF. The main characteristics that make the new facility unique are the high instantaneous neutron flux, high resolution and wide energy range. Combined with state-of-the-art detectors and data acquisition system, these features have allowed to collect high accuracy neutron cross-section data on a variety of isotopes, many of which radioactive, of interest for Nuclear Astrophysics and for applications to advanced reactor technologies. A review of the most important results on capture and fission reactions obtained so far at n_TOF is presented, together with plans for new measurements related to nuclear industry. [Copyright &y& Elsevier]
Published: 2010
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41. The n_TOF Total Absorption Calorimeter for neutron capture measurements at CERN.

Author: Guerrero, C., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Bečvář, F., Berthoumieux, E., Calviño, F., Calviani, M., Cano-Ott, D., Capote, R., Carrapiço, C., Cennini, P., and Chepel, V.
Subjects: *NUCLEAR facilities, *CALORIMETERS, *NEUTRON capture, *NUCLEAR counters, *RADIOACTIVE substances, *NUCLEOSYNTHESIS
Abstract: Abstract: The n_TOF Collaboration has built and commissioned a high-performance detector for measurements called the Total Absorption Calorimeter (TAC). The TAC was especially designed for measuring neutron capture cross-sections of low-mass and/or radioactive samples with the accuracy required for nuclear technology and stellar nucleosynthesis. We present a detailed description of the TAC and discuss its overall performance in terms of energy and time resolution, background discrimination, detection efficiency and neutron sensitivity. [Copyright &y& Elsevier]
Published: 2009
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42. Status and outlook of the neutron time-of-flight facility n_TOF at CERN.

Author: Gunsing, F., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Bečvář, F., Berthoumieux, E., Calviño, F., Cano-Ott, D., Capote, R., de Albornoz, A. Carrillo, Cennini, P., Chepel, V., and Chiaveri, E.
Subjects: *ISOTOPES, *NUCLIDES, *QUANTUM theory, *NUCLEAR physics
Abstract: Abstract: The neutron time-of-flight facility n_TOF at CERN, fully operational since 2002, combines a high instantaneous neutron flux with high energy resolution. The wide energy range and the high neutron flux per time-of-flight burst result in a much enhanced signal to background ratio for neutron capture of radioactive isotopes and makes this facility well suited for the measurement of high quality neutron-induced reaction cross-sections. Neutrons are created by spallation reactions induced by a pulsed 20GeV/c proton beam impinging on a lead target. A 5cm water slab surrounding the lead target serves as a coolant and at the same time as a moderator of the spallation neutron spectrum, providing a wide energy spectrum from 0.1eV to about 250MeV. By the end of 2005, a first phase of data taking has been successfully terminated. Fission and capture experiments have been performed on a variety of isotopes of interest for nuclear astrophysics, advanced nuclear technologies and for basic nuclear physics. The instrumentation developed for this facility consists of parallel plate avalanche counter and fission ionization chamber detectors for the fission experiments and of low mass C6D6 detectors and a 4pi BaF2 total absorption calorimeter for capture experiments. A new data acquisition system, based on sampling of the detector signals, has been developed to cope with the high count rates and to minimize the effective dead time to only a few tens of nanosecond. A second phase of data taking is planned to start in 2007, after an upgrade of the spallation target. On the longer term, the construction of a flight path at 20m resulting in an increased neutron flux of about a factor of 100 opens new possibilities. [Copyright &y& Elsevier]
Published: 2007
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43. Pulse shape analysis of liquid scintillators for neutron studies

Subjects: *LIQUID scintillators, *GAMMA rays, *NEUTRONS
Abstract: The acquisition of signals from liquid scintillators with Flash ADC of high sampling rate (1 GS/s) has been investigated. The possibility to record the signal waveform is of great advantage in studies with γ''s and neutrons in a high count-rate environment, as it allows to easily identify and separate pile-up events. The shapes of pulses produced by γ-rays and neutrons have been studied for two different liquid scintillators, NE213 and C6D6. A 1-parameter fitting procedure is proposed, which allows to extract information on the particle type and energy. The performance of this method in terms of energy resolution and n/γ discrimination is analyzed, together with the capability to identify and resolve pile-up events. [Copyright &y& Elsevier]
