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1. First laser ions at the CERN-MEDICIS facility

Author

Klaus Wendt, Pascale Fernier, Shane Wilkins, Annie Ringvall Moberg, Vincent Barozier, Felix Weber, Ermanno Barbero, Vadim Maratovich Gadelshin, Thomas Elias Cocolios, Thierry Stora, Dominik Studer, Eric Chevallay, Andres Vieitez Suarez, Kristof Dockx, Ana Paula Bernardes, B. Crepieux, Matthias Eck, Ferid Haddad, Roberto Formento Cavaier, Johannes Jakobi, Sebastian Rothe, J.P. Ramos, S. Marzari, Laura Lambert, B. A. Marsh, Valentin Fedosseev, 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 ARRONAX - (GIP) Groupement d'Intérêt Public [Saint-Herblain] (Institut de Recherche Public)

Subjects
Nuclear and High Energy Physics, Materials science, Nuclear engineering, TERBIUM, NUCLEAR MEDICINE, 030218 nuclear medicine & medical imaging, Isotope separation, law.invention, Ion, 03 medical and health sciences, 0302 clinical medicine, law, LASER RESONANCE IONIZATION, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physical and Theoretical Chemistry, THERANOSTICS, Large Hadron Collider, Condensed Matter Physics, Laser, Mass separation, CERN MEDICIS, Atomic and Molecular Physics, and Optics, Ion source, 3. Good health, RADIOACTIVE ION BEAM, 030220 oncology & carcinogenesis, Resonance ionization, ISOTOPE SEPARATION, Other
Abstract

The CERN-MEDICIS facility aims to produce emerging medical radionuclides for the theranostics approach in nuclear medicine with mass separation of ion beams. To enhance the radioisotope yield and purity of collected samples, the resonance ionization laser ion source MELISSA was constructed, and provided the first laser ions at the facility in 2019. Several operational tests were accomplished to investigate its performance in preparation for the upcoming production of terbium radioisotopes, which are of particular interest for medical applications. © 2020, The Author(s). KU Leuven Horizon 2020: 642889 MEDICIS-PROMED 05P12UMCIA, 05P15UMCIA Open Access funding provided by Projekt DEAL. We would like to acknowledge the help and assistance from the whole MEDICIS collaboration; from CERN-ISOLDE Technical and Physical groups. This research project has been supported by a Marie Skłodowska-Curie Innovative Training Network Fellowship of the European Commission’s Horizon 2020 Programme under contract number 642889 MEDICIS-PROMED; by the German Federal Ministry of Education and Research under the consecutive projects 05P12UMCIA and 05P15UMCIA; by the Research Foundation Flanders FWO (Belgium) and by a KU Leuven START grant.

Published
2020

2. New exotic beams from the SPIRAL 1 upgrade

Author

P. Delahaye, B. Osmond, B. M. Retailleau, V. Kuchi, J. Angot, M. Dubois, P. Jardin, Thierry Stora, J. C. Thomas, E. Traykov, Ville Toivanen, B. Blank, S. Hormigos, P. Chauveau, R. Frigot, Alain Savalle, O. Bajeat, L. Maunoury, J.C. Cam, O. Kamalou, P. Lecomte, B. Jacquot, Predrag Ujić, A. Annaluru, R. C. Vondrasek, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Nuclear engineering, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], tutkimuslaitteet, Cyclotron, FOS: Physical sciences, hiukkaskiihdyttimet, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 7. Clean energy, 01 natural sciences, Ion, law.invention, ion sources, law, Ionization, 0103 physical sciences, Ion sources, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), radioactive ion beams, 010306 general physics, Nuclear Experiment, Instrumentation, Radioactive ion beams, physics.acc-ph, [PHYS]Physics [physics], Physics, 010308 nuclear & particles physics, Accelerators and Storage Rings, Ion source, Upgrade, säteilyfysiikka, Beamline, Physics - Accelerator Physics, AGATA, Beam (structure)
Abstract

