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51. Large Impact of the Decay of Niobium Isomers on the Reactor ${\overline{{\nu}}}_{e}$ Summation Calculations

Author: Guadilla, V., Algora, A., Tain, J.L., Estienne, Magali, Fallot, Muriel, Sonzogni, A.A., Agramunt, J., Äystö, J., Briz, J.A., Cucoanes, A., Eronen, T., Fraile, L.M., Ganioğlu, E., Gelletly, W., Gorelov, D., Hakala, J., Jokinen, A., Jordan, D., Kankainen, A., Kolhinen, V., Koponen, J., Lebois, M., Le Meur, L., Martinez, T., Monserrate, M., Montaner-Pizá, A., Moore, I., Nácher, E., Orrigo, S.E.A., Penttilä, H., Pohjalainen, I., Porta, Amanda, Reinikainen, J., Reponen, M., Rinta-Antila, S., Rubio, B., Rytkönen, K., Shiba, T., Sonnenschein, V., Valencia, E., Vedia, V., Voss, A., Wilson, J.N., Zakari-Issoufou, A.A., Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Penning trap, energy: ground state, particle separator, antineutrino: nuclear reactor, semileptonic decay, antineutrino: energy spectrum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, niobium, experimental results, energy: transition, Nuclear Physics
Abstract: International audience; Even mass neutron-rich niobium isotopes are among the principal contributors to the reactor antineutrino energy spectrum. They are also among the most challenging to measure due to the refractory nature of niobium, and because they exhibit isomeric states lying very close in energy. The β-intensity distributions of Nb100gs,100m and Nb102gs,102m β decays have been determined using the total absorption γ-ray spectroscopy technique. The measurements were performed at the upgraded Ion Guide Isotope Separator On-Line facility at the University of Jyväskylä. Here, the double Penning trap system JYFLTRAP was employed to disentangle the β decay of the isomeric states. The new data obtained in this challenging measurement have a large impact in antineutrino summation calculations. For the first time the discrepancy between the summation model and the reactor antineutrino measurements in the region of the shape distortion has been reduced.
Published: 2019
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52. Global and flexible models for Sodium-cooled Fast Reactors in fuel cycle simulations

Author: Adrien Bidaud, Sandra Bouneau, Fanny Courtin, M. Ernoult, Abdoul-Aziz Zakari-Issoufou, Sylvain David, A. Somaini, N. Thiollière, X. Doligez, Jean-Baptiste Clavel, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes - Faculté des Sciences et des Techniques, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)
Subjects: Artificial neural network, Computer science, 020209 energy, Nuclear engineering, Process (computing), 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Spent nuclear fuel, 010305 fluids & plasmas, Sodium-cooled fast reactor, Breeder (animal), Nuclear Energy and Engineering, Range (aeronautics), 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Sensitivity (control systems), Scenario testing
Abstract: International audience; Since Sodium cooled Fast Reactors are present in many scenarios and strategies for the future of nuclear energy while not having a specific design established yet, we created a new fast and flexible model for the dynamic fuel cycle simulation tools CLASS. It includes a depletion meta-model and a fuel loading method based on artificial neural networks. It is able to represent a wide range of Sodium cooled Fast Reactor designs using oxide fuels and a wide range of fuel management strategies within fuel cycle simulation tools. A comprehensive analysis of simplification options has been made in order to choose the right level of complexity for the reference full core depletion calculations performed with the MURE code used for the training of the meta-model. The process from these reference calculations to the final meta-model is explained and a specific focus is given to the operations going from detailed full core depletion results to global results suitable for neural networks training. Details on the creation process for neural networks based predictors, one for each average cross-section, and their training on full core depletion calculations are given as well as the implementation within the CLASS code. The irradiation meta-model achieves good precision on all major and minor actinides present in spent fuel. The designs and loaded fuel covered by the model allow significant burner to strong breeder strategies. A sensitivity analysis shows that the number of fertile blankets is the primary contributor for breeding capabilities, but effects of isotopic composition are also significant. A test scenario illustrates the model capacity to simulate burner and breeder designs.
Published: 2019
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53. Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 137I and 95Rb

Author: Guadilla, V., Tain, J. L., Algora, A., Agramunt, J., Jordan, D., Monserrate, M., Montaner-Pizá, A., Nácher, E., Orrigo, S. E. A., Rubio, B., Valencia, E., Estienne, M., Fallot, M., Le Meur, L., Briz, J. A., Cucoanes, A., Porta, A., Shiba, T., Zakari-Issoufou, A.-A., Äystö, J., Eronen, T., Gorelov, D., Hakala, J., Jokinen, A., Kankainen, A., Kolhinen, V. S., Koponen, J., Moore, I. D., Penttilä, H., Pohjalainen, I., Reinikainen, J., Reponen, M., Rinta-Antila, S., Rytkönen, K., Sonnenschein, V., Voss, A., Fraile, L. M., Vedia, V., Ganioglu, E., Gelletly, W., Lebois, M., Wilson, J. N., and Martinez, T.
Subjects: Astrophysics::High Energy Astrophysical Phenomena, astrofysiikka, nuclear astrophysics, beta decay, Nuclear Experiment, ydinfysiikka, nuclear structure&decays
Abstract: The decays of the β-delayed neutron emitters 137I and 95Rb have been studied with the total absorption γ-ray spectroscopy technique. The purity of the beams provided by the JYFLTRAP Penning trap at the ion guide isotope separator on-line facility in Jyväskylä allowed us to carry out a campaign of isotopically pure measurements with the decay total absorption γ-ray spectrometer, a segmented detector composed of 18 NaI(Tl) modules. The contamination coming from the interaction of neutrons with the spectrometer has been carefully studied, and we have tested the use of time differences between prompt γ rays and delayed neutron interactions to eliminate this source of contamination. Due to the sensitivity of our spectrometer, we have found a significant amount of β intensity to states above the neutron separation energy that deexcite by γ rays, comparable to the neutron emission probability. The competition between γ deexcitation and neutron emission has been compared with Hauser-Feshbach calculations, and it can be understood as a nuclear structure effect. In addition, we have studied the impact of the β-intensity distributions determined in this work on reactor decay heat and reactor antineutrino spectrum summation calculations. The robustness of our results is demonstrated by a thorough study of uncertainties and with the reproduction of the spectra of the individual modules and the module-multiplicity gated spectra. This work represents the state-of-the-art of our analysis methodology for segmented total absorption spectrometers. peerReviewed
Published: 2019

54. Gamma/neutron competition above the neutron separation energy in delayed neutron emitters

Author: Valencia E., Algora A., Tain J. L., Rice S., Agramunt J., Zakari-Issoufou A. -A., Äystö J., Bowry M., Bui V. M., Caballero-Folch R., Cano-Ott D., Eloma V., Eronen T., Estevez E., Farrelly G.F., Fallot M., Garcia A., Gelletly W., Gomez-Hornillos M.B., Gorlychev V., Hakala J., Jokinen A., Jordan M. D., Kankainen A., Kondev F. G., Martinez T., Mendoza E., Molina F., Moore I., Perez A., Podolyak Zs., Penttilä H., Porta A., Regan P. H., Rissanen J., Rubio B., and Weber C.
Subjects: Physics, QC1-999
Abstract: To study the β-decay properties of some well known delayed neutron emitters an experiment was performed in 2009 at the IGISOL facility (University of Jyväskylä in Finland) using Total Absorption γ-ray Spectroscopy (TAGS) technique. The aim of these measurements is to obtain the full β-strength distribution below the neutron separation energy (Sn) and the γ/neutron competition above. This information is a key parameter in nuclear technology applications as well as in nuclear astrophysics and nuclear structure. Preliminary results of the analysis show a significant γ-branching ratio above Sn.
Published: 2014
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55. Assessment of plutonium inventory management in the french nuclear fleet with the fuel cycle simulator CLASS

Author: X. Doligez, Nicolas Thiollière, B. Mouginot, A.-A. Zakari-Issoufou, Baptiste Leniau, Marc Ernoult, Fanny Courtin, Jiali Liang, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Fuel cycle, 020209 energy, Nuclear engineering, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, Safety, Risk, Reliability and Quality, Waste Management and Disposal, MOX fuel, business.industry, Mechanical Engineering, Actinide, Nuclear power, Incineration, Plutonium, Technical feasibility, Nuclear Energy and Engineering, chemistry, Alternative energy, Environmental science, business
Abstract: International audience; The ASTRID French project aimed at designing, building and operating a sodium fast reactor cooled with liquid sodium. One of the goals of the project was to demonstrate the feasibility of the plutonium multi-recycling in a fast spectrum. Commissariat à l’énergie atomique et aux énergies alternatives (CEA - Atomic & Alternative Energies Commission) has recently announced the abandon of the project which involves that no sodium fast reactor project is planned in France. As a consequence, there is a real interest in assessing technical feasibility for alternative plutonium management. In this work, the plutonium multi-recycling in PWR is assessed from fuel cycle simulations performed with the library CLASS developed by CNRS/IN2P3. The technical conditions for plutonium incineration and stabilization are investigated. It is shown that plutonium can be stabilized with 30% of PWR using multi-reprocessed plutonium in MOX fuel, the rest being composed by PWR loaded with UOX. The transuranic (plutonium and minor actinides) stabilization involves a plutonium incineration. For this reason, around 50% of PWR using multi-reprocessed plutonium is required and the nuclear power has to decrease. In this paper, the methodology and the output analysis are described in detail.
Published: 2021
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56. Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes

Author: Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Estienne, M., Fallot, M., Algora, Alejandro, Briz, José Antonio, Bui, V.M., Cormon, S., Gelletly, W., Giot, L., Guadilla, V., Jordan, D., Le Meur, L., Porta, A., Rice, S., Rubio, Berta, Tain, José Luis, Valencia, E., Zakari-Issoufou, A.A., Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Estienne, M., Fallot, M., Algora, Alejandro, Briz, José Antonio, Bui, V.M., Cormon, S., Gelletly, W., Giot, L., Guadilla, V., Jordan, D., Le Meur, L., Porta, A., Rice, S., Rubio, Berta, Tain, José Luis, Valencia, E., and Zakari-Issoufou, A.A.
Abstract: A new summation method model of the reactor antineutrino energy spectrum is presented. It is updated with the most recent evaluated decay databases and with our total absorption gamma-ray spectroscopy measurements performed during the last decade. For the first time, the spectral measurements from the Daya Bay experiment are compared with the antineutrino energy spectrum computed with the updated summation method without any renormalization. The results exhibit a better agreement than is obtained with the Huber-Mueller model in the 2-5 MeV range, the region that dominates the detected flux. A systematic trend is found in which the antineutrino flux computed with the summation model decreases with the inclusion of more pandemonium-free data. The calculated flux obtained now lies only 1.9% above that detected in the Daya Bay experiment, a value that may be reduced with forthcoming new pandemonium-free data, leaving less room for a reactor anomaly. Eventually, the new predictions of individual antineutrino spectra for the U235, Pu239, Pu241, and U238 are used to compute the dependence of the reactor antineutrino spectral shape on the fission fractions.
Published: 2019

