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

Author

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

Subjects
Physics, QC1-999
Abstract

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

Published
2020
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2. Development of a Gaseous Proton-Recoil Detector for neutron flux measurements between 0.2 and 2 MeV neutron energy

Author

Marini P., Mathieu L., Aïche M., Chiron T., Hellmuth P., Pedroza J.-L., Kessedjian G., Czajkowski S., Jurado B., and Tsekhanovich I.

Subjects
Physics, QC1-999
Abstract

Absolute measurements of neutron fluence are an essential prerequisite of neutron-induced cross section measurements, dosimetric investigations and neutron beam lines characterisation. Independent and precise neutron flux measurements can be performed with respect to the H(n,p) elastic cross section. However, the use of silicon proton recoil detectors is not straightforward below incident neutron energy of 1 MeV, due to a high background in the detected proton spectrum. A new gaseous proton-recoil detector has been designed to answer the challenge. The detector is described in details and results of the commissioning tests are presented.

Published
2019
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3. The neutrons for science facility at SPIRAL-2

Author

Ledoux X., Aïche M., Avrigeanu M., Avrigeanu V., Balanzat E., Ban-d'Etat B., Ban G., Bauge E., Bélier G., Bém P., Borcea C., Caillaud T., Chatillon A., Czajkowski S., Dessagne P., Doré D., Fischer U., Frégeau M.O., Grinyer J., Guillous S., Gunsing F., Gustavsson C., Henning G., Jacquot B., Jansson K., Jurado B., Kerveno M., Klix A., Landoas O., Lecolley F.R., Lecouey J.L., Majerle M., Marie N., Materna T., Mrázek J., Negoita F., Novák J., Oberstedt S., Oberstedt A., Panebianco S., Perrot L., Plompen A.J.M., Pomp S., Prokofiev A.V., Ramillon J.M., Farget F., Ridikas D., Rossé B., Sérot O., Simakov S.P., Šimečková E., Štefánik M., Sublet J.C., Taïeb J., Tarrío D., Tassan-Got L., Thfoin I., and Varignon C.

Subjects
Physics, QC1-999
Abstract

Numerous domains, in fundamental research as well as in applications, require the study of reactions induced by neutrons with energies from few MeV up to few tens of MeV. Reliable measurements also are necessary to improve the evaluated databases used by nuclear transport codes. This energy range covers a large number of topics like transmutation of nuclear waste, design of future fission and fusion reactors, nuclear medicine or test and development of new detectors. A new facility called Neutrons For Science (NFS) is being built for this purpose on the GANIL site at Caen (France). NFS is composed of a pulsed neutron beam for time-of-flight facility as well as irradiation stations for cross-section measurements. Neutrons will be produced by the interaction of deuteron and proton beams, delivered by the SPIRAL-2 linear accelerator, with thick or thin converters made of beryllium or lithium. Continuous and quasi-mono-energetic spectra will be available at NFS up to 40 MeV. In this fast energy region, the neutron flux is expected to be up to 2 orders of magnitude higher than at other existing time-of-flight facilities. In addition, irradiation stations for neutron-, proton- and deuteron-induced reactions will allow performing cross-section measurements by the activation technique. After a description of the facility and its characteristics, the experiments to be performed in the short and medium term will be presented.

Published
2017
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4. Development of a gaseous proton-recoil detector for fission cross section measurements below 1 MeV neutron energy

Author

Marini P., Mathieu L., Aïche M., Czajkowski S., Jurado B., and Tsekhanovich I.

Subjects
Physics, QC1-999
Abstract

The elastic H(n,p) reaction is sometimes used to measure neutron flux, in order to produce high precision measurements. The use of this technique is not straightforward to use below incident neutron energy of 1 MeV, due to a high background in the detected proton spectrum. Experiments have been carried out at the AIFIRA facility to investigate such background and determine its origin and components. Based on these investigations, a gaseous proton-recoil detector has been designed, with a reduced low energy background.

Published
2016
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5. Development of an experimental set-up for the measurement of neutron-induced fission and capture cross sections of radioactive fissile nuclei

Author

Companis I., Aïche M., Mathieu L., Schillebeeckx P., Heyse J., Barreau G., Czajkowski S., Ducasse Q., Gunsing F., Jurado B., Kessedjian G., Matarranz J., Plompen A.J.M., and Tsekhanovich I.

Subjects
Physics, QC1-999
Abstract

A new experimental set-up for a simultaneous measurement of neutron induced capture and fission cross sections was designed, assembled and optimized. The measurements will be performed at GEel LINear Accelerator (GELINA) neutron time-of-flight facility in Belgium, where neutron cross sections can be measured over a wide energy range with high energy resolution. The fission events detector consists of a dedicated multi-plate high efficiency fission ionization chamber (IC). The γ-rays produced in capture reaction are detected by an efficient array of C6D6 scintillators. Fission γ-rays events are distinguished from capture events by the anticoincidence signals from the IC and the C6D6 detectors. For the undetected fission events a correction has to be applied with respect to the efficiency of the IC that should be high and known with a high precision. Another important issue is the good separation between fission-fragment (FF) and the high alpha pile-up. The performances of the IC during test experiments are presented, focusing in particular on the detection efficiency.

Published
2013
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6. Simultaneous determination of neutron-induced fission and radiative-capture cross sections from decay probabilities obtained with a surrogate reaction

Author

Sanchez, R. Perez, Jurado, B., Meot, V., Roig, O., Dupuis, M., Bouland, O., Denis-Petit, D., Marini, P., Mathieu, L., Tsekhanovich, I., Aiche, M., Audouin, L., Cannes, C., Czajkowski, S., Delpech, S., Gorgen, A., Guttormsen, M., Henriques, A., Kessedjian, G., Nishio, K., Ramos, D., Siem, S., and Zeiser, F.

