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Wilson JN, Thisse D, Lebois M, Jovančević N, Gjestvang D, Canavan R, Rudigier M, Étasse D, Gerst RB, Gaudefroy L, Adamska E, Adsley P, Algora A, Babo M, Belvedere K, Benito J, Benzoni G, Blazhev A, Boso A, Bottoni S, Bunce M, Chakma R, Cieplicka-Oryńczak N, Courtin S, Cortés ML, Davies P, Delafosse C, Fallot M, Fornal B, Fraile L, Gottardo A, Guadilla V, Häfner G, Hauschild K, Heine M, Henrich C, Homm I, Ibrahim F, Iskra ŁW, Ivanov P, Jazrawi S, Korgul A, Koseoglou P, Kröll T, Kurtukian-Nieto T, Le Meur L, Leoni S, Ljungvall J, Lopez-Martens A, Lozeva R, Matea I, Miernik K, Nemer J, Oberstedt S, Paulsen W, Piersa M, Popovitch Y, Porzio C, Qi L, Ralet D, Regan PH, Rezynkina K, Sánchez-Tembleque V, Siem S, Schmitt C, Söderström PA, Sürder C, Tocabens G, Vedia V, Verney D, Warr N, Wasilewska B, Wiederhold J, Yavahchova M, Zeiser F, Ziliani S. Angular momentum generation in nuclear fission. Nature 2021; 590:566-570. [PMID: 33627809 DOI: 10.1038/s41586-021-03304-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 12/09/2020] [Indexed: 01/31/2023]
Abstract
When a heavy atomic nucleus splits (fission), the resulting fragments are observed to emerge spinning1; this phenomenon has been a mystery in nuclear physics for over 40 years2,3. The internal generation of typically six or seven units of angular momentum in each fragment is particularly puzzling for systems that start with zero, or almost zero, spin. There are currently no experimental observations that enable decisive discrimination between the many competing theories for the mechanism that generates the angular momentum4-12. Nevertheless, the consensus is that excitation of collective vibrational modes generates the intrinsic spin before the nucleus splits (pre-scission). Here we show that there is no significant correlation between the spins of the fragment partners, which leads us to conclude that angular momentum in fission is actually generated after the nucleus splits (post-scission). We present comprehensive data showing that the average spin is strongly mass-dependent, varying in saw-tooth distributions. We observe no notable dependence of fragment spin on the mass or charge of the partner nucleus, confirming the uncorrelated post-scission nature of the spin mechanism. To explain these observations, we propose that the collective motion of nucleons in the ruptured neck of the fissioning system generates two independent torques, analogous to the snapping of an elastic band. A parameterization based on occupation of angular momentum states according to statistical theory describes the full range of experimental data well. This insight into the role of spin in nuclear fission is not only important for the fundamental understanding and theoretical description of fission, but also has consequences for the γ-ray heating problem in nuclear reactors13,14, for the study of the structure of neutron-rich isotopes15,16, and for the synthesis and stability of super-heavy elements17,18.
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Affiliation(s)
- J N Wilson
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.
| | - D Thisse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Lebois
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Jovančević
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Gjestvang
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - R Canavan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - M Rudigier
- Department of Physics, University of Surrey, Guildford, UK.,Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - R-B Gerst
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | | | - E Adamska
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Adsley
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Algora
- IFIC, CSIC-University of Valencia, Valencia, Spain.,Institute for Nuclear Research (Atomki), Debrecen, Hungary
| | - M Babo
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Belvedere
- Department of Physics, University of Surrey, Guildford, UK
| | - J Benito
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | | | - A Blazhev
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - A Boso
- National Physical Laboratory, Teddington, UK
| | - S Bottoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - M Bunce
- National Physical Laboratory, Teddington, UK
| | - R Chakma
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | | | - S Courtin
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | | | - P Davies
- School of Physics and Astronomy, University of Manchester, Manchester, UK
| | - C Delafosse
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Fallot
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - B Fornal
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - L Fraile
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - A Gottardo
- INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
| | - V Guadilla
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - G Häfner
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France.,Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - K Hauschild
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - M Heine
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - C Henrich
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - I Homm
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - F Ibrahim
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - Ł W Iskra
- INFN, Milan, Italy.,Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - P Ivanov
- National Physical Laboratory, Teddington, UK
| | - S Jazrawi
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - A Korgul
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - P Koseoglou
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,GSI Helmoltzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - T Kröll
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | | | - L Le Meur
- Subatech, IMT-Atlantique, Université de Nantes, Nantes, France
| | - S Leoni
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
| | - J Ljungvall
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - A Lopez-Martens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - R Lozeva
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - I Matea
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - K Miernik
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - J Nemer
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - S Oberstedt
- European Commission, Joint Research Centre, Geel, Belgium
| | - W Paulsen
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - M Piersa
- Faculty of Physics, University of Warsaw, Warsaw, Poland
| | - Y Popovitch
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - C Porzio
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy.,TRIUMF, Vancouver, British Columbia, Canada
| | - L Qi
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - D Ralet
- Grand Accélérateur National d'Ions Lourds, Caen, France
| | - P H Regan
- Department of Physics, University of Surrey, Guildford, UK.,National Physical Laboratory, Teddington, UK
| | - K Rezynkina
- Institute for Nuclear and Radiation Physics, Katholieke Universiteit Leuven, Leuven, Belgium
| | - V Sánchez-Tembleque
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - S Siem
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - C Schmitt
- Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
| | - P-A Söderström
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany.,Extreme Light Infrastructure-Nuclear Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Măgurele, Romania
| | - C Sürder
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - G Tocabens
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - V Vedia
- Grupo de Fisica Nuclear & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, Madrid, Spain
| | - D Verney
- Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
| | - N Warr
- Institut für Kernphysik, Universität zu Köln, Cologne, Germany
| | - B Wasilewska
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - J Wiederhold
- Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Darmstadt, Germany
| | - M Yavahchova
- Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - F Zeiser
- Department of Physics, University of Oslo, Blindern, Oslo, Norway
| | - S Ziliani
- INFN, Milan, Italy.,Dipartimento di Fisica, Universitá degli Studi di Milano, Milan, Italy
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Schmidt KH, Estienne M, Fallot M, Jurado B, Schmitt C. Structural effects in the production of neutrons, gammas and anti-neutrinos in fission. EPJ Web Conf 2021. [DOI: 10.1051/epjconf/202125600015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Structural effects in the production of light particles in fission are investigated. Most of these effects can be traced back to pairing correlations and shell effects and their dependencies on the composition of the fissioning system and its excitation energy. It is shown that the GEF code is able to reproduce most of these features and to explain their origin on the basis of established properties of nuclear matter as well as concepts and laws of general validity. Predictions for systems with scarce or no experimental information can also be made.