Since 2001, the SPIRAL 1 facility has been one of the pioneering facilities in ISOL techniques for reaccelerating radioactive ion beams: the fragmentation of the heavy ion beams of GANIL on graphite targets and subsequent ionization in the Nanogan ECR ion source has permitted to deliver beams of gaseous elements (He, N, O, F, Ne, Ar, Kr) to numerous experiments. Thanks to the CIME cyclotron, energies up to 20 AMeV could be obtained. In 2014, the facility was stopped to undertake a major upgrade, with the aim to extend the production capabilities of SPIRAL 1 to a number of new elements. This upgrade, which is presently under commissioning, consists in the integration of an ECR booster in the SPIRAL 1 beam line to charge breed the beam of different 1+ sources. A FEBIAD source (the so-called VADIS from ISOLDE) was chosen to be the future workhorse for producing many metallic ion beams. The charge breeder is an upgraded version of the Phoenix booster which was previously tested in ISOLDE. The performances of the aforementioned ingredients of the upgrade (targets, 1+ source and charge breeder) have been and are still being optimized in the frame of different European projects (EMILIE, ENSAR and ENSAR2). The upgraded SPIRAL 1 facility will provide soon its first new beams for physics and further beam development are undertaken to prepare for the next AGATA campaign. The results obtained during the on-line commissioning period permit to evaluate intensities for new beams from the upgraded facility., 9 pages, 12 figures, conference proceedings of EMIS 2018, CERN, Geneva, to appear in Nuclear Instruments and Methods B

Published
2018

3. Collectivity in ${}^{\mathrm{196,198}}$Pb isotopes probed in Coulomb-excitation experiments at REX-ISOLDE

Author

B Seibeck, K Hadyńska-Klȩk, Pascal Fernier, D. G. Jenkins, A. Herzáň, E. Rapisarda, Philippos Papadakis, K. Wrzosek-Lipska, Fredrik Wenander, B Lannoo, D. Voulot, Alejandro Algora, Pauli Peura, Thierry Stora, G. Rainovski, Liam Gaffney, Joonas Konki, Tuomas Grahn, C. Bauer, Mark Huyse, J. Iwanicki, A. Blazhev, N. Warr, Janne Pakarinen, P. Reiter, P. Van Duppen, S. Sambi, M. Seidlitz, M. J. Vermeulen, Panu Rahkila, Thomas Elias Cocolios, N. Kesteloot, N. Bree, Jan Diriken, Marcus Scheck, M. Zielińska, Ulrika Jakobsson, H. De Witte, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Helsinki Institute of Physics

Subjects
Nuclear and High Energy Physics, Coulomb excitation, REX-ISOLDE, SHELL, Hadron, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, 01 natural sciences, Nuclear physics, SHAPE COEXISTENCE, 0103 physical sciences, SCATTERING, radioactive ion beams, ACCELERATED RADIOACTIVE BEAMS, 010306 general physics, Physics, Pb isotopes, NUCLEI, 010308 nuclear & particles physics, Baryon, gamma-ray spectroscopy, EXCITED-STATES, Coulomb-excitation experiment, Excited state, Atomic physics, Ground state, Nucleon, gamma transitions and level energies, Energy (signal processing)
Abstract

The neutron-deficient ${}^{\mathrm{196,198}}$Pb isotopes have been studied in Coulomb-excitation experiments employing the Miniball γ-ray spectrometer and radioactive ion beams from the REX-ISOLDE post-accelerator at CERN. The reduced transition probabilities of the first excited 2+ states in 196Pb and 198Pb nuclei have been measured for the first time. Values of $B(E2)={18.2}_{-4.1}^{+4.8}$ W.u. and $B(E2)={13.1}_{-3.5}^{+4.9}$ W.u., were obtained, respectively. The experiment sheds light on the development of collectivity when moving from the regime governed by the generalised seniority scheme to a region, where intruding structures, associated with different deformed shapes, start to come down in energy and approach the spherical ground state. journal_title: Journal of Physics G: Nuclear and Particle Physics article_type: paper article_title: Collectivity in ${}^{\mathrm{196,198}}$Pb isotopes probed in Coulomb-excitation experiments at REX-ISOLDE copyright_information: © 2017 IOP Publishing Ltd date_received: 2016-10-31 date_accepted: 2017-03-17 date_epub: 2017-05-03 ispartof: Journal of Physics G, Nuclear and Particle Physics vol:44 issue:6 status: published

Published
2017

4. Terbium Radionuclides for Theranostics Applications: A Focus On MEDICIS-PROMED

Author

T. Sounalet, Thierry Stora, I. Zahi, R. Formento Cavaier, Ferid Haddad, 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), Advanced Accelerator Applications, ARRONAX - (GIP) Groupement d'Intérêt Public [Saint-Herblain] (Institut de Recherche Public), European Organization for Nuclear Research (CERN), Université de Nantes - Faculté des Sciences et des Techniques, and Cyclotron ARRONAX

