490 results on '"Björn Jonson"'
Search Results
2. Coulomb dissociation of 16O into 4He and 12C
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Lukas Thomas Bott, Kathrin Göbel, Michael Heil, Aleksandra Kelić-Heil, René Reifarth, Marialuisa Aliotta, Tahani Almusidi, Hector Alvarez-Pol, Leyla Atar, Liam Atkins, Thomas Aumann, Daniel Bemmerer, José Benlliure, Carlos Bertulani, Konstanze Boretzky, Benjamin Brückner, Leonhard Brandenburg, Giovanni Bruni, Pablo Cabanelas Eiras, Christoph Caesar, Enrique Casarejos, Joakim Cederkall, Leonid Chulkov, Dolores Cortina-Gil, Andrey Danilov, Enrico De Filippo, Sophia Florence Dellmann, Isabell Deuter, José Antonio Dueñas Díaz, Meytal Duer, Zoltan Elekes, Philipp Erbacher, Sonia Escribano Rodriguez, Zsolt Fülöp, Ashton Falduto, Manuel Feijoo, Stefan Fiebiger, Igor Gašparić, Daniel Galaviz, María José García Borge, Gabriel García-Jiménez, Elena Geraci, Roman Gernhäuser, Jan Glorius, Brunilde Gnoffo, David González Caamaño, Antia Graña González, Alexander Grein, AnnaLena Hartig, Tanja Heftrich, Henning Heggen, Marcel Heine, Andreas Heinz, Corinna Henrich, Thomas Hensel, Matthias Holl, Ilja Homm, Ákos Horváth, Andrea Horvat, Andrea Jedele, Desa Jelavic Malenica, Tobias Jenegger, Håkan T. Johansson, Björn Jonson, Julian Kahlbow, Nasser Kalantar-Nayestanaki, Armel Kamenyero, Kafa Khasawneh, Oleg Kiselev, Philipp Klenze, Marco Knösel, Karsten Koch, Marvin Kohls, Daniel Körper, Thorsten Kröll, Sabina Krasilovskaja, Dmytro Kresan, Deniz Kurtulgil, Nikolaus Kurz, Bastian Löher, Christoph Langer, Claudia Lederer-Woods, Christopher Lehr, Yuri A Litvinov, Enis Lorenz, Nunzia Simona Martorana, Tohru Motobayashi, Silvia Murillo Morales, Enrique Nacher, Thomas Nilsson, Emanuele Vincenzo Pagano, Valerii Panin, Joochun Park, Stefanos Paschalis, Angel Perea, Marina Petri, Sara Pirrone, Ralf Plag, Lukas Ponnath, Romana Popočovski, Markus Reich, Han-Bum Rhee, Jose Luis Rodriguez Sanchez, Dominic Rossi, Paolo Russotto, Ángel-Miguel Sánchez-Benítez, Christian Sürder, Deniz Savran, Heiko Scheit, Konrad Schmidt, Hendrik Schulte, Haik Simon, Johannes Simon, Viktor Starostin, Sonja Storck-Dutine, Hans Toshihide Törnqvist, Junki Tanaka, Olof Tengblad, Benedikt Thomas, Marina Trimarchi, Stefan Typel, László Varga, Klaus Volk, Meiko Volknandt, Vadim Wagner, Felix Wamers, Mario Weigand, and Lorenzo Zanetti
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General Medicine - Abstract
We measured the Coulomb dissociation of 16O into 4He and 12C within the FAIR Phase-0 program at GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, Germany. From this we will extract the photon dissociation cross section 16O(α,γ)12C, which is the time reversed reaction to 12C(α,γ)16O. With this indirect method, we aim to improve on the accuracy of the experimental data at lower energies than measured so far. The expected low cross section for the Coulomb dissociation reaction and close magnetic rigidity of beam and fragments demand a high precision measurement. Hence, new detector systems were built and radical changes to the R3B setup were necessary to cope with the high-intensity 16O beam. All tracking detectors were designed to let the unreacted 16O ions pass, while detecting the 12C and 4He.