57. Contribution of recently measured nuclear data to reactor antineutrino energy spectra predictions

Author: Fallot M., Cormon S., Estienne M., Algora A., Bui V.M., Cucoanes A., Elnimr M., Giot L., Jordan D., Martino J., Onillon A., Porta A., Pronost G., Remoto A., Taín J.L., Yermia F., and Zakari-Issoufou A.-A.
Subjects: Physics, QC1-999
Abstract: This paper attempts to summarize the actual problematic of reactor antineutrino energy spectra in the frame of fundamental and applied neutrino physics. Nuclear physics is an important ingredient of reactor antineutrino experiments. These experiments are motivated by neutrino oscillations, i.e. the measure of the θ13 mixing angle. In 2011, after a new computation of the reactor antineutrino energy spectra, based on the conversion of integral data of the beta spectra from 235U, and 239;241Pu, a deficit of reactor antineutrinos measured by short baseline experiments was pointed out. This is called the “reactor anomaly”, a new puzzle in the neutrino physics area. Since then, numerous new experimental neutrino projects have emerged. In parallel, computations of the antineutrino spectra independant from the ILL data would be desirable. One possibility is the use of the summation method, summing all the contributions of the fission product beta decay branches that can be found in nuclear databases. Studies have shown that in order to obtain reliable summation antineutrino energy spectra, new nuclear physics measurements of selected fission product beta decay properties are required. In these proceedings, we will present the computation methods of reactor antineutrino energy spectra and the impact of recent beta decay measurements on summation method spectra. The link of these nuclear physics studies with short baseline line oscillation search will be drawn and new neutrino physics projects at research reactors will be briefly presented.
Published: 2013
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58. Impact of the Most Recent Total Absorption Gamma-ray Spectroscopy Data for Fission Fragments on Reactor Antineutrino Spectra and Comparison with the Daya Bay Results

Author: Muriel Fallot, S. Cormon, W. Gelletly, A.-A. Zakari-Issoufou, Lydie Giot, J. Briz-Monago, D. Jordan, B. Rubio, V. Guadilla, V. M. Bui, M. Estienne, E. Valencia, Amanda Porta, L. Le Meur, A. Algora, Stephen Rice, J. L. Tain, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)
Subjects: Physics, History, 010308 nuclear & particles physics, Fission, Daya bay, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Computer Science Applications, Education, 0103 physical sciences, Gamma spectroscopy, Nuclear Experiment, 010306 general physics, Absorption (electromagnetic radiation)
Abstract: The accurate determination of reactor antineutrino spectra is still a challenge. In 2017 the Daya Bay experiment has measured the evolution of the antineutrino flux with the fuel content of the reactor core. The observed deficit of the detected flux compared with the predictions of the conversion model was almost totally explained by the data arising from the fissions of 235U while the part dominated by the fission of 239Pu was in good agreement with the conversion model. The TAGS collaboration has carried out two experimental campaigns during the last decade at the JYFLTRAP of Jyväskylä (Finland) measuring a large set of data in order to improve the quality of the predictions of our summation method. These measurements allow the correction of the nuclear data for the Pandemonium effect, thus making an important contribution to calculating the antineutrino spectra. The impact of these ten years of measurement from our collaboration on the predicted antineutrino energy spectrum and flux are shown using our summation calculations. The results are compared with the Daya Bay measurements showing the best agreement in shape (in the antineutrino energy range 2 to 5 MeV) and in flux obtained so far with a model. The flux deficit observed by Daya Bay with respect to the summation method is now reduced to 1.9% leaving little room for the reactor anomaly. The shape anomaly between 5 and 7 MeV in antineutrino energy is still observed and remains unexplained.
Published: 2020
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59. Large Impact of the Decay of Niobium Isomers on the Reactor ν[over ¯]_{e} Summation Calculations

Author: V, Guadilla, A, Algora, J L, Tain, M, Estienne, M, Fallot, A A, Sonzogni, J, Agramunt, J, Äystö, J A, Briz, A, Cucoanes, T, Eronen, L M, Fraile, E, Ganioğlu, W, Gelletly, D, Gorelov, J, Hakala, A, Jokinen, D, Jordan, A, Kankainen, V, Kolhinen, J, Koponen, M, Lebois, L, Le Meur, T, Martinez, M, Monserrate, A, Montaner-Pizá, I, Moore, E, Nácher, S E A, Orrigo, H, Penttilä, I, Pohjalainen, A, Porta, J, Reinikainen, M, Reponen, S, Rinta-Antila, B, Rubio, K, Rytkönen, T, Shiba, V, Sonnenschein, E, Valencia, V, Vedia, A, Voss, J N, Wilson, and A-A, Zakari-Issoufou
Abstract: Even mass neutron-rich niobium isotopes are among the principal contributors to the reactor antineutrino energy spectrum. They are also among the most challenging to measure due to the refractory nature of niobium, and because they exhibit isomeric states lying very close in energy. The β-intensity distributions of ^{100gs,100m}Nb and ^{102gs,102m}Nb β decays have been determined using the total absorption γ-ray spectroscopy technique. The measurements were performed at the upgraded Ion Guide Isotope Separator On-Line facility at the University of Jyväskylä. Here, the double Penning trap system JYFLTRAP was employed to disentangle the β decay of the isomeric states. The new data obtained in this challenging measurement have a large impact in antineutrino summation calculations. For the first time the discrepancy between the summation model and the reactor antineutrino measurements in the region of the shape distortion has been reduced.
Published: 2018

60. Summation Calculations for Reactor Antineutrino Spectra, Decay Heat and Delayed Neutron Fractions Involving New TAGS Data and Evaluated Databases

Author: T. Shiba, M. Monserrate, L. Giot, M. Fallot, W. Gelletly, Juha Äystö, A. Cucoanes, Iain Moore, L. M. Fraile, M. Reponen, Jani Hakala, Anu Kankainen, S. E. A. Orrigo, José Antonio Briz, Veli Kolhinen, V. Vedia, Sami Rinta-Antila, C. Weber, Jukka Koponen, Enrique Nácher, Dmitry Gorelov, T. Martinez, Jorge Agramunt, M. Estienne, Annika Voss, J. L. Tain, E. Valencia, E. Ganogliu, J. N. Wilson, M. Lebois, A. Porta, V. Guadilla-Gomez, Tommi Eronen, K. Rytkönen, Ari Jokinen, L. Le Meur, A. Algora, Ilkka Pohjalainen, S. Cormon, A. Montaner-Pizá, Berta Rubio, M. D. Jordan, Heikki Penttilä, Volker Sonnenschein, A.-A. Zakari-Issoufou, Alejandro Sonzogni, Juuso Reinikainen, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Serot, O., Chebboubi, A., Helsinki Institute of Physics, Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and SCOAP
Subjects: Nuclear fission product, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Fission, QC1-999, Nuclear Theory, 114 Physical sciences, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, SPECTROMETER, Gamma spectroscopy, Decay heat, 010306 general physics, Nuclear Experiment, Physics, [PHYS]Physics [physics], Fission products, 010308 nuclear & particles physics, Nuclear data, Física nuclear, High Energy Physics::Experiment, Delayed neutron, Radioactive decay
Abstract: 9 pags., 3 figs. -- Open Access funded by Creative Commons Atribution Licence 4.0, Three observables of interest for present and future reactors depend on the β decay properties of the fission products: antineutrinos from reactors, the reactor decay heat and delayed neutron emission. In these proceedings, we present new results from summation calculations of the first two quantities quoted above, performed with evolved independent yields coupled with fission product decay data, from various nuclear data bases or models. New TAGS results from the latest experiment of the TAGS collaboration at the JYFL facility of Jyväskylä will be displayed as well as their impact on the antineutrino spectra and the decay heat associated to fission pulses of the main actinides.
Published: 2018
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61. Characterization and performance of the DTAS detector

Author: J. N. Wilson, M. Monserrate, K. Rytkönen, Ilkka Pohjalainen, D. Jordan, Stephen Rice, V. Guadilla, Annika Voss, A.-A. Zakari-Issoufou, M. Lebois, Juha Äystö, Mikael Reponen, Muriel Fallot, S.E.A. Orrigo, E. Ganioglu, Tommi Eronen, Ari Jokinen, A. A. Sonzogni, Jukka Koponen, L. Le Meur, Juuso Reinikainen, M. Estienne, Enrique Nácher, Heikki Penttilä, Volker Sonnenschein, L. M. Fraile, Jani Hakala, E. Valencia, A. Cucoanes, Iain Moore, Anu Kankainen, Veli Kolhinen, Dmitry Gorelov, A. Montaner-Pizá, Berta Rubio, W. Gelletly, J. A. Briz, T. Martinez, T. Shiba, Jorge Agramunt, Alejandro Algora, J. L. Tain, Amanda Porta, V. Vedia, Sami Rinta-Antila, European Commission, Science and Technology Facilities Council (UK), Istanbul University, Ministerio de Economía y Competitividad (España), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Nantes - Faculté des Sciences et des Techniques, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, spektrometrit, β decay, FOS: Physical sciences, Non-proportional scintillation light yield: Monte Carlo simulations, Monte Carlo simulations [Non-proportional scintillation light yield], y-ray spectrometer, B decay, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Monte Carlo simulations, Optics, Distortion, 0103 physical sciences, Neutron, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Absorption (electromagnetic radiation), Nuclear Experiment, Instrumentation, [formula omitted] decay, Physics, ta114, Spectrometer, 010308 nuclear & particles physics, business.industry, NaI(Tl) detector, Pulse generator, Total absorption [formula omitted]-ray spectrometer, Detector, non-proportional scintillation light yield, Instrumentation and Detectors (physics.ins-det), Total absorption γ -ray spectrometer, Non-proportional scintillation light yield, Física nuclear, Total absorption, ydinfysiikka, business, Delayed neutron, Exotic nuclei
Abstract: 11 pags., 16 figs., 3 tabs., DTAS is a segmented total absorption γ-ray spectrometer developed for the DESPEC experiment at FAIR. It is composed of up to eighteen NaI(Tl) crystals. In this work we study the performance of this detector with laboratory sources and also under real experimental conditions. We present a procedure to reconstruct offline the sum of the energy deposited in all the crystals of the spectrometer, which is complicated by the effect of NaI(Tl) light-yield non-proportionality. The use of a system to correct for time variations of the gain in individual detector modules, based on a light pulse generator, is demonstrated. We describe also an event-based method to evaluate the summing-pileup electronic distortion in segmented spectrometers. All of this allows a careful characterization of the detector with Monte Carlo simulations that is needed to calculate the response function for the analysis of total absorption γ-ray spectroscopy data. Special attention was paid to the interaction of neutrons with the spectrometer, since they are a source of contamination in studies of β-delayed neutron emitting nuclei., This work has been supported by the Spanish Ministerio de Economia y Competitividad under grants FPA2011-24553, AIC-A-2011-0696, FPA2014-52823-C2-1-P and the program Severo Ochoa (SEV-2014-0398), by the European Commission under the FP7/EURATOM contract 605203, and by the Spanish Ministerio de Educacion Cultura y Deporte under the FPU12/01527 grant. The work was also supported by the UK Science and Technology Facilities Council (STFC) grant 14 ST/P005314/1. E. Ganioglu was supported by the Istanbul University Scientic Research Project Unit under FYO-2017-24144 project.
Published: 2018
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62. A methodology for performing sensitivity analysis in dynamic fuel cycle simulation studies applied to a PWR fleet simulated with the CLASS tool

