425 results on '"Serot, O."'
Search Results
2. 235U(nth,f) mass yield evaluation with associated covariance matrix
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Cheikh, S. M., Kessedjian, G., Serot, O., Chebboubi, A., Bernard, D., and Vallet, V.
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- 2024
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3. Study of collision and $\gamma$-cascade times following neutron-capture processes in cryogenic detectors
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CRAB collaboration, Soum-Sidikov, G., Abele, H., Burkhart, J., Cappella, F., Casali, N., Cerulli, R., Chalil, A., Chebboubi, A., Crocombette, J-P., del Castello, G., Roccagiovine, M. del Gallo, Doblhammer, A., Dorer, S., Dumonteil, E., Erhart, A., Giuliani, A., Goupy, C., Gunsing, F., Jericha, E., Kaznacheeva, M., Kinast, A., Kluck, H., Langenkämper, A., Lasserre, T., Letourneau, A., Lhuillier, D., Litaize, O., de Marcillac, P., Marnieros, S., Martin, R., Materna, T., Mazzucato, E., Nones, C., Ortmann, T., Pattavina, L., Poda, D. V., Peters, L., Rothe, J., Schermer, N., Schieck, J., Schönert, S., Serot, O., Stodolsky, L., Strauss, R., Thulliez, L., Vignati, M., Vivier, M., Wagner, V., and Wex, A. more...
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Physics - Instrumentation and Detectors - Abstract
The emission of $\gamma$-rays after a neutron capture in a cryogenic detector can generate mono-energetic nuclear recoils in the sub-keV regime, of direct interest for the calibration of Dark Matter and Coherent Elastic Neutrino Nucleus Scattering experiments. Here we show that accurate predictions of the nuclear recoil spectra induced by neutron captures require taking into account the interplay between the development in time of the de-excitation $\gamma$-cascade of the target nucleus and that of the associated atomic collisions in matter. We present detailed simulations coupling the FIFRELIN code for the description of the $\gamma$-cascades and the IRADINA code for the modelling of the fast atomic movements in matter. Nuclear recoil spectra are predicted, and made available to the community, for concrete cases of Al$_2$O$_3$, Si, Ge and CaWO$_4$ crystals exposed to a low intensity beam of thermal neutrons. We find that timing effects cause new calibration peaks to emerge in the recoil spectra and also impact the shape of the continuous recoil distribution. We discuss how they could give access to a rich physics program, spanning the accurate study of the response of cryogenic detectors in the sub-keV range, tests of solid state physics simulations and tests of nuclear models. more...
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- 2023
4. Observation of a nuclear recoil peak at the 100 eV scale induced by neutron capture
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CRAB Collaboration, NUCLEUS Collaboration, Abele, H., Angloher, G., Bento, A., Canonica, L., Cappella, F., Cardani, L., Casali, N., Cerulli, R., Chalil, A., Chebboubi, A., Colantoni, I., Crocombette, J. -P., Cruciani, A., Del Castello, G., Roccagiovine, M. del Gallo, Desforge, D., Doblhammer, A., Dumonteil, E., Dorer, S., Erhart, A., Fuss, A., Friedl, M., Garai, A., Ghete, V. M., Giuliani, A., Goupy, C., Gunsing, F., Hauff, D., Jeanneau, F., Jericha, E., Kaznacheeva, M., Kinast, A., Kluck, H., Langenkämper, A., Lasserre, T., Letourneau, A., Lhuillier, D., Litaize, O., Mancuso, M., de Marcillac, P., Marnieros, S., Materna, T., Mauri, B., Mazzolari, A., Mazzucato, E., Neyrial, H., Nones, C., Oberauer, L., Ortmann, T., Ouzriat, A., Pattavina, L., Peters, L., Petricca, F., Poda, D. V., Potzel, W., Pröbst, F., Reindl, F., Rogly, R., Romagnoni, M., Rothe, J., Schermer, N., Schieck, J., Schönert, S., Schwertner, C., Scola, L., Serot, O., Soum-Sidikov, G., Stodolsky, L., Strauss, R., Tamisari, M., Thulliez, L., Tomei, C., Vignati, M., Vivier, M., Wagner, V., and Wex, A. more...
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Nuclear Experiment ,Physics - Instrumentation and Detectors - Abstract
Coherent elastic neutrino-nucleus scattering and low-mass Dark Matter detectors rely crucially on the understanding of their response to nuclear recoils. We report the first observation of a nuclear recoil peak at around 112 eV induced by neutron capture. The measurement was performed with a CaWO$_4$ cryogenic detector from the NUCLEUS experiment exposed to a $^{252}$Cf source placed in a compact moderator. The measured spectrum is found in agreement with simulations and the expected peak structure from the single-$\gamma$ de-excitation of $^{183}$W is identified with 3 $\sigma$ significance. This result demonstrates a new method for precise, in-situ, and non-intrusive calibration of low-threshold experiments. more...
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- 2022
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5. Calibration of nuclear recoils at the 100 eV scale using neutron capture
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Thulliez, L., Lhuillier, D., Cappella, F., Casali, N., Cerulli, R., Chalil, A., Chebboubi, A., Dumonteil, E., Erhart, A., Giuliani, A., Gunsing, F., Jericha, E., Kaznacheeva, M., Kinast, A., Langenkämper, A., Lasserre, T., Letourneau, A., Litaize, O., de Marcillac, P., Marnieros, S., Materna, T., Mauri, B., Mazzucato, E., Nones, C., Ortmann, T., Pattavina, L., Poda, D. V., Rogly, R., Schermer, N., Serot, O., Soum, G., Stodolsky, L., Strauss, R., Vignati, M., Vivier, M., Wagner, V., and Wex, A. more...
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Physics - Instrumentation and Detectors - Abstract
The development of low-threshold detectors for the study of coherent elastic neutrino-nucleus scattering and for the search for light dark matter necessitates methods of low-energy calibration. We suggest this can be provided by the nuclear recoils resulting from the $\gamma$ emission following thermal neutron capture. In particular, several MeV-scale single-$\gamma$ transitions induce well-defined nuclear recoil peaks in the 100 eV range. Using the FIFRELIN code, complete schemes of $\gamma$-cascades for various isotopes can be predicted with high accuracy to determine the continuous background of nuclear recoils below the calibration peaks. We present a comprehensive experimental concept for the calibration of CaWO$_4$ and Ge cryogenic detectors at a research reactor. For CaWO$_4$ the simulations show that two nuclear recoil peaks at 112.5 eV and 160.3 eV should be visible above background simply in the spectrum of the cryogenic detector. Then we discuss how the additional tagging for the associated $\gamma$ increases the sensitivity of the method and extends its application to a wider energy range and to Ge cryogenic detectors., Comment: 21 pages, 8 figures more...
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- 2020
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6. Study of the 238U(d,p) surrogate reaction via the simultaneous measurement of gamma-decay and fission probabilities
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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. more...
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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 more...
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- 2015
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7. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes
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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. more...
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- 2020
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8. This title is unavailable for guests, please login to see more information.
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Chevalier, A., Lecolley, F.-R., Lehaut, G., Lecouey, J.-L., Marie, N., Manduci, L., Ledoux, X., (0000-0003-2270-3623) Beyer, R., (0000-0001-7703-2471) Junghans, A., Bouland, O., Serot, O., Chevalier, A., Lecolley, F.-R., Lehaut, G., Lecouey, J.-L., Marie, N., Manduci, L., Ledoux, X., (0000-0003-2270-3623) Beyer, R., (0000-0001-7703-2471) Junghans, A., Bouland, O., and Serot, O. more...