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- 2023
3. Neutron capture cross sections of light neutron-rich nuclei relevant for r-process nucleosynthesis
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M. Heine, Th. Kröll, S. Chakraborty, Rene Reifarth, Stefan Typel, P. Díaz Fernández, D. M. Rossi, Ushasi Datta, Marielle Chartier, Ralf Plag, J. Marganiec, A. Bhattacharyya, Catherine Rigollet, Christoph Langer, V. Panin, M. V. Ricciardi, C. Nociforo, P. Das, R. Krücken, Yvonne Leifels, S. Beceiro-Novo, Herbert A. Simon, Anisur Rahaman, C. Caesar, H. Geissel, J. S. Winfield, Andreas Wagner, Nasser Kalantar-Nayestanaki, Björn Jonson, H. Emling, T. Le Bleis, W. N. Catford, Thomas Aumann, D. Cortina-Gil, Stefanos Paschalis, Yasuhiro Togano, G. Münzenberg, Yutaka Utsuno, C. Scheidenberger, Helmut Weick, Håkan T Johansson, H. Scheit, D. González-Díaz, J. Kurcewicz, K. Boretzky, G. De. Angelis, B. V. Carlson, Thomas Nilsson, F. Wamers, Nuclear Energy, Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
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Physics ,Neutron capture ,010308 nuclear & particles physics ,Nuclear Theory ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,7. Clean energy ,r-process nucleosynthesis ,Dissociation (chemistry) ,Nuclear physics ,Reaction rate ,Nucleosynthesis ,neutron-rich nuclei ,0103 physical sciences ,Neutron cross section ,r-process ,Neutron ,Hauser-Feshbach ,010306 general physics ,Ground state ,Nuclear Experiment - Abstract
International audience; The measurements of neutron capture cross sections of neutron-rich nuclei are challenging but essential for understanding nucleosynthesis and stellar evolution processes in the explosive burning scenario. In the quest of r-process abundances, according to the neutrino-driven-wind model, light neutron-rich unstable nuclei may play a significant role as seed nuclei that influence the abundance pattern. Hence, experimental data for neutron capture cross sections of neutron-rich nuclei are needed. Coulomb dissociation of radioactive ion beams at intermediate energy is a powerful indirect method for inferring capture cross section. As a test case for validation of the indirect method, the neutron capture cross section (n, γ) for C14 was inferred from the Coulomb dissociation of C15 at intermediate energy (600A MeV). A comparison between different theoretical approaches and experimental results for the reaction is discussed. We report for the first time experimental reaction cross sections of Na28(n,γ)Na29, Na29(n,γ)Na30, Mg32(n,γ)Mg33, and Al34(n,γ)Al35. The reaction cross sections were inferred indirectly through Coulomb dissociation of Na29,30, Mg33, and Al35 at incident projectile energies around 400–430 A MeV using the FRS-LAND setup at GSI, Darmstadt. The neutron capture cross sections were obtained from the photoabsorption cross sections with the aid of the detailed balance theorem. The reaction rates for the neutron-rich Na, Mg, Al nuclei at typical r-process temperatures were obtained from the measured (n,γ) capture cross sections. The measured neutron capture reaction rates of the neutron-rich nuclei, Na28, Na29, and Al34 are significantly lower than those predicted by the Hauser-Feshbach decay model. A similar trend was observed earlier for C17 and N19 but in the case of C14(n,γ)C15 the trend is opposite. The situation is more complicated when the ground state has a multi-particle-hole configuration. For Mg32, the measured cross section is about 40–90% higher than the Hauser-Feshbach prediction.
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- 2021
4. Exotic nuclei
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Björn Jonson
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Cultural Studies ,Multidisciplinary ,Political Science and International Relations ,Nuclear Theory ,Physics::Accelerator Physics ,Nuclear Experiment - Abstract
One of the most interesting and intensively examined research directions in nuclear physics, i.e., the production and investigation of exotic nuclei in the vicinity of drip-lines is investigated. An historical overview of the development of research area is provided. Methods to produce such nuclei realized at the foremost research facilities in the world, e.g., CERN in Switzerland and GSI in Germany, are described. The critical change of the nuclear structure on approaching proton and neutron drip-lines, as well as the results of experimental studies of neutron- and proton-rich nuclei, the mechanism of neutron halo formation in neutron-rich isotopes of helium, lithium, beryllium, and boron, are discussed. In addition, medical applications of radioactive beams are discussed briefly.