Subjects
[PHYS]Physics [physics], Engineering, business.industry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010403 inorganic & nuclear chemistry, 01 natural sciences, Mass separation, 0104 chemical sciences, Chemical separation, High specific activity, 0103 physical sciences, Systems engineering, European commission, 010306 general physics, business, ComputingMilieux_MISCELLANEOUS
Abstract

A new facility, named CERN-MEDICIS, is under construction at CERN to produce radionuclides for medical applications. In parallel, the MEDICIS-PROMED, a Marie Sklodowska-Curie innovative training network of the Horizon 2020 European Commission‘s program, is being coordinated by CERN to train young scientists on the production and use of innovative radionuclides and develop a network of experts within Europe. One program within MEDICIS-PROMED is to determine the feasibility of producing innovative radioisotopes for theranostics using a commercial middle-sized high-current cyclotron and the mass separation technology developed at CERN-MEDICIS. This will allow the production of high specific activity radioisotopes not achievable with the common post-processing by chemical separation. Radioisotopes of scandium, copper, arsenic and terbium have been identified. Preliminary studies of activation yield and irradiation parameters optimization for the production of Tb-149 will be described.

Published
2017

5. Characterization of uranium carbide target materials to produce neutron-rich radioactive beams

Author

Sandrine Tusseau-Nenez, A. Gottberg, Alberto Andrighetto, C. Lau, Marc Raynaud, Hanna Franberg-Delahaye, Thierry Stora, Joanna Grinyer, Joseph Le Lannic, Loïc Joanny, B. Roussière, A. Said, S. Essabaa, Olivier Tougait, Maher Cheikh Mhamed, Nicole Barré-Boscher, Stefano Corradetti, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CERN [Genève], Laboratori Nazionali di Legnaro (LNL), Istituto Nazionale di Fisica Nucleare (INFN), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), 262010, European Community, 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Nuclear fission product, Materials science, Fission, 02 engineering and technology, Carbon nanotube, Fission products, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, law.invention, Radioactive nuclear beams, chemistry.chemical_compound, law, 0103 physical sciences, [CHIM]Chemical Sciences, Neutron, Uranium carbide, Graphite, Instrumentation, Microstructure, 010302 applied physics, Radiochemistry, 021001 nanoscience & nanotechnology, Release time, Chemical engineering, chemistry, 0210 nano-technology
Abstract

International audience; In the framework of a R&D program aiming to develop uranium carbide (UCx) targets for radioactive nuclear beams, the Institut de Physique Nucléaire d’Orsay (IPNO) has developed an experimental setup to characterize the release of various fission fragments from UCx samples at high temperature. The results obtained in a previous study have demonstrated the feasibility of the method and started to correlate the structural properties of the samples and their behavior in terms of nuclear reaction product release. In the present study, seven UCx samples have been systematically characterized in order to better understand the correlation between their physicochemical characteristics and release properties. Two very different samples, the first one composed of dense UC and the second one of highly porous UCx made of multi-wall carbon nanotubes, were provided by the ActILab (ENSAR) collaboration. The others were synthesized at IPNO. The systems for irradiation and heating necessary for the release studies have been improved with respect to those used in previous studies. The results show that the open porosity is hardly the limiting factor for the fission product release. The homogeneity of the microstructure and the pore size distribution contributes significantly to the increase of the release. The use of carbon nanotubes in place of traditional micrometric graphite particles appears to be promising, even if the homogeneity of the microstructure can still be enhanced

Published
2016

6. Porous silicon carbide and aluminum oxide with unidirectional open porosity as model target materials for radioisotope beam production

Author

Michal Czapski, R. Santos Augusto, Thierry Stora, Florian Bouville, Jérôme Leloup, R. Fernandes Luis, C. Tardivat, Sylvain Deville, Laboratoire de Synthèse et Fonctionnalisation de Céramiques (LSFC), and Saint Gobain-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Materials science, Proton, FOS: Physical sciences, 02 engineering and technology, Applied Physics (physics.app-ph), 01 natural sciences, 7. Clean energy, [SPI.MAT]Engineering Sciences [physics]/Materials, chemistry.chemical_compound, 0103 physical sciences, Silicon carbide, Deposition (phase transition), Nuclear Physics - Experiment, Irradiation, Detectors and Experimental Techniques, Porosity, Instrumentation, Aluminum oxide, 010302 applied physics, Metallurgy, Physics - Applied Physics, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Microstructure, chemistry, 0210 nano-technology, Beam (structure)
Abstract