Published: 2002
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44. Measurement of the 235 U(n,f) cross section at n_TOF from thermal to 170 keV

Author: Emilio Andrea Maugeri, Alexandru Negret, Rene Reifarth, M. Kokkoris, M. Krtička, F. Mingrone, C. Lederer, I. Knapova, B. Fernández-Domínguez, F. Käppeler, P. Vaz, J. M. Quesada, L. Tassan-Got, P. J. Woods, A. Kalamara, Alberto Ventura, T. Martinez, N. Patronis, A. K. Saxena, Arnaud Ferrari, Alberto Mengoni, J. Billowes, G. Tagliente, F. Gunsing, A. Pavlik, G. Vannini, A. Oprea, A. Kimura, Cristian Massimi, C. Domingo-Pardo, M. Bacak, A. Casanovas, M. Caamaño, Y. H. Chen, Simone Gilardoni, L. Audouin, L. Cosentino, A. Masi, Mario Barbagallo, A. S. Brown, T. Glodariu, F. Bečvář, D. G. Jenkins, R. Vlastou, Rugard Dressler, D. Radeck, R. Cardella, M. Mastromarco, E. Berthoumieux, D. Bosnar, D. Macina, G. Cortes, Carlos Guerrero, E. Mendoza, F. Calviño, H. Leeb, J. L. Tain, Nicola Colonna, J. Marganiec, S. Heinitz, J. Perkowski, E. Dupont, F. Cerutti, Kathrin Göbel, A. Stamatopoulos, Peter Schillebeeckx, A. Manna, C. Weiss, Jan Heyse, P. M. Milazzo, M. A. Cortés-Giraldo, E. Chiaveri, N. V. Sosnin, P. F. Mastinu, Anton Wallner, D. Cano-Ott, M. Diakaki, Niko Kivel, Pedro G. Ferreira, Annamaria Mazzone, Petar Žugec, Deniz Kurtulgil, Javier Praena, S. Lo Meo, A. Musumarra, P. V. Sedyshev, J. Balibrea, S. Warren, Ariel Tarifeño-Saldivia, S. J. Lonsdale, V. Variale, Ignacio Porras, S. Amaducci, C. Rubbia, E. Jericha, O. Aberle, Paolo Finocchiaro, Dorothea Schumann, J. A. Ryan, J. Lerendegui-Marco, V. Furman, T. J. Wright, I. F. Gonçalves, Hideo Harada, M. Sabaté-Gilarte, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, P. Kavrigin, Ralf Nolte, E. Griesmayer, L. A. Damone, E. González-Romero, A. R. García, I. Duran, J. Andrzejewski, V. Vlachoudis, S. Valenta, Marco Calviani, A. G. Smith, Y. Kadi, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Anna Erickson, Marianne Hamm, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: cross-section, Cross-section, Fission, n_TOF, 235U, fission, neutron time of flight, 01 natural sciences, 7. Clean energy, Nuclear physics, uranium, Cross section (physics), Neutron flux, 0103 physical sciences, Neutron cross section, fission, Neutron, n_TOF, 010306 general physics, Nuclear Experiment, Neutrons, Physics, [PHYS]Physics [physics], 010308 nuclear & particles physics, neutrons, Order (ring theory), Neutron radiation, Standard, Neutron capture, Uranium, Other
Abstract: The [Formula: see text]U(n,f) cross section plays a key role for nuclear physics due to its widespread use as a standard reference for neutron cross section measurements and for neutron flux measurements. Recent experimental data of the fission cross section have suggested the presence of discrepancies around 6–8% with respect to the most used libraries, precisely in the range between 10 keV and 30 keV. In order to shed light on this disagreement, an accurate measurement of the [Formula: see text]U(n,f) fission cross section has been performed at n_TOF facility @CERN, using the standard reactions 6Li(n,t) and [Formula: see text]B(n,[Formula: see text] as reference. A custom experimental setup based on a stack of silicon detectors sandwiched between pairs of [Formula: see text]U, 6Li and [Formula: see text]B targets, has been installed along the neutron beam line to intercept the same neutron flux, allowing the detection of the fission fragments and the products of the reference reactions at the same time. Such a technique allows calculation of the cross section via the “ratio method”, by normalizing the [Formula: see text]U(n,f) reaction yields with respect to the reference reactions and to the recommended data in the IAEA libraries; in particular, the integral between 7.8 and 11 eV has been chosen. Accurate Monte Carlo simulations have allowed evaluation of the neutron absorption in the different layers, as well as the detection efficiency of each detector. The data are in excellent agreement with the standard values and highlight the overestimation of the [Formula: see text]U(n,f) cross section between 9 and 18 keV in the most recent libraries.
