Search

Your search keyword '"Marco, J."' showing total 270 results
Start Over Author "Marco, J." Publisher edp sciences
270 results on '"Marco, J."'

1. The n_TOF facility at CERN

Author

Tagliente G., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea Correa J., Bernardes A.P., Berthoumieux E., Beyer R., Boromiza M., Bosnar D., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Casanovas A., Castelluccio D.M., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Claps G., Colombetti P., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M.A., Cosentino L., Cristallo S., Dellmann S., Diacono D., Di Castro M., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Eleme Z., Eslami M., Fargier S., Fernández-Domínguez B., Finocchiaro P., Furman V., Gandhi A., García-Infantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., González-Romero E., Goula S., Griesmayer E., Guerrero C., Gunsing F., Gustavino C., Heyse J., Hillman W., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Kaperoni K., Kokkoris M., Koll D., Kopatch Y., Krtička M., Kyritsis N., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lerner G., Manna A., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E.A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P.M., Mucciola R., Musacchio-Gonzalez E., Musumarra A., Negret A., Pérez de Rada A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J.A., Pellegriti M.G., Perkowski J., Petrone C., Piersanti L., Pirovano E., Plaza del Olmo J., Pomp S., Porras I., Praena J., Quesada J. M., Reifarth R., Rochman D., Romanets Y., Rooney A., Rubbia C., Sánchez-Caballero A., Sabaté-Gilarte M., Scarpa D., Schillebeeckx P., Schumann D., Smith A.G., Sosnin N.V., Spelta M., Stamati M.E., Tamburrino A., Tarifeño-Saldivia A., Tarrío D., Torres-Sánchez P., Tosi S., Tsiledakis G., Valenta S., Vaz P., Vecchio G., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Weiss C., Woods P.J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The neutron Time-of-Flight (TOF) research facility at CERN, n_TOF, has been a pioneering platform for neutron cross-section measurements since its inception in 2001. It boasts three distinct experimental areas, each tailored to address a specific range of neutron energies. This paper delves into the intricacies of the n_TOF facility, including its recent upgrade during the Long Shutdown 2 (LS2) at CERN. Additionally, it highlights the key characteristics of the detectors employed for capture and fission cross-section measurements, paving the way for future research endeavors.

Published
2024
Full Text
View/download PDF

2. Description and outlook of the 50,53Cr(n,γ) cross section measurement at n_TOF and HiSPANoS

Author

Pérez-Maroto P., Guerrero C., Casanovas A., Fernández B., Aberle O., Alcayne V., Altieri S., Amaducci S., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea Correa J., Beltrami C., Bennett S., Bernardes A. P., Berthoumieux E., Beyer R., Boromiza M., Bosnar D., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Castelluccio D. M., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Colombetti P., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Dellmann S., Di Castro M., Di Maria S., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., García-Infantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., González-Romero E., Gunsing F., Gustavino C., Heyse J., Hillman W., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Kaperoni K., Kaur G., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kyritsis N., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lerner G., Manna A., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas F., Musacchio-Gonzalez E., Musumarra A., Negret A., Pérez de Rada A., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Pirovano E., Plaza del Olmo J., Pomp S., Porras I., Praena J., Quesada J. M., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sánchez-Caballero A., Sabaté-Gilarte M., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Stamati M. E., Sturniolo A., Tagliente G., Tarifeño-Saldivia A., Tarrío D., Torres-Sánchez P., Vagena E., Valenta S., Variale V., Vaz P., Vecchio G., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., Zarrella R., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Chromium is a very relevant element regarding criticality safety in nuclear reactors because of its presence in stainless steel, an important structural material. Currently, there are serious discrepancies between the different evaluations regarding the neutron capture cross sections of 50Cr and 53Cr, most probably related to the difficulty of reducing and then estimating the very large neutron scattering effects on the shape of the resonances. In this context, there is a recent entry in the Nuclear Energy Agency (NEA) High Priority Request List (HPRL) to measure these reactions between 1 and 100 keV with an accuracy of 8-10%. In response to this request, we have performed a time-of-flight experiment at CERN n_TOF (Switzerland) and a complementary activation experimenton 50Crat30and90keVatCNAHiSPANoS(Spain).Theexperiments are presented herein, together with a discussion on the quality of the preliminary data and the results to be expected.

Published
2024
Full Text
View/download PDF

3. Commissioning of miniBELEN-10A, a moderated neutron counter with a flat efficiency for thick-target neutron yields measurements

Author

Mont-Geli N., Tarifeño-Saldivia A., Fraile L.M., Viñals S., Perea A., Pallàs M., Cortés G., Garcia G., Nácher E., Tain J.L., Alcayne V., Alonso-Sañudo O., Algora A., Balibrea-Correa J., Benito J., Borge M.J.G., Briz J.A., Calviño F., Cano-Ott D., De Blas A., Domingo-Pardo C., Fernández B., Garcia R., Gómez-Camacho J., González-Romero E.M., Guerrero C., Lerendegui-Marco J., Llanos M., Martínez T., Martínez-Nouvilas V., Mendoza E., Murias J.R., Orrigo S.E.A., Pérez de Rada A., Pesudo V., Plaza J., Quesada J.M., Sánchez A., Sánchez-Tembleque V., Santorelli R., Tengblad O., Udías J.M., and Villamarín D.

Subjects
Physics, QC1-999
Abstract

miniBELEN-10A is a modular and transportable moderated neutron counter with a nearly flat detection efficiency up to 8 MeV. The detector was designed to carry out measurements of (α, n) reactions in the context of the Measurement of Alpha Neutron Yields (MANY) project. In this work we present the results of the commissioning of miniBELEN-10A using the relatively well-known thick-target neutron yields from 27Al(α, n)30P.

Published
2023
Full Text
View/download PDF

4. Radiotracers for the study of Marine and Oceanic Ecosystems

Author

Nácher E., Rubio B., Balibrea J., Ladarescu I., Lerendegui-Marco J., Martínez M., Sánchez L., García- Párraga D., Crespo-Picazo J. L., Roche M., Tomás C., and de Angelis G.

Subjects
Physics, QC1-999
Abstract

Acidification of the oceans influences the physiology of aquatic organisms and, in general, the ecology of marine ecosystems. Here we report on the first stage of the REMO project, focused on the study of marine species especially affected by acidification of waters, using radiotracers and nuclear instrumentation techniques.

Published
2023
Full Text
View/download PDF

5. β-delayed neutron spectroscopy of 85,86As with MONSTER

Author

Pérez de Rada A., Cano-Ott D., Martínez T., Alcayne V., Mendoza E., Plaza J., Sanchez-Caballero A., Villamarín D., Äystö J., Jokinen A., Kankainen A., Penttilä H., Rinta-Antila S., Agramunt J., Algora A., Domingo-Pardo C., Lerendegui-Marco J., Taín J.L., Banerjee K., Bhattacharya C., Roy P., Calviño F., Cortés G., Delafosse C., Matea I., Benito J., Alhomaidhi S., and Mistry A.K.

Subjects
Physics, QC1-999
Abstract

The β-delayed neutron emission in the 85,86As β-decays has been measured at the IGISOL facility of the Accelerator Laboratory of the University of Jyväskylä (JYFL-ACCLAB). The complete β-decays have been studied with a complex setup that consists of a plastic scintillator, the MOdular Neutron time-of-flight SpectromeTER (MONSTER), and two types of γ-ray detectors—an HPGe clover and four LaBr3 crystals. The β-delayed neutron energy distributions have been determined by unfolding the TOF spectra with an innovative methodology based on the iterative Bayesian unfolding method and accurate Monte Carlo simulations.

Published
2023
Full Text
View/download PDF

6. Measurement of the 241Am(n,γ) cross section at the n_TOF facility at CERN

Author

Oprea A., Gunsing F., Schillebeeckx P., Aberle O., Bacak M., Berthoumieux E., Cano-Ott D., Diakaki M., Dupont E., Geslot B., Glodariu† T., Heyse J., Mendoza E., Negret A., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Bécares V., Babiano-Suarez V., Barbagallo M., Bečvář F., Bellia G., 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., Dietz M., Domingo-Pardo C., Dressler R., Durán I., Eleme Z., Fernández-Domínguez B., Ferrari A., Finocchiaro P., Furman V., Göbel K., Garg R., Gawlik-Ramięga A., Gilardoni S., Gonçalves I. F., González-Romero E., Guerrero C., Harada H., Heinitz S., Jenkins D. G., Jericha E., Käppeler† F., Kaur G., Kadi Y., Kimura A., Kivel N., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Leeb H., Lerendegui-Marco J., Lo Meo S., Lonsdale S. J., Macina D., Manna A., Martínez T., 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., Nolte R., Ogállar F., Patronis N., Pavlik A., Perkowski J., Piersanti L., Porras I., Praena J., Quesada J. M., Radeck D., Ramos-Doval D., Rauscher T., Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schumann D., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Talip T., Tarifeño-Saldivia A., Tassan-Got L., Torres-Sánchez P., Tsinganis A., Ulrich J., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The neutron capture cross section of 241Am is an important quantity for nuclear energy production and fuel cycle scenarios. Several measurements have been performed in recent years with the aim to reduce existing uncertainties in evaluated data. Two previous measurements, performed at the 185 m flight-path station EAR1 of the neutron time-of-flight facility n_TOF at CERN, have permitted to substantially extend the resolved resonance region, but suffered in the near-thermal energy range from the unfavorable signal-to-background ratio resulting from the combination of the high radioactivity of 241Am and the rather low thermal neutron flux. The here presented 241Am(n,γ) measurement, performed with C6D6 liquid scintillator gamma detectors at the 20 m flight-path station EAR2 of the n_TOF facility, took advantage of the much higher neutron flux. The current status of the analysis of the data, focussed on the low-energy region, will be described here.

Published
2023
Full Text
View/download PDF

7. Results of the 244Cm, 246Cm and 248Cm neutron-induced capture cross sections measurements at EAR1 and EAR2 of the n_TOF facility

Author

Alcayne V., Mendoza E., Cano-Ott D., Kimura A., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V., Bacak M., Barbagallo M., Bécares V., Bečvář F., Bellia G., Berthoumieux E., Billowes J., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G. P., 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-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Glodariu T., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Kadi Y., Käppeler F., Kivel N., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lo Meo S., Lonsdale S.-J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P. F., Mastromarco M., Matteucci F., Maugeri E., 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., Piersanti L., Porras I., Praena J., Quesada J. M., Radeck D., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Smith A. G., Sosnin N., Stamatopoulos A., Tagliente G., Tain J. L., Talip Z., Tarifeño-Saldivia A. E., Tassan-Got L., Torres-Sánchez P., Tsinganis A., Ulrich J., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Accurate neutron capture cross section data for minor actinides (MAs) are required to estimate the production and transmutation rates of MAs in light water reactors, critical fast reactors like Gen-IV systems, and other innovative reactor systems such as accelerator driven systems (ADS). In particular, 244Cm, 246Cm and 248Cm play a role in the transport, storage and transmutation of the nuclear waste of the current nuclear reactors, due to the contribution of these isotopes to the radiotoxicity, neutron emission, and decay heat in the spent nuclear fuel. Also, capture reactions in these Cm isotopes open the path for the formation of heavier elements. In this work, the results of the capture cross section measurement on 244Cm, 246Cm and 248Cm performed at the CERN n_TOF facility are presented. It is important to notice that the Cm samples used in the experiment at n_TOF have been used previously in an experiment at J-PARC, this experiment and the previous one done in the 70s with a nuclear explosion were the only previous capture experiments for these isotopes. At n_TOF, the capture cross section measurements of 244Cm, 246Cm and 248Cm were performed at the 20 m vertical flight path (EAR2) with three C6D6 total energy detectors. In addition, the cross section of 244Cm was measured at the 185 m flight path (EAR1) with a Total Absorption Calorimeter (TAC). The combination of measurements in EAR1 and EAR2 has contributed to controlling and reducing the systematic uncertainties in the results. The compatibility of the different measurements performed and the techniques to obtain the results are presented in this paper as well as the procedure to obtain the resonance parameters.