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- 2019
5. Probing proton halo effects in the 8B+64Zn collision around the Coulomb barrier
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Björn Jonson, L. M. Fraile, A. M. Sánchez-Benítez, Roberta Spartà, Neven Soić, J. Cederkäll, M. J. G. Borge, A. Di Pietro, J. D. Ovejas, J. Halkjaer Jensen, Olof Tengblad, A. M. Moro, J. P. Fernández-García, G. Bruni, Ismael Martel, D. Galaviz, Ángel Perea, Jin Lei, Thomas Davinson, Luis Acosta, S. Vinals, M. La Cognata, P. Figuera, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE), Istituto Nazionale di Fisica Nucleare (INFN) Italia, Science and Technology Facilities Council (STFC) Reino Unido, European Commission, Istituto Nazionale di Fisica Nucleare, and Ministerio de Ciencia, Innovación y Universidades (España)
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Physics ,Elastic scattering ,Nuclear and High Energy Physics ,Range (particle radiation) ,Proton ,Breakup ,010308 nuclear & particles physics ,QC1-999 ,Coulomb barrier ,Halo nucleus ,01 natural sciences ,7. Clean energy ,Molecular physics ,0103 physical sciences ,Halo nuclei ,Coulomb ,Neutron ,Nuclear Physics - Experiment ,Física nuclear ,Halo ,010306 general physics ,Nuclear Experiment - Abstract
Proton halo effects in the 8B+64Zn reaction at an energy around 1.5 times the Coulomb barrier have been studied at HIE-ISOLDE CERN using, for the first time, the only existing postaccelerated 8B beam. This, together with the use of a high granularity and large solid angle detection system, allowed for a careful mapping of the elastic angular distribution, especially in the Coulomb-nuclear interference region. Contrary to what is observed for the one-neutron halo nucleus 11Be on the same target in a similar energy range, the analysis of the elastic scattering angular distribution shows only a modest suppression of the Coulomb-nuclear interference peak, with no remarkable enhancement of the total reaction cross-section. Inclusive angular and energy distributions of 7Be produced in direct reaction processes have also been measured. The comparison of these data with the results of theoretical calculations for the elastic and non-elastic breakup contributions indicate that both processes are important. Overall, the experimental data suggest a 8B collision dynamics at the barrier very different from the one of neutron halo nuclei, showing only modest effects of coupling to continuum. This behaviour can be interpreted as due to the presence of the additional Coulomb interactions halo-core and halo-target together with the presence of the centrifugal barrier felt by the valence proton of 8B., We wish to thank Dr. A. Bonaccorso for useful discussions and suggestions. This work has been supported by the European Commission Horizon 2020 framework trans-national access program of the EU project ENSAR2 (Grant no. 654002). Some of us acknowledge the support of the Istituto Nazionale di Fisica Nucleare (INFN), the UKRI STFC and the Spanish Funding Agency under the projects: “ELEGANT” PGC2018-095640-B-100, FIS2017-88410-P, PDI2019- 104390GB-100, FPA2016-77689-C2-1-R, PGC2018-096994-B-C21, PGC2018-096994-B-C22, RTI2018-098868-B-I00. L.A. is partially supported by DGAPA PAPIIT-IN107820 and CONACYT 314857. L.M.F is partially supported by the CERN associates program. D.G. is supported by the Portuguese FCT under the project CERN/FISPAR/0005/2017
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- 2021
6. NeuLAND: The high-resolution neutron time-of-flight spectrometer for R3B at FAIR