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3
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Estienne M, Fallot M, Algora A, Briz-Monago J, Bui VM, Cormon S, Gelletly W, Giot L, Guadilla V, Jordan D, Le Meur L, Porta A, Rice S, Rubio B, Taín JL, Valencia E, Zakari-Issoufou AA. Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes. Phys Rev Lett 2019; 123:022502. [PMID: 31386517 DOI: 10.1103/physrevlett.123.022502] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 04/02/2019] [Indexed: 06/10/2023]
Abstract
A new summation method model of the reactor antineutrino energy spectrum is presented. It is updated with the most recent evaluated decay databases and with our total absorption gamma-ray spectroscopy measurements performed during the last decade. For the first time, the spectral measurements from the Daya Bay experiment are compared with the antineutrino energy spectrum computed with the updated summation method without any renormalization. The results exhibit a better agreement than is obtained with the Huber-Mueller model in the 2-5 MeV range, the region that dominates the detected flux. A systematic trend is found in which the antineutrino flux computed with the summation model decreases with the inclusion of more pandemonium-free data. The calculated flux obtained now lies only 1.9% above that detected in the Daya Bay experiment, a value that may be reduced with forthcoming new pandemonium-free data, leaving less room for a reactor anomaly. Eventually, the new predictions of individual antineutrino spectra for the ^{235}U, ^{239}Pu, ^{241}Pu, and ^{238}U are used to compute the dependence of the reactor antineutrino spectral shape on the fission fractions.
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Affiliation(s)
- M Estienne
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - M Fallot
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - A Algora
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46071 València, Spain
- Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4026 Debrecen, Hungary
| | - J Briz-Monago
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - V M Bui
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - S Cormon
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - W Gelletly
- Department of Physics, University of Surrey, GU2 7XH Guildford, United Kingdom
| | - L Giot
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - V Guadilla
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - D Jordan
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46071 València, Spain
| | - L Le Meur
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - A Porta
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - S Rice
- Department of Physics, University of Surrey, GU2 7XH Guildford, United Kingdom
| | - B Rubio
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46071 València, Spain
| | - J L Taín
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46071 València, Spain
| | - E Valencia
- Instituto de Física Corpuscular, CSIC-Universitat de València, E-46071 València, Spain
| | - A-A Zakari-Issoufou
- SUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
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4
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Guadilla V, Algora A, Tain JL, Estienne M, Fallot M, Sonzogni AA, Agramunt J, Äystö J, Briz JA, Cucoanes A, Eronen T, Fraile LM, Ganioğlu E, Gelletly W, Gorelov D, Hakala J, Jokinen A, Jordan D, Kankainen A, Kolhinen V, Koponen J, Lebois M, Le Meur L, Martinez T, Monserrate M, Montaner-Pizá A, Moore I, Nácher E, Orrigo SEA, Penttilä H, Pohjalainen I, Porta A, Reinikainen J, Reponen M, Rinta-Antila S, Rubio B, Rytkönen K, Shiba T, Sonnenschein V, Valencia E, Vedia V, Voss A, Wilson JN, Zakari-Issoufou AA. Large Impact of the Decay of Niobium Isomers on the Reactor ν[over ¯]_{e} Summation Calculations. Phys Rev Lett 2019; 122:042502. [PMID: 30768318 DOI: 10.1103/physrevlett.122.042502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/23/2018] [Indexed: 06/09/2023]
Abstract
Even mass neutron-rich niobium isotopes are among the principal contributors to the reactor antineutrino energy spectrum. They are also among the most challenging to measure due to the refractory nature of niobium, and because they exhibit isomeric states lying very close in energy. The β-intensity distributions of ^{100gs,100m}Nb and ^{102gs,102m}Nb β decays have been determined using the total absorption γ-ray spectroscopy technique. The measurements were performed at the upgraded Ion Guide Isotope Separator On-Line facility at the University of Jyväskylä. Here, the double Penning trap system JYFLTRAP was employed to disentangle the β decay of the isomeric states. The new data obtained in this challenging measurement have a large impact in antineutrino summation calculations. For the first time the discrepancy between the summation model and the reactor antineutrino measurements in the region of the shape distortion has been reduced.