Published
2023
Full Text
View/download PDF

8. The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF

Author

Dietz M., Lederer-Woods C., Tattersall A., Battino U., Gunsing F., Heinitz S., Lerendegui-Marco J., Krtička M., Reifarth R., Valenta S., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Bacak M., Balibrea J., Barbagallo M., Bečvář F., Berthoumieux E., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Diakaki M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Göbel K., García A. R., Gawlik-Ramie˛ga A., Gilardoni S., Glodariu† T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Harada H., Heyse J., Jenkins D. G., Jericha E., Käppeler† F., Kadi Y., Kahl D., Kalamara A., Kavrigin P., Kimura A., Kivel N., Kokkoris M., Kurtulgil D., Leal-Cidoncha E., Leeb H., Lo Meo S., Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez 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., Rubbia C., Ryan J. A., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A., Tassan-Got L., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Warren S., Weiss C., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The 72Ge(n, γ) Maxwellian-Averaged Cross Section (MACS) has an important influence on the production of isotopes between Ge and Zr in the weak s-process in massive stars and so far only theoretical estimations are available. An experiment was carried out at the neutron time-of-flight facility n_TOF at CERN to measure the 72Ge(n, γ) reaction for the first time at stellar neutron energies. The capture measurement was performed using an enriched 72GeO2 sample at a flight path length of 184 m, which provided high neutron energy resolution. The prompt gamma rays produced after neutron capture were detected with a set of liquid scintillation detectors (C6D6). The neutron capture yield is derived from the counting spectra taking into account the neutron flux and the gamma-ray detection efficiency using the Pulse Height Weighting Technique. Over 70 new neutron resonances were identified, providing an improved resolved reaction cross section to calculate experimental MACS values for the first time. The experiment, data analysis and the new MACS results will be presented including their impact on stellar nucleosynthesis, which was investigated using the post-processing nucleosynthesis code mppnp for a 25 solar mass model.

Published
2023
Full Text
View/download PDF

9. New perspectives for neutron capture measurements in the upgraded CERN-n_TOF Facility

Author

Lerendegui-Marco J., Casanovas A., Alcayne V., Aberle O., Altieri S., Amaducci S., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea J., Beltrami C., Bennett S., Bernardes A. P., Berthoumieux E., Boromiza M., Bosnar D., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Colombetti P., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Dellmann S., Di Castro M., Di Maria S., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández B., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., García-Infantes F., Gawlik-Ramiega A., Gervino G., Gilardoni S., González-Romero E., Guerrero C., Gunsing F., Gustavino C., Heyse J., Hillman W., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Kaperoni K., Kaur G., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kyritsis N., Ladarescu I., Lederer-Woods C., Lerner G., Manna A., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas† F., Musacchio-Gonzalez E., Musumarra A., Negret A., Pérez de Rada A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Pirovano E., Plaza J., Pomp S., Porras I., Praena J., Quesada J. M., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sánchez A., Sabaté-Gilarte M., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Stamati M. E., Sturniolo A., Tagliente G., Tarrío D., Torres-Sánchez P., Urlass S., Vagena E., Valenta S., Variale V., Vaz P., Vecchio G., Vescovi D., Vlachoudis V., Vlastou R., Wallner T., Woods P. J., Wright T., Zarrella R., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The n_TOF facility has just undergone in 2021 a major upgrade with the installation of its third generation spallation target that has been designed to optimize the performance of the two n_TOF time-of-flight lines. This contribution describes the key features and limitations for capture measurements in the two beam lines prior to the target upgrade and presents first results of (n,γ) measurements carried out as part of the commissioning of the upgraded facility. In particular, the energy resolution, a key factor for both increasing the signal-to-background ratio and obtaining accurate resonance parameters, has been clearly improved for the 20 m long vertical beam-line with the new target design while keeping the remarkably high resolution of the long beamline n_TOF-EAR1. The improvements in the n_TOF neutron beam-lines need to be accompanied by improvements in the instrumentation. A review is given on recent detector R&D projects aimed at tackling the existing challenges and further improving the capabilities of this facility.

Published
2023
Full Text
View/download PDF

10. Compton imaging for enhanced sensitivity (n,γ) cross section TOF experiments: Status and prospects

Author

Domingo-Pardo C., Babiano-Suarez V., Balibrea-Correa J., Caballero L., Ladarescu I., Lerendegui-Marco J., Tarifeño-Saldivia A., Aberle O., Alcayne V., Altieri S., Amaducci S., Andrzejewski J., Bacak M., Beltrami C., Bennett S., Bernardes A. P., Berthoumieux E., Beyer R., Boromiza M., Bosnar D., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Casanovas A., Cerutti F., Cescutti G., Chiaveri E., Colombetti P., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Dellmann S., Di Castro M., Di Maria S., Diakaki M., Dietz M., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández B., Fernández-Domínguez B., Finocchiaro P., Fiore S., García-Infantes F., Gawlik-Ramie˛ga A., Gervino G., Gilardoni S., González-Romero E., Guerrero C., Gunsing F., Gustavino C., Heyse J., Hillman W., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Kaperoni K., Kaur G., Kimura A., Knapová I., Kokkoris M., Köster U., Krtička M., Kyritsis N., Lederer-Woods C., Lerner G., Manna A., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas† F., Musacchio-Gonzalez E., Musumarra A., Negret A., Pérez de Rada A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Pirovano E., Plaza J., Pomp S., Porras I., Praena J., Quesada J. M., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sánchez-Caballero A., Sabaté-Gilarte M., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Stamati M. E., Sturniolo A., Tagliente G., Tarrío D., Torres-Sánchez P., Vagena E., Valenta S., Variale V., Vaz P., Vecchio G., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., Zarrella R., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Radiative neutron-capture cross sections are of pivotal importance in many fields such as nucle-osynthesis studies or innovative reactor technologies. A large number of isotopes have been measured with high accuracy, but there are still a large number of relevant isotopes whose cross sections could not be experimentally determined yet, at least with sufficient accuracy and completeness, owing to limitations in detection techniques, sample production methods or in the facilities themselves. In the context of the HYMNS (High-sensitivitY Measurements of key stellar Nucleo-Synthesis reactions) project over the last six years we have developed a novel detection technique aimed at background suppression in radiative neutron-capture time-of-flight measurements. This new technique utilizes a complex detection set-up based on position-sensitive radiation-detectors deployed in a Compton-camera array configuration. The latter enables to implement gamma-ray imaging techniques, which help to disentangle true capture events arising from the sample under study and contaminant background events from the surroundings. A summary on the main developments is given in this contribution together with an update on recent experiments at CERN n_TOF and an outlook on future steps.

Published
2023
Full Text
View/download PDF

11. High resolution 80Se(n,γ) cross section measurement at CERN n_TOF

Author

Babiano-Suarez V., Balibrea-Correa J., Caballero-Ontanaya L., Domingo-Pardo C., Ladarescu I., Lerendegui-Marco J., Tain J. L., Calviño F., Casanovas A., Tarifeño-Saldivia A., Guerrero C., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Billowes J., Bosnar D., Brown A., Busso M., Caamaño M., Calviani M., Cano-Ott D., Cerutti F., Chiaveri E., Colonna N., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Damone L. A., Davies P. J., Diakaki M., Dietz M., Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domínguez B., Ferrari A., Finocchiaro P., Furman V., Göbel K., Garg R., Gawlik-Ramięga A., Gilardoni S., Gonçalves I. F., González-Romero E., Gunsing F., Harada H., Heinitz S., Heyse J., Jenkins D. G., Junghans A., Käppeler F., Kadi Y., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Lederer-Woods C., Leeb H., Lonsdale S. J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mingrone F., Moreno-Soto J., Musumarra A., Negret A., Nolte R., Ogállar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Persanti L., Petrone C., Pirovano E., Porras I., Praena J., Quesada J. M., Ramos-Doval D., Rauscher T., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Sprung P., Stamatopoulos A., Tagliente G., Tassan-Got L., Thomas Th., Torres-Sánchez 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., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Neutron capture cross section measurements of isotopes close to s-process branching-points are of fundamental importance for the understanding of this nucleosynthesis mechanism through which about 50% of the elements heavier than iron are produced. We present in this contribution the results corresponding to the high resolution measurement, for first time ever, of the 80Se(n, γ) cross section, in which 98 resonances never measured before have been reported. As a consequence, ten times more precise values for the MACS have been obtained compared to previous accepted value adopted in the astrophysical KADoNiS data base.

Published
2023
Full Text
View/download PDF

12. Neutron capture and total cross-section measurements on 94,95,96Mo at n_TOF and GELINA

Author

Mucciola R., Paradela C., Manna A., Alaerts G., Massimi C., Kopecky S., Mengoni A., Moens A., Schillebeeckx P., Wynants R., Aberle O., Alcayne V., Altieri S., Amaducci S., Amar Es-Sghir H., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea J., Bennett S., Bernardes A. P., Berthoumieux E., Bosnar D., Busso M., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Casanovas A., Castelluccio D. M., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Colombetti P., Colonna N., Console Camprini P. C., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Di Castro M., Diacono D., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., García-Infantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., González-Romero E., Guerrero C., Gunsing F., Gustavino C., Heyse J., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Katabuchi T., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lerner G., Martínez T., Masi A., Mastinu P., Mastromarco M., Matteucci F., Maugeri E. A., Mazzone A., Mendoza E., Michalopoulou V., Milazzo P. M., Murtas† F., Musacchio-Gonzalez E., Musumarra A., Negret A., Oprea A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Piersanti L., Pirovano E., Pomp S., Porras I., Praena J., Protti N., Quesada J. M., Rauscher T., Reifarth R., Rochman D., Romanets Y., Romano F., Rubbia C., Sánchez A., Sabaté-Gilarte M., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Spelta M., Stamati M. E., Tagliente G., Tarifeño-Saldivia A., Tarrío D., Terranova N., Torres-Sánchez P., Urlass S., Valenta S., Variale V., Vaz P., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Capture and total cross section measurements for 94,95,96Mo have been performed at the neutron time-of-flight facilities, n_TOF at CERN and GELINA at JRC-Geel. The measurements were performed using isotopically enriched samples with an enrichment above 95% for each of the 94,95,96Mo isotopes. The capture measurements were performed at n_TOF using C6D6 detectors and a new sTED detector. The transmission measurements were performed at a 10 m station of GELINA using a 6Li glass neutron detector. Preliminary results of these measurements are presented.

Published
2023
Full Text
View/download PDF

13. A segmented total energy detector (sTED) for (n, γ) cross section measurements at n_TOF EAR2

Author

Alcayne V., Cano-Ott D., Garcia J., González-Romero E., Martínez T., Mendoza E., Sánchez A., Plaza J., Balibrea-Correa J., Casanovas A., Domingo-Pardo C., Lerendegui-Marco J., Aberle O., Altieri S., Amaducci S., Amar Es-Sghir H., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea J., Bennett S., Bernardes A. P., Berthoumieux E., Bosnar D., Busso M., Caamaño M., Calviño F., Calviani M., Castelluccio D. M., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Colombetti P., Colonna N., Console Camprini P. C., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Di Castro M., Diacono D., Diakaki M., Dietz M., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., García-Infantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., Guerrero C., Gunsing F., Gustavino C., Heyse J., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Katabuchi T., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerner G., Manna A., Masi A., Massimi C., Mastinu P., Mastromarco M., Matteucci F., Maugeri E. A., Mazzone A., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas† F., Musacchio-Gonzalez E., Musumarra A., Negret A., Oprea A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Piersanti L., Pirovano E., Pomp S., Porras I., Praena J., Protti N., Quesada J. M., Rauscher T., Reifarth R., Rochman D., Romanets Y., Romano F., Rubbia C., Sabaté-Gilarte M., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Spelta M., Stamati M. E., Tagliente G., Tarifeño-Saldivia A., Tarrío D., Terranova N., Torres-Sánchez P., Urlass S., Valenta S., Variale V., Vaz P., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The neutron time-of-flight facility n_TOF is characterised by its high instantaneous neutron intensity, high-resolution and broad neutron energy spectra, specially conceived for neutron-induced reaction cross section measurements. Two Time-Of-Flight (TOF) experimental areas are available at the facility: experimental area 1 (EAR1), located at the end of the 185 m horizontal flight path from the spallation target, and experimental area 2 (EAR2), placed at 20 m from the target in the vertical direction. The neutron fluence in EAR2 is ˜ 300 times more intense than in EAR1 in the relevant time-of-flight window. EAR2 was designed to carry out challenging cross-section measurements with low mass samples (approximately 1 mg), reactions with small cross-sections or/and highly radioactive samples. The high instantaneous fluence of EAR2 results in high counting rates that challenge the existing capture systems. Therefore, the sTED detector has been designed to mitigate these effects. In 2021, a dedicated campaign was done validating the performance of the detector up to at least 300 keV neutron energy. After this campaign, the detector has been used to perform various capture cross section measurements at n_TOF EAR2.

Published
2023
Full Text
View/download PDF

14. miniBELEN: A modular neutron counter for (𝜶, 𝒏) reactions

Author

Mont-Geli N., Tarifeño-Saldivia A., Fraile L.M., Viñals S., Perea A., Pallàs M., Cortés G., Nácher E., Tain J.L., Alcayne V., Algora A., Balibrea-Correa J., Benito J., Borge M.J.G., Briz J.A., Calviño F., Cano-Ott D., De Blas A., Domingo-Pardo C., Fernández B., Garcia R., García G., Gómez-Camacho J., González-Romero E.M., Guerrero C., Lerendegui-Marco J., Llanos M., Martínez T., Mendoza E., Murias J.R., Orrigo S.E.A., Pérez de Rada A., Pesudo V., Plaza J., Quesada J.M., Sánchez A., Sánchez-Tembleque V., Santorelli R., Tengblad O., Udías J.M., and Villamarín D.