Subjects
Nuclear Experiment
Abstract

Reliable neutron-induced reaction cross sections of unstable nuclei are essential for nuclear astrophysics and applications but their direct measurement is often impossible. The surrogate-reaction method is one of the most promising alternatives to access these cross sections. In this work, we successfully applied the surrogate-reaction method to infer for the first time both the neutron-induced fission and radiative-capture cross sections of 239Pu in a consistent manner from a single measurement. This was achieved by combining simultaneously-measured fission and gamma-emission probabilities for the 240Pu(4He,4He') surrogate reaction with a calculation of the angular-momentum and parity distributions populated in this reaction. While other experiments measure the probabilities for some selected gamma-ray transitions, we measure the gamma-emission probability. This enlarges the applicability of the surrogate-reaction method., Comment: 8 pages, 3 figures

Published
2020
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8. Measurement of neutron capture and fission cross sections of 233U in the resonance region

Author

Tsekhanovich I., Plompen A.J.M., Simutkin V., Haas B., Jurado B., Boutoux G., Czajkowski S., Schillebeeckx P., Barreau G., Mathieu L., Kessedjian G., Companis I., and Aïche M.

Subjects
Physics, QC1-999
Abstract

In the framework of studies concerning new fuel cycles and nuclear wastes incineration experimental data of the α ratio between capture and fission cross sections of 233U reactions play an important role in the Th/U cycle. The safety evaluation and the detailed performance assessment for the generation IV nuclear-energy system based on 232Th cycle strongly depend on this ratio. Since the current data are scarce and sometimes contradictory, new experimental studies are required. The measurement will take place at the neutron time-of-flight facility GELINA at Geel, designed to perform neutron cross section measurements with high incident neutron-energy resolution. A dedicated high efficiency fission ionization chamber (IC) as fission fragment detector and six C6D6 liquid scintilators sensitive to γ-rays and neutrons will be used. The method, based on the IC energy response study, allowing to distinguish between gammas originating from fission and capture, in the resonance region, will be presented.

Published
2012
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9. Neutron-induced cross sections of short-lived nuclei via the surrogate reaction method

Author

Tassan-Got L., Gunsing F., Sérot O., Matea I., Théroine C., Derkx X., Romain P., Taieb J., Morel P., Pillet N., Gaudefroy L., Faul T., Daugas J.M., Bauge E., Burke J.T., Czajkowski S., Companis I., Capellan N., Barreau G., Mathieu L., Aïche M., Roig O., Méot V., Jurado B., and Boutoux G.

Subjects
Physics, QC1-999
Abstract

The measurement of neutron-induced cross sections of short-lived nuclei is extremely difficult due to the radioactivity of the samples. The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. This method presents the advantage that the target material can be stable or less radioactive than the material required for a neutron-induced measurement. We have successfully used the surrogate reaction method to extract neutron-induced fission cross sections of various short-lived actinides. In this work, we investigate whether this technique can be used to determine neutron-induced capture cross sections in the rare-earth region.

Published
2012
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10. Neutron-induced cross sections of short-lived nuclei via the surrogate reaction method

Author

Morel P., Gaudefroy L., Faul T., Daugas J.M., Bauge E., Burke J.T., Czajkowski S., Companis I., Capellan N., Barreau G., Mathieu L., Aïche M., Roig O., Méot V., Jurado B., Boutoux G., Pillet N., Romain P., Taieb J., Théroine C., Derkx X., Sérot O., Matea I., Tassan-Got L., and Gunsing F.

Subjects
Physics, QC1-999
Abstract

The measurement of neutron-induced cross sections of short-lived nuclei is extremely difficult due to the radioactivity of the samples. The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. This method presents the advantage that the target material can be stable or less radioactive than the material required for a neutron-induced measurement. We have successfully used the surrogate reaction method to extract neutron-induced fission cross sections of various short-lived actinides. In this work, we investigate whether this technique can be used to determine neutron-induced capture cross sections in the rare-earth region.

Published
2011
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11. Neutron-induced capture cross sections via the surrogate reaction method

Author

Pillet N., Morel P., Méot V., Gaudefroy L., Faul T., Daugas J.M., Bauge E., Bail A., Mathieu L., Haas B., Dassié D., Czajkowski S., Companis I., Capellan N., Barreau G., Jurado B., Boutoux G., Aïche M., Roig O., Taieb J., Théroine C., Sérot O., Gunsing F., Burke J.T., Derkx X., and Tassan-Got L.

Subjects
Physics, QC1-999
Abstract

The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. In this method, the compound nucleus is produced via an alternative (surrogate) reaction and its decay (by fission, gamma or neutron emission) is measured in coincidence with the outgoing appropriate charged particle. This technique has enabled neutron-induced cross sections to be extracted for nuclear reactions on short-lived nuclei that otherwise could not be measured. The CENBG collaboration has successfully applied this technique to determine the neutron-induced fission cross sections of several short-lived nuclei such as 233Pa, 242,243Cm and 241Am. These data are very important for the development of the Th/U cycle and for minor actinide transmutation. We currently investigate whether this powerful technique can also be used to determine the neutron-induced capture cross sections. For this purpose we will use the surrogate reaction 174Yb(3He,pγ)176Lu to infer the well known 175Lu(n,γ) cross section and compare the results with the directly measured neutron-induced data. The experimental set-up and the first results will be presented. We will also discuss our future plans to use the surrogate method for extracting actinides (n,γ) cross sections.