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Affiliation(s)
- V Guadilla
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - A Algora
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
- Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen H-4026, Hungary
| | - J L Tain
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - M Estienne
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - M Fallot
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - A A Sonzogni
- NNDC, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - J Agramunt
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - J Äystö
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - J A Briz
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - A Cucoanes
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - T Eronen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - L M Fraile
- Universidad Complutense, Grupo de Física Nuclear and UPARCOS, CEI Moncloa, E-28040 Madrid, Spain
| | - E Ganioğlu
- Department of Physics, Istanbul University, 34134 Istanbul, Turkey
| | - W Gelletly
- Department of Physics, University of Surrey, GU2 7XH Guildford, United Kingdom
| | - D Gorelov
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - J Hakala
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - A Jokinen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - D Jordan
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - A Kankainen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - V Kolhinen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - J Koponen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - M Lebois
- Institut de Physique Nuclèaire d'Orsay, 91406 Orsay, France
| | - L Le Meur
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - T Martinez
- Centro de Investigaciones Energéticas Medioambientales y Tecnológicas, E-28040 Madrid, Spain
| | - M Monserrate
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - A Montaner-Pizá
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - I Moore
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - E Nácher
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
| | - S E A Orrigo
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - H Penttilä
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - I Pohjalainen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - A Porta
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | - J Reinikainen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - M Reponen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | | | - B Rubio
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - K Rytkönen
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - T Shiba
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
| | | | - E Valencia
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - V Vedia
- Universidad Complutense, Grupo de Física Nuclear and UPARCOS, CEI Moncloa, E-28040 Madrid, Spain
| | - A Voss
- University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - J N Wilson
- Institut de Physique Nuclèaire d'Orsay, 91406 Orsay, France
| | - A-A Zakari-Issoufou
- Subatech, IMT-Atlantique, Université de Nantes, CNRS-IN2P3, F-44307 Nantes, France
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Estienne M, Fallot M, Giot L, Guadilla-Gomez V, Le Meur L, Porta A, Algora A, Taìn JL, Briz JA, Agramunt J, Äystö J, Cormon S, Cucoanes A, Eronen T, Fraile LM, Ganogliu E, Gelletly W, Gorelov D, Hakala J, Jokinen A, Jordan MD, Kankainen A, Kolhinen VS, Koponen J, Lebois M, Martinez T, Monserrate M, Montaner-Pizá A, Moore I, Nácher E, Orrigo SEA, Penttilä H, Pohjalainen I, Reinikainen J, Reponen M, Rinta-Antila S, Rytkönen K, Rubio B, Shiba T, Sonnenschein V, Sonzogni AA, Valencia E, Vedia V, Voss A, Weber C, Wilson JN, Zakari-Issoufou AA. Summation Calculations for Reactor Antineutrino Spectra, Decay Heat and Delayed Neutron Fractions Involving New TAGS Data and Evaluated Databases. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201921101001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Three observables of interest for present and future reactors depend on the β decay properties of the fission products: antineutrinos from reactors, the reactor decay heat and delayed neutron emission. In these proceedings, we present new results from summation calculations of the first two quantities quoted above, performed with evolved independent yields coupled with fission product decay data, from various nuclear data bases or models. New TAGS results from the latest experiment of the TAGS collaboration at the JYFL facility of Jyväskylä will be displayed as well as their impact on the antineutrino spectra and the decay heat associated to fission pulses of the main actinides.