Subjects
Physics, QC1-999
Abstract

miniBELEN is a modular and transportable neutron moderated counter with a nearly flat neutron detection efficiency up to 10 MeV. Modularity implies that the moderator can be reassembled in different ways in order to obtain different types of response. The detector has been developed in the context of the Measurement of Alpha Neutron Yields (MANY) collaboration, which is a scientific effort aiming to carry out measurements of (𝛼, 𝑛) production yields, reaction cross-sections and neutron energy spectra. In this work we present and discuss several configurations of the miniBELEN detector. The experimental validation of the efficiency calculations using 252Cf sources and the measurement of the 27Al(𝛼, 𝑛) 30P reaction is also presented.

Published
2023
Full Text
View/download PDF

15. The n_TOF NEAR Station Commissioning and first physics case

Author

Stamati M. E., Torres-Sánchez P., Pérez-Maroto P., Cecchetto M., Goula S., Mastromarco M., Chasapoglou S., Beltrami C., Chiesa D., Manna A., Mucciola R., Patronis N., Praena J., Guerrero C., Colonna N., Mengoni A., Massimi C., Aberle O., Alcayne V., Altieri S., Amaducci S., Amar Es-Sghir H., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea J., Bennett S., Bernardes A. P., Berthoumieux E., Bosnar D., Busso M., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Casanovas A., Castelluccio D. M., Cerutti F., Cescutti G., Chiaveri E., Colombetti P., Console Camprini P. C., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Di Castro M., Diacono D., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., García-Infantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., González-Romero E., Gunsing F., Gustavino C., Heyse J., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Katabuchi T., Knapová I., Kokkoris M., Kopatch Y., Krticka M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lerner G., Martínez T., Masi A., Mastinu P., Matteucci F., Maugeri E. A., Mazzone A., Mendoza E., Michalopoulou V., Milazzo P. M., Murtas F., Musacchio-Gonzalez E., Musumarra A., Negret A., Oprea A., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Piersanti L., Pirovano E., Pomp S., Porras I., Protti N., Quesada J. M., Rauscher T., Reifarth R., Rochman D., Romanets Y., Romano F., Rubbia C., Sánchez A., Sabaté-Gilarte M., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Spelta M., Tagliente G., Tarifeño-Saldivia A., Taríro D., Terranova N., Urlass S., Valenta S., Variale V., Vaz P., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The NEAR Station is a new experimental area developed at the n_TOF Facility at CERN. The activation station of NEAR underwent a characterization of the beam following the installation of the new n_TOF Spallation Target. The commissioning of the neutron beam comprises a set of simulations made with the FLUKA code and experimental verification. The experimental determination of the neutron spectrum was made using activation techniques with three separate set-ups. Two set-ups were based on the Multi-foil Activation technique (MAM-1 and MAM-2), and the third set-up relied on the process of neutron moderation and activation of a single material (ANTILoPE). The three set-ups are presented. Also the present plans and future perspectives of the activation station of NEAR are discussed.

Published
2023
Full Text
View/download PDF

16. Characterisation of the n_TOF 20 m beam line at CERN with the new spallation target

Author

Pavón-Rodríguez J. A., Alcayne V., Amaducci S., Bacak M., Casanovas A., Cortés-Giraldo M. A., García-Infantes F., Lerendegui-Marco J., Manna A., Musacchio-Gonzalez E., Patronis N., Sabaté-Gilarte M., Stamati M. E., Tassan-Got L., Vlachoudis V., Aberle O., Altieri S., Amar Es-Sghir H., Andrzejewski J., Babiano-Suarez V., Balibrea J., Bennett S., Bernardes A. P., Berthoumieux E., Bosnar D., Busso M., Caamaño M., Alviño F., Calviani M., Cano-Ott D., Castelluccio D. M., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Colombetti P., Colonna N., Console Camprini P. C., Cortés G., Cosentino L., Cristallo S., Di Castro M., Diacono D., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., Gawlik-Ramięga A., Gervino G., Gilardoni S., González-Romero E., Guerrero C., Gunsing F., Gustavino C., Heyse J., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Katabuchi T., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerner G., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Matteucci F., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas† F., Musumarra A., Negret A., Oprea A., Pérez-Maroto P., Pellegriti M. G., Perkowski J., Petrone C., Piersanti L., Pirovano E., Pomp S., Porras I., Praena J., Protti N., Quesada J. M., Rauscher T., Reifarth R., Rochman D., Romanets Y., Romano F., Rubbia C., Sánchez A., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Spelta M., Tagliente G., Tarifeño-Saldivia A., Tarrío D., Terranova N., Torres-Sánchez P., Urlass S., Valenta S., Variale V., Vaz P., Vescovi D., Vlastou R., Wallner A., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The n_TOF facility hosts CERN’s pulsed neutron source, comprising two beam lines of different flight paths and one activation station. It is based on a proton beam delivered by the PS accelerator impinging on a lead spallation target. During Long Shutdown 2 (LS2) at CERN (2019-2021), a major upgrade of the spallation target was carried out in order to optimize the performances of the neutron beam. Therefore, the characteristics of n_TOF two experimental areas were investigated in detail. In this work, the focus is on the second experimental area (EAR2), located 20 m above the spallation target. Preliminary results of the neutron energy distribution and beam line energy resolution are presented, compared to previous experimental campaigns and Monte Carlo simulations with the FLUKA code. Moreover, preliminary results of the spatial beam profile measurements are shown.

Published
2023
Full Text
View/download PDF

17. First high resolution measurement of neutron capture resonances in 176Yb at the n_TOF CERN facility

Author

García-Infantes F., Praena J., Casanovas A., Mastromarco M., Aberle O., Alcayne V., Altieri S., Amaducci S., Amar Es-Sghir H., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea J., Bennett S., Bernardes A.P., Berthoumieux E., Bosnar D., Busso M., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Castelluccio D.M., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Colombetti P., Colonna N., Console Camprini P.C., Coréts G., Cortés-Giraldo M.A., Cosentino L., Cristallo S., Di Castro M., Diacono D., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Duarn I., Eleme Z., Fargier S., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., Gawlik-Ramięga A., Gervino G., Gilardoni S., González-Romero E., Guerrero C., Gunsing F., Gustavino C., Heyse J., Jenkins D.G., Jericha E., Junghans A., Kadi Y., Katabuchi T., Knapova I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lerner G., Manna A., Martínez T., Masi A., Massimi C., Mastinu P., Atteucci F., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas F., Musacchio-Gonzalez E., Musumarra A., Negret A., Oprea A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Piersanti L., Pirovano E., Pomp S., Porras I., Protti N., Quesada J. M., Rauscher T., Reifarth R., Ochman D., Romanets Y., Romano F., Rubbia C., Sánchez A., Sabaté-Gilarte M., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Spelta M., Stamati M. E., Tagliente G., Tarifeño-Saldivia A., Tarrío D., Terranova N., Torres-Sánchez P., Urlass S., Valenta S., Variale V., Vaz P., Vescovi D., Vlachoudis V., Lastou R., Wallner A., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Several international agencies recommend the study of new routes and new facilities for producing radioisotopes with application to nuclear medicine. 177Lu is a versatile radioisotope used for therapy and diagnosis (theranostics) of cancer with good success in neuroendocrine tumours that is being studied to be applied to a wider range of tumours. 177Lu is produced in few nuclear reactors mainly by the neutron capture on 176Lu. However, it could be produced at high-intensity celeratorbased neutron facilities. The energy of the neutrons in accelerator-based neutron facilities is higher than in thermal reactors.Thus, experimental data on the 176Yb(n,γ) cross-section in the eV and keV region are mandatory to calculate accurately the production of 177Yb, which beta decays to 177Lu. At present, there are not experimental data available from thermal to 3 keV of the 176Yb(n,γ) cross-section. In addition, there is no data in the resolved resonance region (RRR). This contribution shows the first results of the 176Yb capture measurement performed at the n_TOF facility at CERN.

Published
2023
Full Text
View/download PDF

18. First measurement of the 94Nb(n,γ) cross section at the CERN n_TOF facility

Author

Balibrea-Correa J., Babiano-Suárez V., Lerendegui-Marco J., Domingo-Pardo C., Ladarescu I., Tarifeño-Saldivia A., Alcayne V., Cano-Ott D., González-Romero E., Martínez T., Mendoza E., Guerrero C., Calviño F., Casanovas A., Köster U., Chiera N. M., Dressler R., Maugeri E. A., Schumann D., Aberle O., Altieri S., Amaducci S., Andrzejewski J., Bacak M., Beltrami C., Bennett S., Bernardes A. P., Berthoumieux E., Beyer R., Boromiza M., Bosnar D., Caamaño M., Calviani M., Cerutti F., Cescutti G., Chiaveri E., Colombetti P., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Dellmann S., Di Castro M., Di Maria S., Diakaki M., Dietz M., Dupont E., Durán I., Eleme Z., Fargier S., Fernández B., Fernández-Domínguez B., Finocchiaro P., Fiore S., García-Infantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., Gunsing F., Gustavino C., Heyse J., Hillman W., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Kaperoni K., Kaur G., Kimura A., Knapová I., Kokkoris M., Krtička M., Kyritsis N., Lederer-Woods C., Lerner G., Manna A., Masi A., Massimi C., Mastinu P., Mastromarco M., Mazzone A., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas F., Musacchio-Gonzalez E., Musumarra A., Negret A., Pérez de Rada A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Pirovano E., Plaza J., Pomp S., Porras I., Praena J., Quesada J. M., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sánchez-Caballero A., Sabaté-Gilarte M., Schillebeeckx P., Sekhar A., Smith A. G., Sosnin N. V., Stamati M. E., Sturniolo A., Tagliente G., Tarrío D., Torres-Sánchez P., Vagena E., Valenta S., Variale V., Vaz P., Vecchio G., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., Zarrella R., and Žugec P.

Subjects
Physics, QC1-999
Abstract

One of the crucial ingredients for the improvement of stellar models is the accurate knowledge of neutron capture cross-sections for the different isotopes involved in the s-,r- and i- processes. These measurements can shed light on existing discrepancies between observed and predicted isotopic abundances and help to constrain the physical conditions where these reactions take place along different stages of stellar evolution. In the particular case of the radioactive 94Nb, the 94Nb(n,γ) cross-section could play a role in the determination of the s-process production of 94Mo in AGB stars, which presently cannot be reproduced by state-of-the-art stellar models. There are no previous 94Nb(n,γ) experimental data for the resolved and unresolved resonance regions mainly due to the difficulties in producing highquality samples and also due to limitations in conventional detection systems commonly used in time-of-flight experiments. Motivated by this situation, a first measurement of the 94Nb(n,γ) reaction was carried out at CERN n_TOF, thereby exploiting the high luminosity of the EAR2 area in combination with a new detection system of small-volume C6D6-detectors and a high quality 94Nb-sample. The latter was based on hyper-pure 93Nb material activated at the high-flux reactor of ILL-Grenoble. An innovative ring-configuration detection system in close geometry around the capture sample allowed us to significantly enhance the signal-to-background ratio. This set-up was supplemented with two conventional C6D6-detectors and a highresolution LaCl3(Ce)-detector, which will be employed for addressing reliably systematic effects and uncertainties. At the current status of the data analysis, 18 resonance in 94Nb+n have been observed for the first time in the neutron energy range from thermal up to 10 keV.

Published
2023
Full Text
View/download PDF

19. Neutron-induced cross section measurements

Author

Massimi C., Aberle O., Alcayne V., Altieri S., Amaducci S., Andrzejewski J., Babiano-Suarez V., Bacak M., Balibrea J., Beltrami C., Bennett S., Bernardes A. P., Berthoumieux E., Boromiza M., Bosnar D., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Casanovas A., Castelluccio D. M., Cerutti F., Cescutti G., Chasapoglou S., Chiaveri E., Colombetti P., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Dellmann S., Di Castro M., Di Maria S., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Eleme Z., Fargier S., Fernández B., Fernández-Domínguez B., Finocchiaro P., Fiore S., Furman V., GarcíaInfantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., González-Romero E., Guerrero C., Gunsing F., Gustavino C., Heyse J., Hillman W., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Kaperoni K., Kaur G., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kyritsis N., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lerner G., Manna A., Martínez T., Masi A., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas F., Musacchio-Gonzalez E., Musumarra A., Negret A., Pérez de Rada A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Pirovano E., Plaza J., Pomp S., Porras I., Praena J., Quesada J. M., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sánchez A., Sabaté-Gilarte M., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Stamati M. E., Sturniolo A., Tagliente G., Tarrío D., Torres-Sánchez P., Urlass S., Vagena E., Valenta S., Variale V., Vaz P., Vecchio G., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., Zarrella R., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Neutron-induced cross sections represent the main nuclear input to models of stellar and Big-Bang nucleosynthesis. While (n,γ) reactions are relevant for the formation of elements heavier than iron, (n,p) and (n,α) reactions can play an important role in specific cases. The time-of-flight method is routinely used at n_TOF to experimentally determine the cross section data. In addition, recent upgrades of the facility will allow the use of activation techniques as well, possibly opening the way to a systematic study of neutron interaction with radioactive isotopes. In the last 20 years n_TOF has provided a large amount of experimental data for Nuclear Astrophysics. Our plan is to carry on challenging measurements and produce nuclear data in the next decades as well.