Published: 2019
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45. On the use of stacks of fission-like targets for neutron capture experiments

Author: C. Mokry, Klaus Eberhardt, J. Lerendegui-Marco, J. M. Quesada, Bettina Lommel, Carlos Guerrero, Petra Thörle-Pospiech, Jörg Runke, Arnd R. Junghans, Christoph E. Düllmann, Ministerio de Economía y Competitividad (España), European Commission, and Universidad de Sevilla
Subjects: Physics, Neutron capture, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Fission, Nuclear engineering, Time-of-flight, Radioactive waste, 01 natural sciences, 7. Clean energy, Neutron temperature, Radioactive target, Time of flight, Stack (abstract data type), Electrodeposition, 0103 physical sciences, Neutron, n_TOF, 010306 general physics, Nuclear Experiment, Instrumentation
Abstract: The measurement of neutron induced reactions on unstable isotopes is of interest in many fields, from nuclear energy to astrophysics or applications; in particular transuranic isotopes are essential for the development of innovative nuclear reactors and for the management of the radioactive waste. In such measurements, the quality of the associated radioactive target is crucial for the success of the experiment, but in many cases the geometry, amount of mass and encapsulation of the target are not optimal, leading to limited results. In this work we propose to produce high quality radioactive targets for capture as a stack of thin targets using the techniques usually employed for fission measurements. In particular, we have succeeded in making a 242Pu target of nearly 100 mg by combining seven thin (1 mg/cm2) fission-like targets with 45 mm in diameter achieving a total backing thickness of only of aluminum. The target has been shown to perform successfully in experiments at both a neutron time-of-flight facility (n_TOF at CERN) and a thermal neutron beam (BRR at KFKI), providing the most accurate data from thermal up to 500 keV to date., This measurement has received funding from the EC FP7 Programme under the projects NEUTANDALUS (Grant No. 334315) and CHANDA (Grant No. 605203), the Spanish Ministry of Economy and Competitiveness projects FPA2014-53290-C2-2-P and FPA2016-77689-C2-1-R and the V Plan Propio de Investigación from the University of Seville .
Published: 2019

46. Sensitivity uncertainty analysis and new neutron capture cross-sections for gadolinium odd-isotopes to support nuclear safety

Author: F. Rocchi, Antonio Guglielmelli, Luiz Leal, Cristian Massimi, Patrizio Console Camprini, Rocchi F., Guglielmelli A., Camprini P.C., Massimi C., Leal L., Rocchi, F., Guglielmelli, A., Console Camprini, P., Massimi, C., and Leal, L.
Subjects: Physics, Nuclear reaction, 020209 energy, Nuclear engineering, Experimental data, 02 engineering and technology, Neutron capture cross section, 01 natural sciences, Gadolinium odd isotopes, Neutron capture cross sections, n_TOF, Sensitivity and uncertainty analysis, 010305 fluids & plasmas, Neutron capture, Cross section (physics), Nuclear Energy and Engineering, Criticality, Gadolinium odd isotope, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Research reactor, Sensitivity (control systems), Uncertainty analysis
Abstract: This paper presents the results of a sensitivity and uncertainty (S&U) analysis on k eff performed on a BWR fuel assembly (FA) poisoned with gadolinia, as well as of a criticality and sensitivity study of the ZED-2 research reactor, in whose moderator has been dissolved. The evidence collected from the ZED-2 analysis, the BWR FA S&U analysis, and from other criticality benchmarks indicates that improvements should be introduced in the 157 Gd (n, γ) cross section evaluation, especially in the thermal and near-thermal ranges, and in its uncertainty. In 2016, to cope with this need, the n_TOF Collaboration conducted an experimental campaign to obtain new 157 Gd and 155 Gd cross section measurements. The preliminary information available from the analysis of the experimental data suggests that these new data have the potential to correct some of the discrepancies found between some experimental benchmarks and their simulation.