Published
2010
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12. Neutron-induced capture cross sections of short-lived actinides with the surrogate reaction method

Author

Gunsing F., Bauge E., Sérot O., Faul T., Pillet N., Taieb J., Gaudefroy L., Roig O., Méot V., Haas B., Dassie D., Czajkowski S., Matthieu L., Barreau G., Jurado B., Boutoux G., and Aïche M.

Subjects
Physics, QC1-999
Abstract

Determination of neutron-capture cross sections of short-lived nuclei is opening the way to understand and clarify the properties of many nuclei of interest for nuclear structure physics, nuclear astrophysics and particularly for transmutation of nuclear wastes. The surrogate approach is well-recognized as a potentially very useful method to extract neutron cross sections for low-energy compound-nuclear reactions and to overcome the difficulties related to the target radioactivity. In this work we will assess where we stand on these neutron-capture cross section measurements and how we can achieve the short-lived Minor Actinides nuclei involved in the nuclear fuel cycle. The CENBG collaboration applied the surrogate method to determine the neutron-capture cross section of 233Pa (T1/2 = 27 d). The 233Pa (n,γ) cross section is then deduced from the measured gamma decay probability of 234Pa compound nucleus formed via the surrogate 232Th(3He,p) reaction channel. The obtained cross section data, covering the neutron energy range 0.1 to 1 MeV, have been compared with the predictions of the Hauser-Feshbach statistical model. The importance of establishing benchmarks is stressed for the minor actinides region. However, the lack of desired targets led us to propose recently the 174Yb (3He,pγ) reaction as a surrogate reaction for the (n,γ) predetermined benchmark cross section of 175Lu. An overview of the experimental setup combining gamma ray detectors such as Ge and C6D6 in coincidence with light charged particles ΔE-E Telescopes will be presented and preliminary results will be discussed.

Published
2010
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13. Neutron-induced fission cross sections of short-lived actinides with the surrogate reaction method

Author

Janssens R.V.F., Greene J.P., Ahmad I., Perrot L., Billebaud A., Bauge E., Sérot O., Theisen Ch., Lucas R., Lecoz Y., Hürstel A., Gunsing F., Bouchez E., Berthoumieux E., Andriamonje S., Wilson J.N., Tassan-Got L., Capellan N., Audouin L., Santiamon F., Rizea C., Misicu S., Mathieu L., Karamanis D., Haas B., Guiral A., Grosjean C., Dassie D., Czajkowski S., Carjan N., Boyer S., Barreau G., Bidaud A., Petit M., Aïche M., Jurado B., and Kessedjian G.

Subjects
Physics, QC1-999
Abstract

We present a review of the fission cross section measurements made by the CENBG collaboration over the last years using the surrogate reaction method. For example the neutron-induced fission cross sections of 233Pa(T1/2 = 27 d), 242Cm(T1/2 d) and 243Cm(T1/2 y) have been obtained by our group with this technique. The advantages and the difficulties of the surrogate method are discussed. Special attention is paid to the comparison between cross sections measured with the surrogate method and those obtained directly with neutrons at low energies. This comparison provides information on possible differences between the spin-parity distributions achieved in the two methods.

Published
2010
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14. A new gas-based proton-recoil telescope for quasi-absolute neutron flux measurements between 0.2 and 2 MeV neutron energy

Author

Marini, P., Mathieu, L., Aïche, M., Pedroza, J. -L., Chiron, T., Baron, P., Czajkowski, S., Druillole, F., Hellmuth, P., Jurado, B., Rebii, A., and Tsekhanovich, I.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Absolute measurements of neutron flux are an essential prerequisite of neutron-induced cross section measurements, neutron beam lines characterization and dosimetric investigations. A new gaseous detector has been developed for measurements of 0.2 to 2 MeV neutron flux based on proton-recoil process. The detector, consisting of two segmented ionization chambers read by Micromegas technology, has beed conceived to provide quasi-absolute neutron flux measurements with an accuracy of \simeq3%. The gas pressure flexibility makes the telescope non sensitive to {\gamma} and electrons background, and therefore advantageous over semi-conductor materials as a neutron flux instrument. The adjustable gas pressure and H-sample thickness, the use of Micromegas technology and the tracking capabilities allows the detection of neutrons on a large dynamical range and down to 200 keV with a good rejection of scattered neutron events and random background, Comment: 11 figures, 26 pages

Published
2019

15. Experimental set-up for the simultaneous measurement of fission and gamma-emission probabilities induced by transfer or inelastic-scattering reactions

Author

Sánchez, R. Pérez, Jurado, B., Marini, P., Aiche, M., Czajkowski, S., Denis-Petit, D., Ducasse, Q., Mathieu, L., Tsekhanovich, I., Henriques, A., Méot, V., and Roig, O.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Fission and gamma-emission probabilities induced by transfer or inelastic scattering reactions with light projectile nuclei are very valuable quantities for constraining the models that describe the de-excitation of heavy nuclei. We have developed an experimental set-up that allows us to simultaneously measure fission and gamma-emission probabilities. The measurement of the gamma-emission probability at excitation energies where the fission channel is open is challenging due to the intense background of gamma rays emitted by the fission fragments. We discuss the procedure to subtract such a background and the constraints that this subtraction and other experimental conditions put on the set up. We show that our set-up complies with these constraints., Comment: 18 pages, 10 figures

Published
2019
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16. Application of the EXtrapolated Efficiency Method (EXEM) to infer the gamma-cascade detection efficiency in the actinide region

Author

Ducasse, Q., Jurado, B., Mathieu, L., Marini, P., Morillon, B., Aiche, M., and Tsekhanovich, I.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The study of transfer-induced gamma-decay probabilities is very useful for understanding the surrogate-reaction method and, more generally, for constraining statistical-model calculations. One of the main difficulties in the measurement of gamma-decay probabilities is the determination of the gamma-cascade detection efficiency. In [Nucl. Instrum. Meth. A 700, 59 (2013)] we developed the Extrapolated Efficiency Method (EXEM), a new method to measure this quantity. In this work, we have applied, for the first time, the EXEM to infer the gamma-cascade detection efficiency in the actinide region. In particular, we have considered the 238U(d,p)239U and 238U(3He,d)239Np reactions. We have performed Hauser-Feshbach calculations to interpret our results and to verify the hypothesis on which the EXEM is based. The determination of fission and gamma-decay probabilities of 239Np below the neutron separation energy allowed us to validate the EXEM.