Author: Adrien Bidaud, Sylvain David, Carole Perigois, Yann Richet, B. Mouginot, Victor Lebrin, Marc Ernoult, Baptiste Leniau, Alice Somaini, Zakari Issoufou, X. Doligez, Fanny Courtin, N. Thiollière, Guillaume Krivtchik, Jean-Baptiste Clavel, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: business.industry, 020209 energy, Scale (chemistry), Design of experiments, Stockpile, chemistry.chemical_element, Minor actinide, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, lcsh:TK9001-9401, 010305 fluids & plasmas, Plutonium, Variable (computer science), chemistry, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, lcsh:Nuclear engineering. Atomic power, Sensitivity (control systems), Process engineering, business, MOX fuel
Abstract: International audience; Fuel cycle simulators are used worldwide to provide scientific assessment to fuel cycle future strategies. Those tools help understanding the fuel cycle physics and determining the most impacting drivers at the cycle scale. A standard scenario calculation is usually based on a set of operational assumptions, such as reactor Burn-Up, deployment history, cooling time, etc. Scenario output is then the evolution of isotopes mass in the facilities that composes the nuclear fleet. The increase of computing capacities and the use of neutron data fast predictors provide new opportunities in nuclear scenario studies. Indeed, a very high number of calculations is possible, which allows testing a high number of operational assumptions combinations. The global sensitivity analysis (GSA) formalism is specifically well adapted for this kind of problem. In this new framework, a scenario study is based on the sampling of operational data, which become input variables. A first result of a scenario study is the highlight of relations between operational input data and outputs. Input variable subspace that satisfy optimization criteria on an output, such as plutonium incineration or stabilization, can also be determined. In this paper, a focus is made on the methodology based on GSA. This innovative methodology is presented and applied to a simple fleet simulation composed of a PWR-UOx fuel and a PWR-MOx fuel. Calculations are done with the fuel cycle simulator CLASS developed by the CNRS/IN2P3 in collaboration with IRSN. The design of experiment is built from five fuel cycle input sampled variables. Sensitivity indices have been calculated on plutonium and minor actinide (MA) production. It shows that the PWR-UOx Burn-Up and the fraction of PWR-MOx fuel are the most important input variables that explain the plutonium production. For the MA production, main drivers depend strongly on isotopes. Sensitivity analysis also reveals input variable subspace responsible of simulation crash, what led to an important improvement of the model algorithms. An equilibrium condition on the plutonium mass in the stockpile used for building MOx fuel has been applied. The solution is represented as a subspace in the PWR-UOx Burn-Up and PWR-MOx fraction input space. For instance, achieving a plutonium equilibrium in a stockpile fed by a PWR-UOx that operates at 40 GWd/t requires a PWR-MOx fraction between 9 and 14%. This study also provides data related to plutonium incineration induced by the utilization of the MOx.
Published: 2018
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63. Total absorption γ -ray spectroscopy of the β -delayed neutron emitters I137 and Rb95

Author: Guadilla, V., primary, Tain, J. L., additional, Algora, A., additional, Agramunt, J., additional, Jordan, D., additional, Monserrate, M., additional, Montaner-Pizá, A., additional, Nácher, E., additional, Orrigo, S. E. A., additional, Rubio, B., additional, Valencia, E., additional, Estienne, M., additional, Fallot, M., additional, Le Meur, L., additional, Briz, J. A., additional, Cucoanes, A., additional, Porta, A., additional, Shiba, T., additional, Zakari-Issoufou, A.-A., additional, Sonzogni, A. A., additional, Äystö, J., additional, Eronen, T., additional, Gorelov, D., additional, Hakala, J., additional, Jokinen, A., additional, Kankainen, A., additional, Kolhinen, V. S., additional, Koponen, J., additional, Moore, I. D., additional, Penttilä, H., additional, Pohjalainen, I., additional, Reinikainen, J., additional, Reponen, M., additional, Rinta-Antila, S., additional, Rytkönen, K., additional, Sonnenschein, V., additional, Voss, A., additional, Fraile, L. M., additional, Vedia, V., additional, Ganioğlu, E., additional, Gelletly, W., additional, Lebois, M., additional, Wilson, J. N., additional, and Martinez, T., additional
Published: 2019
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64. Total absorption γ -ray spectroscopy of niobium isomers

Author: Guadilla, V., primary, Algora, A., additional, Tain, J. L., additional, Agramunt, J., additional, Äystö, J., additional, Briz, J. A., additional, Cucoanes, A., additional, Eronen, T., additional, Estienne, M., additional, Fallot, M., additional, Fraile, L. M., additional, Ganioğlu, E., additional, Gelletly, W., additional, Gorelov, D., additional, Hakala, J., additional, Jokinen, A., additional, Jordan, D., additional, Kankainen, A., additional, Kolhinen, V., additional, Koponen, J., additional, Lebois, M., additional, Le Meur, L., additional, Martinez, T., additional, Monserrate, M., additional, Montaner-Pizá, A., additional, Moore, I., additional, Nácher, E., additional, Orrigo, S. E. A., additional, Penttilä, H., additional, Pohjalainen, I., additional, Porta, A., additional, Reinikainen, J., additional, Reponen, M., additional, Rinta-Antila, S., additional, Rubio, B., additional, Rytkönen, K., additional, Sarriguren, P., additional, Shiba, T., additional, Sonnenschein, V., additional, Sonzogni, A. A., additional, Valencia, E., additional, Vedia, V., additional, Voss, A., additional, Wilson, J. N., additional, and Zakari-Issoufou, A.-A., additional
Published: 2019
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65. Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes

Author: Estienne, M., primary, Fallot, M., additional, Algora, A., additional, Briz-Monago, J., additional, Bui, V. M., additional, Cormon, S., additional, Gelletly, W., additional, Giot, L., additional, Guadilla, V., additional, Jordan, D., additional, Le Meur, L., additional, Porta, A., additional, Rice, S., additional, Rubio, B., additional, Taín, J. L., additional, Valencia, E., additional, and Zakari-Issoufou, A.-A., additional
Published: 2019
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66. Large Impact of the Decay of Niobium Isomers on the Reactor ν¯e Summation Calculations

Author: Guadilla, V., primary, Algora, A., additional, Tain, J. L., additional, Estienne, M., additional, Fallot, M., additional, Sonzogni, A. A., additional, Agramunt, J., additional, Äystö, J., additional, Briz, J. A., additional, Cucoanes, A., additional, Eronen, T., additional, Fraile, L. M., additional, Ganioğlu, E., additional, Gelletly, W., additional, Gorelov, D., additional, Hakala, J., additional, Jokinen, A., additional, Jordan, D., additional, Kankainen, A., additional, Kolhinen, V., additional, Koponen, J., additional, Lebois, M., additional, Le Meur, L., additional, Martinez, T., additional, Monserrate, M., additional, Montaner-Pizá, A., additional, Moore, I., additional, Nácher, E., additional, Orrigo, S. E. A., additional, Penttilä, H., additional, Pohjalainen, I., additional, Porta, A., additional, Reinikainen, J., additional, Reponen, M., additional, Rinta-Antila, S., additional, Rubio, B., additional, Rytkönen, K., additional, Shiba, T., additional, Sonnenschein, V., additional, Valencia, E., additional, Vedia, V., additional, Voss, A., additional, Wilson, J. N., additional, and Zakari-Issoufou, A.-A., additional
Published: 2019
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67. Total absorption spectroscopy study of the beta decay of Br-86 and Rb-91

Author: Rice, S., Algora, A., Tain, J. L., Valencia, E., Agramunt, J., Rubio, B., Gelletly, W., Regan, P. H., Zakari-Issoufou, A. -A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ou, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martinez, T., Mason, P., Mendoza, E., Moore, I., Penttilä, H., Podolyak, Zs., Reponen, M., Sonnenschein, V., Sonzogni, A. A., Sarriguren, P., and Helsinki Institute of Physics
Subjects: PURIFICATION, SIMULATION, FISSION-PRODUCTS, JYFLTRAP, SPECTRA, DISTRIBUTIONS, High Energy Physics::Experiment, IGISOL, PENNING TRAP, Nuclear Experiment, GAMMA-RAY SPECTROMETER, NUCLEAR-LEVEL DENSITIES, 114 Physical sciences
Abstract: The beta decays of Br-86 and Rb-91 have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the Ion Guide Isotope Separator On-Line facility in Jyvaskyla and further purified using the JYFLTRAP. Br-86 and Rb-91 are considered to be major contributors to the decay heat in reactors. In addition, Rb-91 was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decaywas well known from high-resolution measurements. Our results show that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated.
Published: 2017

68. Experimental study of Tc100 β decay with total absorption γ -ray spectroscopy

Author: V. Vedia, Osvaldo Civitarese, Sami Rinta-Antila, E. Ganioglu, A.-A. Zakari-Issoufou, A. Cucoanes, Jukka Koponen, Enrique Nácher, A. Montaner-Pizá, José Antonio Briz, Ari Jokinen, W. Gelletly, Jouni Suhonen, Heikki Penttilä, J. N. Wilson, A. Algora, Ilkka Pohjalainen, Juha Äystö, M. Estienne, Mikael Reponen, D. Jordan, B. Rubio, L. M. Fraile, Muriel Fallot, K. Rytkönen, Jorge Agramunt, V. Guadilla, M. Lebois, Tommi Eronen, M. Monserrate, Volker Sonnenschein, A. A. Sonzogni, T. Martinez, J. L. Tain, Jani Hakala, Annika Voss, T. Shiba, E. Valencia, Juuso Reinikainen, Iain Moore, Anu Kankainen, S. E. A. Orrigo, Veli Kolhinen, Dmitry Gorelov, and Amanda Porta
Subjects: Physics, 010308 nuclear & particles physics, Branching fraction, Gamma ray, 01 natural sciences, Beta decay, Double beta decay, 0103 physical sciences, Gamma spectroscopy, Atomic physics, 010306 general physics, Ground state, Spectroscopy, Absorption (electromagnetic radiation)
Abstract: The beta decay of Tc-100 has been studied by using the total absorption gamma-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyvaskyla. In this work the new Decay Total Absorption gamma-ray Spectrometer in coincidence with a cylindrical plastic beta detector has been employed. The beta intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double beta decay of Mo-100.
Published: 2017
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69. Total Absorption Spectroscopy Study of the Beta Decay of 86Br and 91 1 Rb