Published: 2019

47. Measurement of 73Ge(n,g) cross sections and implications for stellar nucleosynthesis

Author: S. Montesano, V. Khryachkov, A. Tsinganis, Alfredo Ferrari, F. R. Palomo-Pinto, Nicola Colonna, E. Dupont, A. Goverdovski, G. Tagliente, J. Heyse, A. Musumarra, Claudia Lederer-Woods, M. Mastromarco, F. Gunsing, Cristian Massimi, Pedro G. Ferreira, Mario Weigand, I. Duran, E. Mendoza, Anton Wallner, M. Bacak, P. V. Sedyshev, M. Mirea, J. Balibrea, V. Furman, F. Calviño, H. Leeb, Ioana Gheorghe, J. Perkowski, Tanja Heftrich, S. Heinitz, J. Billowes, M. Sabaté-Gilarte, A. Kimura, Francesca Matteucci, A. Riego-Perez, T. Glodariu, M. Krtička, A. Hernández-Prieto, S. Warren, V. Bécares, L. Cosentino, N. Patronis, R. Dressler, Roberto Losito, M. S. Robles, T. Martinez, E. Jericha, C. Weiss, D. Macina, R. Vlastou, V. Variale, Paolo Finocchiaro, A. Stamatopoulos, P. M. Milazzo, O. Aberle, J. A. Ryan, D. G. Jenkins, E. Berthoumieux, Mario Barbagallo, M. Diakaki, Alberto Mengoni, J. Marganiec, Carlos Guerrero, F. Bečvář, A. Saxena, S. V. Suryanarayana, D. Schumann, Damir Bosnar, Y. Kadi, E. González-Romero, P. F. Mastinu, A. Tattersall, P. Schillebeeckx, Hideo Harada, M. A. Cortés-Giraldo, P. Kavrigin, F. Mingrone, S. Valenta, J. Andrzejewski, Ralf Nolte, Marco Calviani, V. Vlachoudis, M. Kokkoris, Rene Reifarth, E. Griesmayer, A. G. Smith, Petar Žugec, C. Paradela, M. Dietz, Stefan Schmidt, L. A. Damone, L. Audouin, J. M. Quesada, L. Tassan-Got, K. Göbel, B. Fernández-Domínguez, F. Käppeler, T. Wright, Tatsuya Katabuchi, S. Barros, U. Battino, A. Pavlik, C. Domingo-Pardo, E. Chiaveri, D. Cano-Ott, J. I. Porras, I. Knapova, P. Vaz, Alberto Ventura, C. Rubbia, J. L. Tain, Niko Kivel, G. Cortes, J. Lerendegui-Marco, A. R. García, M. Brugger, I. F. Gonçalves, R. J. W. Frost, C. Beinrucker, E. Leal-Cidoncha, Javier Praena, S. Lo Meo, Fabio Belloni, G. Vannini, A. Gawlik, Thomas Rauscher, Ariel Tarifeño-Saldivia, M. Licata, K. Deo, M. Caamaño, V. Ketlerov, F. Cerutti, Lederer-Woods, C., Battino, U., Ferreira, P., Gawlik, A., Guerrero, C., Gunsing, F., Heinitz, S., Lerendegui-Marco, J., Mengoni, A., Reifarth, R., Tattersall, A., Valenta, S., Weiss, C., Aberle, O., Andrzejewski, J., Audouin, L., Becares, V., Bacak, M., Balibrea, J., Barbagallo, M., Barros, S., Becvar, F., Beinrucker, C., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cerutti, F., Chiaveri, E., Colonna, N., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Deo, K., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dressler, R., Dupont, E., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Finocchiaro, P., Frost, R. J. W., Furman, V., Gobel, K., Garcia, A. R., Gheorghe, I., Glodariu, T., Goncalves, I. F., Gonzalez-Romero, E., Goverdovski, A., Griesmayer, E., Harada, H., Heftrich, T., Hernandez-Prieto, A., Heyse, J., Jenkins, D. G., Jericha, E., Kappeler, F., Kadi, Y., Katabuchi, T., Kavrigin, P., Ketlerov, V., Khryachkov, V., Kimura, A., Kivel, N., Knapova, I., Kokkoris, M., Krticka, M., Leal-Cidoncha, E., Leeb, H., Licata, M., Lo