Published
2015
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17. Study of the 238U(d,p) surrogate reaction via the simultaneous measurement of gamma-decay and fission probabilities

Author

Ducasse, Q., Jurado, B., Aïche, M., Marini, P., Mathieu, L., Görgen, A., Guttormsen, M., Larsen, A. C., Tornyi, T., Wilson, J. N., Barreau, G., Boutoux, G., Czajkowski, S., Giacoppo, F., Gunsing, F., Hagen, T. W., Lebois, M., Lei, J., Méot, V., Morillon, B., Moro, A., Renstrøm, T., Roig, O., Rose, S. J., Sérot, O., Siem, S., Tsekhanovich, I., Tveten, G. M., and Wiedeking, M.

Subjects
Nuclear Experiment
Abstract

We investigated the 238U(d,p) reaction as a surrogate for the n + 238U reaction. For this purpose we measured for the first time the gamma-decay and fission probabilities of 239U* simultaneously and compared them to the corresponding neutron-induced data. We present the details of the procedure to infer the decay probabilities, as well as a thorough uncertainty analysis, including parameter correlations. Calculations based on the continuum-discretized coupled-channels and distorted-wave Born approximations were used to correct our data from detected protons originating from elastic and inelastic deuteron breakup. In the region where the fission and gamma-decay probabilities compete, the corrected fission probability is in agreement with neutron-induced data, whereas the gamma-decay probability is much higher than the neutron-induced data. The performed statistical-model calculations are not able to explain these results., Comment: Includes modifications due to referee remarks

Published
2015
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18. Experimental level densities of atomic nuclei

Author

Guttormsen, M., Aiche, M., Garrote, F. L. Bello, Bernstein, L. A., Bleuel, D. L., Byun, Y., Ducasse, Q., Eriksen, T. K., Giacoppo, F., Görgen, A., Gunsing, F., Hagen, T. W., Jurado, B., Klintefjord, M., Larsen, A. C., Lebois, L., Leniau, B., Nyhus, H. T., Renstrøm, T., Rose, S. J., Sahin, E., Siem, S., Tornyi, T. G., Tveten, G. M., Voinov, A., Wiedeking, M., and Wilson, J.

Subjects
Nuclear Experiment
Abstract

It is almost 80 years since Hans Bethe described the level density as a non-interacting gas of protons and neutrons. In all these years, experimental data were interpreted within this picture of a fermionic gas. However, the renewed interest of measuring level density using various techniques calls for a revision of this description. In particular, the wealth of nuclear level densities measured with the Oslo method favors the constant-temperature level density over the Fermi-gas picture. From the basis of experimental data, we demonstrate that nuclei exhibit a constant-temperature level density behavior for all mass regions and at least up to the neutron threshold., Comment: 8 pages, 8 figures

Published
2015
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19. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author

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

Published
2020
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21. Scissors resonance in the quasi-continuum of Th, Pa and U isotopes

Author

Guttormsen, M., Bernstein, L. A., Görgen, A., Jurado, B., Siem, S., Aiche, M., Ducasse, Q., Giacoppo, F., Gunsing, F., Hagen, T. W., Larsen, A. C., Lebois, M., Leniau, B., Renstrøm, T., Rose, S. J., Tornyi, T. G., Tveten, G. M., Wiedeking, M., and Wilson, J. N.

Subjects
Nuclear Experiment
Abstract

The gamma-ray strength function in the quasi-continuum has been measured for 231-233Th, 232,233Pa and 237-239U using the Oslo method. All eight nuclei show a pronounced increase in gamma strength at omega_SR approx 2.4 MeV, which is interpreted as the low-energy M1 scissors resonance (SR). The total strength is found to be B_SR = 9-11 mu_N^2 when integrated over the 1 - 4 MeV gamma-energy region. The SR displays a double-hump structure that is theoretically not understood. Our results are compared with data from (gamma, gamma') experiments and theoretical sum-rule estimates for a nuclear rigid-body moment of inertia., Comment: 11 pages, 9 figures

Published
2013
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22. Constant-temperature level densities in the quasi-continuum of Th and U isotopes

Author

Guttormsen, M., Jurado, B., Wilson, J. N., Aiche, M., Bernstein, L. A., Ducasse, Q., Giacoppo, F., Goergen, A., Gunsing, F., Hagen, T. W., Larsen, A. C., Lebois, M., Leniau, B., Renstroem, T., Rose, S. J., Siem, S., Tornyi, T., Tveten, G. M., and Wiedeking, M.