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M.I. Cherciu, N.G. Kozlenko, Andreas Martin Heinz, P. Russotto, Christoph Langer, Z. Elekes, Nasser Kalantar-Nayestanaki, G. Ickert, Thomas Aumann, Thomas Nilsson, L. Zanetti, M. Volknandt, E. M. Orischin, Heiko Scheit, K. Koch, E.V. Pagano, V. Kuznetsov, S. Chakraborty, U. Datta, V. L. Golovtsov, N. Kurz, E. Hoemann, Tanja Heftrich, S. S. Volkov, J. Dreyer, M. Kempe, D. M. Rossi, T. Hensel, A. Horvat, C. Caesar, V. Wagner, G. Politi, I. Lihtar, F. Schindler, B. Löher, Ahibur Rahaman, Catherine Rigollet, J. Kahlbow, H. Törnqvist, A. Kelic-Heil, Herbert A. Simon, Daniel Stach, E. De Filippo, D. Galaviz, N. S. Martorana, Daniel Bemmerer, D. Gonzalez Diaz, D. Körper, Jorge Machado, E. Stan, B. Gnoffo, L. V. Chulkov, P. Teubig, N. Gruzinsky, J. Mayer, G. Alkhazov, J. Hehner, Rene Reifarth, S. Wranne, S. Pirrone, Håkan T Johansson, K. Miki, Lukas Bott, E. Geraci, K. Boretzky, I. Gašparić, H. Heggen, D. Kresan, M. Trimarchi, Kathrin Göbel, D. Jelavić Malenica, J. Stomvall Gill, S.V. Bondarev, M. Holl, Andreas Zilges, D. Yakorev, Joachim Enders, L. Atar, P.-M. Potlog, L. Uvarov, Björn Jonson, Andreas Wagner, Matthias Heil, M. Ciobanu, Á. Horváth, A.G. Krivshich, M. Röder, C.A. Douma, Y. Leifels, Deniz Savran, Kai Zuber, Research unit Nuclear & Hadron Physics, and Nuclear Energy
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Physics ,Nuclear and High Energy Physics ,Spectrometer ,business.industry ,High-energy neutron detection ,Reactions with relativistic radioactive beams ,Plastic scintillator array ,Multi-neutron detection ,Detector ,Scintillator ,Time of flight ,Optics ,Neutron detection ,Facility for Antiproton and Ion Research ,Neutron ,ddc:530 ,Nuclear Experiment ,business ,Instrumentation ,Image resolution - Abstract
Nuclear instruments & methods in physics research / A 1014, 165701 (2021). doi:10.1016/j.nima.2021.165701, Published by North-Holland Publ. Co., Amsterdam
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- 2021
7. Tidal Volume Lowering by Instrumental Dead Space Reduction in Brain-Injured ARDS Patients: Effects on Respiratory Mechanics, Gas Exchange, and Cerebral Hemodynamics
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Sonia D'Arrigo, Maria Teresa Santantonio, Pierluigi Di Giannatale, Massimo Antonelli, Davide Eleuteri, Alessandro Ferrieri, Salvatore Maurizio Maggiore, Björn Jonson, Daniele Natalini, Sara Pitoni, Domenico Luca Grieco, and Francesco Idone
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medicine.medical_specialty ,ARDS ,Mean arterial pressure ,medicine.medical_treatment ,Dead space ,Brain injury ,Mechanical ventilation ,Protective ventilation ,Ventilator-induced lung injury ,Critical Care and Intensive Care Medicine ,03 medical and health sciences ,Plateau pressure ,0302 clinical medicine ,Internal medicine ,Settore MED/41 - ANESTESIOLOGIA ,medicine ,Tidal Volume ,Humans ,Cerebral perfusion pressure ,Tidal volume ,Intracranial pressure ,Respiratory Distress Syndrome ,business.industry ,Hemodynamics ,Brain ,030208 emergency & critical care medicine ,medicine.disease ,Respiration, Artificial ,Cardiology ,Respiratory Mechanics ,Neurology (clinical) ,business ,030217 neurology & neurosurgery ,Original Work - Abstract
Background Limiting tidal volume (VT), plateau pressure, and driving pressure is essential during the acute respiratory distress syndrome (ARDS), but may be challenging when brain injury coexists due to the risk of hypercapnia. Because lowering dead space enhances CO2 clearance, we conducted a study to determine whether and to what extent replacing heat and moisture exchangers (HME) with heated humidifiers (HH) facilitate safe VT lowering in brain-injured patients with ARDS. Methods Brain-injured patients (head trauma or spontaneous cerebral hemorrhage with Glasgow Coma Scale at admission
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- 2020
8. Letter to editor
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Marika Bajc and Björn Jonson
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Perfusion ,Tomography, Emission-Computed, Single-Photon ,Respiration ,Humans ,Radiology, Nuclear Medicine and imaging ,General Medicine ,Pulmonary Embolism ,Lung - Published
- 2020