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- 2024
9. Test of models for 235U(nth,f) charge distributions and their impacts on the covariance analysis
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Cheikh S.M., Kessedjian G., Serot O., Chebboubi A., and Litaize O.
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Physics ,QC1-999 - Abstract
Fission yields are of major interest for the nuclear industry and the study of the fission process. Fission yields are determined by evaluation process based on the analysis of experimental datasets and completed by phenomenological models. The aim is to provide the best estimation of independent yields of 235U(nth,f) reaction. In this paper, we will focus on the methodology of assessment of the nuclear charge distribution per mass. In the JEFF-3.1.1, the Wahl’s parametrization of the Zp-model is used to complete the experimental knowledge. Nevertheless, the lack of this parametrization consists in the absence of uncertainty information. Consequently, it is impossible to generate the components of independent yield correlation matrix from the Zp-model. In this context, we propose to use the Zp model with a new parametrization to assess the charge distributions. Two different calculations have been developed: the first one is based on a Wahl-like linear approximation of the parameters as a function of mass. The second approach consists to apply a “direct-Zp model” without linear assumptions. This analysis is achieved using the Markov-Chain Monte-Carlo (MCMC) method to adjust the model parameters and then to deduce the covariance of charge distributions. Moreover, with our development, we have directly and consistently described the pre-neutron and post-neutron charge distributions. more...
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- 2023
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10. New measurement of the 235U(nth,f) fission yields and development of a Time of Flight line at the LOHENGRIN spectrometer
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Houdouin-Quenault M., Sage C., Méplan O., Ramdhane M., Dauvergne D., Gallin-Martel M.L., Muraz J.F., Guillaudin O., Marcatili S., Kessedjian G., Chebboubi A., Serot O., Litaize O., Bernard D., Köster U., Kim Y.H., Mutti P., and Smith A.G. more...
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Physics ,QC1-999 - Abstract
The study of nuclear fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. In the framework of a collaboration between the CEA, the LPSC and the ILL, a program of actinide fission yield measurements has been ongoing for several years at the LOHENGRIN spectrometer. However, the measurement of very low fission yields in the symmetry region and the heavy wing of the distributions is difficult to achieve due to the strong contamination by other masses with much higher yields and requires the development of a new experimental setup. This paper will first present the results of a new absolute measurement of the 235U(nth,f) mass yields using an ionization chamber placed at the exit of the spectrometer. Although very well documented in the literature, these yields show uncertainties lying from 3% to 10% with large discrepancies between libraries and a lack of correlation matrices. New experimental data obtained at the LOHENGRIN spectrometer will be detailed, along with the measurement method and the production of the experimental covariance matrix. The second part will show the development of a Time of Flight (ToF) line in order to improve the background rejection in the mass yield measurements. In the symmetry region, the precision of the measurement is limited by the background estimation due to the charge exchanges with the residual gas of the separator. We plan to analyze the events using a triple coincidence (∆E x E) x ToF, whereas today only (∆E x E) selection is available. The new ToF line is built using Si3N4 foils and secondary electron detectors (SED) for the start and stop detectors. We will present the choices made for the SED technology along with the progress achieved on the ToF line characterization. more...
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- 2023
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11. Measurements of 233(nth,f)U233(nth,f) fission product mass yields with the LOHENGRIN recoil mass spectrometer
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Chebboubi, A., Kessedjian, G., Serot, O., Faust, H., Köster, U., Litaize, O., Sage, C., Blanc, A., Bernard, D., Letourneau, A., Materna, T., Méplan, O., Mutti, P., Rapala, M., and Ramdhane, M.
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- 2021
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12. beta-decay study of Cu-77
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Patronis, N., De Witte, H., Gorska, M., Huyse, M., Kruglov, K., Pauwels, D., Van de Vel, K., Van Duppen, P., Van Roosbroeck, J., Thomas, J. -C., Franchoo, S., Cederkall, J., Fedoseyev, V. N., Fynbo, H., Georg, U., Jonsson, O., Köster, U., Materna, T., Mathieu, L., Serot, O., Weissman, L., Mueller, W. F., Mishin, V. I., and Fedorov, D. more...
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Nuclear Experiment - Abstract
A beta-decay study of Cu-77 has been performed at the ISOLDE mass separator with the aim to deduce its beta-decay properties and to obtain spectroscopic information on Zn-77. Neutron-rich copper isotopes were produced by means of proton- or neutron-induced fission reactions on U-238. After the production, Cu-77 was selectively laser ionized, mass separated and sent to different detection systems where beta-gamma and beta-n coincidence data were collected. We report on the deduced half-live, decay scheme, and possible spin assignment of 77Cu. more...
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- 2009
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13. Observation of a Nuclear Recoil Peak at the 100 eV Scale Induced by Neutron Capture
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Abele, H, Angloher, G, Bento, A, Canonica, L, Cappella, F, Cardani, L, Casali, N, Cerulli, R, Chalil, A, Chebboubi, A, Colantoni, I, Crocombette, J, Cruciani, A, Del Castello, G, Del Gallo Roccagiovine, M, Desforge, D, Doblhammer, A, Dumonteil, E, Dorer, S, Erhart, A, Fuss, A, Friedl, M, Garai, A, Ghete, V, Giuliani, A, Goupy, C, Gunsing, F, Hauff, D, Jeanneau, F, Jericha, E, Kaznacheeva, M, Kinast, A, Kluck, H, Langenkamper, A, Lasserre, T, Letourneau, A, Lhuillier, D, Litaize, O, Mancuso, M, De Marcillac, P, Marnieros, S, Materna, T, Mauri, B, Mazzolari, A, Mazzucato, E, Neyrial, H, Nones, C, Oberauer, L, Ortmann, T, Ouzriat, A, Pattavina, L, Peters, L, Petricca, F, Poda, D, Potzel, W, Probst, F, Reindl, F, Rogly, R, Romagnoni, M, Rothe, J, Schermer, N, Schieck, J, Schonert, S, Schwertner, C, Scola, L, Serot, O, Soum-Sidikov, G, Stodolsky, L, Strauss, R, Tamisari, M, Thulliez, L, Tomei, C, Vignati, M, Vivier, M, Wagner, V, Wex, A, Abele H., Angloher G., Bento A., Canonica L., Cappella F., Cardani L., Casali N., Cerulli R., Chalil A., Chebboubi A., Colantoni I., Crocombette J. -P., Cruciani A., Del Castello G., Del Gallo Roccagiovine M., Desforge D., Doblhammer A., Dumonteil E., Dorer S., Erhart A., Fuss A., Friedl M., Garai A., Ghete V. M., Giuliani A., Goupy C., Gunsing