Subjects
Nuclear Experiment
Abstract

Particle-gamma coincidences have been measured to obtain gamma-ray spectra as a function of excitation energy for 231-233Th and 237-239U. The level densities, which were extracted using the Oslo method, show a constant temperature behavior. The isotopes display very similar temperatures in the quasi-continuum, however, the even-odd isotopes reveal a constant entropy increase Delta S compared to their even-even neighbors. The entropy excess depends on available orbitals for the last unpaired valence neutron of the heated nuclear system. Also, experimental microcanonical temperature and heat capacity have been extracted. Several poles in the heat capacity curve support the idea that an almost continuous melting of Cooper pairs is responsible for the constant-temperature behavior., Comment: 9 figures

Published
2013
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27. The electron–ion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR)—A conceptual design study

Author

Antonov, A.N., Gaidarov, M.K., Ivanov, M.V., Kadrev, D.N., Aïche, M., Barreau, G., Czajkowski, S., Jurado, B., Belier, G., Chatillon, A., Granier, T., Taieb, J., Doré, D., Letourneau, A., Ridikas, D., Dupont, E., Berthoumieux, E., Panebianco, S., Farget, F., Schmitt, C., Audouin, L., Khan, E., Tassan-Got, L., Aumann, T., Beller, P., Boretzky, K., Dolinskii, A., Egelhof, P., Emling, H., Franzke, B., Geissel, H., Kelic-Heil, A., Kester, O., Kurz, N., Litvinov, Y., Münzenberg, G., Nolden, F., Schmidt, K.-H., Scheidenberger, Ch., Simon, H., Steck, M., Weick, H., Enders, J., Pietralla, N., Richter, A., Schrieder, G., Zilges, A., Distler, M.O., Merkel, H., Müller, U., Junghans, A.R., Lenske, H., Fujiwara, M., Suda, T., Kato, S., Adachi, T., Hamieh, S., Harakeh, M.N., Kalantar-Nayestanaki, N., Wörtche, H., Berg, G.P.A., Koop, I.A., Logatchov, P.V., Otboev, A.V., Parkhomchuk, V.V., Shatilov, D.N., Shatunov, P.Y., Shatunov, Y.M., Shiyankov, S.V., Shvartz, D.I., Skrinsky, A.N., Chulkov, L.V., Danilin, B.V., Korsheninnikov, A.A., Kuzmin, E.A., Ogloblin, A.A., Volkov, V.A., Grishkin, Y., Lisin, V.P., Mushkarenkov, A.N., Nedorezov, V., Polonski, A.L., Rudnev, N.V., Turinge, A.A., Artukh, A., Avdeichikov, V., Ershov, S.N., Fomichev, A., Golovkov, M., Gorshkov, A.V., Grigorenko, L., Klygin, S., Krupko, S., Meshkov, I.N., Rodin, A., Sereda, Y., Seleznev, I., Sidorchuk, S., Syresin, E., Stepantsov, S., Ter-Akopian, G., Teterev, Y., Vorontsov, A.N., Kamerdzhiev, S.P., Litvinova, E.V., Karataglidis, S., Alvarez Rodriguez, R., Borge, M.J.G., Fernandez Ramirez, C., Garrido, E., Sarriguren, P., Vignote, J.R., Fraile Prieto, L.M., Lopez Herraiz, J., Moya de Guerra, E., Udias-Moinelo, J., Amaro Soriano, J.E., Lallena Rojo, A.M., Caballero, J.A., Johansson, H.T., Jonson, B., Nilsson, T., Nyman, G., Zhukov, M., Golubev, P., Rudolph, D., Hencken, K., Jourdan, J., Krusche, B., Rauscher, T., Kiselev, D., Trautmann, D., Al-Khalili, J., Catford, W., Johnson, R., Stevenson, P.D., Barton, C., Jenkins, D., Lemmon, R., Chartier, M., Cullen, D., Bertulani, C.A., and Heinz, A.

Published
2011
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28. Neutron-induced fission and radiative-capture cross sections from decay probabilities obtained with a surrogate reaction

Author

Sánchez, R. Pérez, Jurado, B., Méot, V., Roig, O., Dupuis, M., Bouland, O., Denis-Petit, D., Marini, P., Mathieu, L., Tsekhanovich, I., Aïche, M., Audouin, L., Cannes, C., Czajkowski, S., Delpech, S., Görgen, A., Guttormsen, M., Henriques, A., Kessedjian, G., Nishio, K., Ramos, D., Siem, S., Zeiser, F., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA Cadarache, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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
Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Reliable neutron-induced reaction cross sections of unstable nuclei are essential for nuclear astrophysics and applications but their direct measurement is often impossible. The surrogate-reaction method is one of the most promising alternatives to access these cross sections. However, its use is hampered by the need to account for the differences between the angular momenta and parities populated by the surrogate and the neutron-induced reactions. Here we show that it is possible to overcome this limitation and infer for the first time both the neutron-induced fission and radiative-capture cross sections of 239Pu. This was achieved by combining simultaneously-measured fission and gamma-emission probabilities for the 240Pu(4He,4He') surrogate reaction with a calculation of the angular-momentum and parity distributions populated in this reaction.

Published
2020

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

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE). H2020, Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Quesada Molina, José Manuel, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE). H2020, Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, and Quesada Molina, José Manuel

Abstract

In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed.

Published
2020

32. Simultaneous Determination of Neutron-Induced Fission and Radiative Capture Cross Sections from Decay Probabilities Obtained with a Surrogate Reaction

Author

Pérez Sánchez, R., primary, Jurado, B., additional, Méot, V., additional, Roig, O., additional, Dupuis, M., additional, Bouland, O., additional, Denis-Petit, D., additional, Marini, P., additional, Mathieu, L., additional, Tsekhanovich, I., additional, Aïche, M., additional, Audouin, L., additional, Cannes, C., additional, Czajkowski, S., additional, Delpech, S., additional, Görgen, A., additional, Guttormsen, M., additional, Henriques, A., additional, Kessedjian, G., additional, Nishio, K., additional, Ramos, D., additional, Siem, S., additional, and Zeiser, F., additional

Published
2020
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33. Dipole bands in the oblate-shaped195Pb

Author

Kaci, M., Porquet, M -G., Hannachi, F., Aïche, M., Bastin, G., Deloncle, I., Gall, B. J. P., Schück, C., Azaiez, F., Beausang, C. W., Bourgeois, C., Clark, R. M., Duffait, R., Duprat, J., Hauschild, K., Joyce, M. J., Korichi, A., Le Coz, Y., Meyer, M., Paul, E. S., Perrin, N., Poffé, N., Redon, N., Sergolle, H., Sharpey-Schafer, J. F., Simpson, J., Smith, A. G., and Wadsworth, R.

