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Your search keyword '"Pasi Karvonen"' showing total 6 results
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6 results on '"Pasi Karvonen"'

1. New insights into triaxiality and shape coexistence from odd-mass Rh109

Author

Ari Jokinen, Christine Weber, Ani Aprahamian, L. M. Robledo, Juha Äystö, Mallory Smith, Mikael Reponen, Tommi Eronen, H. Mach, Antti Saastamoinen, Pasi Karvonen, B. Bucher, Heikki Penttilä, B. Olaizola, Iain Moore, D. Ghiţă, Juho Rissanen, E. Ruchowska, W. Kurcewicz, Gary Simpson, and L. M. Fraile

Subjects
Physics, Work (thermodynamics), Isotope, 010308 nuclear & particles physics, Nuclear Theory, Nuclear structure, 01 natural sciences, Molecular physics, Measure (mathematics), Atomic orbital, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Rapid shape evolutions near A = 100 are now the focus of much attention in nuclear science. Much of the recent work has been centered on isotopes with Z

Published
2018
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2. Probing the Low-Energy Structure of A = 109 Ru – Pd

Author

M. Reponen, Juha Äystö, Mallory Smith, Pasi Karvonen, Ari Jokinen, Brian Bucher, Juho Rissanen, Tommi Eronen, B. Olaizola, Iain Moore, Christoph Weber, D. Ghiţă, Ani Aprahamian, E. Ruchowska, W. Kurcewicz, Heikki Penttilä, L. M. Fraile, A. Saastomoinen, Henryk Mach, G. S. Simpson, 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 Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)

Subjects
Low energy, Materials science, Chemical physics, Structure (category theory), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016
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3. 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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4. New lifetime measurements inPd109and the onset of deformation atN=60

Author

D. Ghiţă, M. Reponen, Pasi Karvonen, Heikki Penttilä, Tommi Eronen, H. Mach, B. Bucher, Juha Äystö, E. Ruchowska, W. Kurcewicz, Antti Saastamoinen, B. Olaizola, Iain Moore, I. Bentley, Juho Rissanen, Ari Jokinen, L. M. Fraile, Gary Simpson, Ani Aprahamian, Mallory Smith, and Christine Weber

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Fission, Nuclear structure, Nuclear data, 7. Clean energy, 01 natural sciences, Beta decay, Ion, Nuclear physics, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon
Abstract

Several new subnanosecond lifetimes were measured in Pd-109 using the fast-timing beta gamma gamma (t) method. Fission fragments of the A = 109 mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyvaskyla Ion Guide Isotope Separator On-Line (IGISOL) facility. Lifetimes were obtained for excited states in Pd-109 populated following beta decay of Rh-109. The new lifetimes provide some insight into the evolution of nuclear structure in this mass region. In particular, the distinct structure of the two low-lying 7/2(+) states occurring systematically across the Pd isotopic chain is supported by the new lifetime measurements. The available nuclear data indicate a sudden increase in deformation at N = 60 which is related to the strong p-n interaction between pi g(9/2) and vg(7/2) valence nucleons expected in this region.

Published
2015
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5. Total Absorption Spectroscopy Study ofRb92Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape

Author

Tommi Eronen, Pasi Karvonen, Muriel Fallot, T. Martinez, V. Gorlychev, T. Shiba, V.-V. Elomaa, E. Mendoza, P. H. Regan, S. Cormon, M. Reponen, R. Caballero-Folch, Juha Äystö, Juho Rissanen, A. A. Sonzogni, A. B. Perez-Cerdan, E. Valencia, M. D. Jordan, Christoph Weber, M. B. Gómez-Hornillos, A. Cucoanes, Iain Moore, F. G. Kondev, Anu Kankainen, A.-A. Zakari-Issoufou, Alejandro Algora, Veli Kolhinen, M. Estienne, M. Bowry, D. Cano-Ott, F. Molina, J. Agramunt, Heikki Penttilä, V. M. Bui, J. L. Tain, E. Estevez, B. Rubio, Stephen Rice, A. R. García, Jani Hakala, G. F. Farrelly, Zs. Podolyák, J. A. Briz, W. Gelletly, Ari Jokinen, and Amanda Porta

Subjects
Semileptonic decay, Physics, Total absorption spectroscopy, Fission, General Physics and Astronomy, chemistry.chemical_element, Beta decay, Spectral line, Rubidium, Nuclear physics, chemistry, Double beta decay, Atomic physics, Absorption (electromagnetic radiation)
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.

Published
2015
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6. Total Absorption Spectroscopy of Fission Fragments Relevant for Reactor Antineutrino Spectra and Decay Heat Calculations

Author

Iain Moore, Anu Kankainen, A.-A. Zakari-Issoufou, Veli Kolhinen, R. Caballero-Folch, G. F. Farrelly, Zs. Podolyák, T. Shiba, J. L. Tain, F. Molina, Stephen Rice, F. G. Kondev, D. Cano-Ott, Juha Äystö, V.M. Bui, Jani Hakala, Mikael Reponen, M. D. Jordan, Heikki Penttilä, Tommi Eronen, E. Valencia, Muriel Fallot, A. B. Perez-Cerdan, T. Martinez, M. Bowry, E. Estevez, W. Gelletly, M. B. Gómez-Hornillos, V. Gorlychev, S. Cormon, V.-V. Elomaa, A. R. García, Jorge Agramunt, Alejandro Sonzogni, Pasi Karvonen, A. Cucouanes, Christoph Weber, P. H. Regan, Berta Rubio, J. A. Briz, Juho Rissanen, M. Estienne, Amanda Porta, E. Mendoza, Ari Jokinen, A. Algora, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), and Helsinki Institute of Physics

Subjects
Total absorption spectroscopy, Fission, QC1-999, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, 7. Clean energy, 01 natural sciences, Physics::Geophysics, Nuclear physics, rubidium, 0103 physical sciences, fission products, Decay heat, Nuclear Experiment, 010306 general physics, Fission products, Decay scheme, ta114, 010308 nuclear & particles physics, Chemistry, Physics, Xenon-135, Beta decay, 13. Climate action, decay heat, High Energy Physics::Experiment, beta decay, antineutrino emission, Neutrino
Abstract

Volume: 111 Host publication title: WONDER-2015 Host publication sub-title: 4TH INTERNATIONAL WORKSHOP ON NUCLEAR DATA EVALUATION FOR REACTOR APPLICATIONS Isbn(print): 978-2-7598-1970-6 Beta decay of fission products is at the origin of decay heat and antineutrino emission in nuclear reactors. Decay heat represents about 7% of the reactor power during operation and strongly impacts reactor safety. Reactor antineutrino detection is used in several fundamental neutrino physics experiments and it can also be used for reactor monitoring and non-proliferation purposes. Rb-92,Rb-93 are two fission products of importance in reactor antineutrino spectra and decay heat, but their beta-decay properties are not well known. New measurements of Rb-92,Rb-93 beta-decay properties have been performed at the IGISOL facility (Jyvaskyla, Finland) using Total Absorption Spectroscopy (TAS). TAS is complementary to techniques based on Germanium detectors. It implies the use of a calorimeter to measure the total gamma intensity de-exciting each level in the daughter nucleus providing a direct measurement of the beta feeding. In these proceedings we present preliminary results for Rb-93, our measured beta feedings for Rb-92 and we show the impact of these results on reactor antineutrino spectra and decay heat calculations.

Published
2016
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