Published
2023
Full Text
View/download PDF

20. New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements

Author

Lerendegui-Marco J., Babiano-Suárez V., Balibrea-Correa J., Domingo-Pardo C., Ladarescu I., Tarifeño-Saldivia A., Alcayne V., Cano-Ott D., González-Romero E., Martínez T., Mendoza E., Guerrero C., Calviño F., Casanovas A., Köster U., Chiera N. M., Dressler R., Maugeri E. A., Schumann D., Aberle O., Altieri S., Amaducci S., Andrzejewski J., Bacak M., Beltrami C., Bennett S., Bernardes A. P., Berthoumieux E., Beyer R., Boromiza M., Bosnar D., Caamaño M., Calviani M., Cerutti F., Cescutti G., Chiaveri E., Colombetti P., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Dellmann S., Di Castro M., Di Maria S., Diakaki M., Dietz M., Dupont E., Durán I., Eleme Z., Fargier S., Fernández B., Fernández-Domínguez B., Finocchiaro P., Fiore S., García-Infantes F., Gawlik-Ramięga A., Gervino G., Gilardoni S., Gunsing F., Gustavino C., Heyse J., Hillman W., Jenkins D. G., Jericha E., Junghans A., Kadi Y., Kaperoni K., Kaur G., Kimura A., Knapová I., Kokkoris M., Krtička M., Kyritsis N., Lederer-Woods C., Lerner G., Manna A., Masi A., Massimi C., Mastinu P., Mastromarco M., Mazzone A., Mengoni A., Michalopoulou V., Milazzo P. M., Mucciola R., Murtas F., Musacchio-Gonzalez E., Musumarra A., Negret A., Pérez de Rada A., Pérez-Maroto P., Patronis N., Pavón-Rodríguez J. A., Pellegriti M. G., Perkowski J., Petrone C., Pirovano E., Plaza J., Pomp S., Porras I., Praena J., Quesada J. M., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sánchez-Caballero A., Sabaté-Gilarte M., Schillebeeckx P., Sekhar A., Smith A. G., Sosnin N. V., Stamati M. E., Sturniolo A., Tagliente G., Tarrío D., Torres-Sánchez P., Vagena E., Valenta S., Variale V., Vaz P., Vecchio G., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., Zarrella R., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant and massive stars. However, neutron capture measurements via the time-of-flight (TOF) technique on key s-process nuclei are often challenging. Difficulties arise from the limited mass (∼mg) available and the high sample-related background in the case of the unstable s-process branching points. Measurements on neutron magic nuclei, that act as s-process bottlenecks, are affected by low (n,γ) cross sections and a dominant neutron scattering background. Overcoming these experimental challenges requires the combination of facilities with high instantaneous flux, such as n_TOFEAR2, with detection systems with an enhanced detection sensitivity and high counting rate capabilities. This contribution reviews some of the latest detector developments in detection systems for (n,γ) measurements at n_TOF, such as i-TED, an innovative detection system which exploits the Compton imaging technique to reduce the dominant neutron scattering background and s-TED, a highly segmented total energy detector intended for high flux facilities. The discussion will be illustrated with results of the first measurement of key the s-process branching-point reaction 79Se(n,γ).

Published
2023
Full Text
View/download PDF

21. β-delayed neutron spectroscopy of 85,86As with MONSTER.

Author

Pérez de Rada, A., Cano-Ott, D., Martínez, T., Alcayne, V., Mendoza, E., Plaza, J., Sanchez-Caballero, A., Villamarín, D., Äystö, J., Jokinen, A., Kankainen, A., Penttilä, H., Rinta-Antila, S., Agramunt, J., Algora, A., Domingo-Pardo, C., Lerendegui-Marco, J., Taín, J.L., Banerjee, K., and Bhattacharya, C.

Subjects
NEUTRONS, TIME-of-flight mass spectrometry, TECHNOLOGICAL innovations, SPECTRAL energy distribution, BAYESIAN analysis
Abstract

The β-delayed neutron emission in the 85,86As β-decays has been measured at the IGISOL facility of the Accelerator Laboratory of the University of Jyväskylä (JYFL-ACCLAB). The complete β-decays have been studied with a complex setup that consists of a plastic scintillator, the MOdular Neutron time-of-flight SpectromeTER (MONSTER), and two types of γ-ray detectors—an HPGe clover and four LaBr3 crystals. The β-delayed neutron energy distributions have been determined by unfolding the TOF spectra with an innovative methodology based on the iterative Bayesian unfolding method and accurate Monte Carlo simulations. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

22. Simultaneous neutron and gamma imaging system for real time range and dose monitoring in Hadron Therapy and nuclear security applications

Author

Lerendegui-Marco J., Balibrea-Correa J., Babiano-Suárez V., Caballero L., Domingo-Pardo C., and Ladarescu I.

Subjects
Physics, QC1-999
Abstract

GN-Vision is a novel dual γ-ray and neutron imaging system, which aims at imaging, simultaneously to the prompt gammas, the spatial origin of the slow and thermal neutron dose (

Published
2022
Full Text
View/download PDF

23. First 80Se(n,γ) cross section measurement with high resolution in the full stellar energy range 1 eV - 100 keV and its astrophysical implications for the s-process

Author

Babiano-Suarez V., Balibrea-Correa J., Caballero-Ontanaya L., Domingo-Pardo C., Ladarescu I., Lerendegui-Marco J., Tain J. L., Calviño F., Casanovas A., Tarifeño-Saldivia A., Guerrero C., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Billowes J., Bosnar D., Brown A., Busso M., Caamaño M., Calviani M., Cano-Ott D., Cerutti F., Chiaveri E., Colonna N., Cortés G., CortésGiraldo M. A., Cosentino L., Cristallo S., Damone L. A., Davies P. J., Diakaki M., Dietz M., Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domínguez B., Ferrari A., Finocchiaro P., Furman V., Göbel K., Garg R., Gawlik-Ramięga A., Gilardoni S., Gonçalves I. F., González-Romero E., Gunsing F., Harada H., Heinitz S., Heyse J., Jenkins D. G., Junghans A., Käppeler F., Kadi Y., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Lederer-Woods C., Leeb H., Lonsdale S. J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Mingrone F., Moreno-Soto J., Musumarra A., Negret A., Nolte R., Ogállar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Persanti L., Petrone C., Pirovano E., Porras I., Praena J., Quesada J. M., Ramos-Doval D., Rauscher T., Reifarth R., Rochman D., Romanets Y., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N. V., Sprung P., Stamatopoulos A., Tagliente G., Tassan-Got L., Thomas Th., Torres-Sánchez 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., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Most elements heavier than iron have been generated in the stellar media by means of neutron capture reactions, approximately half are produced by the slow neutron capture or s-process. Radiative neutron capture cross section measurements are of fundamental importance for the study of this mechanism. In this contribution we present a brief summary on the measurement and results for the 80Se(n,γ) cross-section. The experiment was carried out at CERN n_TOF EAR1 via the time of flight (ToF) technique, using four C6D6 scintillation detectors with very fast response. More than a hundred new resonances have been analyzed for the first time with a high accuracy. The MACS obtained at kT = 8 keV is 36% smaller than the recommended value in KADo-NiS. Some of the astrophysical implications of this result are elucidated in this contribution.

Published
2022
Full Text
View/download PDF

24. Compton Imaging and Machine-Learning techniques for an enhanced sensitivity in key stellar (n,γ) measurements

Author

Lerendegui-Marco J., Babiano-Suárez V., Balibrea-Correa J., Caballero L., Calvo D., Domingo-Pardo C., Ladarescu I., Real D., Calviño F., Casanovas A., Tarifeño-Saldivia A., Alcayne V., Guerrero C., Millán-Callado M.A., Rodríguez-González T., Barbagallo M., Chiera N.M, Dressler R., Heinitz S., Maugeri E.A, Schumann D., and Köster U.

Subjects
Physics, QC1-999
Abstract

Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant stars. To enhance the sensitivity of such measurements we have developed the i-TED detector. i-TED is an innovative detection system which exploits the Compton imaging technique with the aim of obtaining information about the incoming direction of the detected γ-rays. The imaging capability allows one to reject a large fraction of the dominant γ-ray background, hence enhancing the (n,γ) detection sensitivity. This work summarizes the main results of the first experimental proof-of-concept of the background rejection with i-TED carried out at CERN n_TOF using an early i-TED demonstrator. Two state-of-the-art C6D6 detectors were also used to benchmark the performance of i-TED. The i-TED prototype built for this study shows a factor of ~3 higher detection sensitivity than C6D6 detectors in the ~10 keV neutron-energy range of astrophysical interest. This works also introduces the perspectives of further enhancement in performance attainable with the final i-TED array and new analysis methodologies based on Machine-Learning techniques. The latter provide higher (n,γ) detection efficiency and similar enhancement in the sensitivity than the analytical method based on the Compton scattering law. Finally, we present our proposal to use this detection system for the first time on key astrophysical (n,γ) measurements, in particular on the s-process branching-point 79Se, which is especially well suited to constrain the thermal conditions of Red Giant and Massive Stars.

Published
2022
Full Text
View/download PDF

25. Characterization of a detector setup for the measurement of the 235U(n,f) cross section relative to n-p scattering up to 500 MeV at the n_TOF facility at CERN

Author

Manna, A., primary, Pirovano, E., additional, Colonna, N., additional, Castelluccio, D., additional, Console Camprini, P., additional, Cosentino, L., additional, Dietz, M., additional, Ducasse, Q., additional, Finocchiaro, P., additional, Le Naour, C., additional, Massimi, C., additional, Mengoni, A., additional, Nolte, R., additional, Tassan-Got, L., additional, Terranova, N., additional, Vannini, G., additional, Ventura, A., additional, Aberle, O., additional, Alcayne, V., additional, Amaducci, S., additional, Andrzejewski, J., additional, Audouin, L., additional, Babiano-Suarez, V., additional, Bacak, M., additional, Barbagallo, M., additional, Bennett, S., additional, Berthoumieux, E., additional, Billowes, J., additional, Bosnar, D., additional, Brown, A., additional, Busso, M., additional, Caamaño, M., additional, Caballero-Ontanaya, L., additional, Calviño, F., additional, Calviani, M., additional, Cano-Ott, D., additional, Casanovas, A., additional, Cerutti, F., additional, Chiaveri, E., additional, Cortés, G., additional, Cortés-Giraldo, M. A., additional, Cristallo, S., additional, Damone, L. A., additional, Davies, P. J., additional, Diakaki, M., additional, Domingo-Pardo, C., additional, Dressler, R., additional, Dupont, E., additional, Durán, I., additional, Eleme, Z., additional, Fernández-Domínguez, B., additional, Ferrari, A., additional, Göbel, K., additional, Garg, R., additional, Gawlik-Ramiega, R. A., additional, Gilardoni, S., additional, Gonçalves, I. F., additional, González-Romero, E., additional, Guerrero, C., additional, Gunsing, F., additional, Harada, H., additional, Heinitz, S., additional, Heyse, J., additional, Jenkins, D. G., additional, Junghans, A., additional, Käppeler, F., additional, Kadi, Y., additional, Kimura, A., additional, Knapová, I., additional, Kokkoris, M., additional, Krtička, M., additional, Kurtulgil, D., additional, Ladarescu, I., additional, Lederer-Woods, C., additional, Leeb, H., additional, Lerendegui-Marco, J., additional, Lonsdale, S. J., additional, Macina, D., additional, Martínez, T., additional, Masi, A., additional, Mastinu, P., additional, Mastromarco, M., additional, Maugeri, E. A., additional, Mazzone, A., additional, Mendoza, E., additional, Michalopoulou, V., additional, Milazzo, P. M., additional, Mingrone, F., additional, Moreno-Soto, J., additional, Musumarra, A., additional, Negret, A., additional, Ogállar, F., additional, Oprea, A., additional, Patronis, N., additional, Pavlik, A., additional, Perkowski, J., additional, Piersanti, L., additional, Petrone, C., additional, Porras, I., additional, Praena, J., additional, Quesada, J. M., additional, Ramos-Doval, D., additional, Rauscher, T., additional, Reifarth, R., additional, Rochman, D., additional, Rubbia, C., additional, Sabaté-Gilarte, M., additional, Saxena, A., additional, Schillebeeckx, P., additional, Schumann, D., additional, Sekhar, A., additional, Smith, A. G., additional, Sosnin, N. V., additional, Sprung, P., additional, Stamatopoulos, A., additional, Tagliente, G., additional, Tain, J. L., additional, Tarifeño-Saldivia, A., additional, Thomas, Th., additional, Torres-Sánchez, P., additional, Tsinganis, A., additional, Ulrich, J., additional, Urlass, S., additional, Valenta, S., additional, Variale, V., additional, Vaz, P., additional, Vescovi, D., additional, Vlachoudis, V., additional, Vlastou, R., additional, Wallner, A., additional, Woods, P. J., additional, Wright, T., additional, and Žugec, P., additional