F., Hauff D., Jeanneau F., Jericha E., Kaznacheeva M., Kinast A., Kluck H., Langenkamper A., Lasserre T., Letourneau A., Lhuillier D., Litaize O., Mancuso M., De Marcillac P., Marnieros S., Materna T., Mauri B., Mazzolari A., Mazzucato E., Neyrial H., Nones C., Oberauer L., Ortmann T., Ouzriat A., Pattavina L., Peters L., Petricca F., Poda D. V., Potzel W., Probst F., Reindl F., Rogly R., Romagnoni M., Rothe J., Schermer N., Schieck J., Schonert S., Schwertner C., Scola L., Serot O., Soum-Sidikov G., Stodolsky L., Strauss R., Tamisari M., Thulliez L., Tomei C., Vignati M., Vivier M., Wagner V., Wex A., Abele, H, Angloher, G, Bento, A, Canonica, L, Cappella, F, Cardani, L, Casali, N, Cerulli, R, Chalil, A, Chebboubi, A, Colantoni, I, Crocombette, J, Cruciani, A, Del Castello, G, Del Gallo Roccagiovine, M, Desforge, D, Doblhammer, A, Dumonteil, E, Dorer, S, Erhart, A, Fuss, A, Friedl, M, Garai, A, Ghete, V, Giuliani, A, Goupy, C, Gunsing, F, Hauff, D, Jeanneau, F, Jericha, E, Kaznacheeva, M, Kinast, A, Kluck, H, Langenkamper, A, Lasserre, T, Letourneau, A, Lhuillier, D, Litaize, O, Mancuso, M, De Marcillac, P, Marnieros, S, Materna, T, Mauri, B, Mazzolari, A, Mazzucato, E, Neyrial, H, Nones, C, Oberauer, L, Ortmann, T, Ouzriat, A, Pattavina, L, Peters, L, Petricca, F, Poda, D, Potzel, W, Probst, F, Reindl, F, Rogly, R, Romagnoni, M, Rothe, J, Schermer, N, Schieck, J, Schonert, S, Schwertner, C, Scola, L, Serot, O, Soum-Sidikov, G, Stodolsky, L, Strauss, R, Tamisari, M, Thulliez, L, Tomei, C, Vignati, M, Vivier, M, Wagner, V, Wex, A, Abele H., Angloher G., Bento A., Canonica L., Cappella F., Cardani L., Casali N., Cerulli R., Chalil A., Chebboubi A., Colantoni I., Crocombette J. -P., Cruciani A., Del Castello G., Del Gallo Roccagiovine M., Desforge D., Doblhammer A., Dumonteil E., Dorer S., Erhart A., Fuss A., Friedl M., Garai A., Ghete V. M., Giuliani A., Goupy C., Gunsing F., Hauff D., Jeanneau F., Jericha E., Kaznacheeva M., Kinast A., Kluck H., Langenkamper A., Lasserre T., Letourneau A., Lhuillier D., Litaize O., Mancuso M., De Marcillac P., Marnieros S., Materna T., Mauri B., Mazzolari A., Mazzucato E., Neyrial H., Nones C., Oberauer L., Ortmann T., Ouzriat A., Pattavina L., Peters L., Petricca F., Poda D. V., Potzel W., Probst F., Reindl F., Rogly R., Romagnoni M., Rothe J., Schermer N., Schieck J., Schonert S., Schwertner C., Scola L., Serot O., Soum-Sidikov G., Stodolsky L., Strauss R., Tamisari M., Thulliez L., Tomei C., Vignati M., Vivier M., Wagner V., and Wex A. more...
- Published
- 2023
14. This title is unavailable for guests, please login to see more information.
- Author
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Soum-Sidikov, G, Abele, H, Burkhart, J, Cappella, F, Casali, N, Cerulli, R, Chalil, A, Chebboubi, A, Crocombette, J, Del Castello, G, Del Gallo Roccagiovine, M, Doblhammer, A, Dorer, S, Erhart, A, Giuliani, A, Goupy, C, Gunsing, F, Jericha, E, Kaznacheeva, M, Kinast, A, Kluck, H, Langenkamper, A, Lasserre, T, Letourneau, A, Lhuillier, D, Litaize, O, De Marcillac, P, Marnieros, S, Martin, R, Materna, T, Mazzucato, E, Nones, C, Ortmann, T, Pattavina, L, Poda, D, Peters, L, Rothe, J, Schermer, N, Schieck, J, Schonert, S, Serot, O, Stodolsky, L, Strauss, R, Thulliez, L, Vignati, M, Vivier, M, Wagner, V, Wex, A, Soum-Sidikov G., Abele H., Burkhart J., Cappella F., Casali N., Cerulli R., Chalil A., Chebboubi A., Crocombette J. -P., Del Castello G., Del Gallo Roccagiovine M., Doblhammer A., Dorer S., Erhart A., Giuliani A., Goupy C., Gunsing F., Jericha E., Kaznacheeva M., Kinast A., Kluck H., Langenkamper A., Lasserre T., Letourneau A., Lhuillier D., Litaize O., De Marcillac P., Marnieros S., Martin R., Materna T., Mazzucato E., Nones C., Ortmann T., Pattavina L., Poda D. V., Peters L., Rothe J., Schermer N., Schieck J., Schonert S., Serot O., Stodolsky L., Strauss R., Thulliez L., Vignati M., Vivier M., Wagner V., Wex A., Soum-Sidikov, G, Abele, H, Burkhart, J, Cappella, F, Casali, N, Cerulli, R, Chalil, A, Chebboubi, A, Crocombette, J, Del Castello, G, Del Gallo Roccagiovine, M, Doblhammer, A, Dorer, S, Erhart, A, Giuliani, A, Goupy, C, Gunsing, F, Jericha, E, Kaznacheeva, M, Kinast, A, Kluck, H, Langenkamper, A, Lasserre, T, Letourneau, A, Lhuillier, D, Litaize, O, De Marcillac, P, Marnieros, S, Martin, R, Materna, T, Mazzucato, E, Nones, C, Ortmann, T, Pattavina, L, Poda, D, Peters, L, Rothe, J, Schermer, N, Schieck, J, Schonert, S, Serot, O, Stodolsky, L, Strauss, R, Thulliez, L, Vignati, M, Vivier, M, Wagner, V, Wex, A, Soum-Sidikov G., Abele H., Burkhart J., Cappella F., Casali N., Cerulli R., Chalil A., Chebboubi A., Crocombette J. -P., Del Castello G., Del Gallo Roccagiovine M., Doblhammer A., Dorer S., Erhart A., Giuliani A., Goupy C., Gunsing F., Jericha E., Kaznacheeva M., Kinast A., Kluck H., Langenkamper A., Lasserre T., Letourneau A., Lhuillier D., Litaize O., De Marcillac P., Marnieros S., Martin R., Materna T., Mazzucato E., Nones C., Ortmann T., Pattavina L., Poda D. V., Peters L., Rothe J., Schermer N., Schieck J., Schonert S., Serot O., Stodolsky L., Strauss R., Thulliez L., Vignati M., Vivier M., Wagner V., and Wex A. more...
- Published
- 2023
15. Emission of Scission Neutrons in the Sudden Approximation
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Carjan, N., Talou, P., and Serot, O.
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Nuclear Theory - Abstract
At a certain finite neck radius during the descent of a fissioning nucleus from the saddle to the scission point, the attractive nuclear forces can no more withstand the repulsive Coulomb forces producing the neck rupture and the sudden absorption of the neck stubs by the fragments. At that moment, the neutrons, although still characterized by their pre-scission wave functions, find themselves in the newly created potential of their interaction with the separated fragments. Their wave functions become wave packets with components in the continuum. The probability to populate such states gives evidently the emission probability of neutrons at scission. In this way, we have studied scission neutrons for the fissioning nucleus $^{236}$U, using two-dimensional realistic nuclear shapes. Both the emission probability and the distribution of the emission points relative to the fission fragments strongly depend on the quantum numbers of the pre-scission state from which the neutron is emitted. In particular it was found that states with $\Omega \pi$ = 1/2+ dominate the emission. Depending on the assumed pre- and post-scission configurations and on the emission-barrier height, 30 to 50% of the total scission neutrons are emitted from 1/2+ states. Their emission points are concentrated in the region between the newly separated fragments. The upper limit for the total number of neutrons per scission event is predicted to lie between 0.16 and 1.73 (depending on the computational assumptions)., Comment: 31 pages, 16 figures, 2 tables more...
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- 2007
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16. Fission yield covariance matrices for the main neutron-induced fissioning systems contained in the JEFF-3.1.1 library
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Terranova, N., Serot, O., Archier, P., De Saint Jean, C., and Sumini, M.