Meo, S., Losito, R., Macina, D., Marganiec, J., Martinez, T., Massimi, C., Mastinu, P., Mastromarco, M., Matteucci, F., Mendoza, E., Milazzo, P. M., Mingrone, F., Mirea, M., Montesano, S., Musumarra, A., Nolte, R., Palomo-Pinto, F. R., Paradela, C., Patronis, N., Pavlik, A., Perkowski, J., Porras, J. I., Praena, J., Quesada, J. M., Rauscher, T., Riego-Perez, A., Robles, M., Rubbia, C., Ryan, J. A., Sabate-Gilarte, M., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Sedyshev, P., Smith, A. G., Stamatopoulos, A., Suryanarayana, S. V., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Tsinganis, A., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlachoudis, V., Vlastou, R., Wallner, A., Warren, S., Weigand, M., Wright, T., Zugec, P., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), n_TOF, Ministerio de Economía y Competitividad (España), Bécares, V., Bečvář, F., Caamaño, M., Calviño, F., Cortés, G., Cortés-Giraldo, M.A., Damone, L.A., Durán, I., Fernández-Domínguez, B., Frost, R.J.W., Göbel, K., García, A.R., Gonçalves, I.F., González-Romero, E., Hernández-Prieto, A., Jenkins, D.G., Käppeler, F., Krtička, M., Martínez, T., Milazzo, P.M., Palomo-Pinto, F.R., Porras, J.I., Quesada, J.M., Ryan, J.A., Sabaté-Gilarte, M., Smith, A.G., Suryanarayana, S.V., Tain, J.L., Tarifeño-Saldivia, A., Žugec, P., Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Nucleosynthesis, Neutron capture, s process, Germanium, n_TOF, s proce, Nuclear reaction, Natural abundance, nucl-ex, 01 natural sciences, 7. Clean energy, Stellar nucleosynthesis, CERN, Astrophysics::Solar and Stellar Astrophysics, n_TOF, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, Cross section, Germanium, lcsh:QC1-999, PRIRODNE ZNANOSTI. Fizika, Neutron capture, Nucleosynthesis, s process, Nucleosíntesi, Nuclear and High Energy Physics, nTOF, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Neutron, Neutrons--Captura, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Neutrons--Capture, Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, 010306 general physics, Nucleosynthesi, Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Capture cross section, NATURAL SCIENCES. Physics, Stars, 13. Climate action, s-process, lcsh:Physics
Abstract: 73Ge(n, γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300keV, providing for the first time experimental data above 8keV. Results indicate that the stellar cross section at kT=30keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73Ge produced in stars, which would explain the low isotopic abundance of 73Ge in the solar system., This work was supported by the Austrian Science Fund FWF (J3503), the Adolf Messer Foundation (Germany), the UK Science and Facilities Council (ST/M006085/1), and the European Research Council ERC-2015-StG Nr.677497.