Author: Rice, S, Algora, A, Tain, JL, Valencia, E, Agramunt, J, Rubio, B, Gelletly, William, Regan, Patrick, Zakari-Issoufou, A-A, Fallot, M, Porta, A, Rissanen, J, Eronen, T, Aysto, J, Batist, L, Bowry, M, Bui, VM, Caballero-Folch, R, Cano-Ott, D, Elomaa, V-V, Estevez, E, Farrelly, GF, Garcia, AR, Gomez-Hornillos, B, Gorlychev, V, Hakala, J, Jordan, MD, Jokinen, A, Kolhinen, VS, Kondev, FG, Martinez, T, Mendoza, E, Moore, I, Penttila, H, Podolyak, Zsolt, Reponen, M, Sonnenschein, V, Sonzogni, AA, and Sarriguren, P
Subjects: Nuclear Experiment
Abstract: The beta decays of 86Br and 91Rb have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the IGISOL facility in Jyvaskyla and further purified using the JYFLTRAP. 86Br and 91Rb are considered high priority contributors to the decay heat in reactors. In addition 91Rb was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decay was well known from high-resolution measurements. Our results shows that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized.
Published: 2017

70. Total absorption spectroscopy study of the β decay of Br86 and Rb91

Author: P. J. R. Mason, M. Reponen, D. Cano-Ou, E. Mendoza, Jani Hakala, Tommi Eronen, V. Gorlychev, Juho Rissanen, Berta Rubio, L. Batist, E. Valencia, B. Gomez-Hornillos, W. Gelletly, Ari Jokinen, Volker Sonnenschein, V.-V. Elomaa, T. Martinez, R. Caballero-Folch, Pedro Sarriguren, Amanda Porta, Iain Moore, Muriel Fallot, F. G. Kondev, E. Estevez, Veli Kolhinen, M. Bowry, A.-A. Zakari-Issoufou, G. F. Farrelly, Zs. Podolyák, A. A. Sonzogni, M. D. Jordan, Heikki Penttilä, Alejandro Algora, Jorge Agramunt, J. L. Tain, Juha Äystö, P. H. Regan, Stephen Rice, V. M. Bui, and A. R. García
Subjects: Physics, Fission products, Decay scheme, Total absorption spectroscopy, 010308 nuclear & particles physics, Pandemonium effect, 01 natural sciences, Beta decay, Ionizing radiation, Nuclear physics, 0103 physical sciences, Beta particle, Decay heat, Nuclear Experiment, 010306 general physics
Abstract: The beta decays of 86Br and 91Rb have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the IGISOL facility in Jyvaskyla and further purified using the JYFLTRAP. 86Br and 91Rb are considered high priority contributors to the decay heat in reactors. In addition 91Rb was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decay was well known from high-resolution measurements. Our results shows that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized.
Published: 2017
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71. Total absorption spectroscopy study of the β decay of Br 86 and Rb 91

Author: Rice, S., Algora, A., Tain, J. L., Valencia, E., Agramunt, J., Rubio, B., Gelletly, W., Regan, P. H., Zakari-Issoufou, A. A., Fallot, M., Porta, A., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martínez, T., Mason, P., Mendoza, E., Moore, I., Penttilä, H., Podolyák, Zs, Reponen, M., Sonnenschein, V., Sonzogni, A. A., Sarriguren, P., University of Surrey, University of Valencia, Université de Nantes, University of Jyväskylä, University of Helsinki, RAS - Saint Petersburg Nuclear Physics Institute, BarcelonaTech, CIEMAT, Department of Applied Physics, Argonne National Laboratory, Brookhaven National Laboratory, CSIC, Aalto-yliopisto, and Aalto University
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: The beta decays of Br86 and Rb91 have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the Ion Guide Isotope Separator On-Line facility in Jyväskylä and further purified using the JYFLTRAP. Br86 and Rb91 are considered to be major contributors to the decay heat in reactors. In addition, Rb91 was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decay was well known from high-resolution measurements. Our results show that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated.
Published: 2017

72. Experimental study of Tc 100 β decay with total absorption γ -ray spectroscopy

Author: Guadilla, V., Algora, A., Tain, J.L., Agramunt, J., Jordan, D., Montaner-Pizá, A., Orrigo, S. E. A., Rubio, B., Valencia, E., Suhonen, J., Civitarese, Enrique Osvaldo, Äystö, J., Briz, J. A., Cucoanes, A., Eronen, T., Estienne, M., Fallot, M., Fraile, L.M., Ganioglu, E., Gelletly, W., Gorelov, D., Hakala, J., Jokinen, A., Kankainen, A., Kolhinen, V., Koponen, J., Lebois, M., Martinez, T., Monserrate, M., Moore, I., Nácher, E., Penttilä, H., Pohjalainen, I., Porta, A., Reinikainen, J., Reponen, M., Rinta-Antila, S., Rytkönen, K., Shiba, T., Sonnenschein, V., Sonzogni, A. A., Vedia, V., Voss, A., Wilson, J. N., and Zakari-Issoufou, A.-A.
Subjects: Astronomía, purl.org/becyt/ford/1 [https], Matrix elements, Ciencias Físicas, Física, Beta decay, Beta decay transitions, purl.org/becyt/ford/1.3 [https], CIENCIAS NATURALES Y EXACTAS, Ciencias Exactas
Abstract: The β decay of 100Tc has been studied by using the total absorption γ-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ-ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of 100Mo., Facultad de Ciencias Exactas
Published: 2017
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73. Characterization of a cylindrical plastic {\beta}-detector with Monte Carlo simulations of optical photons

Author: J. L. Tain, K. Rytkönen, W. Gelletly, Juha Äystö, A. Cucoanes, Mikael Reponen, Ari Jokinen, E. Ganioglu, Volker Sonnenschein, Juuso Reinikainen, Heikki Penttilä, S.E.A. Orrigo, D. Jordan, Tommi Eronen, Dmitry Gorelov, José Antonio Briz, M. Lebois, A. Porta, B. Rubio, Jorge Agramunt, T. Martinez, L. M. Fraile, M. Estienne, Jukka Koponen, Annika Voss, Enrique Nácher, J. N. Wilson, Iain Moore, V. Vedia, Sami Rinta-Antila, Anu Kankainen, T. Shiba, Veli Kolhinen, A.-A. Zakari-Issoufou, V. Guadilla, E. Valencia, M. Monserrate, M. Fallot, A. Algora, Jani Hakala, Ilkka Pohjalainen, A. Montaner-Pizá, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Educación (España), European Commission, and Ministerio de Economía y Competitividad (España)
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Photon, Total absorption spectroscopy, optical photons, Monte Carlo method, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Electromagnetic radiation, Monte Carlo simulations, Optics, 0103 physical sciences, Plastic scintillators, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], plastic scintillators, 010306 general physics, Absorption (electromagnetic radiation), Nuclear Experiment, Instrumentation, Physics, Spectrometer, ta114, 010308 nuclear & particles physics, business.industry, Detector, total absorption spectroscopy, Computational physics, Optical photons, Dynamic Monte Carlo method, business
Abstract: V. Guadilla et al. -- 5 pags., 8 figs., tab., In this work we report on the Monte Carlo study performed to understand and reproduce experimental measurements of a new plastic β-detector with cylindrical geometry. Since energy deposition simulations differ from the experimental measurements for such a geometry, we show how the simulation of production and transport of optical photons does allow one to obtain the shapes of the experimental spectra. Moreover, taking into account the computational effort associated with this kind of simulation, we develop a method to convert the simulations of energy deposited into light collected, depending only on the interaction point in the detector. This method represents a useful solution when extensive simulations have to be done, as in the case of the calculation of the response function of the spectrometer in a total absorption γ-ray spectroscopy analysis., This work has been supported by the Spanish Ministerio de Economía y Competitividad under grants FPA2011-24553, AIC-A-2011-0696, FPA2014-52823-C2-1-P and the program Severo Ochoa (SEV-2014-0398), by the European Commission under the FP7/EURATOM contract 605203, and by the Spanish Ministerio de Educación under the FPU12/01527 grant.
Published: 2017
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74. r Process (n, $\gamma $) Rate Constraints from the $\gamma $ Emission of Neutron Unbound States in $\beta $-Decay

Author: Stephen Rice, Juho Rissanen, J. N. Wilson, Volker Sonnenschein, Viki-Veikko Elomaa, Muriel Fallot, A. Algora, Jani Hakala, E. Valencia, R. Caballero-Folch, P. J. R. Mason, Iain Moore, Anu Kankainen, S. E. A. Orrigo, F. G. Kondev, Veli Kolhinen, Juha Äystö, A. R. García, D. Cano-Ott, Mikael Reponen, L. Batist, Ari Jokinen, E. Ganioglu, J. L. Tain, M. Lebois, B. Gomez-Hornillos, L. Le Meur, Ilkka Pohjalainen, M. Estienne, M. D. Jordan, M. Monserrate, A. A. Sonzogni, A. Cucoanes, Tommi Eronen, Heikki Penttilä, Jukka Koponen, Enrique Nácher, E. Mendoza, E. Estevez, José Antonio Briz, Amanda Porta, V. Gorlychev, T. Martinez, Jorge Agramunt, Dmitry Gorelov, K. Rytkönen, Juuso Reinikainen, T. Shiba, P. H. Regan, M. Bowry, V. Vedia, B. Rubio, G. F. Farrelly, A.-A. Zakari-Issoufou, Zs. Podolyák, Sami Rinta-Antila, W. Gelletly, Annika Voss, L. M. Fraile, V. Guadilla, V. M. Bui, A. Montaner-Pizá, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, r-process, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract: International audience; Total absorption gamma-ray spectroscopy is used to measure accurately the intensity of γ emission from neutron-unbound states populated in the β-decay of delayed-neutron emitters. From the comparison of this intensity with the intensity of neutron emission a constraint on the (n, γ) cross section for highly unstable neutron-rich nuclei can be deduced. A surprisingly large γ branching was observed for a number of isotopes which might indicate the need to increase by a large factor the Hauser-Feshbach (n, γ) cross-section estimates that impact on r process abundance calculations.
Published: 2017
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75. Total absorption γ -ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb

Author: Valencia, E, Tain, JL, Algora, A, Agramunt, J, Estevez, E, Jordan, MD, Rubio, B, Rice, S, Regan, Patrick, Gelletly, William, Podolyak, Zsolt, Bowry, M, Mason, P, Farrelly, GF, Zakari-Issoufou, A, Fallot, M, Porta, A, and Bui, VM
Subjects: Nuclear Experiment
Abstract: We investigate the decay of 87,88Br and 94Rb using total absorption γ -ray spectroscopy. These important fission products are β-delayed neutron emitters. Our data show considerable βγ intensity, so far unobserved in high-resolution γ -ray spectroscopy, from states at high excitation energy. We also find significant differences with the β intensity that can be deduced from existing measurements of the β spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1–100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for γ emission from neutron unbound states populated in the daughter nucleus. The γ branching is compared to Hauser-Feshbach calculations, which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width γ by one order of magnitude. This increase in γ would lead to a similar increase in the calculated (n,γ ) cross section for this very neutron-rich nucleus with a potential impact on r process abundance calculations.
Published: 2017