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Tain J, Guadilla V, Valencia E, Algora A, Zakari-Issoufou AA, Rice S, Meur LL, Agramunt J, Äystö J, Batist L, Bowry M, Briz J, Bui V, Caballero-Folch R, Cano-Ott D, Cucoanes A, Elomaa VV, Eronen T, Estevez E, Estienne M, Fallot M, Farrelly G, Fraile L, Ganioglu E, Garcia A, Gelletly W, Gómez-Hornillos B, Gorelov D, Gorlychev V, Hakala J, Jokinen A, Jordan M, Kankainen A, Kolhinen V, Kondev F, Koponen J, Lebois M, Martínez T, Mason P, Mendoza E, Monserrate M, Montaner-Pizá A, Moore I, Nacher E, Orrigo S, Penttilä H, Podolyák Z, Pohjalainen I, Porta A, Regan P, Reinikainen J, Reponen M, Rinta-Antila S, Rissanen J, Rubio B, Rytkönen K, Shiba T, Sonnenschein V, Sonzogni A, Vedia V, Voss A, Wilson J. Strong γ-ray emission from neutron unbound states populated in β-decay: Impact on (n,γ) cross-section estimates. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201714601002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Fallot M, Porta A, Meur LL, Briz J, Zakari-Issoufou AA, Guadilla V, Algora A, Taìn JL, Valencia E, Rice S, Bui V, Cormon S, Estienne M, Agramunt J, Äystö J, Batist L, Bowry M, Caballero-Folch R, Cano-Ott D, Cucoanes A, Elomaa VV, Eronen T, Estévez E, Farrelly G, Fraile L, Fleming M, Ganogliu E, Garcia A, Gelletly W, Gomez-Hornillos M, Gorelov D, Gorlychev V, Hakala J, Jokinen A, Jordan M, Kankainen A, Karvonen P, Kolhinen V, Kondev F, Koponen J, Lebois M, Martinez T, Mason P, Mendoza E, Molina F, Monserrate M, Montaner-Pizá A, Moore I, Nácher E, Orrigo S, Penttilä H, Perez A, Podolyák Z, Pohjalainen I, Regan P, Reinikainen J, Reponen M, Rinta-Antila S, Rissanen J, Rubio B, Shiba T, Sonnenschein V, Sonzogni A, Sublet JC, Vedia V, Voss A, Weber C, Wilson J. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201714610002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Algora A, Rice S, Guadilla V, Tain J, Valencia E, Zakari-Issoufou AA, Agramunt J, Äystö J, Batist L, Briz J, Bowry M, Bui V, Caballero-Folch R, Cano-Ott D, Cucoanes A, Eronen T, Elomaa V, Estevez E, Estienne M, Fallot M, Farrelly G, Fraile L, Fleming M, Ganioglu E, Garcia A, Gelletly W, Gómez-Hornillos B, Gorelov D, Gorlychev V, Hakala J, Jokinen A, Jordan D, Kankainen A, Kolhinen V, Kondev F, Koponen J, Lebois M, Martinez T, Mason P, Mendoza E, Monserrate M, Montaner-Pizá A, Moore I, Nácher E, Orrigo S, Penttilä H, Podolyák Z, Pohjalainen I, Porta A, Regan P, Reinikainen J, Reponen M, Rinta-Antila S, Rissanen J, Rubio B, Rytkönen K, Shiba T, Sonnenschein V, Sonzogni A, Sublet JC, Vedia V, Voss A, Wilson J. Total absorption studies of high priority decays for reactor applications: 86Br and 91Rb. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201714610001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Guadilla V, Algora A, Tain J, Agramunt J, Äystö J, Briz J, Cucoanes A, Eronen T, Estienne M, Fallot M, Fraile L, Ganioğlu E, Gelletly W, Gorelov D, Hakala J, Jokinen A, Jordan D, Kankainen A, Kolhinen V, Koponen J, Lebois M, Martinez T, Monserrate M, Montaner-Pizá A, Moore I, Nácher E, Orrigo S, Penttilä H, Pohjalainen I, Porta A, Reinikainen J, Reponen M, Rinta-Antila S, Rubio B, Rytkönen K, Shiba T, Sonnenschein V, Sonzogni A, Valencia E, Vedia V, Voss A, Wilson J, Zakari-Issoufou AA. TAGS measurements of 100Nb ground and isomeric states and 140Cs for neutrino physics with the new DTAS detector. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201714610010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Porta A, Zakari-Issoufou AA, Fallot M, Algora A, Tain J, Valencia E, Rice S, Bui V, Cormon S, Estienne M, Agramunt J, Äystö J, Bowry M, Briz J, Caballero-Folch R, Cano-Ott D, Cucouanes A, Elomaa VV, Eronen T, Estévez E, Farrelly G, Garcia A, Gelletly W, Gomez-Hornillos M, Gorlychev V, Hakala J, Jokinen A, Jordan M, Kankainen A, Karvonen P, Kolhinen V, Kondev F, Martinez T, Mendoza E, Molina F, Moore I, Perez-Cerdán AB, Podolyák Z, Penttilä H, Regan P, Reponen M, Rissanen J, Rubio B, Shiba T, Sonzogni A, Weber C. Total Absorption Spectroscopy of Fission Fragments Relevant for Reactor Antineutrino Spectra and Decay Heat Calculations. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611108006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Zakari-Issoufou AA, Fallot M, Porta A, Algora A, Tain JL, Valencia E, Rice S, Bui VM, Cormon S, Estienne M, Agramunt J, Äystö J, Bowry M, Briz JA, Caballero-Folch R, Cano-Ott D, Cucoanes A, Elomaa VV, Eronen T, Estévez E, Farrelly GF, Garcia AR, Gelletly W, Gomez-Hornillos MB, Gorlychev V, Hakala J, Jokinen A, Jordan MD, Kankainen A, Karvonen P, Kolhinen VS, Kondev FG, Martinez T, Mendoza E, Molina F, Moore I, Perez-Cerdán AB, Podolyák Z, Penttilä H, Regan PH, Reponen M, Rissanen J, Rubio B, Shiba T, Sonzogni AA, Weber C. Total Absorption Spectroscopy Study of (92)Rb Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape. Phys Rev Lett 2015; 115:102503. [PMID: 26382674 DOI: 10.1103/physrevlett.115.102503] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Indexed: 06/05/2023]
Abstract
The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. (92)Rb makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied (92)Rb decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.