Published
2023
Full Text
View/download PDF

26. Detector set up for the measurements of the neutron-induced fission cross section of 235U relative to n-p scattering up to 150 MeV at CERN-n_TOF

Author

Pirovano, E., primary, Manna, A., additional, Colonna, N., additional, Console Camprini, P., additional, Cosentino, L., additional, Dietz, M., additional, Ducasse, Q., additional, Finocchiaro, P., additional, Massimi, C., additional, Mengoni, A., additional, Nolte, R., additional, Radeck, D., additional, Tassan-Got, L., additional, Terranova, N., additional, Ventura, A., additional, Aberle, O., additional, Alcayne, V., additional, Amaducci, S., additional, Andrzejewski, J., additional, Audouin, L., additional, Babiano-Suarez, V., additional, Bacak, M., additional, Barbagallo, M., additional, Bennett, S., additional, Berthoumieux, E., additional, Billowes, J., additional, Bosnar, D., additional, Brown, A., additional, Busso, M., additional, Caamaño, M., additional, Caballero-Ontanaya, L., additional, Calviño, F., additional, Calviani, M., additional, Cano-Ott, D., additional, Casanovas, A., additional, Cerutti, F., additional, Chiaveri, E., additional, Cortés, G., additional, Cortés-Giraldo, M. A., additional, Cristallo, S., additional, Damone, L. A., additional, Davies, P. J., additional, Diakaki, M., additional, Domingo-Pardo, C., additional, Dressler, R., additional, Dupont, E., additional, Durán, I., additional, Eleme, Z., additional, Fernández-Domínguez, B., additional, Ferrari, A., additional, Göbel, K., additional, Garg, R., additional, Gawlik-Ramie˛ga, A., additional, Gilardoni, S., additional, Gonçalves, I. F., additional, González-Romero, E., additional, Guerrero, C., additional, Gunsing, F., additional, Harada, H., additional, Heinitz, S., additional, Heyse, J., additional, Jenkins, D. G., additional, Junghans, A., additional, Käppeler†, F., additional, Kadi, Y., additional, Kimura, A., additional, Knapová, I., additional, Kokkoris, M., additional, Krtička, M., additional, Kurtulgil, D., additional, Ladarescu, I., additional, Lederer-Woods, C., additional, Leeb, H., additional, Lerendegui-Marco, J., additional, Lonsdale, S. J., additional, Macina, D., additional, Martínez, T., additional, Masi, A., additional, Mastinu, P., additional, Mastromarco, M., additional, Maugeri, E. A., additional, Mazzone, A., additional, Mendoza, E., additional, Michalopoulou, V., additional, Milazzo, P. M., additional, Mingrone, F., additional, Moreno-Soto, J., additional, Musumarra, A., additional, Negret, A., additional, Ogállar, F., additional, Oprea, A., additional, Patronis, N., additional, Pavlik, A., additional, Perkowski, J., additional, Piersanti, L., additional, Petrone, C., additional, Porras, I., additional, Praena, J., additional, Quesada, J. M., additional, Ramos-Doval, D., additional, Rauscher, T., additional, Reifarth, R., additional, Rochman, D., additional, Rubbia, C., additional, Sabaté-Gilarte, M., additional, Saxena, A., additional, Schillebeeckx, P., additional, Schumann, D., additional, Sekhar, A., additional, Smith, A. G., additional, Sosnin, N. V., additional, Sprung, P., additional, Stamatopoulos, A., additional, Tagliente, G., additional, Tain, J. L., additional, Tarifeño-Saldivia, A., additional, Thomas, Th., additional, Torres-Sánchez, P., additional, Tsinganis, A., additional, Ulrich, J., additional, Urlass, S., additional, Valenta, S., additional, Vannini, G., additional, Variale, V., additional, Vaz, P., additional, Vescovi, D., additional, Vlachoudis, V., additional, Vlastou, R., additional, Wallner, A., additional, Woods, P. J., additional, Wright, T., additional, and Žugec, P., additional

Published
2023
Full Text
View/download PDF

27. Overview of the dissemination of n_TOF experimental data and resonance parameters

Author

Dupont, E., primary, Otuka, N., additional, Rochman, D., additional, Nogèure, G., additional, Aberle, O., additional, Alcayne, V., additional, Altieri, S., additional, Amaducci, S., additional, Andrzejewski, J., additional, Babiano-Suarez, V., additional, Bacak, M., additional, Balibrea, J., additional, Beltrami, C., additional, Bennett, S., additional, Bernardes, A.P., additional, Berthoumieux, E., additional, Beyer, R., additional, Boromiza, M., additional, Bosnar, D., additional, Caamaño, M., additional, Calviño, F., additional, Calviani, M., additional, Cano-Ott, D., additional, Casanovas, A., additional, Cerutti, F., additional, Cescutti, G., additional, Chiaveri, E., additional, Colombetti, P., additional, Colonna, N., additional, Console Camprini, P., additional, Cortés, G., additional, Cortés-Giraldo, M.A., additional, Cosentino, L., additional, Cristallo, S., additional, Dellmann, S., additional, Di Castro, M., additional, Di Maria, S., additional, Diakaki, M., additional, Dietz, M., additional, Domingo-Pardo, C., additional, Dressler, R., additional, Durán, I., additional, Eleme, Z., additional, Fargier, S., additional, Fernández, B., additional, Fernández-Domínguez, B., additional, Finocchiaro, P., additional, Fiore, S., additional, Furman, V., additional, García-Infantes, F., additional, Gawlik-Ramięga, A., additional, Gervino, G., additional, Gilardoni, S., additional, González-Romero, E., additional, Guerrero, C., additional, Gunsing, F., additional, Gustavino, C., additional, Heyse, J., additional, Hillman, W., additional, Jenkins, G.D., additional, Jericha, E., additional, Junghans, A., additional, Kadi, Y., additional, Kaperoni, K., additional, Kaur, G., additional, Kimura, A., additional, Knapová, I., additional, Kokkoris, M., additional, Kopatch, Y., additional, Krtička, M., additional, Kyritsis, N., additional, Ladarescu, I., additional, Lederer-Woods, C., additional, Lerendegui-Marco, J., additional, Lerner, G., additional, Manna, A., additional, Martínez, T., additional, Masi, A., additional, Massimi, C., additional, Mastinu, P., additional, Mastromarco, M., additional, Maugeri, E.A., additional, Mazzone, A., additional, Mendoza, E., additional, Mengoni, A., additional, Michalopoulou, V., additional, Milazzo, P.M., additional, Mucciola, R., additional, Murtas, F., additional, Musacchio-Gonzalez, E., additional, Musumarra, A., additional, Negret, A., additional, Pérez de Rada, A., additional, Pérez-Maroto, P., additional, Patronis, N., additional, Pavón-Rodrgíuez, J.A., additional, Pellegriti, M.G., additional, Perkowski, J., additional, Petrone, C., additional, Pirovano, E., additional, Plaza, J., additional, Pomp, S., additional, Porras, I., additional, Praena, J., additional, Quesada, J.M., additional, Reifarth, R., additional, Romanets, Y., additional, Rubbia, C., additional, Sánchez-Caballero, A., additional, Sabaté-Gilarte, M., additional, Schillebeeckx, P., additional, Schumann, D., additional, Sekhar, A., additional, Smith, A.G., additional, Sosnin, N.V., additional, Stamati, M.E., additional, Sturniolo, A., additional, Tagliente, G., additional, Tarifeño-Saldivia, A., additional, Taríro, D., additional, Torres-Sánchez, P., additional, Vagena, E., additional, Valenta, S., additional, Variale, V., additional, Vaz, P., additional, Vecchio, G., additional, Vescovi, D., additional, Vlachoudis, V., additional, Vlastou, R., additional, Wallner, A., additional, Woods, P.J., additional, Wright, T., additional, Zarrella, R., additional, and Žugec, P., additional

Published
2023
Full Text
View/download PDF

28. The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF.

Author

Dietz, M., Lederer-Woods, C., Tattersall, A., Battino, U., Gunsing, F., Heinitz, S., Lerendegui-Marco, J., Krtička, M., Reifarth, R., Valenta, S., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Bacak, M., Balibrea, J., Barbagallo, M., Bečvář, F., Berthoumieux, E., and Billowes, J.

Subjects
NUCLEAR cross sections, WEAK interactions (Nuclear physics), TIME-of-flight mass spectrometry, NUCLEAR physics, NEUTRON temperature
Abstract

The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The 72Ge(n, γ) Maxwellian-Averaged Cross Section (MACS) has an important influence on the production of isotopes between Ge and Zr in the weak s-process in massive stars and so far only theoretical estimations are available. An experiment was carried out at the neutron time-of-flight facility n_TOF at CERN to measure the 72Ge(n, γ) reaction for the first time at stellar neutron energies. The capture measurement was performed using an enriched 72GeO2 sample at a flight path length of 184 m, which provided high neutron energy resolution. The prompt gamma rays produced after neutron capture were detected with a set of liquid scintillation detectors (C6D6). The neutron capture yield is derived from the counting spectra taking into account the neutron flux and the gamma-ray detection efficiency using the Pulse Height Weighting Technique. Over 70 new neutron resonances were identified, providing an improved resolved reaction cross section to calculate experimental MACS values for the first time. The experiment, data analysis and the new MACS results will be presented including their impact on stellar nucleosynthesis, which was investigated using the post-processing nucleosynthesis code mppnp for a 25 solar mass model. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

29. High resolution 80Se(n,γ) cross section measurement at CERN n_TOF.

Author

Babiano-Suarez, V., Balibrea-Correa, J., Caballero-Ontanaya, L., Domingo-Pardo, C., Ladarescu, I., Lerendegui-Marco, J., Tain, J. L., Calviño, F., Casanovas, A., Tarifeño-Saldivia, A., Guerrero, C., Aberle, O., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Bacak, M., Barbagallo, M., Bennett, S., and Berthoumieux, E.

Subjects
NEUTRON capture, NUCLEAR cross sections, NUCLEOSYNTHESIS, BRANCHING ratios, ISOTOPES
Abstract

Neutron capture cross section measurements of isotopes close to s-process branching-points are of fundamental importance for the understanding of this nucleosynthesis mechanism through which about 50% of the elements heavier than iron are produced. We present in this contribution the results corresponding to the high resolution measurement, for first time ever, of the 80Se(n, γ) cross section, in which 98 resonances never measured before have been reported. As a consequence, ten times more precise values for the MACS have been obtained compared to previous accepted value adopted in the astrophysical KADoNiS data base. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

30. Measurement of the energy-differential cross-section of the 12C(n,p)12B and 12C(n,d)11B reactions at the n_TOF facility at CERN

Author

Barbagallo M., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Bennett S., Berthoumieux E., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Cano-Ott D, Casanovas A., Cerutti F., Chiaveri E., Colonna N., Cortés G. P., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Damone L. A., Davies P. J., Diakaki M., Dietz M., Domingo-Pardo C, Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Jiri U., Junghans A., Kadi Y., Käppeler F., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lonsdale S.-J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P. F., Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Millán-Callado M. A., Mingrone F., Moreno-Soto J, Musumarra A., Negret A., Ogállar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J. M., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabaté- Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A. E., Tassan-Got L, Thomas B., Torres-Sánchez P., Tsinganis A., 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. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Although the 12C(n,p)12B and 12C(n,d)11B reactions are of interest in several fields of basic and applied Nuclear Physics the present knowledge of these two cross-sections is far from being accurate and reliable, with both evaluations and data showing sizable discrepancies. As part of the challenging n_TOF program on (n,cp) nuclear reactions study, the energy differential cross-sections of the 12C(n,p)12B and 12C(n,d)11 B reactions have been measured at CERN from the reaction thresholds up to 30 MeV neutron energy. Both measurements have been recently performed at the long flight-path (185 m) experimental area of the n_TOF facility at CERN using a pure (99.95%) rigid graphite target and two silicon telescopes. In this paper an overview of the experiment is presented together with a few preliminary results.