76. Total Absorption Gamma-Ray Spectroscopy of the Beta-Delayed Neutron Emitters 87Br, 88Br and 94Rb

Author: Valencia, E., Tain, J. L., Algora, A., Agramunt, J., Rubio, B., Rice, S., Gelletly, W., Regan, P., Zakari-Issoufou, A. -A., Fallot, Muriel, Porta, Amanda, Rissanen, J., Eronen, T., Aysto, J., Batist, L., Bowry, M., Bui, V. M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V. -V., Estevez, E., Farrelly, G. F., Garcia, A. R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M. D., Jokinen, A., Kolhinen, V. S., Kondev, F. G., Martinez, T., Mendoza, E., Moore, I., Penttila, H., Podolyak, Zs., Reponen, M., Sonnenschein, V., Sonzogni, A. A., Laboratoire SUBATECH Nantes (SUBATECH), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)
Subjects: Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; We investigate the decay of 87Br, 88Br and 94Rb using total absorption gamma-ray spectroscopy. These important fission products are beta-delayed neutron emitters. Our data show considerable gamma-intensity, so far unobserved in high-resolution gamma-ray spectroscopy, from states at high excitation energy. We also find significant differences with the beta intensity that can be deduced from existing measurements of the beta spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1 to 100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for gamma emission from neutron unbound states populated in the daughter nucleus. The gamma branching is compared to Hauser-Feshbach calculations which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width by one order-of-magnitude. This leads to a similar increase in the calculated (n,gamma) cross section for this very neutron-rich nucleus with a potential impact on r-process abundance calculations.
Published: 2017
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77. Total absorption γ -ray spectroscopy of the β -delayed neutron emitters Br87 , Br88 , and Rb94

Author: Stephen Rice, Viki-Veikko Elomaa, L. Batist, A. Porta, B. Gomez-Hornillos, T. Martinez, V. Gorlichev, P. H. Regan, D. Cano-Ott, E. Valencia, V. M. Bui, J. L. Tain, M. Fallot, E. Mendoza, Juha Äystö, P. J. R. Mason, M. Bowry, A. A. Sonzogni, A.-A. Zakari-Issoufou, Mikael Reponen, F. G. Kondev, Volker Sonnenschein, B. Rubio, W. Gelletly, M. D. Jordan, Juho Rissanen, Ari Jokinen, Heikki Penttilä, Iain Moore, Zsolt Podolyak, G. F. Farrelly, Alejandro Algora, E. Estevez, Veli Kolhinen, Tommi Eronen, Jani Hakala, A. R. García, R. Caballero-Folch, and J. Agramunt
Subjects: Physics, Fission products, 010308 nuclear & particles physics, Fission, 7. Clean energy, 01 natural sciences, Spectral line, 13. Climate action, Isotopes of bromine, 0103 physical sciences, r-process, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Delayed neutron
Abstract: We investigate the decay of 87,88Br and 94Rb using total absorption γ -ray spectroscopy. These important fission products are β-delayed neutron emitters. Our data show considerable βγ intensity, so far unobserved in high-resolution γ -ray spectroscopy, from states at high excitation energy. We also find significant differences with the β intensity that can be deduced from existing measurements of the β spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1–100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for γ emission from neutron unbound states populated in the daughter nucleus. The γ branching is compared to Hauser-Feshbach calculations, which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width γ by one order of magnitude. This increase in γ would lead to a similar increase in the calculated (n,γ ) cross section for this very neutron-rich nucleus with a potential impact on r process abundance calculations.
Published: 2017
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78. Strong γ-ray emission from neutron unbound states populated in β-decay: Impact on (n,γ) cross-section estimates

Author: T. Shiba, Juho Rissanen, M. Estienne, M. Monserrate, J. N. Wilson, M. Fallot, L. M. Fraile, W. Gelletly, A. R. García, B. Rubio, V. Vedia, Sami Rinta-Antila, A. Montaner-Pizá, Jorge Agramunt, Juha Äystö, Mikael Reponen, José Antonio Briz, K. Rytkönen, F. G. Kondev, A. Algora, Volker Sonnenschein, G. F. Farrelly, Zs. Podolyák, Jani Hakala, M. Lebois, A.-A. Zakari-Issoufou, E. Estevez, Annika Voss, Ari Jokinen, L. Le Meur, E. Valencia, Jukka Koponen, M. D. Jordan, Heikki Penttilä, Tommi Eronen, D. Cano-Ott, Enrique Nácher, E. Mendoza, Ilkka Pohjalainen, R. Caballero-Folch, T. Martinez, V. Guadilla, E. Ganioglu, Iain Moore, Anu Kankainen, P. H. Regan, Veli Kolhinen, V. Gorlychev, Dmitry Gorelov, P. J. R. Mason, V.-V. Elomaa, M. Bowry, V.M. Bui, S.E.A. Orrigo, A. A. Sonzogni, Stephen Rice, L. Batist, A. Porta, B. Gomez-Hornillos, Juuso Reinikainen, J. L. Tain, A. Cucoanes, Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., Oberstedt, S., Universidad de Valencia, Academy of Finland, Engineering and Physical Sciences Research Council (UK), National Measurement Office (UK), European Commission, Department of Energy (US), SCOAP, and Ministerio de Economía y Competitividad (España)
Subjects: Physics, ta114, 010308 nuclear & particles physics, Branching fraction, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Nuclear Theory, 7. Clean energy, 01 natural sciences, 3. Good health, 0103 physical sciences, r-process, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nucleon, Nuclear Experiment, Delayed neutron, Radioactive decay, astro nuclear physics
Abstract: J. L. Taín et al. -- 6 pags., 7 figs., 1 tab. -- Open Access funded by Creative Commons Atribution Licence 4.0, Total absorption gamma-ray spectroscopy is used to measure accurately the intensity of ¿ emission from neutron-unbound states populated in the ß-decay of delayed-neutron emitters. From the comparison of this intensity with the intensity of neutron emission one can deduce information on the (n,¿) cross section for unstable neutron-rich nuclei of interest in r process abundance calculations. A surprisingly large ¿ branching was observed for a number of isotopes. The results are compared with Hauser-Feshbach calculations and discussed., This work was supported by Spanish Ministerio de Economía y Competitividad under grants FPA2008-06419, FPA2010- 17142, FPA2011-24553, FPA2014-52823-C2-1-P, CPAN CSD- 2007-00042 (Ingenio2010) and the program Severo Ochoa (SEV-2014-0398). WG would like to thank the University of Valencia for support. This work was supported by the Academy of Finland under the Finnish Centre of Excellence Programme 2012-2017 (Project No. 21350). Work supported by EPSRC(UK) and STFC(UK) and the UK National Measurement Office. Work supported by the European Commission under the FP7/EURATOM contract 605203. FGK acknowledges support from the U.S. Department of Energy, under contract number DEAC02- 06CH11357.
Published: 2017

79. Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 87Br, 88Br, and 94Rb

Author: Valencia, E., Tain, J. L., Algora, A., Agramunt, J., Estevez, E., Jordan, M. D., Rubio, B., Rice, S., Regan, P., Gelletly, W., Podolyák, Z., Bowry, M., Mason, P., Farrelly, G. F., Zakari-Issoufou, A., Fallot, M., Porta, A., Bui, V. M., Rissanen, Juho, Eronen, Tommi, Moore, Iain, Penttilä, Heikki, Äystö, Juha, Elomaa, Viki-Veikko, Hakala, Jani, Jokinen, Ari, Kolhinen, Veli, Reponen, Mikael, Sonnenschein, Volker, Cano-Ott, D., Garcia, A. R., Martínez, T., Mendoza, E., Caballero-Folch, R., Gomez-Hornillos, B., Gorlichev, V., Kondev, F. G., Sonzogni, A. A., and Batist, L.
Subjects: total absorption gamma-ray spectroscopy, rubidium, neutron emission, beta decay, bromi, Nuclear Experiment
Abstract: We investigate the decay of 87,88Br and 94Rb using total absorption γ -ray spectroscopy. These important fission products are β-delayed neutron emitters. Our data show considerable βγ intensity, so far unobserved in high-resolution γ -ray spectroscopy, from states at high excitation energy. We also find significant differences with the β intensity that can be deduced from existing measurements of the β spectrum. We evaluate the impact of the present data on reactor decay heat using summation calculations. Although the effect is relatively small it helps to reduce the discrepancy between calculations and integral measurements of the photon component for 235U fission at cooling times in the range 1–100 s. We also use summation calculations to evaluate the impact of present data on reactor antineutrino spectra. We find a significant effect at antineutrino energies in the range of 5 to 9 MeV. In addition, we observe an unexpected strong probability for γ emission from neutron unbound states populated in the daughter nucleus. The γ branching is compared to Hauser-Feshbach calculations, which allow one to explain the large value for bromine isotopes as due to nuclear structure. However the branching for 94Rb, although much smaller, hints of the need to increase the radiative width γ by one order of magnitude. This increase in γ would lead to a similar increase in the calculated (n,γ ) cross section for this very neutron-rich nucleus with a potential impact on r process abundance calculations. peerReviewed
Published: 2017

80. Total absorption spectroscopy study of the $\beta$ decay of $^{86}$Br and $^{91}$Rb

Author: Rice, S., Algora, A., Tain, J.L., Valencia, E., Agramunt, J., Rubio, B., Gelletly, W., Regan, P.H., Zakari-Issoufou, A.A., Fallot, Muriel, Porta, Amanda, Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Bui, V.M., Caballero-Folch, R., Cano-Ott, D., Elomaa, V.V., Estevez, E., Farrelly, G.F., Garcia, A.R., Gomez-Hornillos, B., Gorlychev, V., Hakala, J., Jordan, M.D., Jokinen, A., Kolhinen, V.S., Kondev, F.G., Martínez, T., Mason, P., Mendoza, E., Moore, I., Penttilä, H., Podolyák, Zs., Reponen, M., Sonnenschein, V., Sonzogni, A.A., Sarriguren, P., Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), and Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST)
Subjects: FOS: Physical sciences, High Energy Physics::Experiment, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: The beta decays of $^{86}$Br and $^{91}$Rb have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the IGISOL facility in Jyv\"askyl\"a and further purified using the JYFLTRAP. $^{86}$Br and $^{91}$Rb are considered to be major contributors to the decay heat in reactors. In addition $^{91}$Rb was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam {\it et al.} assuming that this decay was well known from high-resolution measurements. Our results show that both decays were suffering from the {\it Pandemonium} effect and that the results of Rudstam {\it et al.} should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated., Comment: 11 pages, 13 figures
Published: 2017
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81. Total absorption spectroscopy study of the β decay of 86Br and 91Rb