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- 2017
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17. Development of a Gas Filled Magnet spectrometer within the FIPPS project
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Chebboubi, A., Kessedjian, G., Faust, H., Blanc, A., Jentschel, M., Köster, U., Materna, T., Méplan, O., Sage, C., and Serot, O.
- Published
- 2016
- Full Text
- View/download PDF
18. An improved numerical method to compute neutron/gamma deexcitation cascades starting from a high spin state
- Author
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Regnier, D., Litaize, O., and Serot, O.
- Published
- 2016
- Full Text
- View/download PDF
19. Prompt Fission Neutron Spectra of Actinides
- Author
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Capote, R., Chen, Y.-J., Hambsch, F.-J., Kornilov, N.V., Lestone, J.P., Litaize, O., Morillon, B., Neudecker, D., Oberstedt, S., Ohsawa, T., Otuka, N., Pronyaev, V.G., Saxena, A., Serot, O., Shcherbakov, O.A., Shu, N.-C., Smith, D.L., Talou, P., Trkov, A., Tudora, A.C., Vogt, R., and Vorobyev, A.S. more...
- Published
- 2016
- Full Text
- View/download PDF
20. Study on Prompt Fission Neutron Spectra and Associated Covariances for 235U(nth,f) and 239Pu(nth,f)
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Berge, L., Litaize, O., Serot, O., Jean, C. De Saint, Archier, P., and Peneliau, Y.
- Published
- 2015
- Full Text
- View/download PDF
21. Covariance Matrix Evaluations for Independent Mass Fission Yields
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Terranova, N., Serot, O., Archier, P., De Saint Jean, C., and Sumini, M.
- Published
- 2015
- Full Text
- View/download PDF
22. Fission Mode Influence on Prompt Neutrons and γ-rays Emitted in the Reaction 239Pu(nth,f)
- Author
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Serot, O., Litaize, O., and Regnier, D.
- Published
- 2014
- Full Text
- View/download PDF
23. Preliminary results on the 233U α-ratio measurement at n_TOF
- Author
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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. more...
- 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. more...
- Published
- 2020
- Full Text
- View/download PDF
24. Measurements of Fission Products Yields with the LOHENGRIN mass spectrometer at ILL
- Author
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Chebboubi A., Julien-Laferrière S., Nicholson J., Kessedjian G., Serot O., Blanc A., Bernard D., Faust H., Kim Y.H., Köster U., Letourneau A., Litaize O., Méplan O., Mutti P., Rapala M., Ramdhane M., and Sage C. more...
- Subjects
Physics ,QC1-999 - Abstract
The CEA in collaboration with ILL and LPSC has developed a measurement program on symmetric and heavy mass fission product distributions. The combination of measurements with ionisation chamber and Ge detectors is necessary to describe precisely the heavy fission product region in mass and charge. Recently, new measurements of fission yields and kinetic energy distributions, for different fissioning systems (233,235 U(nth, f),241 Am(2nth, f) and 239,241 Pu(nth, f), were performed with recoil spectrometer LOHENGRIN. The focus has been done on the self-normalization of the data to provide new absolute measurements, independently of any libraries along with the experimental covariance matrix. To reach precise measurements, a new experimental procedure was developed along with a new analysis method. more...
- Published
- 2020
- Full Text
- View/download PDF
25. Fission fragments observables measured at the LOHENGRIN spectrometer
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Julien-Laferrière S., Thombansen L., Kessedjian G., Chebboubi A., Serot O., Sage C., Méplan O., Ramdhane M., Litaize O., Nicholson J., Bernard D., Köster U., Mutti P., Materna T., and Rapala M.
- Subjects
Physics ,QC1-999 - Abstract
Nuclear fission yields are key data for reactor studies, such as spent fuel inventory or decay heat, and for understanding fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the reduction of the uncertainties. Moreover, some discrepancies between these libraries must be explained. Additional measurements provide complementary information and estimations of experimental correlations, and new kinds of measurements enable to test the models used during the nuclear data evaluation process. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurements of isotopic and isobaric fission yields with the related variance-covariance matrices. Additionally, the experimental program involves a large range of observables requested by the evaluations, such as kinetic energy dependency of isotopic yields and odd-even effect in order to test the sharing of total excitation energy and the spin generation mechanism. Another example is the complete range of isotopic distribution per mass that allows the determination of the charge polarization, which has to be consistent for complementary masses (pre-neutron emission). For instance, this information is the key observable for the evaluation of isotopic yields. Finally, ionic charge distributions are indirect measurements of nanosecond isomeric ratios as a probe of the nuclear de-excitation path in the (E*, J, π) representation. Measurements for thermal neutron induced fission of 241 Pu have been carried out at the ILL in Grenoble, using the LOHENGRIN mass spectrometer. Methods, results and comparison to models calculations will be presented corresponding to a status on fission fragments observables reachable with this facility. more...
- Published
- 2020
- Full Text
- View/download PDF
26. New measurement of the 235U(nth,f) fission yields and development of a Time of Flight line at the LOHENGRIN spectrometer.
- Author
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Houdouin-Quenault, M., Sage, C., Méplan, O., Ramdhane, M., Dauvergne, D., Gallin-Martel, M.L., Muraz, J.F., Guillaudin, O., Marcatili, S., Kessedjian, G., Chebboubi, A., Serot, O., Litaize, O., Bernard, D., Köster, U., Kim, Y.H., Mutti, P., and Smith, A.G. more...
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NUCLEAR fission ,TIME-of-flight spectrometers ,NUCLEAR reactors ,ACTINIDE elements ,COVARIANCE matrices - Abstract
The study of nuclear fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. In the framework of a collaboration between the CEA, the LPSC and the ILL, a program of actinide fission yield measurements has been ongoing for several years at the LOHENGRIN spectrometer. However, the measurement of very low fission yields in the symmetry region and the heavy wing of the distributions is difficult to achieve due to the strong contamination by other masses with much higher yields and requires the development of a new experimental setup. This paper will first present the results of a new absolute measurement of the
235 U(nth ,f) mass yields using an ionization chamber placed at the exit of the spectrometer. Although very well documented in the literature, these yields show uncertainties lying from 3% to 10% with large discrepancies between libraries and a lack of correlation matrices. New experimental data obtained at the LOHENGRIN spectrometer will be detailed, along with the measurement method and the production of the experimental covariance matrix. The second part will show the development of a Time of Flight (ToF) line in order to improve the background rejection in the mass yield measurements. In the symmetry region, the precision of the measurement is limited by the background estimation due to the charge exchanges with the residual gas of the separator. We plan to analyze the events using a triple coincidence (∆E x E) x ToF, whereas today only (∆E x E) selection is available. The new ToF line is built using Si3 N4 foils and secondary electron detectors (SED) for the start and stop detectors. We will present the choices made for the SED technology along with the progress achieved on the ToF line characterization. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
- Full Text
- View/download PDF
27. Test of models for 235U(nth,f) charge distributions and their impacts on the covariance analysis.
- Author
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Cheikh, S.M., Kessedjian, G., Serot, O., Chebboubi, A., and Litaize, O.