Published
2020
Full Text
View/download PDF

31. Measurement and analysis of 155,157Gd(n,γ) from thermal energy to 1 keV

Author

Massimi C., Aberle O., Andrzejewski J., Audouin L., Bacak M., Balibrea J., Barbagallo M., Bečvář F., Berthoumieux E., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani M., Cano-Ott D, Cardella R., Casanovas A., Castelluccio D. M., Cerutti F., Chen Y. H., Chiaveri E., Clai G., Colonna N., Console Camprini P., Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Diakaki M., Domingo-Pardo C, Dressler R., Dupont E., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Göbel K., García A. R., Gawlik A., Gilardoni S., Glodariu T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Guglielmelli A., Gunsing F., Harada H., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krtička M., Kurtulgil D., Leal-Cidoncha E, Lederer C., Leeb H., Lerendegui-Marco J, Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez T., Masi A., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Milazzo P. M., Mingrone F., Mucciola R., 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., Rocchi F., Rubbia C., Ryan J. A., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sedyshev P., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L, Tarifeño-Saldivia A., Tassan-Got L, Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Warren S., Weiss C., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

We have measured the capture cross section of the 155Gd and 157Gd isotopes between 0.025 eV and 1 keV. The capture events were recorded by an array of 4 C6D6 detectors, and the capture yield was deduced exploiting the total energy detection system in combination with the Pulse Height Weighting Techniques. Because of the large cross section around thermal neutron energy, 4 metallic samples of different thickness were used to prevent problems related to self-shielding. The samples were isotopically enriched, with a cross contamination of the other isotope of less than 1.14%. The capture yield was analyzed with an R-Matrix code to describe the cross section in terms of resonance parameters. Near thermal energies, the results are significantly different from evaluations and from previous time-of-flight experiments. The data from the present measurement at n_TOF are publicly available in the experimental nuclear reaction database EXFOR.

Published
2020
Full Text
View/download PDF

32. First results of the 241Am(n,f) cross section measurement at the Experimental Area 2 of the n_TOF facility at CERN

Author

Eleme Z., Patronis N., Stamatopoulos A., Tsinganis A., Kokkoris M., Michalopoulou V., Diakaki M., Vlastou R., Tassan-Got L, Colonna N., Heyse J., Barbagallo M., Mastromarco M., Macina D., Chiaveri E., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Bennett S., Berthoumieux E., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Cano-Ott D, Casanovas A., Cerutti F., Cortés G. P., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Damone L. A., Davies P. J., Dietz M., Domingo-Pardo C, Dressler R., Ducasse Q., Dupont E., Durán I., Fernández-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Jenkins D. G., Jericha E., Jiri U., Junghans A., Kadi Y., Käppeler F., Kimura A., Knapová I., Kopatch Y., Krticˇka M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lonsdale S. J., Manna A., Martínez T., Masi A., Massimi C., Mastinu P. F., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Milazzo P. M., Millán-Callado M. A., Mingrone F., Moreno-Soto J, Musumarra A., Negret A., Ogállar F., Oprea A., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J. M., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N., Sprung P., Tagliente G., Tain J. L., Tarifeño-Saldivia A. E., Thomas B., Torres-Sánchez P., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Wallner A., Woods P. J., Wright T. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Feasibility, design and sensitivity studies on innovative nuclear reactors that could address the issue of nuclear waste transmutation using fuels enriched in minor actinides, require high accuracy cross section data for a variety of neutron-induced reactions from thermal energies to several tens of MeV. The isotope 241Am (T1/2= 433 years) is present in high-level nuclear waste (HLW), representing about 1.8 % of the actinide mass in spent PWR UOx fuel. Its importance increases with cooling time due to additional production from the β-decay of 241Pu with a half-life of 14.3 years. The production rate of 241 Am in conventional reactors, including its further accumulation through the decay of 241Pu and its destruction through transmutation/incineration are very important parameters for the design of any recycling solution. In the present work, the 241 Am(n,f) reaction cross-section was measured using Micromegas detectors at the Experimental Area 2 of the n_TOF facility at CERN. For the measurement, the 235U(n,f) and 238U(n,f) reference reactions were used for the determination of the neutron flux. In the present work an overview of the experimental setup and the adopted data analysis techniques is given along with preliminary results.

Published
2020
Full Text
View/download PDF

33. Accurate measurement of the standard 235U(n,f) cross section from thermal to 170 keV neutron energy

Author

Amaducci S., Aberle O., Andrzejewski J., Audouin L., Bacak M., Balibrea J., Barbagallo M., Bečvář F., Berthoumieux E., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani M., Cano-Ott D, Cardella R., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G., Cortés-Girardo M. A., Cosentino L., Damone L. A., Diakaki M., Domingo-Pardo C, Dressler R., Dupont E., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Göbel K., García A. R., Gawlik A., Gilardoni S., Glodariu T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Harada H., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krtička M., Kurtulgil D., Leal-Cidoncha E, Lederer C., Leeb H., Lerendegui-Marco J, Lo Meo S., Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez 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., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sedyshev P., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A., Tassan-Got L, Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Warren S., Weiss C., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

An accurate measurement of the 235U(n,f) cross section from thermal to 170 keV of neutron energy has recently been performed at n_TOF facility at CERN using 6Li(n,t)4He and 10B(n,α)7Li as references. This measurement has been carried out in order to investigate a possible overestimation of the 235U fission cross section evaluation provided by most recent libraries between 10 and 30 keV. A custom experimental apparatus based on in-beam silicon detectors has been used, and a Monte Carlo simulation in GEANT4 has been employed to characterize the setup and calculate detectors efficiency. The results evidenced the presence of an overestimation in the interval between 9 and 18 keV and the new data may be used to decrease the uncertainty of 235U(n,f) cross section in the keV region.

Published
2020
Full Text
View/download PDF

34. Status and perspectives of the neutron time-of-flight facility n_TOF at CERN

Author

Chiaveri E., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V., Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Bosnar D., Brown A.S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Cano-Ott D., Casanovas A., Cerutti F., Colonna N., Cortés G.P., Cortés-Giraldo M.A., Cosentino L., Cristallo S., Damone L.A., Davies P.J., Diakaki M., Dietz M., Domingo-Pardo C., Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D.G., Jericha E., Jiri U., Junghans A., Kadi Y., Käppeler F., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C., Lerendegui-Marco J., Lonsdale S.-J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P.F., Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P.M., Millán-Callado M.A., Mingrone F., Moreno-Soto J., Musumarra A., Negret A., Ogállar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J.M., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A.G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeño-Saldivia A.E., Tassan-Got L., Thomas B., Torres-Sánchez P., Tsinganis A., 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.J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Since the start of its operation in 2001, based on an idea of Prof. Carlo Rubbia [1], the neutron time of-flight facility of CERN, n_TOF, has become one of the most forefront neutron facilities in the world for wide-energy spectrum neutron cross section measurements. Thanks to the combination of excellent neutron energy resolution and high instantaneous neutron flux available in the two experimental areas, the second of which has been constructed in 2014, n_TOF is providing a wealth of new data on neutron-induced reactions of interest for nuclear astrophysics, advanced nuclear technologies and medical applications. The unique features of the facility will continue to be exploited in the future, to perform challenging new measurements addressing the still open issues and long-standing quests in the field of neutron physics. In this document the main characteristics of the n_TOF facility and their relevance for neutron studies in the different areas of research will be outlined, addressing the possible future contribution of n_TOF in the fields of nuclear astrophysics, nuclear technologies and medical applications. In addition, the future perspectives of the facility will be described including the upgrade of the spallation target, the setup of an imaging installation and the construction of a new irradiation area.

Published
2020
Full Text
View/download PDF

35. Study of the neutron-induced fission cross section of 237Np at CERN's n_TOF facility over a wide energy range

Author

Stamatopoulos A., Tsinganis A., Diakaki M., Colonna N., Kokkoris M., Vlastou R., Kalamara A., Schillebeeckx P., Tassan-Got L, Žugec P., Sabaté-Gilarte M., Patronis N., Eleme Z., Heyse J., Aberle O., Andrzejewski J., Audouin L., Bacak M., Balibrea J., Barbagallo M., Bečvář F., Berthoumieux E., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani M., Cano-Ott D, Cardella R., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Domingo-Pardo C, Dressler R., Dupont E., Durán, Femandez-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Göbel K., García A. R., Gawlik A., Gilardoni S., Glodariu† T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Gunsing F., Harada H., Heinitz S., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Kavrigin P., Kimura A., Kivel N., Knapova I., Krtička M., Kurtulgil D., Leal-Cidoncha E, Lederer C., Leeb H., Lerendegui-Marco J, Meo S. Lo, Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez 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., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J. M., Radeck D., Rauscher T., Reifarth R., Rubbia C., Ryan J. A., Saxena A., Schumann D., Sedyshev P., Smith A. G., Sosnin N. V., Tagliente G., Tain J. L., Tarifeño-Saldivia A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Wallner A., Warren S., Weiss C., Woods P. J., and Wright T.

Subjects
Physics, QC1-999
Abstract

Neutron-induced fission cross sections of isotopes involved in the nuclear fuel cycle are vital for the design and safe operation of advanced nuclear systems. Such experimental data can also provide additional constraints for the adjustment of nuclear model parameters used in the evaluation process, resulting in the further development of fission models. In the present work, the 237Np(n,f) cross section was studied at the EAR2 vertical beam-line at CERN's n_TOF facility, over a wide range of neutron energies, from meV to MeV, using the time-of-flight technique and a set-up based on Micromegas detectors, in an attempt to provide accurate experimental data. Preliminary results in the 200 keV – 14 MeV neutron energy range as well as the experimental procedure, including a description of the facility and the data handling and analysis, will be presented.

Published
2020
Full Text
View/download PDF

36. The 154Gd neutron capture cross section measured at the n_TOF facility and its astrophysical implications

Author

Mastromarco M., Mazzone A., Massimi C., Cristallo S., Colonna N., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Cano-Ott D, Casanovas A., Cerutti F., Chiaveri E., Cortés G. P., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Davies P. J., Diakaki M., Dietz M., Domingo-Pardo C, Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Jiri U., Junghans A., Kadi Y., Käppeler F., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lonsdale S.-J., Macina D., Manna A., Martínez T., Masi A., Mastinu P. F., Maugeri E., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Millán-Callado M. A., Mingrone F., Moreno-Soto J, Musumarra A., Negret A., Ogállar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J. M., Doval D. Ramos, Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A. E., Tassan-Got L, Thomas B., Torres-Sánchez P., Tsinganis A., 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. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The (n, γ) cross sections of the gadolinium isotopes play an important role in the study of the stellar nucleosynthesis. In particular, among the isotopes heavier than Fe, 154Gd together with 152Gd have the peculiarity to be mainly produced by the slow capture process, the so-called s-process, since they are shielded against the β-decay chains from the r-process region by their stable samarium isobars. Such a quasi pure s-process origin makes them crucial for testing the robustness of stellar models in galactic chemical evolution (GCE). According to recent models, the 154Gd and 152Gd abundances are expected to be 15-20% lower than the reference un-branched s-process 150Sm isotope. The close correlation between stellar abundances and neutron capture cross sections prompted for an accurate measurement of 154Gd cross section in order to reduce the uncertainty attributable to nuclear physics input and eventually rule out one of the possible causes of present discrepancies between observation and model predictions. To this end, the neutron capture cross section of 154Gd was measured in a wide neutron energy range (from thermal up to some keV) with high resolution in the first experimental area of the neutron time-of-flight facility n_TOF (EAR1) at CERN. In this contribution, after a brief description of the motivation and of the experimental setup used in the measurement, the preliminary results of the 154Gd neutron capture reaction as well as their astrophysical implications are presented.

Published
2020
Full Text
View/download PDF

37. Preliminary results on the 233U α-ratio measurement at n_TOF

Author

Bacak M., Aïche M., Bélier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Krtička M., Laurent B., Leeb H., Mathieu L., Schillebeeckx P., Serot O., Taieb J., Valenta S., Vlachoudis V., Aberle O., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Bečvář F., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani, Cano-Ott D, Cardella R., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna, Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Domingo-Pardo C, Dressler R., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Göbel K., García A. R., Gawlik A., Gilardoni S., Glodariu T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Kurtulgil D., Leal-Cidoncha E, Lederer C., Lerendegui-Marco J, Meo S. Lo, Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez 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., Sabaté-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A., Tassan-Got L, Vannini G., Variale V., Vaz P., Ventura A., Vlastou R., Wallner A., Warren S., Weiss C., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

233U is the fissile nuclei in the Th-U fuel cycle with a particularily small neutron capture cross setion which is on average about one order of magnitude lower than its fission cross section. Hence, the measurement of the 233U(n, γ) cross section relies on a method to accurately distinguish between capture and fission γ-rays. A measurement of the 233U α-ratio has been performed at the n_TOF facility at CERN using a so-called fission tagging setup, coupling n_TOF 's Total Absorption Calorimeter with a novel fission chamber to tag the fission γ-rays. The experimental setup is described and essential parts of the analysis are discussed. Finally, a preliminary 233U α-ratio is presented.