Published: 2019
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48. Measurement of the 244Cm and 246Cm neutron-induced capture cross sections at the n_TOF facility

Author: A. Oprea, J. Heyse, F. Gunsing, E. Chiaveri, G. Vannini, D. Cano-Ott, Paolo Finocchiaro, M. Bacak, F. Ogállar, V. Bécares, A. Kimura, Y. H. Chen, A. Musumarra, Cristian Massimi, G. Tagliente, J. Ulrich, L. Audouin, V. Michalopoulou, J. Lerendegui-Marco, I. Duran, A. Masi, Francesca Matteucci, A. Gawlik, Mario Barbagallo, G. Cortes, T. Glodariu, Thomas Rauscher, D. G. Jenkins, I. Knapova, D. Schumann, Alfredo Ferrari, D. Radeck, F. Becčvář, I. F. Gonçalves, P. Vaz, F. Mingrone, J. Andrzejewski, R. Dressler, Ralf Nolte, E. Mendoza, Simone Gilardoni, Carlos Guerrero, A. Casanovas, E. Berthoumieux, Alberto Ventura, V. Vlachoudis, L. A. Damone, E. González-Romero, F. Calviño, S. Heinitz, A. S. Brown, A. Tsinganis, M. Diakaki, O. Aberle, L. Cosentino, Nicola Colonna, M. Krtička, J. Perkowski, E. Dupont, G. Bellia, A. Pavlik, P. Schillebeeckx, Maurizio Busso, C. Domingo-Pardo, Diego Vescovi, T. Martinez, V. Variale, A. Saxena, A. Stamatopoulos, Dimitri Rochman, V. Alcayne, Z. Eleme, Hideo Harada, Ariel Tarifeño-Saldivia, S. J. Lonsdale, D. Macina, Javier Praena, S. Lo Meo, L. Persanti, Y. Kopatch, Ignacio Porras, A. Manna, Rene Reifarth, S. Urlass, P. M. Milazzo, M. Mastromarco, P. F. Mastinu, L. Caballero-Ontanaya, Alexandru Negret, Claudia Lederer-Woods, J. L. Tain, T. Talip, J. M. Quesada, N. Patronis, L. Tassan-Got, B. Fernández-Domínguez, Anton Wallner, F. Käppeler, M. Caamaño, Sergio Cristallo, Deniz Kurtulgil, Niko Kivel, F. Cerutti, V. Furman, M. Sabaté-Gilarte, Alberto Mengoni, I. Ladarescu, N. V. Sosnin, Tatsuya Katabuchi, Annamaria Mazzone, Petar Žugec, J. Billowes, D. Ramos-Doval, Emilio Andrea Maugeri, M. Kokkoris, M. A. Cortés-Giraldo, R. Vlastou, Damir Bosnar, Y. Kadi, S. Simone, K. Göbel, T. Wright, S. Valenta, Marco Calviani, A. G. Smith, M. Dietz, Philip Woods, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Alcayne, V., Kimura, A., Mendoza, E., Cano-Ott, D., Martínez, T., Aberle, O., Andrzejewski, J., Audouin, L., Bécares, V., Bacak, M., Barbagallo, M., Becčvář, F., Bellia, G., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caamaño, M., Caballero-Ontanaya, L., Calviño, F., Calviani, M., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Colonna, N., Cortés, G., Cortés-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Diakaki, M., Dietz, M., Domingo-Pardo, C., Dressler, R., Dupont, E., Durán, I., Eleme, Z., Fernández-Domínguez, B., Ferrari, A., Finocchiaro, P., Furman, V., Göbel, K., Gawlik, A., Gilardoni, S., Glodariu, T., Gonçalves, I. F., González-Romero, E., Guerrero, C., Gunsing, F., Harada, H., Heinitz, S., Heyse, J., Jenkins, D. G., Käppeler, F., Kadi, Y., Katabuchi, T., Kivel, N., Knapova, I., Kokkoris, M., Kopatch, Y., Krtička, M., Kurtulgil, D., Ladarescu, I., Lederer-Woods, C., Lerendegui-Marco, J., Meo, S. Lo, Lonsdale, S. J., Macina, D., Manna, A., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Matteucci, F., Maugeri, E. A., Mazzone, A., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Ogállar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Persanti, L., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Simone, S., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Tagliente, G., Tain, J. L., Talip, T., Tarifeño-Saldivia, A., Tassan-Got, L., Tsinganis, A., Ulrich, J., Urlass, S., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T., and Žugec, P.