Author: Rice, S, Algora, A, Tain, JL, Valencia, E, Agramunt, J, Rubio, B, Gelletly, William, Regan, Patrick, Zakari-Issoufou, A-A, Fallot, M, Porta, A, Rissanen, J, Eronen, T, Äystö, J, Batist, L, Bowry, M, Bui, VM, Caballero-Folch, R, Cano-Ott, D, Elomaa, V-V, Estevez, E, Farrelly, GF, Garcia, AR, Gomez-Hornillos, B, Gorlychev, V, Hakala, J, Jordan, MD, Jokinen, A, Kolhinen, VS, Kondev, FG, Martínez, T, Mason, P, Mendoza, E, Moore, I, Penttilä, H, Podolyak, Zsolt, Reponen, M, Sonnenschein, V, Sonzogni, AA, and Sarriguren, P
Subjects: total absorption gamma-ray spectroscopy, rubidium, neutron emission, High Energy Physics::Experiment, beta decay, bromi, Nuclear Experiment
Abstract: The beta decays of 86Br and 91Rb have been studied using the total absorption spectroscopy technique. The radioactive nuclei were produced at the Ion Guide Isotope Separator On-Line facility in Jyväskylä and further purified using the JYFLTRAP. 86Br and 91Rb are considered to be major contributors to the decay heat in reactors. In addition, 91Rb was used as a normalization point in direct measurements of mean gamma energies released in the beta decay of fission products by Rudstam et al. assuming that this decay was well known from high-resolution measurements. Our results show that both decays were suffering from the Pandemonium effect and that the results of Rudstam et al. should be renormalized. The relative impact of the studied decays in the prediction of the decay heat and antineutrino spectrum from reactors has been evaluated. peerReviewed
Published: 2017

82. Total absorption studies of high priority decays for reactor applications: 86Br and 91Rb

Author: V. Vedia, Sami Rinta-Antila, M. Estienne, E. Ganioglu, J. L. Tain, T. Shiba, M. Monserrate, M. Fallot, T. Martinez, A. R. García, W. Gelletly, L. M. Fraile, V.M. Bui, E. Valencia, Iain Moore, A. Cucoanes, J.-Ch. Sublet, M. Lebois, Anu Kankainen, E. Estevez, V. Guadilla, S.E.A. Orrigo, Veli Kolhinen, Juha Äystö, Annika Voss, A. A. Sonzogni, Juho Rissanen, Tommi Eronen, Mikael Reponen, Michael Fleming, Volker Sonnenschein, Zsolt Podolyak, R. Caballero-Folch, J. N. Wilson, José Antonio Briz, Stephen Rice, D. Cano-Ott, F. G. Kondev, M. Bowry, A. Algora, P. H. Regan, Jani Hakala, Viki-Veikko Elomaa, Jorge Agramunt, V. Gorlychev, Jukka Koponen, A. Montaner-Pizá, Enrique Nácher, E. Mendoza, Dmitry Gorelov, B. Rubio, P. J. R. Mason, L. Batist, Juuso Reinikainen, A. Porta, B. Gomez-Hornillos, Ilkka Pohjalainen, K. Rytkönen, D. Jordan, Ari Jokinen, G. F. Farrelly, Heikki Penttilä, A.-A. Zakari-Issoufou, Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., and Oberstedt, S.
Subjects: Physics, ta114, 010308 nuclear & particles physics, QC1-999, 01 natural sciences, Beta decay, Nuclear physics, nuclear masses, Beta (plasma physics), 0103 physical sciences, structure, decay data measurements, Atomic physics, 010306 general physics, Absorption (electromagnetic radiation), Nuclear Experiment
Abstract: Preliminary results from beta decay studies of nuclei that are important for reactor applications are presented. The beta decays have been studied using the total absorption technique (TAS) and the pure beams provided by the JYFLTRAP system at the IGISOL facility of the University of Jyväskylä. peerReviewed
Published: 2017

83. Americium mono-recycling in PWR: A step towards transmutation

Author: A.-A. Zakari-Issoufou, Sylvain David, Baptiste Leniau, A. Nuttin, Quentin Hoarau, R.B.M. Sogbadji, Nicolas Thiollière, Sandra Bouneau, X. Doligez, B. Mouginot, O. Méplan, N. Capellan, Fanny Courtin, Adrien Bidaud, Alice Somaini, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: Curium, 020209 energy, Nuclear engineering, chemistry.chemical_element, Americium, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, Plutonium-240, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Recycling, MOX fuel, Toxicity, Radioactive waste, Scenario, Transmutation, Spent nuclear fuel, Thorium fuel cycle, Plutonium, Nuclear Energy and Engineering, chemistry, Spent fuel, Dynamic fuel cycle, Environmental science, Decay-heat
Abstract: International audience; In contrast to the straight final disposal solution, countries like France have opted to reprocess their nuclear reactors spent fuel and defined another way to take care of sensitive elements such as the plutonium or minor actinides. Even in countries which have chosen to reprocess their spent fuel, americium is still considered as a final disposal waste. Among the minor actinides, americium will remain the main contributor to the toxicity and the decay heat of the spent fuel for thousand of years. Therefore it is important to reduce its quantity. At this time, only fast neutron future reactors are accepted to be efficient enough to transmute the americium from the thermal reactors spent fuel. As we can presume these future reactors will not be available before many decades, a new strategy which consists in recycling americium together with plutonium in pressurize water reactors mixed oxide fuel is proposed. In this paper the benefit and after-effect of this waiting strategy is analyzed. It demonstrates that the americium is indeed transmuted in a PWR quite efficiently (transmutation rate of around 43%) however the spent fuel is, as expected, more concentrated in curium of heavier nuclei. The impact on the fuel cycle (transportation, cooling time) is investigated showing that the key point would be the fabrication of the MOx-Am fuel.
Published: 2017
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84. Experimental study of 100Tc β decay with total absorption γ -ray spectroscopy

Author: Guadilla, V., Algora, A., Tain, J. L., Agramunt, J., Jordan, D., Montaner-Pizá, A., Orrigo, S. E. A., Rubio, B., Valencia, E., Suhonen, Jouni, Civitarese, O., Äystö, Juha, Briz, J. A., Cucoanes, A., Eronen, Tommi, Estienne, M., Fallot, M., Fraile, L. M., Ganioglu, E., Gelletly, W., Gorelov, Dmitry, Hakala, Jani, Jokinen, Ari, Kankainen, Anu, Kolhinen, Veli, Koponen, Jukka, Lebois, M., Martinez, T., Monserrate, M., Moore, Iain, Nácher, E., Penttilä, Heikki, Pohjalainen, Ilkka, Porta, A., Reinikainen, Juuso, Reponen, Mikael, Rinta-Antila, Sami, Rytkönen, Kari, Shiba, T., Sonnenschein, Volker, Sonzogni, A. A., Vedia, V., Voss, Annika, Wilson, J. N., and Zakari-Issoufou, A.-A.
Subjects: total absorption gamma-ray spectroscopy, beta decay
Abstract: The β decay of 100Tc has been studied by using the total absorption γ -ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ -ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of 100Mo. peerReviewed
Published: 2017

85. Study of the β decay of fission products with the DTAS detector

Author: Guadilla, V., Algora, A., Tain, J. L., Agramunt, J., Äystö, Juha, Briz, J. A., Cucoanes, A., Eronen, Tommi, Estienne, M., Fallot, M., Fraile, L. M., Canioglu, E., Gelletly, W., Gorelov, Dmitry, Hakala, Jani, Jokinen, Ari, Jordan, D., Kankainen, Anu, Kolhinen, Veli, Koponen, Jukka, Lebois, M., Martinez, T., Monserrate, M., Montaner-Piza, A., Moore, Iain, Nacher, E., Orrigo, S. E. A., Penttilä, Heikki, Pohjalainen, Ilkka, Porta, A., Reinikainen, Juuso, Reponen, Mikael, Rinta-Antila, Sami, Rubio, B., Rytkönen, Kari, Shiba, T., Sonnenschein, Volker, Sonzogni, A. A., Valencia, E., Vedia, V., Voss, Annika, Wilson, J. N., and Zakari-Issoufou, A.-A.
Subjects: High Energy Physics::Experiment, beta decay, Total Absorption Spectroscopy
Abstract: Total Absorption Spectroscopy measurements of the β decay of 103Mo and 103Tc, important contributors to the decay heat summation calculation in reactors, are reported in this work. The analysis of the experiment, performed at IGISOL with the new DTAS detector, show new β intensity that was not detected in previous measurements with Ge detectors. peerReviewed
Published: 2017

86. Experimental study of 100Tc β decay with total absorption γ-ray spectroscopy

Author: Guadilla Gómez, Víctor, Algora, Alejandro, Taín, José Luis, Agramunt, Jorge, Jordan, D., Montaner-Pizá, A., Orrigo, S. E. A., Rubio, Berta, Valencia, Ebhelixes, Fraile, Luis M., Martínez, T., Nácher, Enrique, Monserrate, Manuel, Vedia, V., Zakari-Issoufou, A. A., info:eu-repo/grantAgreement/EC/FP7/605203, Ministerio de Educación, Cultura y Deporte (España), European Commission, Consejo Superior de Investigaciones Científicas (España), Academy of Finland, Science and Technology Facilities Council (UK), Universidad de Valencia, and Ministerio de Economía y Competitividad (España)
Abstract: V. Guadilla et al. -- 10 pags., 10 figs., 2 tabs., The β decay of Tc100 has been studied by using the total absorption γ-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ-ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of Mo100., This work has been supported by the Spanish Ministerio de Economía y Competitividad under Grants No. FPA2011-24553, No. AIC-A-2011-0696, No. FPA2014-52823-C2-1-P, No. FPA2015-65035-P, and No. FPI/BES-2014-068222, and by the program Severo Ochoa (SEV-2014-0398), by the Spanish Ministerio de Educación, Cultura y Deporte under the FPU12/01527 Grant, by the European Commission under the FP7/EURATOM contract 605203 and the FP7/ENSAR contract 262010, and by the Junta para la Ampliación de Estudios Programme (CSIC JAE-Doc contract) co-financed by FSE. This work has been partially supported by the Academy of Finland under the Finnish Centre of Excellence Programme 2012-2017 (Project No. 213503, Nuclear and Accelerator Based Programme at JYFL). W.G. was supported by the UK Science and Technology Facilities Council (STFC) Grant ST/F012012/1 and by the Atracció de talent VLC-CAMPUS Programme of the University of Valencia.
Published: 2017

87. Experimental study of $^{100}$Tc $\beta$ decay with total absorption $\gamma$-ray spectroscopy

Author: Guadilla, V., Algora, A., Tain, J.L., Agramunt, J., Jordan, D., Montaner-Pizá, A., Orrigo, S.E.A., Rubio, B., Valencia, E., Suhonen, J., Civitarese, O., Äystö, J., Briz, J.A., Cucoanes, A., Eronen, T., Estienne, M., Fallot, M., Fraile, L.M., Ganioglu, E., Gelletly, W., Gorelov, D., Hakala, J., Jokinen, A., Kankainen, A., Kolhinen, V., Koponen, J., Lebois, M., Martinez, T., Monserrate, M., Moore, I., Nácher, E., Penttilä, H., Pohjalainen, I., Porta, A., Reinikainen, J., Reponen, M., Rinta-Antila, S., Rytkönen, K., Shiba, T., Sonnenschein, V., Sonzogni, A.A., Vedia, V., Voss, A., Wilson, J.N., Zakari-Issoufou, A.-A, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: density, molybdenum: double-beta decay, excited state: energy, total-absorption counter, random phase approximation: quasiparticle, technetium: semileptonic decay, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], benchmark, efficiency, gamma ray, ground state, spectrometer, branching ratio, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], numerical calculations, phonon, ruthenium, Monte Carlo, experimental results
Abstract: International audience; The β decay of Tc100 has been studied by using the total absorption γ-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ-ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of Mo100.
Published: 2017
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88. Total Absorption Study of Beta Decays Relevant for Nuclear Applications and Nuclear Structure