9. Search for beta-delayed proton emission from 11 Be
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M. V. Lund, Johannes Lachner, Silke Merchel, E. Nacher, V. Vedia, Thomas Nilsson, Miguel Madurga, Olof Tengblad, M. Carmona-Gallardo, J. A. Briz, H. O. U. Fynbo, A. Garzon Camacho, K. Riisager, Peter Steier, María José García Borge, O. Forstner, J. G. Johansen, Björn Jonson, L. M. Fraile, European Commission, Ministerio de Economía y Competitividad (España), and Danish Council for Independent Research
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Physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,010308 nuclear & particles physics ,Branching fraction ,FOS: Physical sciences ,nucl-ex ,7. Clean energy ,01 natural sciences ,Ion source ,Ion ,Nuclear physics ,TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY ,0103 physical sciences ,Nuclear Physics - Experiment ,Física nuclear ,Proton emission ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Accelerator mass spectrometry - Abstract
8 pags., 4 figs., 4 tabs., We report on an attempt to reproduce the observation of β-delayed proton emission from Be through detection of the final state nucleus Be with accelerator mass spectrometry. Twelve samples were collected at the ISOLDE facility at CERN at different separator settings, allowing tests of different sources of contamination to be carried out. The observed amounts of Be per collected Be rule out several contamination sources, but do not agree internally. Formation of BeH molecular ions in the ion source may explain our data, in which case an upper limit of the βp branching ratio of 2.2 × 10 can be derived., We would like to acknowledge support from the European Union’s Horizon 2020 research and innovation programme under Grant agreement no. 654002, from the Spanish research projects FPA2015-64969- P, FPA2015-65035-P and FPA2017-87568-P (MINECO/FEDER, UE), and from the Danish Council for Independent Research (DFF-4181- 00218).
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- 2020
10. The experiments to determine the electron capture and ß-decay of 8B into the highly excited states of 8Be
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S. Smain, H. O. U. Fynbo, Olof Tengblad, Thomas Nilsson, J. D. Ovejas, K. Riisager, A. Gad, P. Figuera, C. Sotty, Jesper Hasseriis Mohr Jensen, I. Marroquin, S. Vinals, Enrique Nácher, Björn Jonson, M. Munch, R. Lica, María José García Borge, L. M. Fraile, J. Benito, Ángel Perea, Ministerio de Economía y Competitividad (España), and European Commission
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Physics ,History ,Work (thermodynamics) ,010308 nuclear & particles physics ,Electron capture ,Branching fraction ,01 natural sciences ,3. Good health ,Computer Science Applications ,Education ,Nuclear physics ,Isospin ,Excited state ,0103 physical sciences ,Energy level ,Física nuclear ,Nuclear Physics - Experiment ,Limit (mathematics) ,010306 general physics ,Mixing (physics) - Abstract
6 pags., 6 figs. -- 27th International Nuclear Physics Conference (INPC2019) 29 July - 2 August 2019, Glasgow, UK, The main goal of this work is to study the structure of the highest energy states in 8Be populated following the ß+-decay and the electron capture (EC) of 8B. With this aim, two experiments were performed at ISOLDE-CERN in 2017 and 2018. The first experiment had the aim to resolve the 2+ doublet at 16.6 and 16.9 MeV, in order to study their isospin mixing. The second experiment aimed to determine a value or give an experimental upper limit to the branching ratio of the exotic EC-p decay. In this paper, we present the experimental setups and we discuss the analysis and present the preliminary results obtained so far., Work partially supported by the Spanish research grant FPA2015-64969-P and FPA2017-87568- P (MINECO) and the grant ENSAR2 from the H2020 program of the European Union under grant agreement No 654002.