Published
1996
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34. Effects of the nuclear structure of fission fragments on the high-energy prompt fission $\gamma$-ray spectrum in $^{235}\mathrm{U}({n}_{\mathrm{th}},f)$

Author

Makii, H., Nishio, K., Hirose, K., Orlandi, R., Léguillon, R., Ogawa, T., Soldner, T., Köster, U., Pollitt, A., Hambsch, F.J., Tsekhanovich, I., Aïche, M., Czajkowski, S., Mathieu, L., Petrache, C.M., Astier, A., Guo, S., Ohtsuki, T., Sekimoto, S., Takamiya, K., Frost, R.J.W., Kawano, T., Institut Laue-Langevin (ILL), ILL, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), 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
Nuclear Reactions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The prompt fission γ-ray energy spectrum for cold-neutron-induced fission of U235 was measured in the energy range Eγ=0.8–20MeV, by gaining a factor of about 105 in statistics compared to the measurements performed so far. The spectrum exhibits local bump structures at Eγ≈4MeV and ≈6MeV, and also a broad one at ≈15MeV. In order to understand the origins of these bumps, the γ-ray spectra were calculated using a statistical Hauser-Feshbach model, taking into account the deexcitation of all the possible primary fission fragments. It is shown that the bump at ≈4MeV is created by the transitions between the discrete levels in the fragments around Sn132, and the bump at ≈6MeV mostly comes from the complementary light fragments. It is also indicated that a limited number of nuclides, which have high-spin states at low excitation energies, can contribute to the bump structure around Eγ≈15MeV, induced by the transition feeding into the low-lying high-spin states.

Published
2019

35. Determination of the 233Pa(n, f) reaction cross section from 0.5 to 10 MeV neutron energy using the transfer reaction 232Th( 3He, p) 234Pa

Author

Petit, M., Aiche, M., Barreau, G., Boyer, S., Carjan, N., Czajkowski, S., Dassié, D., Grosjean, C., Guiral, A., Haas, B., Karamanis, D., Misicu, S., Rizea, C., Saintamon, F., Andriamonje, S., Bouchez, E., Gunsing, F., Hurstel, A., Lecoz, Y., Lucas, R., Theisen, Ch., Billebaud, A., Perrot, L., and Bauge, E.

Published
2004
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39. Effects of the nuclear structure of fission fragments on the high-energy prompt fission γ -ray spectrum in U235(nth,f)

Author

Makii, H., primary, Nishio, K., additional, Hirose, K., additional, Orlandi, R., additional, Léguillon, R., additional, Ogawa, T., additional, Soldner, T., additional, Köster, U., additional, Pollitt, A., additional, Hambsch, F.-J., additional, Tsekhanovich, I., additional, Aïche, M., additional, Czajkowski, S., additional, Mathieu, L., additional, Petrache, C. M., additional, Astier, A., additional, Guo, S., additional, Ohtsuki, T., additional, Sekimoto, S., additional, Takamiya, K., additional, Frost, R. J. W., additional, and Kawano, T., additional

Published
2019
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40. Multiparticle excitations in 194Pb

Author

Kaci, M., Porquet, M.-G., Deloncle, I., Aiche, M., Azaiez, F., Bastin, G., Beausang, C.W., Bourgeois, C., Clark, R.M., Duffait, R., Duprat, J., Gall, B.J.P., Hannachi, F., Hauschild, K., Joyce, M.J., Korichi, A., Le Coz, Y., Meyer, M., Paul, E.S., Perrin, N., Poffé, N., Redon, N., Schück, C., Sergolle, H., Sharpey-Schafer, J.F., Simpson, J., Smith, A.G., and Wadsworth, R.

Published
2002
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41. $^{242}\mathrm{Pu}$ neutron-induced fission cross-section measurement from 1 to 2 MeV neutron energy

Author

Marini, P., Mathieu, L., Aïche, M., Belier, G., Czajkowski, S., Ducasse, Q., Jurado, B., Kessedjian, G., Matarranz, J., Plompen, A., Salvador-Castiñeira, P., Taieb, J., Tsekhanovich, I., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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]), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; Relative values of the neutron-induced fission cross section σ(n,f) of 242Pu have been measured with respect to the standard 1H(n,p) elastic scattering cross section, at average energies of 1.0, 1.4, and 1.9MeV. The measurements are part of an international effort to reduce uncertainties and provide independent nuclear data relevant for fast-spectrum reactors. The shape of the measured cross section is in good agreement with data from Tovesson et al. [Phys. Rev. C 79, 014613 (2009)] and with the most recent data from Matei et al. [Phys. Rev. C 95, 024606 (2017)], but disagrees with the shapes of ENDF/B-VII.1 and JEFF3.2 evaluations. Absolute values of σ(n,f), obtained under some assumptions, indicate an overestimation of σ(n,f) in the evaluated libraries at 1.0 and 1.4MeV, while a good agreement is found with ENDF/B-VII.1 at 1.9MeV. A careful analysis of the impact of scattered neutrons and anisotropy of the fission fragment angular distribution has been performed. The measurement of the neutron flux by means of a proton-recoil detector is discussed. A comprehensive study of corrections applied to the data, of associated uncertainties, and of correlations between the measurements at the different energies is presented.