Published
2020
Full Text
View/download PDF

38. Setup for the measurement of the 235U(n, f) cross section relative to n-p scattering up to 1 GeV

Author

Manna A., Aberle O., Alcayne V, Amaducci S., Andrzejewski J., Audouin L., Babiano V-Suarez, Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calvi Fño, Cano-Ott D, Casanovas A., Cerutti F., Chiaveri E., Colonna N., Cortés G. P., Cortés-Giraldo M. A., Coséntino L., Cristallo S., Damone L. A., Davies P. J., Diakaki M., Dietz M., Domingo-Pardo C, Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domíngez B., Ferrari A., Ferro-Goncalves I, Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F, Heinitz S., Heyse J., Jenkins D. G., Jericha E., Jiri U., Junghans A., Kadi Y, Käppeler F, Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtiička M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lonsdale S.-J., Macina D., Martínez T, Masi A., Massimi C., Mastinu P. F, Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V, Milazzo P. M., Millán-Callado M. A., Mingrone F, Moreno-Soto J, Musumarra A., Negret A., Nolte R., Ogállar F, Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J.M., Ramos D., Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A.G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeno-Saldivia A. E., Tassan-Got L, Thomas B., Torres-Sánchez P., Tsinganis A., 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 J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The neutron induced fission of 235U is extensively used as a reference for neutron fluence measurements in various applications, ranging from the investigation of the biological effectiveness of high energy neutrons, to the measurement of high energy neutron cross sections of relevance for accelerator driven nuclear systems. Despite its widespread use, no data exist on neutron induced fission of 235U above 200 MeV. The neutron facility n_TOF offers the possibility to improve the situation. The measurement of 235U(n,f) relative to the differential n-p scattering cross-section, was carried out in September 2018 with the aim of providing accurate and precise cross section data in the energy range from 10 MeV up to 1 GeV. In such measurements, Recoil Proton Telescopes (RPTs) are used to measure the neutron flux while the fission events are detected and counted with dedicated detectors. In this paper the measurement campaign and the experimental set-up are illustrated.

Published
2020
Full Text
View/download PDF

39. Neutron capture cross section measurements of 241Am at the n_TOF facility

Author

Oprea A., Gunsing F., Schillebeeckx P., Aberle O., Bacak M., Berthoumieux E., Cano-Ott D, Diakaki M., Dupont E., Geslot B., Glodariu T., Heyse J., Mendoza E., Negret A., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Bécares V., Babiano-Suarez V, Barbagallo M., Becčvář F., Bellia G., 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., Dietz M., Domingo-Pardo C, Dressler R., Durán I., Eleme Z., Femández-Domínguez B., Ferrari A., Finocchiaro P., Furman V., Göbel K., Garg R., Gawlik A., Gilardoni S., Goncalves I. F., González-Romero E., Guerrero C., Harada H., Heinitz S., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Kimura A., Kivel N., 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., Martínez T., 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., Nolte R., Ogállar F., Patronis N., Pavlik A., Perkowski J., Persanti L., Porras I., Praena J., Quesada J. M., Radeck D., Ramos-Doval D, Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schumann D., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Talip T., Tarifeño-Saldivia A., Tassan-Got L, Torres-Sánchez P., Tsinganis A., Ulrich J., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Neutron capture on 241Am plays an important role in the nuclear energy production and also provides valuable information for the improvement of nuclear models and the statistical interpretation of the nuclear properties. A new experiment to measure the 241Am(n, γ) cross section in the thermal region and the first few resonances below 10 eV has been carried out at EAR2 of the n_TOF facility at CERN. Three neutron-insensitive C6D6 detectors have been used to measure the neutron-capture gamma cascade as a function of the neutron time of flight, and then deduce the neutron capture yield. Preliminary results will be presented and compared with previously obtained results at the same facility in EAR1. In EAR1 the gamma-ray background at thermal energies was about 90% of the signal while in EAR2 is up to a 25 factor much more favorable signal to noise ratio. We also extended the low energy limit down to subthermal energies. This measurement will allow a comparison with neutron capture measurements conducted at reactors and using a different experimental technique.

Published
2020
Full Text
View/download PDF

40. New reaction rates for the destruction of 7Be during big bang nucleosynthesis measured at CERN/n_TOF and their implications on the cosmological lithium problem

Author

Mengoni A., Damone L.A., Barbagallo M., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Bennett S., Berthoumieux E., Bosnar D., Brown A.S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Cano-Ott D, Casanovas A., Cerutti F., Chiaveri E., Colonna N., Cortés G.P., Cortés-Giraldo M.A., Cosentino L., Cristallo S., Davies P.J., Diakaki M., Dietz M., Domingo-Pardo C, Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D.G., Jericha E., Jiri U., Junghans A., Kadi Y., Käppeler F., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lonsdale S.-J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P.F., Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Michalopoulou V., Milazzo P.M., Millán-Callado M.A., Mingrone F., Moreno-Soto J, Musumarra A., Negret A., Ogállar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J.M., Doval D. Ramos, Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A.G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeño-Saldivia A.E., Tassan-Got L, Thomas B., Torres-Sánchez P., Tsinganis A., 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.J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

New measurements of the 7Be(n,α)4He and 7Be(n,p)7Li reaction cross sections from thermal to keV neutron energies have been recently performed at CERN/n_TOF. Based on the new experimental results, astrophysical reaction rates have been derived for both reactions, including a proper evaluation of their uncertainties in the thermal energy range of interest for big bang nucleosynthesis studies. The new estimate of the 7Be destruction rate, based on these new results, yields a decrease of the predicted cosmological 7Li abundance insufficient to provide a viable solution to the cosmological lithium problem.

Published
2020
Full Text
View/download PDF

41. Laser-driven neutrons for time-of-flight experiments?

Author

Millán-Callado M.A., Guerrero C., Quesada J.M., Gómez J., Fernández B., Lerendegui-Marco J., Rodríguez-González T., Domingo-Pardo C., Tarifeño-Saldivia A., Benlliure J., Cortina D., Martín L., Peñas J., Cano-Ott D., and Martínez T.

Subjects
Physics, QC1-999
Abstract

Neutron beams, both pulsed and continuous, are a powerful tool in a wide variety of research fields and applications. Nowadays, pulsed neutron beams are produced in conventional accelerator facilities in which the time-of-fight technique is used to determine the kinetic energy of the neutrons inducing the reactions of interest. In the last decades, the development of ultra-short (femtosecond) and ultra-high power (> 1018 W/cm2) lasers has opened the door to a vast number of new applications, including the production and acceleration of pulsed ion beams. These have been recently used to produce pulsed neutron beams, reaching fluxes per pulse similar and even higher than those of conventional neutron beams, hence becoming an alternative for the pulsed neutron beam users community. Nevertheless, these laser-driven neutrons have not been exploited in nuclear physics experiments so far. Our main goal is to produce and characterize laser-driven neutrons but optimizing the analysis, diagnostic and detection techniques currently used in conventional neutron sources to implement them in this new environment. As a result, we would lay down the viability of carrying out nuclear physics experiments using this kind of sources by identifying the advantages and limitations of this production method. To achieve this purpose, we plan to perform experiments in both medium (50TW@L2A2, in Santiago de Com-postela) and high (1PW@APOLLON, in Paris) power laser facilities.

Published
2020
Full Text
View/download PDF

42. Measurement of the 244Cm capture cross sections at both CERN n_TOF experimental areas

Author

Alcayne V., Mendoza E., Cano-Ott D, Kimura A., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Barbagallo M., Bécares V., Bečvář F., Bellia G., Berthoumieux E., Billowes J., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G. P., 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-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Glodariu T., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Kadi Y., Käppeler F., Kivel N., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lo Meo S., Lonsdale S.-J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P. F., Mastromarco M., Matteucci F., Maugeri E., 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., Piersanti L., Porras I., Praena J., Quesada J. M., Radeck D., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Smith A. G., Sosnin N., Stamatopoulos A., Tagliente G., Tain J. L., Talip Z., Tarifeño-Saldivia A. E., Tassan-Got L, Torres-Sánchez P., Tsinganis A., Ulrich J., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

Accurate neutron capture cross section data for minor actinides (MAs) are required to estimate the production and transmutation rates of MAs in light water reactors with a high burnup, critical fast reactors like Gen-IV systems and other innovative reactor systems such as accelerator driven systems (ADS). Capture reactions of 244Cm open the path for the formation of heavier Cm isotopes and of heavier elements such as Bk and Cf. In addition, 244Cm shares nearly 50% of the total actinide decay heat in irradiated reactor fuels with a high burnup, even after three years of cooling. Experimental data for this isotope are very scarce due to the difficulties of providing isotopically enriched samples and because the high intrinsic activity of the samples requires the use of neutron facilities with high instantaneous flux. The only two previous experimental data sets for this neutron capture cross section have been obtained in 1969 using a nuclear explosion and, more recently, at J-PARC in 2010. The neutron capture cross sections have been measured at n_TOF with the same samples that the previous experiments in J-PARC. The samples were measured at n_TOF Experimental Area 2 (EAR-2) with three C6D6 detectors and also in Experimental Area 1 (EAR-1) with the Total Absorption Calorimeter (TAC). Preliminary results assessing the quality and limitations of these new experimental datasets are presented for the experiments in both areas. Preliminary yields of both measurements will be compared with evaluated libraries for the first time.

Published
2020
Full Text
View/download PDF

43. Measurement of the 242Pu(n, γ) cross section from thermal to 500 keV at the Budapest research reactor and CERN n_TOF-EAR1 facilities

Author

Lerendegui-Marco J, Guerrero C., Mendoza E., Quesada J. M., Eberhardt K., Junghans A., Krtiička M., Belgya T., Maróti B., Aberle O., Andrzejewski J., Audouin L., Bécares V., Bacak M., Balibrea J., Barbagallo M., Barros S., Bečvář F., Beinrucker C., Berthoumieux E., Billowes J., Bosnar D., Brugger M., Caamaño M., Calviño F., Calviani M., Cano-Ott D, Cardella R., Casanovas A., Castelluccio D. M., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Diakaki M., Domingo-Pardo C, Dressler R., Dupont E., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Göbel K., García A. R., Gawlik A., Glodariu T., Gonçalves I. F., González-Romero E., Goverdovski A., Griesmayer E., Gunsing F., Harada H., Heftrich T., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Katabuchi T., Kavrigin P., Ketlerov V., Khryachkov V., Kimura A., Kivel N., Knapova I., Kokkoris M., Leal-Cidoncha E, Lederer C., Leeb H., Lo Meo S., Lonsdale S. J., Losito R., Macina D., Marganiec J., Martínez T., Massimi C., Mastinu P., Mastromarco M., Matteucci F., Maugeri E. A., Mengoni A., Milazzo P. M., Mingrone F., Mirea M., Montesano S., Musumarra A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras J. I., Praena J., Rajeev K., Rauscher T., Reifarth R., Riego-Perez A, Rout P. C., Rubbia C., Ryan J. A., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Sedyshev P., Smith A. G., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A., Tassan-Got L, Tsinganis A., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Vlastou R., Wallner A., Warren S., Weigand M., Weiss C., Wolf C., Woods P. J., Wright T., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The design and operation of innovative nuclear systems requires a better knowledge of the capture and fission cross sections of the Pu isotopes. For the case of capture on 242Pu, a reduction of the uncertainty in the fast region down to 8-12% is required. Moreover, aiming at improving the evaluation of the fast energy range in terms of average parameters, the OECD NEA High Priority Request List (HPRL) requests high-resolution capture measurements with improved accuracy below 2 keV. The current uncertainties also affect the thermal point, where previous experiments deviate from each other by 20%. A fruitful collaboration betwen JGU Mainz and HZ Dresden-Rossendorf within the EC CHANDA project resulted in a 242Pu sample consisting of a stack of seven fission-like targets making a total of 95(4) mg of 242Pu electrodeposited on thin (11.5 μm) aluminum backings. This contribution presents the results of a set of measurements of the 242Pu(n, γ) cross section from thermal to 500 keV combining different neutron beams and techniques. The thermal point was determined at the Budapest Research Reactor by means of Neutron Activation Analysis and Prompt Gamma Analysis, and the resolved (1 eV - 4 keV) and unresolved (1 - 500 keV) resonance regions were measured using a set of four Total Energy detectors at the CERN n_TOF-EAR1.