- Subjects
NUCLEAR fission ,NUCLEAR charge ,MARKOV chain Monte Carlo ,NUCLEAR industry ,NEUTRON multiplicity - Abstract
Fission yields are of major interest for the nuclear industry and the study of the fission process. Fission yields are determined by evaluation process based on the analysis of experimental datasets and completed by phenomenological models. The aim is to provide the best estimation of independent yields of
235 U(nth ,f) reaction. In this paper, we will focus on the methodology of assessment of the nuclear charge distribution per mass. In the JEFF-3.1.1, the Wahl's parametrization of the Zp -model is used to complete the experimental knowledge. Nevertheless, the lack of this parametrization consists in the absence of uncertainty information. Consequently, it is impossible to generate the components of independent yield correlation matrix from the Zp -model. In this context, we propose to use the Zp model with a new parametrization to assess the charge distributions. Two different calculations have been developed: the first one is based on a Wahl-like linear approximation of the parameters as a function of mass. The second approach consists to apply a "direct-Zp model" without linear assumptions. This analysis is achieved using the Markov-Chain Monte-Carlo (MCMC) method to adjust the model parameters and then to deduce the covariance of charge distributions. Moreover, with our development, we have directly and consistently described the pre-neutron and post-neutron charge distributions. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
- Full Text
- View/download PDF
28. From low- to high-energy nuclear data evaluations: Issues and perspectives on nuclear reaction models and covariances
- Author
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Tamagno, P., De Saint Jean, C., Bouland, O., Noguère, G., Archier, P., Privas, E., and Serot, O.
- Published
- 2015
- Full Text
- View/download PDF
29. Monte Carlo Simulation of Prompt Fission Gamma Emission
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Regnier, D., Litaize, O., and Serot, O.
- Published
- 2012
- Full Text
- View/download PDF
30. Preliminary results on the 233U capture cross section and alpha ratio measured at n_TOF (CERN) with the fission tagging technique
- Author
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Bacak M., Aiche M., Bélier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Laurent B., Leeb H., Mathieu L., Schillebeeckx P., Serot O., Taieb J., Vlachoudis V., Aberle O., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Bečvář F., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Domingo-Pardo C., Dressler R., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Göbel K., García A. R., Gawlik A., Gilardoni S., Glodariu T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D. G., Jericha E., Käppeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krtička M., Kurtulgil D., Leal-Cidoncha E., Lederer C., Lerendegui-Marco J., Meo S. Lo, Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Milazzo P. M., Mingrone F., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J. M., Radeck D., Rauscher T., Reifarth R., Rubbia C., Ryan J. A., Sabaté-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A., Tassan-Got L., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlastou R., Wallner A., Warren S., Weiss C., Woods P. J., Wright T., and Žugec P. more...
- Subjects
Physics ,QC1-999 - Abstract
233U is of key importance among the fissile nuclei in the Th-U fuel cycle. A particularity of 233U is its small neutron capture cross-section, which is on average about one order of magnitude lower than the fission cross-section. The accuracy in the measurement of the 233U capture cross-section depends crucially on an efficient capture-fission discrimination, thus a combined set-up of fission and γ-detectors is needed. A measurement of the 233U capture cross-section and capture-to-fission ratio was performed at the CERN n_TOF facility. The Total Absorption Calorimeter (TAC) of n_TOF was employed as γ-detector coupled with a novel compact ionization chamber as fission detector. A brief description of the experimental set-up will be given, and essential parts of the analysis procedure as well as the preliminary response of the set-up to capture are presented and discussed. more...
- Published
- 2019
- Full Text
- View/download PDF
31. Preface
- Author
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Serot O. and Chebboubi A.
- Subjects
Physics ,QC1-999 - Published
- 2019
- Full Text
- View/download PDF
32. Status of fission fragment observables measured with the LOHENGRIN spectrometer
- Author
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Julien-Laferrière S., Thombansen L., Kessedjian G., Chebboubi A., Serot O., Sage C., Méplan O., Ramdhane M., Litaize O., Bernard D., Nicholson J., Blanc A., Faust H., Mutti P., Köster U., Letourneau A., Materna T., and Rapala M. more...
- Subjects
Physics ,QC1-999 - Abstract
Nuclear fission yields are key parameters to evaluate reactor physics observables, such as fuel inventory, decay heat, spent fuel radiotoxicity, criticality but also for understanding the fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the description of the uncertainties with the associated correlations. Additional kinds of measurements provide complementary information in order to test the models used in the nuclear data evaluation. Moreover, some discrepancies between these libraries must be explained. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurement of isotopic and isobaric fission yields with the related variance-covariance matrices. Nevertheless, the experimental program represents itself a large range of observables requested by the evaluations: isotopic yields, nuclear charge polarization, odd-even effect, isomeric ratio and their dependency with fission fragment kinetic energy as a probe of the nuclear de-excitation path in the (E*, Jπ) representation. Measurements for thermal neutron induced fission of 241Pu have been carried out at the Institut Laue Langevin using the LOHENGRIN mass spectrometer. Experimental program, observables reachable, results and comparison to model calculations are shown. more...
- Published
- 2019
- Full Text
- View/download PDF
33. Study of the photon strength functions and level density in the gamma decay of the n + 234U reaction
- Author
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Moreno-Soto J., Berthoumieux E, Dupont E, Gunsing F, Serot O, Litaize O, Diakaki M, Chebboubi A, Dridi W, Valenta S, Krtiˇcka M., Aberle O, Alcayne V, Andrzejewski J, Audouin L, Bécares V., Babiano-Suarez V., Bacak M, Barbagallo M, Benedikt Th, Bennett S, Billowes J, Bosnar D, Brown A, Busso M, Caamaño M., Caballero-Ontanaya L., Calviño F., Calviani M, Cano-Ott D., Casanovas A, Cerutti F, Chiaveri E, Colonna N, Cortés G., Cortés-Giraldo M. A., Cosentino L, Cristallo S, Damone L. A, Davies P. J, Dietz M, Domingo-Pardo C., Dressler R, Ducasse Q, Durán I., Eleme Z, Fernández-Domínguez B., Ferrari A, Finocchiaro P, Furman V, Göbel K., Gawlik A, Gilardoni S, Gonçalves I. F., González-Romero E., Guerrero C, Heinitz S, Heyse J, Jenkins D. G, Junghans A, Käppeler F., Kadi Y, Kimura A, Knapova I, Kokkoris M, Kopatch Y, Kurtulgil D, Ladarescu I, Lederer-Woods C., Lonsdale S. J, Macina D, Manna A, Martínez T., Masi A, Massimi C, Mastinu P, Mastromarco M, Maugeri E. A, Mazzone A, Mendoza E, Mengoni A, Michalopoulou V, Milazzo P. M, Mingrone F, Musumarra A, Negret A, Ogállar F., Oprea A, Patronis N, Pavlik A, Perkowski J, Persanti L, Petrone C, Pirovano E, Porras I, Praena J, Quesada J. M, Ramos-Doval D., Rauscher T, Reifarth R, Rochman D, Sabaté-Gilarte M., Saxena A, Schillebeeckx P, Schumann D, Sekhar A, Simone S, Smith A. G, Sosnin N. V, Sprung P, Stamatopoulos A, Tagliente G, Tain J. L, Tarifeño-Saldivia A., Tassan-Got L., Tsinganis A, Ulrich J, Urlass S, Vannini G, Variale V, Vaz P, Ventura A, Vescovi D, Vlachoudis V, Vlastou R, Wallner A, Woods P. J, Wright T, and Žugec P. more...
- Subjects
Physics ,QC1-999 - Abstract
The accurate calculations of neutron-induced reaction cross sections are relevant for many nuclear applications. The photon strength functions and nuclear level densities are essential inputs for such calculations. These quantities for 235U are studied using the measurement of the gamma de-excitation cascades in radiative capture on 234U with the Total Absorption Calorimeter at n_TOF at CERN. This segmented 4π gamma calorimeter is designed to detect gamma rays emitted from the nucleus with high efficiency. This experiment provides information on gamma multiplicity and gamma spectra that can be compared with numerical simulations. The code DICEBOXC is used to simulate the gamma cascades while GEANT4 is used for the simulation of the interaction of these gammas with the TAC materials. Available models and their parameters are being tested using the present data. Some preliminary results of this ongoing study are presented and discussed. more...