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- 2020
11. Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions
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A. Henriques, J. S. Winfield, Thomas Nilsson, Rene Reifarth, M. Heine, E. Cravo, L. M. Fraile, Håkan T Johansson, O. Sorlin, L. Chulkov, W. N. Catford, A. Revel, J. Marganiec-Gałązka, Pavel Golubev, H. Scheit, S. Beceiro-Novo, Joakim Cederkäll, R. Gernhäuser, Carlos A. Bertulani, Y. Togano, T. Le Bleis, D. Cortina-Gil, L. Atar, G. L. Wilson, S. Pietri, F. Farinon, Kai Zuber, N. Kurz, Andreas Zilges, V. Volkov, M. Heil, C. Langer, A. Kelic-Heil, R. Plag, Catherine Rigollet, J. Enders, Iris Dillmann, U. Datta Pramanik, Jorge Machado, H. Alvarez-Pol, I. Syndikus, A. O. Macchiavelli, Marina Petri, D. Yakorev, M. Holl, Enrique Casarejos, G. Ribeiro, Mikhail V. Zhukov, Stefanos Paschalis, María José García Borge, Marine Vandebrouck, Deniz Savran, V. Panin, Björn Jonson, Nasser Kalantar-Nayestanaki, Philip Woods, Ángel Perea, C. Wheldon, R. Crespo, Thomas Aumann, Hans Geissel, Z. Elekes, Andreas Martin Heinz, J. M. Boillos, B. A. Brown, D. Galaviz, T. Kröll, S. Chakraborty, K. Göbel, Enrique Nácher, H. Weick, Rituparna Kanungo, P. Díaz Fernández, K. Boretzky, M. Caamaño, Anisur Rahaman, C. Caesar, J. Benlliure, F. Wamers, D. Rossi, Haik Simon, Olof Tengblad, C. Nociforo, Institut Pluridisciplinaire Hubert Curien (IPHC), 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), 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), R$^3$B, Energy and Sustainability Research Institute Groni, Research unit Nuclear & Hadron Physics, Royal Society (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), State of Hesse, Technische Universität Darmstadt, Helmholtz Association, European Young Investigator Awards, Swedish Research Council, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Xunta de Galicia, German Research Foundation, National Science Foundation (US), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)
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Nuclear and High Energy Physics ,Quasi-free scattering reactions ,Field (physics) ,Proton ,Nuclear Theory ,Shell (structure) ,FOS: Physical sciences ,Shell evolution ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Atomic ,Nuclear physics ,Magic number (programming) ,Particle and Plasma Physics ,0103 physical sciences ,Neutron ,Nuclear ,ddc:530 ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Mathematical Physics ,Spin-½ ,Physics ,010308 nuclear & particles physics ,Scattering ,Molecular ,Spin-orbit splitting ,Nuclear & Particles Physics ,lcsh:QC1-999 ,3. Good health ,Valley of stability ,Tensor force ,Magic numbers ,Física nuclear ,lcsh:Physics ,Astronomical and Space Sciences ,Exotic nuclei - Abstract
9 pags., 5 figs., 2 tabs., The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z=6 spin-orbit shell gap towards the neutron dripline. To do so, we employed NA(p,2p)CA−1 quasi-free scattering reactions to measure the proton component of the 2 state of C. The experimental findings support the notion of a moderate reduction of the proton 1p−1p spin-orbit splitting, at variance to recent claims for a prevalent Z=6 magic number towards the neutron dripline., This work was supported by the Royal Society award UF150476, UK STFC awards ST/M006433/1 and ST/P003885/1, U.S. Department of Energy, Office of Nuclear Physics, contract No. DE-AC02- 05CH11231 (LBNL), the German Federal Ministry of Education and Research (BMBF projects 05P15RDFN1, 05P15WOFNA and 05P19RDFN1), the GSI-TU Darmstadt cooperation agreement, the State of Hesse through the LOEWE center HIC for FAIR, the Helmholtz-Gemeinschaft through the graduate school HGS-HIRe and Young Investigators Grants, and the Swedish Research Council under contract number 621-2011-5324. This work was also supported by the Spanish research grants (Ministerio Ciencia e Innovación), FPA2015-64969-P, FPA2015-69640-C2-1-P, FPA2017- 87568-P, PGC2018-099746-B-C21, RTI2018-098868-B-I00, Undidad de Excelencia María de Maeztu under project MDM-2016.0692, and the Xunta de Galicia research grant GRC ED431C 2017/54. This work was partly supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245. C.A.B. acknowledges support from the U.S. NSF Grant No. 1415656, and U.S. DOE Grant No. DE-FG02-08ER41533.