Subjects: Nuclear reaction, Neutron emission, QC1-999, Nuclear physics, 01 natural sciences, 7. Clean energy, law.invention, law, 0103 physical sciences, CERN, Neutron, n_TOF, 010306 general physics, [PHYS]Physics [physics], Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Isotope, Física [Àrees temàtiques de la UPC], Cross section, 010308 nuclear & particles physics, r-process, Actinide, Nuclear reactor, Neutron capture, n_TOF, 244Cm, 246Cm, neutron capture, 13. Climate action, neutron capture, n_TOF, r-process, Física nuclear, Other, n_TOF, neutron reaction, Cm, neutron capture
Abstract: The neutron capture reactions of the 244Cm and 246Cm isotopes open the path for the formation of heavier Cm isotopes and heavier elements such asThe neutron capture reactions of the 244Cm and 246Cm isotopes open the path for the formation of heavier Cm isotopes and heavier elements such as Bk and Cf in a nuclear reactor. In addition, both isotopes belong to the minor actinides with a large contribution to the decay heat and to the neutron emission in irradiated fuels. There are only two previous 244Cm and 246Cm capture cross section measurements: one in 1969 using a nuclear explosion and the most recent data measured at J-PARC in 2010. The data for both isotopes are very scarce due to the difficulties in performing the measurements: high intrinsic activity of the samples and limited facilities capable of providing isotopically enriched samples. We have measured both neutron capture cross sections at the n_TOF Experimental Area 2 (EAR-2) with three C6D6 detectors and also at Area 1 (EAR-1) with the TAC. Preliminary results assessing the quality and limitations (background subtraction, measurement technique and counting statistics) of this new experimental datasets are presented and discussed. Bk and Cf in a nuclear reactor. In addition, both isotopes belong to the minor actinides with a large contribution to the decay heat and to the neutron emission in irradiated fuels. There are only two previous 244Cm and 246Cm capture cross section measurements: one in 1969 using a nuclear explosion and the most recent data measured at J-PARC in 2010. The data for both isotopes are very scarce due to the difficulties in performing the measurements: high intrinsic activity of the samples and limited facilities capable of providing isotopically enriched samples. We have measured both neutron capture cross sections at the n_TOF Experimental Area 2 (EAR-2) with three C6D6 detectors and also at Area 1 (EAR-1) with the TAC. Preliminary results assessing the quality and limitations (background subtraction, measurement technique and counting statistics) of this new experimental datasets are presented and discussed.
Published: 2019
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49. Measurement of the 235U(n,f) cross section relative to the 6Li(n,t) and 10B(n,a) standards from thermal to 170 keV neutron energy range at n_TOF

Author: Amaducci, Simone, Cosentino, Luigi, Barbagallo, Massimo, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Tarifeño Saldivia, Ariel Esteban, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Cross section, Física [Àrees temàtiques de la UPC], Astrophysics::High Energy Astrophysical Phenomena, CERN, Nuclear physics, n_TOF, Física nuclear, Nuclear reactions
Abstract: The 235U(n,f) cross section was measured in a wide energy range at n_TOF relative to 6Li(n,t) and 10B(n,alpha), with high resolution and in a wide energy range, with a setup based on a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the reaction yields under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10÷30 keV neutron energy range had been previously observed in other experiments, indicating a cross section systematically lower by several percent relative to major evaluations. The present results indicate that the evaluated cross section in the 9÷18 keV neutron energy range is indeed overestimated, both in the recent updates of ENDF/B-VIII.0 and of the IAEA reference data. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The new, high accuracy results here reported may lead to a reduction of the uncertainty in the 1÷100 keV neutron energy region. Finally, the present data provide additional confidence on the recently re-evaluated cross section integral between 7.8 and 11 eV.