- Published
- 2019
- Full Text
- View/download PDF
34. Constraints on the dipole photon strength for the odd uranium isotopes
- Author
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Moreno-Soto, J., Valenta, S., Berthoumieux, E., Chebboubi, A., Diakaki, M., Dridi, W., Dupont, E., Gunsing, F., Krticka, M., Litaize, O., Serot, O., Aberle, O., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Bécares, V., Babiano-Suarez, V., Bacak, M., Barbagallo, M., Benedikt, T., Bennett, S., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caamaño, M., Caballero-Ontanaya, L., Calviño, F., Calviani, M., Cano-Ott, D., Casanovas, A., Cerutti, F., Chiaveri, E., Colonna, N., Cortés, G., Cortés-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Dietz, M., Domingo-Pardo, C., Dressler, R., Ducasse, Q., Durán, I., Eleme, Z., Fernández-Domínguez, B., Ferrari, A., Finocchiaro, P., Furman, V., Göbel, K., Gawlik-Ramiga, A., Gilardoni, S., Gonçalves, I. F., González-Romero, E., Guerrero, C., Heinitz, S., Heyse, J., Jenkins, D. G., Junghans, A., Käppeler, F., Kadi, Y., Kimura, A., Knapová, I., Kokkoris, M., Kopatch, Y., Kurtulgil, D., Ladarescu, I., Lampoudis, C., Lederer-Woods, C., Lonsdale, S. J., Macina, D., Manna, A., Martínez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Ogállar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Piersanti, L., Petrone, C., Pirovano, E., Porras, I., Praena, J., Quesada, J. M., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, A. G., Sosnin, N. V., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeño-Saldivia, A., Tassan-Got, L., Torres-Sánchez, P., Tsinganis, A., Ulrich, J., Urlass, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T., Žugec, P., Moreno-Soto, J., Valenta, S., Berthoumieux, E., Chebboubi, A., Diakaki, M., Dridi, W., Dupont, E., Gunsing, F., Krticka, M., Litaize, O., Serot, O., Aberle, O., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Bécares, V., Babiano-Suarez, V., Bacak, M., Barbagallo, M., Benedikt, T., Bennett, S., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caamaño, M., Caballero-Ontanaya, L., Calviño, F., Calviani, M., Cano-Ott, D., Casanovas, A., Cerutti, F., Chiaveri, E., Colonna, N., Cortés, G., Cortés-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Dietz, M., Domingo-Pardo, C., Dressler, R., Ducasse, Q., Durán, I., Eleme, Z., Fernández-Domínguez, B., Ferrari, A., Finocchiaro, P., Furman, V., Göbel, K., Gawlik-Ramiga, A., Gilardoni, S., Gonçalves, I. F., González-Romero, E., Guerrero, C., Heinitz, S., Heyse, J., Jenkins, D. G., Junghans, A., Käppeler, F., Kadi, Y., Kimura, A., Knapová, I., Kokkoris, M., Kopatch, Y., Kurtulgil, D., Ladarescu, I., Lampoudis, C., Lederer-Woods, C., Lonsdale, S. J., Macina, D., Manna, A., Martínez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Ogállar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Piersanti, L., Petrone, C., Pirovano, E., Porras, I., Praena, J., Quesada, J. M., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, A. G., Sosnin, N. V., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeño-Saldivia, A., Tassan-Got, L., Torres-Sánchez, P., Tsinganis, A., Ulrich, J., Urlass, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T., and Žugec, P. more...
- Published
- 2022
35. Constraints on the dipole photon strength for the odd uranium isotopes
- Author
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N_TOF Collaboration, Moreno-Soto, J., Valenta, S., Berthoumieux, E., Chebboubi, A., Diakaki, M., Dridi, W., Dupont, E., Gunsing, F., Krticka, M., Litaize, O., Serot, O., Aberle, O., Alcayne, V., Amaducci, S., Andrzejewski, J., Audouin, L., Bécares, V., Babiano-Suarez, V., Bacak, M., Barbagallo, M., Benedikt, T., Bennett, S., Billowes, J., Bosnar, D., Brown, A., Busso, M., Caamaño, M., Caballero-Ontanaya, L., Calviño, F., Calviani, M., Cano-Ott, D., Casanovas, A., Cerutti, F., Chiaveri, E., Colonna, N., Cortés, G., Cortés-Giraldo, M. A., Cosentino, L., Cristallo, S., Damone, L. A., Davies, P. J., Dietz, M., Domingo-Pardo, C., Dressler, R., Ducasse, Q., Durán, I., Eleme, Z., Fernández-Domínguez, B., Ferrari, A., Finocchiaro, P., Furman, V., Göbel, K., Gawlik-Ramiga, A., Gilardoni, S., Gonçalves, I. F., González-Romero, E., Guerrero, C., Heinitz, S., Heyse, J., Jenkins, D. G., Junghans, A., Käppeler, F., Kadi, Y., Kimura, A., Knapová, I., Kokkoris, M., Kopatch, Y., Kurtulgil, D., Ladarescu, I., Lampoudis, C., Lederer-Woods, C., Lonsdale, S. J., Macina, D., Manna, A., Martínez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Michalopoulou, V., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Ogállar, F., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Piersanti, L., Petrone, C., Pirovano, E., Porras, I., Praena, J., Quesada, J. M., Ramos-Doval, D., Rauscher, T., Reifarth, R., Rochman, D., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schumann, D., Sekhar, A., Smith, A. G., Sosnin, N. V., Sprung, P., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeño-Saldivia, A., Tassan-Got, L., Torres-Sánchez, P., Tsinganis, A., Ulrich, J., Urlass, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vescovi, D., Vlachoudis, V., Vlastou, R., Wallner, A., Woods, P. J., Wright, T., and Žugec, P. more...
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Physics ,ddc:530 ,Nuclear Experiment - Abstract
Background: The photon strength functions (PSFs) and nuclear level density (NLD) are key ingredients for calculation of the photon interaction with nuclei, in particular the reaction cross sections. These cross sections are important especially in nuclear astrophysics and in the development of advanced nuclear technologies. Purpose: The role of the scissors mode in the M1 PSF of (well-deformed) actinides was investigated by several experimental techniques. The analyses of different experiments result in significant differences, especially on the strength of the mode. The shape of the low-energy tail of the giant electric dipole resonance is uncertain as well. In particular, some works proposed a presence of the E1 pygmy resonance just above 7 MeV. Because of these inconsistencies additional information on PSFs in this region is of great interest. Methods: The γ-ray spectra from neutron-capture reactions on the $^{234}$U, $^{236}$U, and $^{238}$U nuclei have been measured with the total absorption calorimeter of the n_TOF facility at CERN. The background-corrected sum-energy and multi-step-cascade spectra were extracted for several isolated s-wave resonances up to about 140 eV. Results: The experimental spectra were compared to statistical model predictions coming from a large selection of models of photon strength functions and nuclear level density. No combination of PSF and NLD models from literature is able to globally describe our spectra. After extensive search we were able to find model combinations with modified generalized Lorentzian (MGLO) E1 PSF, which match the experimental spectra as well as the total radiative widths. Conclusions: The constant temperature energy dependence is favored for a NLD. The tail of giant electric dipole resonance is well described by the MGLO model of the E1 PSF with no hint of pygmy resonance. The M1 PSF must contain a very strong, relatively wide, and likely double-resonance scissors mode. The mode is responsible for about a half of the total radiative width of neutron resonances and significantly affects the radiative cross section. more...