New silicon carbide (SiC) and aluminum oxide (Al2O3) of a tailor-made microstructure were produced using the ice-templating technique, which permits controlled pore formation conditions within the material. These prototypes will serve to verify aging of the new advanced target materials under irradiation with proton beams. Before this, the evaluation of their mechanical integrity was made based on the energy deposition spectra produced by FLUKA codes., 8 pages, 3 figures

Published
2013

7. Measurement of Volatile Radionuclides Production and Release Yields followed by a Post-Irradiation Analysis of a Pb/Bi Filled Ta Target at ISOLDE

Author

Thierry Stora, Y. Foucher, H. Ravn, S. Leray, Jean-Christophe David, Y. Tall, Arnaud Guertin, H. Frånberg, Etam Noah, N. Thiollière, L. Zanini, M. Fallot, F. Gröschel, Martin Andersson, Enzo Manfrin, Michael Wohlmuther, T. Kirchner, Ulli Köster, K. Berg, S. Cormon, Institut Laue-Langevin (ILL), ILL, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), European Organization for Nuclear Research (CERN), European Spallation Source (ESS), European Spallation Source, Département de Physique Nucléaire (ex SPhN) (DPHN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Paul Scherrer Institute (PSI), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Materials science, Isotope, Proton, 010308 nuclear & particles physics, Tantalum, chemistry.chemical_element, Nuclear data, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Neutron, Spallation, Irradiation, 010306 general physics, Eutectic system
Abstract

International audience; A crucial requirement in the development of liquid-metal spallation neutron target is knowledge of the composition and amount of volatile radionuclides that are released from the target during operation. It is also important to know the total amount produced, which could be released if there was an accident. One type is the lead-bismuth eutectic (LBE) target where different radionuclides can be produced following interaction with a high-energy proton beam, notably noble gases (Ar, Kr, Xe isotopes) and other relative volatile isotopes such as Hg and At. The results of an irradiation experiment performed at ISOLDE on a LBE target are compared with predictions from the MCNPX code using the latest developments on the Li'ege Intranuclear Cascade model (INCL4.6) and the CEM03 model. The calculations are able to reproduce the mass distribution of the radioisotopes produced, including the At production, where there is a significant contribution from secondary reactions. Subsequently, a post-irradiation examination of the irradiated target was performed. Investigations of both the tantalum target structure, in particular the beam window, and the leadbismuth eutectic were performed using several experimental techniques. No sign of severe irradiation damage, previously observed in other ISOLDE targets, was found.

Published
2013

8. Studies of pear-shaped nuclei using accelerated radioactive beams

Author

Mark Huyse, Jan Diriken, D. Radeck, P. J. Napiorkowski, D. T. Joss, S. Bönig, A. B. Hayes, L. M. Robledo, Joonas Konki, C. Y. Wu, D. G. Jenkins, K. Reynders, A. Herzan, M. J. Vermeulen, N. Kesteloot, Fredrik Wenander, N. Bree, P. A. Butler, K. Moschner, Timothy Chupp, Janne Pakarinen, P. Reiter, M. Seidlitz, K. Wrzosek-Lipska, M. Albers, S. Sambi, Kathrin Wimmer, D. Voulot, M. von Schmid, A. Blazhev, D. Cline, Liam Gaffney, C. Bauer, E. Kwan, M. Pfeiffer, M. Kowalczyk, Th. Kröll, P. Thoele, M. Rudigier, Joakim Cederkäll, B. Siebeck, Thomas Davinson, T. Grahn, Thierry Stora, Thomas Elias Cocolios, Marcus Scheck, R. Lutter, Susan Rigby, P. Van Duppen, M. Zielinska, N. Warr, B. Bastin, H. De Witte, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Multidisciplinary, Isotope, ta114, 010308 nuclear & particles physics, Nuclear Theory, Nuclear structure, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Atomic nucleus, Quadrupole, Physics::Accelerator Physics, Neutron, Nuclide, Physics::Atomic Physics, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