Published
2017

42. A new detector system for the measurement of high-energy prompt γ-rays for low-energy neutron induced fission

Author

Makii, H., primary, Nishio, K., additional, Hirose, K., additional, Orlandi, R., additional, Léguillon, R., additional, Ogawa, T., additional, Soldner, T., additional, Hambsch, F.-J., additional, Aïche, M., additional, Astier, A., additional, Czajkowski, S., additional, Frost, R., additional, Guo, S., additional, Köster, U., additional, Mathieu, L., additional, Ohtsuki, T., additional, Petrache, C.M., additional, Pollitt, A., additional, Sekimoto, S., additional, Takamiya, K., additional, and Tsekhanovich, I., additional

Published
2018
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43. The Neutrons for Science Facility at SPIRAL-2

Author

Ledoux, X, primary, Aïche, M, additional, Avrigeanu, M, additional, Avrigeanu, V, additional, Balanzat, E, additional, Ban-d’Etat, B, additional, Ban, G, additional, Bauge, E, additional, Bélier, G, additional, Bém, P, additional, Borcea, C, additional, Caillaud, T, additional, Chatillon, A, additional, Czajkowski, S, additional, Dessagne, P, additional, Doré, D, additional, Fischer, U, additional, Frégeau, M O, additional, Grinyer, J, additional, Guillous, S, additional, Gunsing, F, additional, Gustavsson, C, additional, Henning, G, additional, Jacquot, B, additional, Jansson, K, additional, Jurado, B, additional, Kerveno, M, additional, Klix, A, additional, Landoas, O, additional, Lecolley, F R, additional, Lecouey, J L, additional, Majerle, M, additional, Marie, N, additional, Materna, T, additional, Mrázek, J, additional, Novák, J, additional, Oberstedt, S, additional, Oberstedt, A, additional, Panebianco, S, additional, Perrot, L, additional, Plompen, A J M, additional, Pomp, S, additional, Prokofiev, A V, additional, Ramillon, J M, additional, Farget, F, additional, Ridikas, D, additional, Rossé, B, additional, Serot, O, additional, Simakov, S P, additional, Šimečková, E, additional, Stanoiu, M, additional, Štefánik, M, additional, Sublet, J C, additional, Taïeb, J, additional, Tarrío, D, additional, Tassan-Got, L, additional, Thfoin, I, additional, and Varignon, C, additional

Published
2017
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45. The neutrons for science facility at SPIRAL-2

Author

Ledoux, X., Aïche, M., Avrigeanu, M., Avrigeanu, V., Balanzat, E., Ban-d'Etat, B., Ban, G., Bauge, E., Bélier, G., Bém, P., Borcea, C., Caillaud, T., Chatillon, A., Czajkowski, S., Dessagne, P., Doré, D., Fischer, U., Frégeau, M. O., Grinyer, J., Guillous, S., Gunsing, F., Gustavsson, Cecilia, Henning, G., Jacquot, B., Jansson, Kaj, Jurado, B., Kerveno, M., Klix, A., Landoas, O., Lecolley, F. R., Lecouey, J. L., Majerle, M., Marie, N., Materna, T., Mrázek, J., Negoita, F., Novák, J., Oberstedt, S., Oberstedt, A., Panebianco, S., Perrot, L., Plompen, A. J. M., Pomp, Stephan, Prokofiev, Alexander, Ramillon, J. M., Farget, F., Ridikas, D., Rossé, B., Sérot, O., Simakov, S. P., Šimečková, E., Štefánik, M., Sublet, J. C., Taïeb, J., Tarrío, Diego, Tassan-Got, L., Thfoin, I., Varignon, C., Ledoux, X., Aïche, M., Avrigeanu, M., Avrigeanu, V., Balanzat, E., Ban-d'Etat, B., Ban, G., Bauge, E., Bélier, G., Bém, P., Borcea, C., Caillaud, T., Chatillon, A., Czajkowski, S., Dessagne, P., Doré, D., Fischer, U., Frégeau, M. O., Grinyer, J., Guillous, S., Gunsing, F., Gustavsson, Cecilia, Henning, G., Jacquot, B., Jansson, Kaj, Jurado, B., Kerveno, M., Klix, A., Landoas, O., Lecolley, F. R., Lecouey, J. L., Majerle, M., Marie, N., Materna, T., Mrázek, J., Negoita, F., Novák, J., Oberstedt, S., Oberstedt, A., Panebianco, S., Perrot, L., Plompen, A. J. M., Pomp, Stephan, Prokofiev, Alexander, Ramillon, J. M., Farget, F., Ridikas, D., Rossé, B., Sérot, O., Simakov, S. P., Šimečková, E., Štefánik, M., Sublet, J. C., Taïeb, J., Tarrío, Diego, Tassan-Got, L., Thfoin, I., and Varignon, C.

Abstract

Numerous domains, in fundamental research as well as in applications, require the study of reactions induced by neutrons with energies from few MeV up to few tens of MeV. Reliable measurements also are necessary to improve the evaluated databases used by nuclear transport codes. This energy range covers a large number of topics like transmutation of nuclear waste, design of future fission and fusion reactors, nuclear medicine or test and development of new detectors. A new facility called Neutrons For Science (NFS) is being built for this purpose on the GANIL site at Caen (France). NFS is composed of a pulsed neutron beam for time-of-flight facility as well as irradiation stations for cross-section measurements. Neutrons will be produced by the interaction of deuteron and proton beams, delivered by the SPIRAL-2 linear accelerator, with thick or thin converters made of beryllium or lithium. Continuous and quasi-mono-energetic spectra will be available at NFS up to 40 MeV. In this fast energy region, the neutron flux is expected to be up to 2 orders of magnitude higher than at other existing time-of-flight facilities. In addition, irradiation stations for neutron-, proton- and deuteron-induced reactions will allow performing cross-section measurements by the activation technique. After a description of the facility and its characteristics, the experiments to be performed in the short and medium term will be presented.