Published: 2019

50. Fission program at n_TOF

Author: A. Musumarra, E. Dupont, J. Lerendegui-Marco, S. Amaducci, M. A. Cortés-Giraldo, I. Ferro-Gonçalves, J. Moreno-Soto, B. Fernández-Domíngez, A. Oprea, A. Kimura, T. Martinez, A. Mengoni, Z. Eleme, M. Bacak, J. Andrzejewski, Emilio Andrea Maugeri, D. Cano-Ott, A. Sekhar, M. Diakaki, A. Pavlik, M. Kokkoris, Alexandru Negret, Diego Vescovi, Kathrin Göbel, C. Domingo-Pardo, I. Duran, C. Rubbia, F. Käppeler, L. Caballero, M. Sabaté-Gilarte, Simone Gilardoni, V. Variale, Dimitri Rochman, Arnd R. Junghans, Rugard Dressler, Jan Heyse, G. Cortes, Maurizio Busso, A. Masi, A. Gawlik, Y. Kopatch, V. Babiano-Suarez, Q. Ducasse, Ariel Tarifeño-Saldivia, S. J. Lonsdale, D. G. Jenkins, L. Cosentino, A. Tsinganis, Luciano Piersanti, Nicola Colonna, Ignacio Porras, Vasilis Vlachoudis, J. L. Tain, E. Chiaveri, U. Jiri, P. F. Mastinu, V. Furman, T. J. Wright, B. Thomas, D. Bosnar, Y. Kadi, Rene Reifarth, G. Vannini, V. Alcayne, E. González-Romero, L. A. Damone, O. Aberle, D. Macina, M. Caamaño, Carlos Guerrero, N. V. Sosnin, A. Manna, M. A. Millán-Callado, Javier Praena, R. Garg, M. Krticˇka, Annamaria Mazzone, Petar Žugec, S. Valenta, F. Ogállar, P. J. Davies, F. Mingrone, S. Bennett, G. Tagliente, P. Sprung, Marco Calviani, D. Ramos Doval, A. Stamatopoulos, J. M. Quesada, F. Gunsing, L. Tassan-Got, P. Torres-Sánchez, A. G. Smith, S. Urlass, M. Mastromarco, M. Dietz, A. Casanovas, Cristian Massimi, F. Cerutti, Sergio Cristallo, Massimo Barbagallo, Claudia Lederer-Woods, Anton Wallner, E. Pirovano, Deniz Kurtulgil, I. Knapova, S. Heinitz, P. Vaz, C. Petrone, R. Vlastou, E. Berthoumieux, F. Calviño, J. Perkowski, Alberto Ventura, P. J. Woods, N. Patronis, A. K. Saxena, Arnaud Ferrari, I. Ladarescu, L. Audouin, V. Michalopoulou, E. Mendoza, Peter Schillebeeckx, A. S. Brown, P. M. Milazzo, Paolo Finocchiaro, Dorothea Schumann, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris-Sud - Paris 11 (UP11), Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Fission, QC1-999, Nuclear Theory, Nuclear physics, 01 natural sciences, Plutonium-240, 0103 physical sciences, Plutonium-242, CERN, Neutron, n_TOF, Neutron captures, n_TOF, Fission, r-process, 010306 general physics, Nuclear Experiment, Physics, [PHYS]Physics [physics], Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Física [Àrees temàtiques de la UPC], Cross section, Neutron captures, 010308 nuclear & particles physics, r-process, Neutron radiation, Neutron capture, n_TOF, fission program, cross section measurements, Física nuclear, Other
Abstract: Since its start in 2001 the n_TOF collaboration developed a measurement program on fission, in view of advanced fuels in new generation reactors. A special effort was made on measurement of cross sections of actinides, exploiting the peculiarity of the n_TOF neutron beam which spans a huge energy domain, from the thermal region up to GeV. Moreover fission fragment angular distributions have also been measured. An overview of the cross section results achieved with different detectors is presented, including a discussion of the 237Np case where discrepancies showed up between different detector systems. The results on the anisotropy of the fission fragments and its implication on the mechanism of neutron absorption, and in applications, are also shown.
Published: 2019
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