There is strong circumstantial evidence that certain heavy, unstable atomic nuclei are ‘octupole deformed’, that is, distorted into a pear shape. This contrasts with the more prevalent rugby-ball shape of nuclei with reflection-symmetric, quadrupole deformations. The elusive octupole deformed nuclei are of importance for nuclear structure theory, and also in searches for physics beyond the standard model; any measurable electric-dipole moment (a signature of the latter) is expected to be amplified in such nuclei. Here we determine electric octupole transition strengths (a direct measure of octupole correlations) for short-lived isotopes of radon and radium. Coulomb excitation experiments were performed using accelerated beams of heavy, radioactive ions. Our data on 220Rn and 224Ra show clear evidence for stronger octupole deformation in the latter. The results enable discrimination between differing theoretical approaches to octupole correlations, and help to constrain suitable candidates for experimental studies of atomic electric-dipole moments that might reveal extensions to the standard model. An experimental study of certain short-lived isotopes of radon and radium has found clear octupole deformation in the nuclei of the latter — that is, these nuclei are pear-shaped; the results enable discrimination between differing theoretical approaches to octupole correlations. The atomic nucleus is a many-body quantum system with a shape determined by the number of nucleons that it contains and the interactions between them. Most of the several thousand known stable and radioactive atomic nuclei, with differing numbers of protons and neutrons, are spherical or rugby-ball shaped. But there is circumstantial evidence that some heavy, unstable nuclides are distorted into a pear shape through the phenomenon of octupole deformation. Samples of these rare atomic species can be accelerated to 8% of the speed of light in the REX-ISOLDE facility at CERN, and now Coulomb excitation experiments on beams of the short-lived isotopes radium-224 and radon-220 have demonstrated clear octupole deformation in the former. The results make it possible to discriminate between the various theoretical models of octupole-deformed nuclei, and are also relevant to the pursuit of physics beyond the Standard Model.

Published
2013

9. Conceptual Design Report for a Beta-Beam Facility

Author

Matteo Magistris, M. Kirk, Michael Benedikt, J. Stadlmann, C. Hansen, L. Bozyk, A. Simonsson, S. Mitrofanov, Holger Podlech, P. Delahaye, Antoine Chancé, Elena Wildner, P. Spiller, E. Bouquerel, Mats Lindroos, Marc Loiselet, S. Trovati, Thierry Stora, Steven Hancock, J. Bruer, A. Lachaize, Adrian Fabich, Vasilis Vlachoudis, A. Bechtold, A. Tkatchenko, A. C. Mueller, F. Borgnolutti, Marco Silari, J. Payet, E. Jensen, A. Kallberg, P. Puppel, European Organization for Nuclear Research (CERN), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Particle physics, Neutrino mass and mixing, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Linear accelerators, Nuclide, Cyclic accelerators and storage rings, 010306 general physics, Neutrino oscillation, Isotopes of helium, 29.20.-c, 29.38.Gj, 29.20.D, 29.20.dk, 29.20.Ej, 14.60.Pq, Physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Reaccelerated radioactive beams, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Radioactive decay, Accelerators, Synchrotrons, Lepton
Abstract

The Beta-Beam is a concept of large-scale facility that aims at providing pure electronic neutrino and antineutrino beams for the measurement of $ \nu_{e}^{}$ $ \rightarrow$ $ \nu_{\mu}^{}$ oscillations. Beta-decaying nuclides are produced in large amounts in a facility of the scale of EURISOL, and are then post-accelerated and stored at large $ \gamma$ in a racetrack decay ring. We present here a conceptual design of the accelerator chain of a Beta-Beam based at CERN.

Published
2011

10. Resonant laser ionization of polonium at rilis-isolde for the study of ground- and isomer-state properties

Author

Etam Noah, S. Franchoo, Thierry Stora, Gerard Huber, B. A. Marsh, Valentin Fedosseev, Ulli Köster, M. D. Seliverstov, Alexandra M. Ionan, Marc Huyse, Yuri Kudryavtsev, Karl Johnston, Piet Van Duppen, Thomas Elias Cocolios, 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), Institut Laue-Langevin (ILL), and ILL

Subjects
Polonium, Nuclear and High Energy Physics, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, law.invention, law, Ionization, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, 010306 general physics, Spectroscopy, Nuclear Experiment, Instrumentation, Isotope, 010308 nuclear & particles physics, Optical transition, Saturation, Laser, Ion source, chemistry, Production yield, Laser ionization, Alpha decay, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Atomic physics
Abstract

Three new ionization schemes for polonium have been tested with the resonant ionization laser ion source (RILIS) during the on-line production of 196Po in a UCx target at ISOLDE. The saturation of the atomic transitions has been observed and the yields of the isotope chain 193–198,200,202,204Po have been measured. This development provides the necessary groundwork for performing in-source resonant ionization spectroscopy on the neutron-deficient polonium isotopes (Z = 84). ispartof: Nuclear Instruments & Methods in Physics Research B vol:266 issue:19 pages:4403-4406 ispartof: location:FRANCE, Deauville status: published

Published
2008

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