- Published
- 2022
36. Measurements of $$^{233}$$U$$(\text {n}_{\text {th}},\text {f})$$ fission product mass yields with the LOHENGRIN recoil mass spectrometer
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Chebboubi, A., primary, Kessedjian, G., additional, Serot, O., additional, Faust, H., additional, Köster, U., additional, Litaize, O., additional, Sage, C., additional, Blanc, A., additional, Bernard, D., additional, Letourneau, A., additional, Materna, T., additional, Méplan, O., additional, Mutti, P., additional, Rapala, M., additional, and Ramdhane, M., additional more...
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- 2021
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37. Isotopic distribution and dependency to fission product kinetic energy for 241Pu thermal neutron-induced fission
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Julien-Laferrière S., Kessedjian G., Serot O., Chebboubi A., Bernard D., Blanc A., Köster U., Litaize O., Materna T., Meplan O., Rapala M., and Sage C.
- Subjects
Physics ,QC1-999 - Abstract
Nuclear fission yields data measurements for thermal neutron induced fission of 241Pu have been carried out at the ILL in Grenoble, using the Lohengrin mass spectrometer. The relative isotopic yields for the masses 137 up to 141 have been derived with the associated experimental covariance matrices. Moreover, from preliminary results for the masses 92, 138 and 139, a clear evolution over fission product kinetic energy of the isotopic total count rate is observed. more...
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- 2018
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38. Studies of fission fragment yields via high-resolution γ-ray spectroscopy
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Wilson J.N., Lebois M., Qi L., Amador-Celdran P, Bleuel D., Briz J.A., Carroll R., Catford W., Witte H. De, Doherty D.T., Eloirdi R., Georgiev G., Gottardo A., Goasduff A., Hadyñska-Klek K., Hauschild K., Hess H., Ingeberg V., Konstantinopoulos T., Ljungvall J., Lopez-Martens A., Lorusso G., Lozeva R., Lutter R., Marini P., Matea I., Materna T., Mathieu L., Oberstedt A., Oberstedt S., Panebianco S., Podolyak Zs., Porta A., Regan P.H., Reiter P., Rezynkina K., Rose S.J., Sahin E., Seidlitz M., Serot O., Shearman R., Siebeck B., Siem S., Smith A.G., Tveten G.M., Verney D., Warr N., Zeiser F., and Zielinska M. more...
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Physics ,QC1-999 - Abstract
Precise spectroscopic information on the fast neutron induced fission of the 238U(n,f) reaction was recently gained using a new technique which involved coupling of the Miniball high resolution y-ray spectrometer and the LICORNE directional neutron source. The experiment allowed measurement of the isotopic fission yields for around 40 even-even nuclei at an incident neutron energy of around 2 MeV where yield data are very sparse. In addition spectroscopic information on very neutron-rich fission products was obtained. Results were compared to models, both the JEFF-3.1.1 data base and the GEF code, and large discrepancies for the S1 fission mode in the Sn/Mo isotope pair were discovered. This suggests that current models are overestimating the role played by spherical shell effects in fast neutron induced fission. In late 2017 and 2018 the nu-ball hybrid spectrometer will be constructed at the IPN Orsay to perform further experimental investigations with directional neutrons coupled to a powerful hybrid Ge/LaBr3 detector array. This will open up new possibilities for measurements of fission yields for fast-neutron-induced fission using the spectroscopic technique and will be complimentary to other methods being developed. more...
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- 2018
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39. A Photofission Delayed γ-ray Spectra Calculation Tool for the Conception of a Nuclear Material Characterization Facility
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BERNARD D., SEROT O., SIMON E., BOUCHER L., and PLUMERI S.
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Photonic Interrogation ,Nuclear Material Characterization ,Photofission Yields ,Delayed γ ,Decay Data ,Physics ,QC1-999 - Abstract
The photon interrogation analysis is a nondestructive technique allowing to identify and quantify fissile materials in nuclear waste packages. This paper details an automatic procedure which has been developed to simulate the delayed γ-ray spectra for several actinide photofissions. This calculation tool will be helpful for the fine conception (collimation, shielding, noise background optimizations, etc.) and for the on-line analysis of such a facility. more...
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- 2018
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40. Time-dependent Schrödinger approach to sub-barrier fission
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Carjan, N., Serot, O., Strottman, D., Anagnostatos, G. S., editor, and von Oertzen, W., editor
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- 1995
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41. 237Np absolute delayed neutron yield measurements
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Doré D., Ledoux X., Nolte R., Gagnon-Moisan F., Thulliez L., Litaize O., Roettger S., and Serot O.
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Physics ,QC1-999 - Abstract
237Np absolute delayed neutron yields have been measured at different incident neutron energies from 1.5 to 16 MeV. The experiment was performed at the Physikalisch-Technische Bundesanstalt (PTB) facility where the Van de Graaff accelerator and the cyclotron CV28 delivered 9 different neutron energy beams using p+T, d+D and d+T reactions. The detection system is made up of twelve 3He tubes inserted into a polyethylene cylinder. In this paper, the experimental setup and the data analysis method are described. The evolution of the absolute DN yields as a function of the neutron incident beam energies are presented and compared to experimental data found in the literature and data from the libraries. more...
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- 2017
- Full Text
- View/download PDF
42. Measurements of $^{233}$U$(\text {n}_{\text {th}},\text {f})$ fission product mass yields with the LOHENGRIN recoil mass spectrometer
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Chebboubi, A., Kessedjian, G., Serot, O., Faust, H., Köster, U., Litaize, O., Sage, C., Blanc, A., Bernard, D., Letourneau, A., Materna, T., Méplan, O., Mutti, P., Rapala, M., Ramdhane, M., 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), Institut Laue-Langevin (ILL), ILL, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay more...
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Nuclear and High Energy Physics ,010308 nuclear & particles physics ,0103 physical sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,010306 general physics ,Nuclear Experiment ,01 natural sciences ,7. Clean energy - Abstract
International audience; Numerous measurements of fission product yields were performed since the discovery of the nuclear fission process. However, more precise and reliable fission product yields are requested. Lack of covariance matrices make difficult to use it for specific application purposes such as the propagation uncertainty of decay heat. In this work, we propose to measure independently the fission product mass yields for the whole heavy peak (including the symmetric mass region) for the $^{233}$U$(\text {n}_{\text {th}},\text {f})$ reaction. Both average values and experimental covariance is provided. The fission product mass yields are measured with the LOHENGRIN recoil mass spectrometer of the ILL using an ionization chamber located at the focal plane. A new procedure of data taking has been developed in order to minimize the biases. Concretely several ionic charges and kinetic energy distributions have been measured for each mass. Particular attention has been considered in the monitoring of the target time evolution. Additional corrections were necessary in the symmetry mass region due to contaminants coming from the LOHENGRIN recoil mass spectrometer. A complex Monte Carlo analysis has been developed in order to better propagate all the uncertainties. The fission product mass yields of the $^{233}$U$(\text {n}_{\text {th}},\text {f})$ and its associated covariance matrix has been produced. An overall good agreement has been observed with ENDF/B-VIII.0 in contrast with the JEFF-3.3 evaluation. A precision around 2% for the heavy peak has been measured. The experimental covariance matrix was also computed. In the symmetry mass region, two components were observed in the kinetic energy distribution. One of this component was considered as an artifact and was ruled-out. more...
- Published
- 2021
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43. Investigation of fission product isomeric ratios and angular momenta of 132Sn populated in the 241Pu(nth,f) reaction
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Nicholson, J., Chebboubi, A., Serot, O., Kessedjian, G., Kim, Y.H., Köster, U., Litaize, O., Méplan, O., Sage, C., Ramdhane, M., 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), and Institut Laue-Langevin (ILL) more...