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Affiliation(s)
- A-A Zakari-Issoufou
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - M Fallot
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - A Porta
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - A Algora
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
- Institute of Nuclear Research, MTA ATOMKI, Debrecen, 4026 Hungary
| | - J L Tain
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - E Valencia
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - S Rice
- Department of Physics, University of Surrey, Guildford GU27XH, United Kingdom
| | - V M Bui
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - S Cormon
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - M Estienne
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - J Agramunt
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - J Äystö
- Helsinki Institute of Physics, University of Helsinki, FI-00014 Helsinki, Finland
| | - M Bowry
- Department of Physics, University of Surrey, Guildford GU27XH, United Kingdom
| | - J A Briz
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | | | - D Cano-Ott
- Centro de Investigaciones Energéticas Medioambientales Y Tecnológicas, E-28040 Madrid, Spain
| | - A Cucoanes
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - V-V Elomaa
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - T Eronen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - E Estévez
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - G F Farrelly
- Department of Physics, University of Surrey, Guildford GU27XH, United Kingdom
| | - A R Garcia
- Centro de Investigaciones Energéticas Medioambientales Y Tecnológicas, E-28040 Madrid, Spain
| | - W Gelletly
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
- Department of Physics, University of Surrey, Guildford GU27XH, United Kingdom
| | | | - V Gorlychev
- Universitat Politécnica de Catalunya (UPC), 08034 Barcelona, Spain
| | - J Hakala
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - A Jokinen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - M D Jordan
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - A Kankainen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - P Karvonen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - V S Kolhinen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - F G Kondev
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - T Martinez
- Centro de Investigaciones Energéticas Medioambientales Y Tecnológicas, E-28040 Madrid, Spain
| | - E Mendoza
- Centro de Investigaciones Energéticas Medioambientales Y Tecnológicas, E-28040 Madrid, Spain
| | - F Molina
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - I Moore
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - A B Perez-Cerdán
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - Zs Podolyák
- Department of Physics, University of Surrey, Guildford GU27XH, United Kingdom
| | - H Penttilä
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - P H Regan
- Department of Physics, University of Surrey, Guildford GU27XH, United Kingdom
- National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom
| | - M Reponen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - J Rissanen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - B Rubio
- Instituto de Física Corpuscular (CSIC-Universitat de Valencia), Apartado Correos 22085, E-46071 Valencia, Spain
| | - T Shiba
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
| | - A A Sonzogni
- National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - C Weber
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
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Tain JL, Valencia E, Algora A, Agramunt J, Rubio B, Rice S, Gelletly W, Regan P, Zakari-Issoufou AA, Fallot M, Porta A, Rissanen J, Eronen T, Äystö J, Batist L, Bowry M, Bui VM, Caballero-Folch R, Cano-Ott D, Elomaa VV, Estevez E, Farrelly GF, Garcia AR, Gomez-Hornillos B, Gorlychev V, Hakala J, Jordan MD, Jokinen A, Kolhinen VS, Kondev FG, Martínez T, Mendoza E, Moore I, Penttilä H, Podolyák Z, Reponen M, Sonnenschein V, Sonzogni AA. Enhanced γ-Ray Emission from Neutron Unbound States Populated in β Decay. Phys Rev Lett 2015; 115:062502. [PMID: 26296113 DOI: 10.1103/physrevlett.115.062502] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Indexed: 06/04/2023]
Abstract
Total absorption spectroscopy is used to investigate the β-decay intensity to states above the neutron separation energy followed by γ-ray emission in (87,88)Br and (94)Rb. Accurate results are obtained thanks to a careful control of systematic errors. An unexpectedly large γ intensity is observed in all three cases extending well beyond the excitation energy region where neutron penetration is hindered by low neutron energy. The γ branching as a function of excitation energy is compared to Hauser-Feshbach model calculations. For (87)Br and (88)Br the γ branching reaches 57% and 20%, respectively, and could be explained as a nuclear structure effect. Some of the states populated in the daughter can only decay through the emission of a large orbital angular momentum neutron with a strongly reduced barrier penetrability. In the case of neutron-rich (94)Rb the observed 4.5% branching is much larger than the calculations performed with standard nuclear statistical model parameters, even after proper correction for fluctuation effects on individual transition widths. The difference can be reconciled by introducing an enhancement of 1 order of magnitude in the photon strength to neutron strength ratio. An increase in the photon strength function of such magnitude for very neutron-rich nuclei, if it proves to be correct, leads to a similar increase in the (n,γ) cross section that would have an impact on r process abundance calculations.
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Affiliation(s)
- J L Tain
- Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia), Apdo. Correos 22085, E-46071 Valencia, Spain
| | - E Valencia
- Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia), Apdo. Correos 22085, E-46071 Valencia, Spain
| | - A Algora
- Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia), Apdo. Correos 22085, E-46071 Valencia, Spain
| | - J Agramunt
- Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia), Apdo. Correos 22085, E-46071 Valencia, Spain
| | - B Rubio
- Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia), Apdo. Correos 22085, E-46071 Valencia, Spain
| | - S Rice
- University of Surrey, Department of Physics, Guildford GU2 7XH, United Kingdom
| | - W Gelletly
- University of Surrey, Department of Physics, Guildford GU2 7XH, United Kingdom
| | - P Regan
- University of Surrey, Department of Physics, Guildford GU2 7XH, United Kingdom
| | - A-A Zakari-Issoufou
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines, F-44307 Nantes, France
| | - M Fallot
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines, F-44307 Nantes, France
| | - A Porta
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines, F-44307 Nantes, France
| | - J Rissanen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - T Eronen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - J Äystö
- Helsinki Institute of Physics, University of Helsinki, FI00014 Helsinki, Finland
| | - L Batist
- Petersburg Nuclear Physics Institute, RU-188300 Gatchina, Russia
| | - M Bowry
- University of Surrey, Department of Physics, Guildford GU2 7XH, United Kingdom
| | - V M Bui
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines, F-44307 Nantes, France
| | | | - D Cano-Ott
- Centro de Investigaciones Energéticas Medioambientales y Tecnólogicas, E-28040 Madrid, Spain
| | - V-V Elomaa
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - E Estevez
- Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia), Apdo. Correos 22085, E-46071 Valencia, Spain
| | - G F Farrelly
- University of Surrey, Department of Physics, Guildford GU2 7XH, United Kingdom
| | - A R Garcia
- Centro de Investigaciones Energéticas Medioambientales y Tecnólogicas, E-28040 Madrid, Spain
| | | | - V Gorlychev
- Universitat Politecnica de Catalunya, E-08028 Barcelona, Spain
| | - J Hakala
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - M D Jordan
- Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia), Apdo. Correos 22085, E-46071 Valencia, Spain
| | - A Jokinen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - V S Kolhinen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - F G Kondev
- Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - T Martínez
- Centro de Investigaciones Energéticas Medioambientales y Tecnólogicas, E-28040 Madrid, Spain
| | - E Mendoza
- Centro de Investigaciones Energéticas Medioambientales y Tecnólogicas, E-28040 Madrid, Spain
| | - I Moore
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - H Penttilä
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Zs Podolyák
- University of Surrey, Department of Physics, Guildford GU2 7XH, United Kingdom
| | - M Reponen
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - V Sonnenschein
- University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - A A Sonzogni
- NNDC, Brookhaven National Laboratory, Upton, New York 11973, USA
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15
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Zakari-Issoufou AA, Porta A, Fallot M, Algora A, Tain J, Valencia E, Rice S, Agramunt J, Äystö J, Bowry M, Bui V, Caballero-Folch R, Cano-Ott D, Eloma V, Estévez E, Farrelly G, Garcia A, Gelletly W, Gomez-Hornillos M, Gorlychev V, Hakala J, Jokinen A, Jordan M, Kankainen A, Kondev F, Martinez T, Mendoza E, Molina F, Moore I, Perez A, Podolyak Z, Penttilä H, Regan P, Rissanen J, Rubio B, Weber C. Results of fission productsβdecay properties measurement performed with a total absorption spectrometer. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146610019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Valencia E, Algora A, Tain JL, Rice S, Agramunt J, Zakari-Issoufou AA, Äystö J, Bowry M, Bui VM, Caballero-Folch R, Cano-Ott D, Eloma V, Eronen T, Estevez E, Farrelly G, Fallot M, Garcia A, Gelletly W, Gomez-Hornillos M, Gorlychev V, Hakala J, Jokinen A, Jordan MD, Kankainen A, Kondev FG, Martinez T, Mendoza E, Molina F, Moore I, Perez A, Podolyak Z, Penttilä H, Porta A, Regan PH, Rissanen J, Rubio B, Weber C. Gamma/neutron competition above the neutron separation energy in delayed neutron emitters. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146602002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Abe Y, Aberle C, dos Anjos JC, Barriere JC, Bergevin M, Bernstein A, Bezerra TJC, Bezrukhov L, Blucher E, Bowden NS, Buck C, Busenitz J, Cabrera A, Caden E, Camilleri L, Carr R, Cerrada M, Chang PJ, Chimenti P, Classen T, Collin AP, Conover E, Conrad JM, Crespo-Anadón JI, Crum K, Cucoanes A, D’Agostino MV, Damon E, Dawson JV, Dazeley S, Dietrich D, Djurcic Z, Dracos M, Durand V, Ebert J, Efremenko Y, Elnimr M, Erickson A, Etenko A, Fallot M, Fechner M, von Feilitzsch F, Felde J, Fernandes SM, Fischer V, Franco D, Franke AJ, Franke M, Furuta H, Gama R, Gil-Botella I, Giot L, Göger-Neff M, Gonzalez LFG, Goodenough L, Goodman MC, Goon JTM, Greiner D, Haag N, Habib S, Hagner C, Hara T, Hartmann FX, Haser J, Hatzikoutelis A, Hayakawa T, Hofmann M, Horton-Smith GA, Hourlier A, Ishitsuka M, Jochum J, Jollet C, Jones CL, Kaether F, Kalousis LN, Kamyshkov Y, Kaplan DM, Kawasaki T, Keefer G, Kemp E, de Kerret H, Kibe Y, Konno T, Kryn D, Kuze M, Lachenmaier T, Lane CE, Langbrandtner C, Lasserre T, Letourneau A, Lhuillier D, Lima HP, Lindner M, López-Castaño JM, LoSecco JM, Lubsandorzhiev BK, Lucht S, McKee D, Maeda J, Maesano CN, Mariani C, Maricic J, Martino J, Matsubara T, Mention G, Meregaglia A, Meyer M, Miletic T, Milincic R, Miyata H, Mueller TA, Nagasaka Y, Nakajima K, Novella P, Obolensky M, Oberauer L, Onillon A, Osborn A, Ostrovskiy I, Palomares C, Pepe IM, Perasso S, Perrin P, Pfahler P, Porta A, Potzel W, Pronost G, Reichenbacher J, Reinhold B, Remoto A, Röhling M, Roncin R, Roth S, Rybolt B, Sakamoto Y, Santorelli R, Sato F, Schönert S, Schoppmann S, Schwetz T, Shaevitz MH, Shimojima S, Shrestha D, Sida JL, Sinev V, Skorokhvatov M, Smith E, Spitz J, Stahl A, Stancu I, Stokes LFF, Strait M, Stüken A, Suekane F, Sukhotin S, Sumiyoshi T, Sun Y, Svoboda R, Terao K, Tonazzo A, Toups M, Trinh Thi HH, Valdiviesso G, Veyssiere C, Wagner S, Watanabe H, White B, Wiebusch C, Winslow L, Worcester M, Wurm M, Yermia F, Zimmer V. Direct measurement of backgrounds using reactor-off data in Double Chooz. Int J Clin Exp Med 2013. [DOI: 10.1103/physrevd.87.011102] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Zakari-Issoufou AA, Porta A, Fallot M, Algora A, Tain J, Valencia E, Rice S, Agramunt J, Äystö J, Bowry M, Bui V, Caballero-Folch R, Cano-Ott D, Eloma V, Estévez E, Farrelly G, Garcia A, Gelletly W, Gomez-Hornillos M, Gorlychev V, Hakala J, Jokinen A, Jordan M, Kankainen A, Kondev F, Martinez T, Mendoza E, Molina F, Moore I, Perez A, Podolyak Z, Penttilä H, Regan P, Rissanen J, Rubio B, Weber C. Measurement of fission products βdecay properties using a total absorption spectrometer. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136201007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Fallot M, Cormon S, Estienne M, Algora A, Bui V, Cucoanes A, Elnimr M, Giot L, Jordan D, Martino J, Onillon A, Porta A, Pronost G, Remoto A, Taín J, Yermia F, Zakari-Issoufou AA. Contribution of recently measured nuclear data to reactor antineutrino energy spectra predictions. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136207007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Fallot M, Cormon S, Estienne M, Algora A, Bui VM, Cucoanes A, Elnimr M, Giot L, Jordan D, Martino J, Onillon A, Porta A, Pronost G, Remoto A, Taín JL, Yermia F, Zakari-Issoufou AA. New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products. Phys Rev Lett 2012; 109:202504. [PMID: 23215477 DOI: 10.1103/physrevlett.109.202504] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Indexed: 06/01/2023]
Abstract
In this Letter, we study the impact of the inclusion of the recently measured beta decay properties of the (102;104;105;106;107)Tc, (105)Mo, and (101)Nb nuclei in an updated calculation of the antineutrino energy spectra of the four fissible isotopes (235,238)U and (239,241)Pu. These actinides are the main contributors to the fission processes in pressurized water reactors. The beta feeding probabilities of the above-mentioned Tc, Mo, and Nb isotopes have been found to play a major role in the γ component of the decay heat of (239)Pu, solving a large part of the γ discrepancy in the 4-3000 s range. They have been measured by using the total absorption technique, insensitive to the pandemonium effect. The calculations are performed by using the information available nowadays in the nuclear databases, summing all the contributions of the beta decay branches of the fission products. Our results provide a new prediction of the antineutrino energy spectra of (235)U, (239,241)Pu, and, in particular, (238)U for which no measurement has been published yet. We conclude that new total absorption technique measurements are mandatory to improve the reliability of the predicted spectra.
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Affiliation(s)
- M Fallot
- SUBATECH, CNRS/IN2P3, Université de Nantes, Ecole des Mines de Nantes, F-44307 Nantes, France
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21
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Abe Y, Aberle C, Akiri T, dos Anjos JC, Ardellier F, Barbosa AF, Baxter A, Bergevin M, Bernstein A, Bezerra TJC, Bezrukhov L, Blucher E, Bongrand M, Bowden NS, Buck C, Busenitz J, Cabrera A, Caden E, Camilleri L, Carr R, Cerrada M, Chang PJ, Chimenti P, Classen T, Collin AP, Conover E, Conrad JM, Cormon S, Crespo-Anadón JI, Cribier M, Crum K, Cucoanes A, D'Agostino MV, Damon E, Dawson JV, Dazeley S, Dierckxsens M, Dietrich D, Djurcic Z, Dracos M, Durand V, Efremenko Y, Elnimr M, Endo Y, Etenko A, Falk E, Fallot M, Fechner M, von Feilitzsch F, Felde J, Fernandes SM, Franco D, Franke AJ, Franke M, Furuta H, Gama R, Gil-Botella I, Giot L, Göger-Neff M, Gonzalez LFG, Goodman MC, Goon JTM, Greiner D, Guillon B, Haag N, Hagner C, Hara T, Hartmann FX, Hartnell J, Haruna T, Haser J, Hatzikoutelis A, Hayakawa T, Hofmann M, Horton-Smith GA, Ishitsuka M, Jochum J, Jollet C, Jones CL, Kaether F, Kalousis L, Kamyshkov Y, Kaplan DM, Kawasaki T, Keefer G, Kemp E, de Kerret H, Kibe Y, Konno T, Kryn D, Kuze M, Lachenmaier T, Lane CE, Langbrandtner C, Lasserre T, Letourneau A, Lhuillier D, Lima HP, Lindner M, Liu Y, López-Castanõ JM, LoSecco JM, Lubsandorzhiev BK, Lucht S, McKee D, Maeda J, Maesano CN, Mariani C, Maricic J, Martino J, Matsubara T, Mention G, Meregaglia A, Miletic T, Milincic R, Milzstajn A, Miyata H, Motta D, Mueller TA, Nagasaka Y, Nakajima K, Novella P, Obolensky M, Oberauer L, Onillon A, Osborn A, Ostrovskiy I, Palomares C, Peeters SJM, Pepe IM, Perasso S, Perrin P, Pfahler P, Porta A, Potzel W, Queval R, Reichenbacher J, Reinhold B, Remoto A, Reyna D, Röhling M, Roth S, Rubin HA, Sakamoto Y, Santorelli R, Sato F, Schönert S, Schoppmann S, Schwan U, Schwetz T, Shaevitz MH, Shrestha D, Sida JL, Sinev V, Skorokhvatov M, Smith E, Spitz J, Stahl A, Stancu I, Strait M, Stüken A, Suekane F, Sukhotin S, Sumiyoshi T, Sun Y, Sun Z, Svoboda R, Tabata H, Tamura N, Terao K, Tonazzo A, Toups M, Trinh Thi HH, Veyssiere C, Wagner S, Watanabe H, White B, Wiebusch C, Winslow L, Worcester M, Wurm M, Yanovitch E, Yermia F, Zbiri K, Zimmer V. Indication of reactor ν(e) disappearance in the Double Chooz experiment. Phys Rev Lett 2012; 108:131801. [PMID: 22540693 DOI: 10.1103/physrevlett.108.131801] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Indexed: 05/31/2023]
Abstract
The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio of events of 0.944±0.016(stat)±0.040(syst) was obtained in 101 days of running at the Chooz nuclear power plant in France, with two 4.25 GW(th) reactors. The results were obtained from a single 10 m(3) fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 flux measurement after correction for differences in core composition. The deficit can be interpreted as an indication of a nonzero value of the still unmeasured neutrino mixing parameter sin(2)2θ(13). Analyzing both the rate of the prompt positrons and their energy spectrum, we find sin(2)2θ(13)=0.086±0.041(stat)±0.030(syst), or, at 90% C.L., 0.017<sin(2)2θ(13)<0.16.