Published
2020
Full Text
View/download PDF

44. Production yields of 𝛽+ emitters for range verification in proton therapy

Author

Rodríguez-González T., Guerrero C., Jiménez-Ramos M.C., Dendooven P., Lerendegui-Marco J., Fraile L.M., Millán-Callado M.A., Ozoemelam I., Parrado A., and Quesada J.M.

Subjects
Physics, QC1-999
Abstract

In-vivo Positron Emission Tomography (PET) range verification relies on the comparison of the measured and estimated activity distributions from β+ emitters induced by the proton beam on the most abundant elements in the human body, right after (looking at the long-lived β+ emitters 11C, 13N and 15O) or during (looking at the short-lived β+ emitters 29P, 12N, 38mK and 10C) the irradiation. The accuracy of the estimated activity distributions is basically that of the underlying cross section data. In this context, the aim of this work is to improve the knowledge of the production yields of β+ emitters of interest in proton therapy. In order to measure the long-lived β+ isotopes, a new method has been developed combining the multi-foil technique with the measurement of the induced activity with a clinical PET scanner. This technique has been tested successfully below 18 MeV at CNA (Spain) and will be used at a clinical beam to obtain data up to 230 MeV. However, such method does not allow measuring the production short-lived isotopes (lower half-life). For this, the proposed method combines a series of targets sandwiched between aluminum foils (acting as both degraders and converters) placed between two LaBr3 detectors that will measure the pairs of 511 keV γ-rays. The first tests will take place at the AGOR facility at KVI-CART, in Groningen.

Published
2020
Full Text
View/download PDF

45. Study of photon strength functions of 241Pu and 245Cm from neutron capture measurements

Author

Mendoza E., Alcayne V., Cano-Ott D, Kimura A., Skarbeli A. V., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Barbagallo M., Bécares V., Bečvář F., Bellia G., Berthoumieux E., Billowes J., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G. P., 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-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Glodariu T., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Kadi Y., Käppeler F., Kivel N., 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., Martínez T., Masi A., Massimi C., Mastinu P. F., Mastromarco M., Matteucci F., Maugeri E., 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., Piersanti L., Porras I., Praena J., Quesada J. M., Radeck D., Doval D. Ramos, Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Smith A. G., Sosnin N., Stamatopoulos A., Tagliente G., Tain J. L., Talip Z., Tarifeño-Saldivia A. E., Tassan-Got L, Torres-Sánchez P., Tsinganis A., Ulrich J., Urlass S., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Woods P. J., Wright T. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

We have measured the γ-rays following neutron capture on 240Pu and 244 Cm at the n_TOF facility at CERN with the Total Absorption Calorimeter (TAC) and with C6D6 organic scintillators. The TAC is made of 40 BaF2 crystals operating in coincidence and covering almost the entire solid angle. This allows to obtain information concerning the energy spectra and the multiplicity of the measured capture γ-ray cascades. Additional information is also obtained from the C6D6 detectors. We have analyzed the measured data in order to draw conclusions about the Photon Strength Functions (PSFs) of 241Pu and 245Cm below their neutron separation energies. The analysis has been performed by fitting the PSFs to the experimental results, using the differential evolution method, in order to find neutron capture cascades capable of reproducing at the same time a great variety of deposited energy spectra.

Published
2020
Full Text
View/download PDF

46. Monte Carlo simulations and n-p differential scattering data measured with Proton Recoil Telescopes

Author

Terranova N., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Barbagallo M., Bennett S., Berthoumieux E., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Cano-Ott D, Casanovas A., Cerutti F., Chiaveri E., Colonna N., Cortés G. P., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Damone L. A., Davies P. J., Diakaki M., Dietz M., Domingo-Pardo C, Dressler R., Ducasse Q., Dupont E., Durán I., Eleme Z., Fernández-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Heyse J., Jenkins D. G., Jericha E., Jiri U., Junghans A., Kadi Y., Käppeler F., Kimura A., Knapová I., Kokkoris M., Kopatch Y., Krtička M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lonsdale S.-J., Macina D., Manna A., Martínez T., Masi A., Massimi C., Mastinu P. F., Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Michalopoulou V., Milazzo P. M., Millán-Callado M. A., Mingrone F., Moreno-Soto J, Musumarra A., Negret A., Ogállar F., Oprea A., Patronis N., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J. M., Doval D. Ramos, Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Sekhar A., Smith A. G., Sosnin N., Sprung P., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A. E., Tassan-Got L, Thomas B., Torres-Sánchez P., Tsinganis A., 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. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The neutron-induced fission cross section of 235U, a standard at thermal energy and between 0.15 MeV and 200 MeV, plays a crucial role in nuclear technology applications. The long-standing need of improving cross section data above 20 MeV and the lack of experimental data above 200 MeV motivated a new experimental campaign at the n_TOF facility at CERN. The measurement has been performed in 2018 at the experimental area 1 (EAR1), located at 185 m from the neutron-producing target (the experiment is presented by A. Manna et al. in a contribution to this conference). The 235U(n,f) cross section from 20 MeV up to about 1 GeV has been measured relative to the 1H(n,n)1H reaction, which is considered the primary reference in this energy region. The neutron flux impinging on the 235U sample (a key quantity for determining the fission events) has been obtained by detecting recoil protons originating from n-p scattering in a C2H4 sample. Two Proton Recoil Telescopes (PRT), consisting of several layers of solid-state detectors and fast plastic scintillators, have been located at proton scattering angles of 25.07° and 20.32°, out of the neutron beam. The PRTs exploit the ΔE-E technique for particle identification, a basic requirement for the rejection of charged particles from neutron-induced reactions in carbon. Extensive Monte Carlo simulations were performed to characterize proton transport through the different slabs of silicon and scintillation detectors, to optimize the experimental set-up and to deduce the efficiency of the whole PRT detector. In this work we compare measured data collected with the PRTs with a full Monte Carlo simulation based on the Geant-4 toolkit.

Published
2020
Full Text
View/download PDF

47. First results of the 230Th(n,f) cross section measurements at the CERN n_TOF facility

Author

Michalopoulou V., Stamatopoulos A., Vlastou R., Kokkoris M., Tsinganis A., Diakaki M., Eleme Z., Patronis N., Heyse J., Schillebeeckx P., Tassan-Got L, Barbagallo M., Colonna N., Urlass S., Macina D., Chiaveri E., Aberle O., Alcayne V., Amaducci S., Andrzejewski J., Audouin L., Babiano-Suarez V, Bacak M., Bennett S., Berthoumieux E., Bosnar D., Brown A. S., Busso M., Caamaño M., Caballero L., Calviani M., Calviño F., Cano-Ott D, Casanovas A., Cerutti F., Cortés G. P., Cortés-Giraldo M. A., Cosentino L., Cristallo S., Damone L. A., Davies P. J., Dietz M., Domingo-Pardo C, Dressler R., Ducasse Q., Dupont E., Durán I., Femández-Domíngez B., Ferrari A., Ferro-Gonçalves I., Finocchiaro P., Furman V., Garg R., Gawlik A., Gilardoni S., Göbel K., González-Romero E., Guerrero C., Gunsing F., Heinitz S., Jenkins D. G., Jericha E., Jiri U., Junghans A., Kadi Y., Käppeler F., Kimura A., Knapová I., Kopatch Y., Krtiička M., Kurtulgil D., Ladarescu I., Lederer-Woods C, Lerendegui-Marco J, Lonsdale S.-J., Manna A., Martínez T., Masi A., Massimi C., Mastinu P. F., Mastromarco M., Maugeri E., Mazzone A., Mendoza E., Mengoni A., Milazzo P. M., Millán-Callado M. A., Mingrone F., Moreno-Soto J, Musumarra A., Negret A., Ogállar F., Oprea A., Pavlik A., Perkowski J., Petrone C., Piersanti L., Pirovano E., Porras I., Praena J., Quesada J. M., Ramos Doval D., Reifarth R., Rochman D., Rubbia C., Sabaté-Gilarte M., Saxena A., Schumann D., Sekhar A., Smith A. G., Sosnin N., Sprung P., Tagliente G., Tain J. L., Tarifeño-Saldivia A. E., Thomas B., Torres-Sánchez P., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vescovi D., Vlachoudis V., Wallner A., Woods P. J., Wright T. J., and Žugec P.

Subjects
Physics, QC1-999
Abstract

The study of neutron-induced reactions on actinides is of considerable importance for the design of advanced nuclear systems and alternative fuel cycles. Specifically, 230Th is produced from the α-decay of 234U as a byproduct of the 232Th/233U fuel cycle, thus the accurate knowledge of its fission cross section is strongly required. However, few experimental datasets exist in literature with large deviations among them, covering the energy range between 0.2 to 25 MeV. In addition, the study of the 230Th(n,f) cross-section is of great interest in the research on the fission process related to the structure of the fission barriers. Previous measurements have revealed a large resonance at En=715 keV and additional fine structures, but with high discrepancies among the cross-section values of these measurements. This contribution presents preliminary results of the 230Th(n,f) cross-section measurements at the CERN n_TOF facility. The high purity targets of the natural, but very rare isotope 230Th, were produced at JRC-Geel in Belgium. The measurements were performed at both experimental areas (EAR-1 and EAR-2) of the n_TOF facility, covering a very broad energy range from thermal up to at least 100 MeV. The experimental setup was based on Micromegas detectors with the 235U(n,f) and 238U(n,f) reaction cross-sections used as reference.

Published
2020
Full Text
View/download PDF

48. First measurement of the 94Nb(n,γ) cross section at the CERN n_TOF facility.

Author

Balibrea-Correa, J., Babiano-Suárez, V., Lerendegui-Marco, J., Domingo-Pardo, C., Ladarescu, I., Tarifeño-Saldivia, A., Alcayne, V., Cano-Ott, D., González-Romero, E., Martínez, T., Mendoza, E., Guerrero, C., Calviño, F., Casanovas, A., Köster, U., Chiera, N. M., Dressler, R., Maugeri, E. A., Schumann, D., and Aberle, O.

Subjects
NEUTRON capture, ISOTOPES, NUCLEAR astrophysics, NUCLEOSYNTHESIS, NUCLEAR reactions
Abstract

One of the crucial ingredients for the improvement of stellar models is the accurate knowledge of neutron capture cross-sections for the different isotopes involved in the s-,r- and i- processes. These measurements can shed light on existing discrepancies between observed and predicted isotopic abundances and help to constrain the physical conditions where these reactions take place along different stages of stellar evolution. In the particular case of the radioactive 94Nb, the 94Nb(n,γ) cross-section could play a role in the determination of the s-process production of 94Mo in AGB stars, which presently cannot be reproduced by state-of-the-art stellar models. There are no previous 94Nb(n,γ) experimental data for the resolved and unresolved resonance regions mainly due to the difficulties in producing highquality samples and also due to limitations in conventional detection systems commonly used in time-of-flight experiments. Motivated by this situation, a first measurement of the 94Nb(n,γ) reaction was carried out at CERN n_TOF, thereby exploiting the high luminosity of the EAR2 area in combination with a new detection system of small-volume C6D6-detectors and a high quality 94Nb-sample. The latter was based on hyper-pure 93Nb material activated at the high-flux reactor of ILL-Grenoble. An innovative ring-configuration detection system in close geometry around the capture sample allowed us to significantly enhance the signal-to-background ratio. This set-up was supplemented with two conventional C6D6-detectors and a highresolution LaCl3(Ce)-detector, which will be employed for addressing reliably systematic effects and uncertainties. At the current status of the data analysis, 18 resonance in 94Nb+n have been observed for the first time in the neutron energy range from thermal up to 10 keV. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

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

Author

Bacak M., Aiche M., Bélier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Laurent B., Leeb H., Mathieu L., Schillebeeckx P., Serot O., Taieb J., Vlachoudis V., Aberle O., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Bečvář F., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Domingo-Pardo C., Dressler R., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Göbel K., García A. R., Gawlik A., Gilardoni S., Glodariu T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krtička M., Kurtulgil D., Leal-Cidoncha E., Lederer C., Lerendegui-Marco J., Meo S. Lo, Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez 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., Sabaté-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-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 Žugec P.

Subjects
Physics, QC1-999
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 on an efficient capture-fission discrimination, thus a combined set-up of fission and γ-detectors is needed. A measurement of the 233U capture cross-section and capture-to-fission ratio was performed at the CERN n_TOF facility. The Total Absorption Calorimeter (TAC) of n_TOF was employed as γ-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.

Published
2019
Full Text
View/download PDF

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

Author

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
Physics, QC1-999
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 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 [1] and the most recent data measured at J-PARC in 2010 [2]. 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 C6 D6 detectors and also at Area 1 (EAR-1) with the TAC. Preliminary results assessing the quality and limitations (back-ground subtraction, measurement technique and counting statistics) of this new experimental datasets are presented and discussed.

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results