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Physics ,QC1-999 ,Physics::Atomic and Molecular Clusters ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment - Abstract
During an experimental campaign performed at the LOHENGRIN recoil spectrometer of the Institut Laue-Langevin (ILL), a kinetic energy dependence of 132Sn fission product isomeric ratio (IR) has been measured by inducing thermal fission of 241Pu. The IRs are deduced using gamma ray spectrometry in coincidence with the ionisation chamber. To interpret these data, we use the FIFRELIN Monte-Carlo code to simulate the de-excitation of the fission fragments. Combining the IRs with the FIFRELIN calculations, the angular momentum distribution with kinetic energy of the doubly magic nucleus of 132Sn was deduced. This will be compared with the angular momentum distribution obtained for the reaction 235U(nth,f) for 132Sn. more...
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- 2021
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- View/download PDF
44. Calibration of nuclear recoils at the 100 eV scale using neutron capture
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Thulliez, L., primary, Lhuillier, D., additional, Cappella, F., additional, Casali, N., additional, Cerulli, R., additional, Chalil, A., additional, Chebboubi, A., additional, Dumonteil, E., additional, Erhart, A., additional, Giuliani, A., additional, Gunsing, F., additional, Jericha, E., additional, Kaznacheeva, M., additional, Kinast, A., additional, Langenkämper, A., additional, Lasserre, T., additional, Letourneau, A., additional, Litaize, O., additional, de Marcillac, P., additional, Marnieros, S., additional, Materna, T., additional, Mauri, B., additional, Mazzucato, E., additional, Nones, C., additional, Ortmann, T., additional, Pattavina, L., additional, Poda, D.V., additional, Rogly, R., additional, Schermer, N., additional, Serot, O., additional, Soum, G., additional, Stodolsky, L., additional, Strauss, R., additional, Vignati, M., additional, Vivier, M., additional, Wagner, V., additional, and Wex, A., additional more...
- Published
- 2021
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45. First simultaneous measurement of fission and gamma probabilities of 237U and 239Np via surrogate reactions
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Marini P., Ducasse Q., Jurado B., Aiche M., Mathieu L., Barreau G., Czajkowski S., Tsekhanovich I., Moro A., Lei J., Giacoppo F., Gorgen A., Tornyi, Audouin L., Tassan-Got L., Wilson J. N., Gunsing F., Guttormsen M., Larsen A. C., Lebois M., Renstrom T., Rose S., Siem S., Tveten G. M., Wiedeking M., Serot O., Boutoux G., Méot V., Morillon B., Denis-Petit D., Roig O., Oberstedt S., and Oberstedt A. more...
- Subjects
Physics ,QC1-999 - Abstract
Fission and gamma decay probabilities of 237U and 239Np have been measured, for the first time simultaneously in dedicated experiments, via the surrogate reactions 238U(3He, 4He) and 238U(3He,d), respectively. While a good agreement between our data and neutron-induced data is found for fission probabilities, gamma decay probabilities are several times higher than the corresponding neutron-induced data for each studied nucleus. We study the role of the different spin distributions populated in the surrogate and neutron-induced reactions. The compound nucleus spin distribution populated in the surrogate reaction is extracted from the measured gamma-decay probabilities, and used as input parameter in the statistical model to predict fission probabilities to be compared to our data. A strong disagreement between our data and the prediction is obtained. Preliminary results from an additional dedicated experiment confirm the observed discrepancies, indicating the need of a better understanding of the formation and decay processes of the compound nucleus. more...
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- 2016
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- View/download PDF
46. A Covariance Generation Methodology for Fission Product Yields
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Terranova N., Serot O., Archier P., Vallet V., De Saint Jean C., and Sumini M.
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Physics ,QC1-999 - Abstract
Recent safety and economical concerns for modern nuclear reactor applications have fed an outstanding interest in basic nuclear data evaluation improvement and completion. It has been immediately clear that the accuracy of our predictive simulation models was strongly affected by our knowledge on input data. Therefore strong efforts have been made to improve nuclear data and to generate complete and reliable uncertainty information able to yield proper uncertainty propagation on integral reactor parameters. Since in modern nuclear data banks (such as JEFF-3.1.1 and ENDF/BVII.1) no correlations for fission yields are given, in the present work we propose a covariance generation methodology for fission product yields. The main goal is to reproduce the existing European library and to add covariance information to allow proper uncertainty propagation in depletion and decay heat calculations. To do so, we adopted the Generalized Least Square Method (GLSM) implemented in CONRAD (COde for Nuclear Reaction Analysis and Data assimilation), developed at CEA-Cadarache. Theoretical values employed in the Bayesian parameter adjustment are delivered thanks to a convolution of different models, representing several quantities in fission yield calculations: the Brosa fission modes for pre-neutron mass distribution, a simplified Gaussian model for prompt neutron emission probability, theWahl systematics for charge distribution and the Madland-England model for the isomeric ratio. Some results will be presented for the thermal fission of U-235, Pu-239 and Pu-241. more...
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- 2016
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- View/download PDF
47. Sensitivity studies of spin cut-off models on fission fragment observables
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Thulliez L., Litaize O., and Serot O.
- Subjects
Physics ,QC1-999 - Abstract
A fission fragment de-excitation code, FIFRELIN, is being developed at CEA Cadarache. It allows probing the characteristics of the prompt emitted particles, neutrons and gammas, during the de-excitation process of fully accelerated fission fragments. The knowledge of the initial states of the fragments is important to accurately reproduce the fission fragment observables. In this paper a sensitivity study of various spin cut-off models, completely defining the initial fission fragment angular momentum distribution has been performed. This study shows that the choice of the model has a significant impact on gamma observables such as spectrum and multiplicity and almost none on the neutron observables. more...
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- 2016
- Full Text
- View/download PDF
48. Isomeric ratio measurements with the ILL LOHENGRIN spectrometer
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Chebboubi A., Kessedjian G., Litaize O., Serot O., Faust H., Bernard D., Blanc A., Köster U., Méplan O., Mutti P., and Sage C.
- Subjects
Physics ,QC1-999 - Abstract
The modelling of γ heating and neutron damage inside a nuclear reactor is essential to design the next generation of nuclear reactors. The determination of the fission fragment momentum is a key element to perform accurate calculations of the γ heating. One way to assess this information is to look at the isomeric ratio of different nuclei. According to the lifetime of the isomeric state, different experimental techniques were developed at the LOHENGRIN spectrometer. A focus on the measurement of isomeric ratios of 136I in neutron induced fission of 241Pu is presented. A discussion with the current assumptions used in the evaluation process for isomeric ratio is also shown. more...
- Published
- 2016
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- View/download PDF
49. Preface
- Author
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Serot O.
- Subjects
Physics ,QC1-999 - Published
- 2016
- Full Text
- View/download PDF
50. 233U mass yield measurements around and within the symmetry region with the ILL Lohengrin spectrometer
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Chebboubi A., Kessedjian G., Sage C., Bernard D., Blanc A., Faust H., Köster U., Litaize O., Mutti P., and Serot O.
- Subjects
Physics ,QC1-999 - Abstract
The study of fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. The LPSC in collaboration with ILL and CEA has developed a measurement program on fission fragment distributions at the Lohengrin spectrometer of the ILL, with a special focus on the masses constituting the heavy peak. We will present in this paper our measurement of the very low fission yields in the symmetry mass region and the heavy mass wing of the distribution for 233U thermal neutron induced fission. The difficulty due to the strong contamination by other masses with much higher yields will be addressed in the form of a new analysis method featuring the required contaminant correction. The apparition of structures in the kinetic energy distributions and possible interpretations will be discussed, such as a possible evidence of fission modes. more...
- Published
- 2016
- Full Text
- View/download PDF
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