Published
2017
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46. Measurement of 242Pu(n,f) in the 1-2 MeV energy range

Author

Mathieu Ludovic, Aïche Mourad, Marini Paola, Bouland Olivier, Chatel Carole, Czajkowski Serge, Kattikat-Melcom Deby, Kurtukian Teresa, Oberstedt Stephan, and Tsekhanovich Igor

Subjects
Physics, QC1-999
Abstract

The design of new generation fast nuclear reactors requires highly accurate cross-section measurements in the MeV energy region. The 242Pu fission cross section is of particular interest for Pu incineration and nuclear waste production. There are discrepancies around 1 MeV incident neutron energy between libraries and among experimental data. Some data suggest the presence of a strong structure between 1 and 1.2 MeV whereas it is barely visible on some other data and its shape is very different among evaluations. The large majority of the 242Pu(n,f) measurements have been carried out with respect to the 235U(n,f) secondary-standard cross section. This introduces a strong correlation between measurements from different research teams. Moreover, this reference cross section exhibits structures, in particular a steep increase of +10% at 1 MeV. Therefore, we aim to re-measure the 242Pu(n,f) cross section relative to the primary-standard 1H(n,n)p cross section, by using a proton recoil detector. This standard has a very high accuracy (0.4%), is not used for other 242Pu measurements, and is structureless. An experiment has been carried out in October 2022 at the MONNET facility in JRC Geel, with incident neutron energies from 0.9 MeV to 2.0 MeV. The experimental setup will be presented, and the analysis procedure will be detailed.

Published
2024
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47. Investigation of the 238U(d, p) surrogate reaction via the simultaneous measurement of γ -decay and fission probabilities

Author

Ducasse, Q., Jurado, B., Aïche, M., Marini, P., Mathieu, L., Görgen, A., Wiedeking, M., Lei, Jin, Moro Muñoz, Antonio Matías, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and European Commission (EC)

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We investigated the 238U(d,p) reaction as a surrogate for the n + 238U reaction. For this purpose we measured for the first time the γ -decay and fission probabilities of 239U∗ simultaneously and compared them to the corresponding neutron-induced data. We present the details of the procedure to infer the decay probabilities, as well as a thorough uncertainty analysis, including parameter correlations. Calculations based on the continuumdiscretized coupled-channels method and the distorted-wave Born approximation (DWBA) were used to correct our data from detected protons originating from elastic and inelastic deuteron breakup. In the region where fission and γ emission compete, the corrected fission probability is in agreement with neutron-induced data, whereas the γ -decay probability is much higher than the neutron-induced data. We have performed calculations of the decay probabilities with the statistical model and of the average angular momentum populated in the 238U(d,p) reaction with the DWBA to interpret these results Comisión Europea 269499

Published
2016

48. Study of the 238U(d,p) surrogate reaction via the simultaneous measurement of gamma-decay and fission probabilities

Author

Ducasse, Q., Jurado, B., Aïche, M., Marini, P., Mathieu, L., Görgen, A., Guttormsen, M., Larsen, A. C., Tornyi, T., Wilson, J. N., Barreau, G., Boutoux, G., Czajkowski, S., Giacoppo, F., Gunsing, F., Hagen, T. W., Lebois, M., Lei, J., Méot, V., Morillon, B., Moro, A., Renstrøm, T., Roig, O., Rose, S. J., Serot, Olivier, Siem, S., Tsekhanovich, I., Tveten, G. M., Wiedeking, M., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

We investigated the 238U(d,p) reaction as a surrogate for the n + 238U reaction. For this purpose we measured for the first time the gamma-decay and fission probabilities of 239U* simultaneously and compared them to the corresponding neutron-induced data. We present the details of the procedure to infer the decay probabilities, as well as a thorough uncertainty analysis, including parameter correlations. Calculations based on the continuum-discretized coupled-channels and distorted-wave Born approximations were used to correct our data from detected protons originating from elastic and inelastic deuteron breakup. In the region where the fission and gamma-decay probabilities compete, the corrected fission probability is in agreement with neutron-induced data, whereas the gamma-decay probability is much higher than the neutron-induced data. The performed statistical-model calculations are not able to explain these results., Includes modifications due to referee remarks

Published
2016

49. First observation of a superdeformed nucleus produced in an α xn reaction channel

Author

Duprat, J., Gall, B. J. P., Porquet, M. G., Hannachi, F., Azaiez, F., Aïche, M., Bastin, G., Beausang, C. W., Béraud, R., Bourgeois, C., Clark, R. M., Deloncle, I., Duffait, R., Hauschild, K., Hübel, H., Joyce, M. J., Kaci, M., Korichi, A., Le Coz, Y., Meyer, M., Paul, E. S., Perrin, N., Poffé, N., Redon, N., Schück, C., Sergolle, H., Sharpey-Schafer, J. F., Simpson, J., Smith, A. G., and Wadsworth, R.

Published
1994
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50. D+D fusion reactions in 1018W/cm2intensity and repetitive laser-plasma interactions

Author

Giulietti, D., primary, Boutoux, G., additional, Aïche, M., additional, Andrianaki, G., additional, Batani, D., additional, Burgy, F., additional, Cipriani, M., additional, Consoli, F., additional, De Angelis, R., additional, Ducret, J. E., additional, Hulin, S., additional, Jardin, A., additional, Ingenito, F., additional, Jakubowska, K., additional, Mathieu, L., additional, Mazon, D., additional, Nguyen, A., additional, Pejot, C., additional, Solheilhac, A., additional, Verona, C., additional, and Verona-Rinati, G., additional

Published
2017
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