Author: A. R. García, M. Reponen, F. Molina, M. B. Gómez-Hornillos, V. Gorlychev, Muriel Fallot, A.-A. Zakari-Issoufou, M. Bowry, R. Caballero-Folch, J. Agramunt, V. Guadilla, V. Kolkinen, V. M. Bui, Ari Jokinen, T. Martinez, Juha Äystö, Amanda Porta, Volker Sonnenschein, M. D. Jordan, Iain Moore, F. G. Kondev, B. Rubio, G. F. Farrelly, Zs. Podolyák, A. Montaner, A. Algora, Jani Hakala, J. L. Tain, P. H. Regan, P. J. R. Mason, E. Valencia, V. Eloma, E. Mendoza, Juho Rissanen, D. Cano-Ott, Heikki Penttilä, E. Estevez, Tommi Eronen, A. A. Sonzogni, Stephen Rice, W. Gelletly, Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Decay scheme, Total absorption spectroscopy, ta114, Nuclear Theory, Gamma ray, Nuclear data, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Beta decay, Nuclear physics, Beta particle, Neutron, Nuclear Experiment
Abstract: An overview is given of our activities related to the study of the beta decay of neutron rich nuclei relevant for nuclear applications. Recent results of the study of the beta decay of 87,88 Br using a new segmented total absorption spectrometer are presented. The measurements were performed at the IGISOL facility using trap-assisted total absorption spectroscopy.
Published: 2014
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89. Characterization and performance of the DTAS detector

Author: Guadilla, V., primary, Tain, J.L., additional, Algora, A., additional, Agramunt, J., additional, Äystö, J., additional, Briz, J.A., additional, Cucoanes, A., additional, Eronen, T., additional, Estienne, M., additional, Fallot, M., additional, Fraile, L.M., additional, Ganioğlu, E., additional, Gelletly, W., additional, Gorelov, D., additional, Hakala, J., additional, Jokinen, A., additional, Jordan, D., additional, Kankainen, A., additional, Kolhinen, V., additional, Koponen, J., additional, Lebois, M., additional, Le Meur, L., additional, Martinez, T., additional, Monserrate, M., additional, Montaner-Pizá, A., additional, Moore, I., additional, Nácher, E., additional, Orrigo, S.E.A., additional, Penttilä, H., additional, Pohjalainen, I., additional, Porta, A., additional, Reinikainen, J., additional, Reponen, M., additional, Rice, S., additional, Rinta-Antila, S., additional, Rubio, B., additional, Rytkönen, K., additional, Shiba, T., additional, Sonnenschein, V., additional, Sonzogni, A.A., additional, Valencia, E., additional, Vedia, V., additional, Voss, A., additional, Wilson, J.N., additional, and Zakari-Issoufou, A.-A., additional
Published: 2018
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90. TAGS measurements of 100Nb ground and isomeric states and 140Cs for neutrino physics with the new DTAS detector

Author: European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación (España), SCOAP, Guadilla Gómez, Víctor, Algora, Alejandro, Taín, José Luis, Agramunt, Jorge, Briz, José Antonio, Fraile, Luis M., Jordan, D., Martínez, T., Monserrate, Manuel, Montaner-Pizá, A., Nácher, Enrique, Orrigo, S. E. A., Rubio, Berta, Valencia, Ebhelixes, Vedia, V., Zakari-Issoufou, A. A., European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación (España), SCOAP, Guadilla Gómez, Víctor, Algora, Alejandro, Taín, José Luis, Agramunt, Jorge, Briz, José Antonio, Fraile, Luis M., Jordan, D., Martínez, T., Monserrate, Manuel, Montaner-Pizá, A., Nácher, Enrique, Orrigo, S. E. A., Rubio, Berta, Valencia, Ebhelixes, Vedia, V., and Zakari-Issoufou, A. A.
Abstract: In this work we report on total absorption ¿-ray spectroscopy measurements of the ß decay of fission products that are important contributors to the antineutrino spectrum. The experiment was performed at IGISOL as a part of a campaign of measurements with the new DTAS spectrometer. Preliminary results of the analysis of the ß decay of 100Nb,100mNb and 140Cs are presented.
Published: 2017

91. Fundamentals of reactor physics with a view to the (possible) futures of nuclear energy

Author: Abdoul-Aziz Zakari-Issoufou, Marc Ernoult, Nicolas Thiollière, Sandra Bouneau, A. Nuttin, Sylvain David, O. Méplan, N. Capellan, X. Doligez, Adrien Bidaud, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Subjects: Fissile material, Scale (chemistry), Nuclear engineering, General Engineering, Energy Engineering and Power Technology, chemistry.chemical_element, Radioactive waste, Natural uranium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010502 geochemistry & geophysics, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Plutonium, Nuclear physics, Nuclear reactor physics, chemistry, 13. Climate action, Plutonium-240, 0103 physical sciences, Energy source, 0105 earth and related environmental sciences
Abstract: International audience; This paper present basic nuclear reactor physics that may help to understand next challenges that nuclear industry have to face in the future. The ones considered in this work are waste production and natural resources consumption. This paper shows that waste and resources are linked by the plutonium status that could be considered as the principal waste or a valuable material that should be saved for a future transition to breeder reactors that could be for instance Sodium-cooled Fast Reactors (SFRs). This kind of reactors does not rely on natural resource supply, as it produces its own fissile material, plutonium-239, after a neutron capture on uranium-238. However, the operation of SFRs needs a huge amount of plutonium that should be produced in current Pressurized Water Reactors (PWRs).Natural uranium available on earth is expected to allow the operation of the global current fleet until approximately 2100 without major issues. The transition from PWRs to SFRs is then needed if and only if the nuclear industry will face an increase at a global scale during this century. If not, plutonium, the most radiotoxic element produced in PWRs, should be considered as a waste. Consequently, the plutonium status depends on the future evolution of nuclear energy. This paper shows that a status-quo means that plutonium should be considered as the most problematic element that should be handled on a long-term basis. On the other hand, a strong increase in nuclear energy on a global scale would imply that plutonium is a valuable material that would make a transition to SFRs possible.
Published: 2016
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92. TAGS measurements of $^{100}$Nb ground and isomeric states and $^{140}$Cs for neutrino physics with the new DTAS detector

Author: D. Jordan, Ilkka Pohjalainen, E. Ganioglu, Tommi Eronen, Muriel Fallot, W. Gelletly, M. Estienne, José Antonio Briz, M. Monserrate, Iain Moore, L. M. Fraile, Anu Kankainen, A. Algora, Jani Hakala, B. Rubio, A.-A. Zakari-Issoufou, Veli Kolhinen, Annika Voss, Volker Sonnenschein, Heikki Penttilä, V. Guadilla, J. N. Wilson, E. Valencia, Juuso Reinikainen, S.E.A. Orrigo, A. A. Sonzogni, A. Cucoanes, Jukka Koponen, Enrique Nácher, M. Lebois, Dmitry Gorelov, K. Rytkönen, Ari Jokinen, Jorge Agramunt, J. L. Tain, T. Martinez, A. Montaner-Pizá, V. Vedia, Sami Rinta-Antila, T. Shiba, Juha Äystö, Mikael Reponen, Amanda Porta, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación (España), SCOAP, Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., and Oberstedt, S.
Subjects: Physics, Fission products, ta114, Spectrometer, 010308 nuclear & particles physics, QC1-999, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Nuclear physics, nuclear masses, 0103 physical sciences, structure, decay data measurements, Neutrino, 010306 general physics, Spectroscopy, Absorption (electromagnetic radiation)
Abstract: V. Guadilla et al. -- 4 pags., 6 figs. -- Open Access funded by Creative Commons Atribution Licence 4.0, In this work we report on total absorption ¿-ray spectroscopy measurements of the ß decay of fission products that are important contributors to the antineutrino spectrum. The experiment was performed at IGISOL as a part of a campaign of measurements with the new DTAS spectrometer. Preliminary results of the analysis of the ß decay of 100Nb,100mNb and 140Cs are presented., This work has been supported by the Spanish Ministerio de Economía y Competitividad under the FPA2011-24553, the AIC-A-2011-0696, the FPA2014-52823-C2-1-P and the SEV- 2014-0398 Grants, by the European Commission under the FP7/EURATOM contract 605203, and by the Spanish Ministerio de Educación under the FPU12/01527 Grant.
Published: 2016
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93. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

Author: T. Martinez, Muriel Fallot, E. Estevez, Iain Moore, J. N. Wilson, L. Batist, Anu Kankainen, W. Gelletly, Amanda Porta, Veli Kolhinen, A. Cucoanes, Alejandro Sonzogni, M. Bowry, Juuso Reinikainen, L. M. Fraile, F. G. Kondev, D. Cano-Ott, Jukka Koponen, V. Gorlychev, Pasi Karvonen, Michael Fleming, F. Molina, Enrique Nácher, E. Mendoza, J. A. Briz, A. Perez, A. Montaner-Pizá, Tommi Eronen, Dmitry Gorelov, Juha Äystö, Ari Jokinen, Mikael Reponen, Juho Rissanen, V. Guadilla, Annika Voss, B. Rubio, L. Le Meur, M. B. Gómez-Hornillos, P. J. R. Mason, E. Ganogliu, Volker Sonnenschein, Jorge Agramunt, V. Vedia, A.-A. Zakari-Issoufou, Sami Rinta-Antila, R. Caballero-Folch, C. Weber, P. H. Regan, J. L. Tain, M. Estienne, M. D. Jordan, M. Monserrate, M. Lebois, Heikki Penttilä, Viki-Veikko Elomaa, V. M. Bui, E. Valencia, Ilkka Pohjalainen, A. Algora, Jani Hakala, Stephen Rice, T. Shiba, S.E.A. Orrigo, A. R. García, Jean-Christophe Sublet, S. Cormon, G. F. Farrelly, Zs. Podolyák, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Plompen, A, Hambsch, FJ, Schillebeeckx, P, Mondelaers, W, Heyse, J, Kopecky, S, Siegler, P, Oberstedt, S, Helsinki Institute of Physics, Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., Oberstedt, S., Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )
Subjects: Total absorption spectroscopy, Fission, QC1-999, CHOOZ, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 114 Physical sciences, Spectral line, law.invention, Physics::Geophysics, Nuclear physics, law, nuclear masses, 0103 physical sciences, structure, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Physics, Fission products, ta114, 010308 nuclear & particles physics, Pressurized water reactor, Nuclear data, Pandemonium effect, PRODUCTS, 13. Climate action, decay data measurements
Abstract: International audience; The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such converted spectra is a complementary approach that consists of determining the antineutrino spectrum by means of the measurement and processing of nuclear data. The beta properties of some key fission products suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gamma-ray Spectroscopy technique (TAGS). The two main contributors to the Pressurized Water Reactor antineutrino spectrum in the region where the spectral distortion has been observed are 92Rb and 142Cs, which have been measured at the radioactive beam facility of the University of Jyväskylä in two TAGS experiments. We present the results of the analysis of the TAGS measurements of the β-decay properties of 92Rb along with preliminary results on 142Cs and report on the measurements already performed.
Published: 2016
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94. The Impact of Reactor Model Simplification for Fuel Evolution: A Bias Quantification for Fuel Cycle Dynamic Simulations

