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1. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

Author

T. Martinez, Muriel Fallot, E. Estevez, Iain Moore, J. N. Wilson, L. Batist, Anu Kankainen, W. Gelletly, Amanda Porta, Veli Kolhinen, A. Cucoanes, Alejandro Sonzogni, M. Bowry, Juuso Reinikainen, L. M. Fraile, F. G. Kondev, D. Cano-Ott, Jukka Koponen, V. Gorlychev, Pasi Karvonen, Michael Fleming, F. Molina, Enrique Nácher, E. Mendoza, J. A. Briz, A. Perez, A. Montaner-Pizá, Tommi Eronen, Dmitry Gorelov, Juha Äystö, Ari Jokinen, Mikael Reponen, Juho Rissanen, V. Guadilla, Annika Voss, B. Rubio, L. Le Meur, M. B. Gómez-Hornillos, P. J. R. Mason, E. Ganogliu, Volker Sonnenschein, Jorge Agramunt, V. Vedia, A.-A. Zakari-Issoufou, Sami Rinta-Antila, R. Caballero-Folch, C. Weber, P. H. Regan, J. L. Tain, M. Estienne, M. D. Jordan, M. Monserrate, M. Lebois, Heikki Penttilä, Viki-Veikko Elomaa, V. M. Bui, E. Valencia, Ilkka Pohjalainen, A. Algora, Jani Hakala, Stephen Rice, T. Shiba, S.E.A. Orrigo, A. R. García, Jean-Christophe Sublet, S. Cormon, G. F. Farrelly, Zs. Podolyák, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Plompen, A, Hambsch, FJ, Schillebeeckx, P, Mondelaers, W, Heyse, J, Kopecky, S, Siegler, P, Oberstedt, S, Helsinki Institute of Physics, Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Plompen, A., Hambsch, F.-J., Schillebeeckx, P., Mondelaers, W., Heyse, J., Kopecky, S., Siegler, P., Oberstedt, S., Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Total absorption spectroscopy, Fission, QC1-999, CHOOZ, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 114 Physical sciences, Spectral line, law.invention, Physics::Geophysics, Nuclear physics, law, nuclear masses, 0103 physical sciences, structure, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Physics, Fission products, ta114, 010308 nuclear & particles physics, Pressurized water reactor, Nuclear data, Pandemonium effect, PRODUCTS, 13. Climate action, decay data measurements
Abstract

International audience; The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required for the conversion of these spectra into antineutrino spectra is not totally understood. An alternative to such converted spectra is a complementary approach that consists of determining the antineutrino spectrum by means of the measurement and processing of nuclear data. The beta properties of some key fission products suffer from the pandemonium effect which can be circumvented by the use of the Total Absorption Gamma-ray Spectroscopy technique (TAGS). The two main contributors to the Pressurized Water Reactor antineutrino spectrum in the region where the spectral distortion has been observed are 92Rb and 142Cs, which have been measured at the radioactive beam facility of the University of Jyväskylä in two TAGS experiments. We present the results of the analysis of the TAGS measurements of the β-decay properties of 92Rb along with preliminary results on 142Cs and report on the measurements already performed.

Published
2016
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2. Low-spin excitations in the 109Tc nucleus

Author

Tommi Eronen, Ari Jokinen, Heikki Penttilä, Iain Moore, Anu Kankainen, A. Płochocki, Juha Äystö, W. Urban, Jani Hakala, Christine Weber, Viki-Veikko Elomaa, Juho Rissanen, J. A. Pinston, Antti Saastamoinen, J. Kurpeta, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Fission, Prolate spheroid, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], kiihdytinpohjainen fysiikka, 01 natural sciences, ydinrakenne, Double beta decay, 0103 physical sciences, medicine, 010306 general physics, Spectroscopy, nuclear spectroscopy, Physics, ta114, accelerator-based physics, 010308 nuclear & particles physics, Parity (physics), medicine.anatomical_structure, nuclear structure, ydinspektroskopia, Atomic physics, ydinfysiikka, Ground state, Nucleus, Excitation
Abstract

Monoisotopic samples of ${}^{109}$Mo nuclei, produced in the deuteron-induced fission of ${}^{238}$U and separated using the IGISOL mass separator coupled to a Penning trap, were used to perform $\ensuremath{\beta}$- and $\ensuremath{\gamma}$-coincidence spectroscopy of ${}^{109}$Tc. Spin and parity 5/2${}^{+}$ for the ground state of ${}^{109}$Mo, proposed earlier, are supported in the present work. Three new low-energy levels observed in ${}^{109}$Tc are interpreted as bandheads of the $\ensuremath{\pi}3/{2}^{\ensuremath{-}}$[301], $\ensuremath{\pi}5/{2}^{\ensuremath{-}}$[303], and $\ensuremath{\pi}1/{2}^{+}$[431] configurations, respectively. A further three levels observed around 0.4 MeV are interpreted as $K=1/2$ triaxial excitations. A similar interpretation is proposed for an analogous set of three levels observed in ${}^{107}$Tc in another ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay work. The systematics of these excitations breaks down in ${}^{111}$Tc, most likely due to a transition from prolate to oblate deformation. An excitation at 745.0 keV in ${}^{109}$Tc and 850.7 keV in ${}^{107}$Tc is interpreted as the $\ensuremath{\pi}$7/2${}^{+}$[413] configuration. Quasiparticle-rotor model calculations support the proposed interpretations.

Published
2012
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