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Affiliation(s)
- Y Abe
- Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan
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22
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Fallot M, Scarpaci JA, Frascaria N, Blumenfeld Y, Chbihi A, Chomaz P, Désesquelles P, Frankland J, Khan E, Laville JL, Plagnol E, Pollacco EC, Roussel-Chomaz P, Roynette JC, Shrivastava A, Zerguerras T. Evidence for a three-phonon giant resonance state in 40Ca nuclei. Phys Rev Lett 2006; 97:242502. [PMID: 17280273 DOI: 10.1103/physrevlett.97.242502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Revised: 10/27/2006] [Indexed: 05/13/2023]
Abstract
Inelastic scattering of 40Ca on 40Ca at 50 MeV/A has been measured in coincidence with protons at the GANIL facility. The SPEG spectrometer was associated with 240 CsI(Tl) scintillators of the INDRA 4pi array, allowing for the measurement of complete decay events. The missing energy method was applied to these events. For events with excitation energy between 42 and 55 MeV, a direct decay branch by three protons towards the low energy states of 37Cl gives the first evidence for a 3-phonon state built with giant resonances.
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Affiliation(s)
- M Fallot
- Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS-Université Paris Sud, 91406 Orsay cedex, France
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23
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Becheva E, Blumenfeld Y, Khan E, Beaumel D, Daugas JM, Delaunay F, Demonchy CE, Drouart A, Fallot M, Gillibert A, Giot L, Grasso M, Keeley N, Kemper KW, Khoa DT, Lapoux V, Lima V, Musumarra A, Nalpas L, Pollacco EC, Roig O, Roussel-Chomaz P, Sauvestre JE, Scarpaci JA, Skaza F, Than HS. N = 14 shell closure in 22O viewed through a neutron sensitive probe. Phys Rev Lett 2006; 96:012501. [PMID: 16486448 DOI: 10.1103/physrevlett.96.012501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2005] [Indexed: 05/06/2023]
Abstract
To investigate the behavior of the N = 14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2(1)+ inelastic scattering angular distributions for the neutron-rich nucleus 22O were measured using the MUr à STrip detector array at the Grand Accélérateur National d'Ions Lourds facility. A deformation parameter beta(p,p') = 0.26 +/- 0.04 is obtained for the 2(1)+ state, much lower than in 20O, showing a weak neutron contribution to this state. A microscopic analysis was performed using matter and transition densities generated by continuum Skyrme-Hartree-Fock-Bogoliubov and quasiparticle random phase approximation calculations, respectively. The ratio of neutron to proton contributions to the 2(1)+ state is found close to the N/Z ratio, demonstrating a strong N = 14 shell closure in the vicinity of the neutron drip line.
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Affiliation(s)
- E Becheva
- Institut de Physique Nucléaire, IN2P3-CNRS, 91406 Orsay, France
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24
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Adrich P, Klimkiewicz A, Fallot M, Boretzky K, Aumann T, Cortina-Gil D, Pramanik UD, Elze TW, Emling H, Geissel H, Hellström M, Jones KL, Kratz JV, Kulessa R, Leifels Y, Nociforo C, Palit R, Simon H, Surówka G, Sümmerer K, Waluś W. Evidence for pygmy and giant dipole resonances in 130Sn and 132Sn. Phys Rev Lett 2005; 95:132501. [PMID: 16197134 DOI: 10.1103/physrevlett.95.132501] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2005] [Indexed: 05/04/2023]
Abstract
The dipole strength distribution above the one-neutron separation energy was measured in the unstable 130Sn and the double-magic 132Sn isotopes. The results were deduced from Coulomb dissociation of secondary Sn beams with energies around 500 MeV/nucleon, produced by in-flight fission of a primary 238U beam. In addition to the giant dipole resonance, a resonancelike structure ("pygmy resonance") is observed at a lower excitation energy around 10 MeV exhausting a few percent of the isovector E1 energy-weighted sum rule. The results are discussed in the context of a predicted new dipole mode of excess neutrons oscillating out of phase with the core nucleons.
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Affiliation(s)
- P Adrich
- Gesellschaft für Schwerionenforschung (GSI), D-64291 Darmstadt, Germany
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