Author: Somaini, A., David, S., Doligez, X., Zakari-Issoufou, A.A., Bidaud, A., Cappelan, N., Meplan, O., Nuttin, A., Prevot, P., Courtin, F., Leniau, B., Mouginot, B., Thiollière, Nicolas, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: International audience; In nuclear scenario studies, the use of simplified assembly models to simulate fuel irradiation in nuclear reactor core can lead to important biases. To calculate the spent fuel composition, the CLASS package (Core Library for Advanced Scenario Simulations) uses a physic model (usually, we define physics model as: 1- Fuel Loading Model, 2- Cross Section Predictor, 3- Bateman Solver), based on a large number of different fuel evolution simulations. For that, a simple and reproducible model has been chosen: the “assembly model” that is described in this paper. In this model, the whole core is represented by a single assembly, or a part of it, with reflecting boundary conditions.As a first step to quantify the errors related to this approximation, three real size assembly configurations have been simulated: a reflected one, an axial open one and a realistic one (with moderator and reflector at its top and bottom). An exhaustive comparison is presented in this paper. Hence this work focuses on the neutron axial leakage impact on burn-up and isotope inventories calculations.Evolutions up to 50 GWd/t have been simulated with the depletion code MURE for all the geometries and main isotope inventories, fission and capture cross sections and Keff have been reported for each time step. Axial leakage effects on neutron spectrum and inventory distributions have been observed. In this paper, a bias quantification of axial leakage and a comparison with homogeneous leakage models, available in the Serpent code, are analyzed.
Published: 2016

95. Characterization of a cylindrical plastic ��-detector with Monte Carlo simulations of optical photons

Author: Guadilla, V., Algora, A., Tain, J. L., Agramunt, J., ��yst��, J., Briz, J. A., Cucoanes, A., Eronen, T., Estienne, M., Fallot, M., Fraile, L. M., Ganioglu, E., Gelletly, W., Gorelov, D., Hakala, J., Jokinen, A., Jordan, D., Kankainen, A., Kolhinen, V., Koponen, J., Lebois, M., Martinez, T., Monserrate, M., Montaner-Piz��, A., Moore, I., N��cher, E., Orrigo, S. E. A., Penttil��, H., Pohjalainen, I., Porta, A., Reinikainen, J., Reponen, M., Rinta-Antila, S., Rubio, B., Rytk��nen, K., Shiba, T., Sonnenschein, V., Valencia, E., Vedia, V., Voss, A., Wilson, J. N., and Zakari-Issoufou, A. -A.
Subjects: FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex)
Abstract: In this work we report on the Monte Carlo study performed to understand and reproduce experimental measurements of a new plastic \b{eta}-detector with cylindrical geometry. Since energy deposition simulations differ from the experimental measurements for such a geometry, we show how the simulation of production and transport of optical photons does allow one to obtain the shapes of the experimental spectra. Moreover, taking into account the computational effort associated with this kind of simulation, we develop a method to convert the simulations of energy deposited into light collected, depending only on the interaction point in the detector. This method represents a useful solution when extensive simulations have to be done, as in the case of the calculation of the response function of the spectrometer in a total absorption ��-ray spectroscopy analysis., submitted to Nuclear Instruments and Methods A
Published: 2016
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96. Experimental study of Tc100 β decay with total absorption γ -ray spectroscopy

Author: Guadilla, V., primary, Algora, A., additional, Tain, J. L., additional, Agramunt, J., additional, Jordan, D., additional, Montaner-Pizá, A., additional, Orrigo, S. E. A., additional, Rubio, B., additional, Valencia, E., additional, Suhonen, J., additional, Civitarese, O., additional, Äystö, J., additional, Briz, J. A., additional, Cucoanes, A., additional, Eronen, T., additional, Estienne, M., additional, Fallot, M., additional, Fraile, L. M., additional, Ganioğlu, E., additional, Gelletly, W., additional, Gorelov, D., additional, Hakala, J., additional, Jokinen, A., additional, Kankainen, A., additional, Kolhinen, V., additional, Koponen, J., additional, Lebois, M., additional, Martinez, T., additional, Monserrate, M., additional, Moore, I., additional, Nácher, E., additional, Penttilä, H., additional, Pohjalainen, I., additional, Porta, A., additional, Reinikainen, J., additional, Reponen, M., additional, Rinta-Antila, S., additional, Rytkönen, K., additional, Shiba, T., additional, Sonnenschein, V., additional, Sonzogni, A. A., additional, Vedia, V., additional, Voss, A., additional, Wilson, J. N., additional, and Zakari-Issoufou, A.-A., additional
Published: 2017
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97. Total absorption spectroscopy study of the β decay of Br86 and Rb91

Author: Rice, S., primary, Algora, A., additional, Tain, J. L., additional, Valencia, E., additional, Agramunt, J., additional, Rubio, B., additional, Gelletly, W., additional, Regan, P. H., additional, Zakari-Issoufou, A.-A., additional, Fallot, M., additional, Porta, A., additional, Rissanen, J., additional, Eronen, T., additional, Äystö, J., additional, Batist, L., additional, Bowry, M., additional, Bui, V. M., additional, Caballero-Folch, R., additional, Cano-Ott, D., additional, Elomaa, V.-V., additional, Estevez, E., additional, Farrelly, G. F., additional, Garcia, A. R., additional, Gomez-Hornillos, B., additional, Gorlychev, V., additional, Hakala, J., additional, Jordan, M. D., additional, Jokinen, A., additional, Kolhinen, V. S., additional, Kondev, F. G., additional, Martínez, T., additional, Mason, P., additional, Mendoza, E., additional, Moore, I., additional, Penttilä, H., additional, Podolyák, Zs., additional, Reponen, M., additional, Sonnenschein, V., additional, Sonzogni, A. A., additional, and Sarriguren, P., additional
Published: 2017
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98. r Process (n, $\gamma $) Rate Constraints from the $\gamma $ Emission of Neutron Unbound States in $\beta $-Decay

Author: Tain, J. L., primary, Guadilla, V., additional, Valencia, E., additional, Algora, A., additional, Zakari-Issoufou, A.-A., additional, Rice, S., additional, Agramunt, J., additional, Äystö, J., additional, Batist, L., additional, Bowry, M., additional, Briz, J. A., additional, Bui, V. M., additional, Caballero-Folch, R., additional, Cano-Ott, D., additional, Cucoanes, A., additional, Elomaa, V.-V., additional, Eronen, T., additional, Estevez, E., additional, Estienne, M., additional, Fallot, M., additional, Farrelly, G. F., additional, Fraile, L. M., additional, Ganioglu, E., additional, Garcia, A. R., additional, Gelletly, W., additional, Gómez-Hornillos, B., additional, Gorelov, D., additional, Gorlychev, V., additional, Hakala, J., additional, Jokinen, A., additional, Jordan, M. D., additional, Kankainen, A., additional, Kolhinen, V. S., additional, Kondev, F. G., additional, Koponen, J., additional, Lebois, M., additional, Le Meur, L., additional, Martínez, T., additional, Mason, P., additional, Mendoza, E., additional, Monserrate, M., additional, Montaner-Pizá, A., additional, Moore, I., additional, Nacher, E., additional, Orrigo, S. E. A., additional, Penttilä, H., additional, Podolyák, Zs., additional, Pohjalainen, I., additional, Porta, A., additional, Regan, P., additional, Reinikainen, J., additional, Reponen, M., additional, Rinta-Antila, S., additional, Rissanen, J., additional, Rubio, B., additional, Rytkönen, K., additional, Shiba, T., additional, Sonnenschein, V., additional, Sonzogni, A. A., additional, Vedia, V., additional, Voss, A., additional, and Wilson, J. N., additional
Published: 2017
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99. Total absorption γ -ray spectroscopy of the β -delayed neutron emitters Br87 , Br88 , and Rb94

Author: Valencia, E., primary, Tain, J. L., additional, Algora, A., additional, Agramunt, J., additional, Estevez, E., additional, Jordan, M. D., additional, Rubio, B., additional, Rice, S., additional, Regan, P., additional, Gelletly, W., additional, Podolyák, Z., additional, Bowry, M., additional, Mason, P., additional, Farrelly, G. F., additional, Zakari-Issoufou, A., additional, Fallot, M., additional, Porta, A., additional, Bui, V. M., additional, Rissanen, J., additional, Eronen, T., additional, Moore, I., additional, Penttilä, H., additional, Äystö, J., additional, Elomaa, V.-V., additional, Hakala, J., additional, Jokinen, A., additional, Kolhinen, V. S., additional, Reponen, M., additional, Sonnenschein, V., additional, Cano-Ott, D., additional, Garcia, A. R., additional, Martínez, T., additional, Mendoza, E., additional, Caballero-Folch, R., additional, Gomez-Hornillos, B., additional, Gorlichev, V., additional, Kondev, F. G., additional, Sonzogni, A. A., additional, and Batist, L., additional
Published: 2017
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100. Study of the $\beta $ Decay of Fission Products with the DTAS Detector

Author: Guadilla, V., primary, Algora, A., additional, Tain, J.L., additional, Agramunt, J., additional, Äystö, J., additional, Briz, J.A., additional, Cucoanes, A., additional, Eronen, T., additional, Estienne, M., additional, Fallot, M., additional, Fraile, L.M., additional, Ganioğlu, E., additional, Gelletly, W., additional, Gorelov, D., additional, Hakala, J., additional, Jokinen, A., additional, Jordan, D., additional, Kankainen, A., additional, Kolhinen, V., additional, Koponen, J., additional, Lebois, M., additional, Martinez, T., additional, Monserrate, M., additional, Montaner-Pizá, A., additional, Moore, I., additional, Nácher, E., additional, Orrigo, S.E.A., additional, Penttilä, H., additional, Pohjalainen, I., additional, Porta, A., additional, Reinikainen, J., additional, Reponen, M., additional, Rinta-Antila, S., additional, Rubio, B., additional, Rytkönen, K., additional, Shiba, T., additional, Sonnenschein, V., additional, Sonzogni, A.A., additional, Valencia, E., additional, Vedia, V., additional, Voss, A., additional, Wilson, J.N., additional, and Zakari-Issoufou, A.-A., additional
Published: 2017
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