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- 2020
12. The most accurate determination of the 8B half-life
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C. Sotty, I. Marroquin, Thomas Nilsson, S. Vinals, K. Riisager, J. D. Ovejas, H. O. U. Fynbo, Olof Tengblad, S. Smain, Jesper Hasseriis Mohr Jensen, P. Figuera, Enrique Nácher, R. Lica, María José García Borge, Ángel Perea, J. Benito, A. Gad, L. M. Fraile, Björn Jonson, M. Munch, Ministerio de Economía y Competitividad (España), and European Commission
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Physics ,010308 nuclear & particles physics ,General Physics and Astronomy ,Half-life ,Value (computer science) ,01 natural sciences ,Beta decay ,Measure (mathematics) ,Computational physics ,medicine.anatomical_structure ,0103 physical sciences ,medicine ,Nuclear Physics - Experiment ,Física nuclear ,010306 general physics ,Nucleus - Abstract
7 pags., 4 figs. -- Presented at the XXXVI Mazurian Lakes Conference on Physics, Piaski, Poland, September 1–7, 2019., Beta decay is a primary source of information of the structure of a nucleus. An accurate measurement of the half-life of a nucleus is essential for the proper determination of the reduced Gammow-Teller transition probability B(GT). In this work, we present an experiment using a compact set-up of Si-telescope detectors to measure the half-life of the B nucleus. Three independent measurements have been analysed, obtaining the values 771.9(17) ms, 773.9(18) ms, and 770.9(27) ms. The value of the half-life obtained as the weighted averaged with the previous published measures is 771.17(94) ms which is a factor 3.2 of improvement in the uncertainty of the half-life., Work partially supported by the Spanish research grant FPA2015-64969-P, FPA2017-83946-C2-1-P and FPA2017-87568-P (MINECO/FEDER/EU) and the grant ENSAR2 from the H2020 program of the European Union under grant agreement No. 654002.
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- 2020
13. EANM guideline for ventilation/perfusion single-photon emission computed tomography (SPECT) for diagnosis of pulmonary embolism and beyond
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Hein J. Verberne, Thomas Grüning, Roberto C. Delgado Bolton, Brian Neilly, Pierre-Yves Le Roux, Ralf W. Bauer, Marika Bajc, Adriano Alatri, Mirza Dilic, Ari Lindqvist, Carl Schümichen, Björn Jonson, HUS Heart and Lung Center, Department of Medicine, Keuhkosairauksien yksikkö, Radiology and Nuclear Medicine, and ACS - Amsterdam Cardiovascular Sciences
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DUAL-ENERGY CT ,PERFUSION SCINTIGRAPHY ,ACUTE KIDNEY INJURY ,Single-photon emission computed tomography ,Guidelines ,Ventilation/perfusion ratio ,Chronic pulmonary embolism ,030218 nuclear medicine & medical imaging ,Pulmonary hypertension ,03 medical and health sciences ,0302 clinical medicine ,P SPECT ,ASSESSING CLINICAL PROBABILITY ,medicine ,Ventilation-perfusion ,IODINE-INDUCED HYPERTHYROIDISM ,COPD ,Radiology, Nuclear Medicine and imaging ,CTPA ,DEEP-VEIN THROMBOSIS ,Lung ,medicine.diagnostic_test ,Left heart failure ,business.industry ,Pulmonary embolism ,General Medicine ,Pneumonia ,medicine.disease ,3126 Surgery, anesthesiology, intensive care, radiology ,EMERGENCY-DEPARTMENT ,3. Good health ,medicine.anatomical_structure ,030220 oncology & carcinogenesis ,Heart failure ,SPECT ,V/Q SPECT ,RULE-OUT CRITERIA ,Nuclear medicine ,business ,V/P SPECT/CT ,AMERICAN THORACIC SOCIETY/SOCIETY ,CT - Abstract
These guidelines update the previous EANM 2009 guidelines on the diagnosis of pulmonary embolism (PE). Relevant new aspects are related to (a) quantification of PE and other ventilation/perfusion defects; (b) follow-up of patients with PE; (c) chronic PE; and (d) description of additional pulmonary physiological changes leading to diagnoses of left ventricular heart failure (HF), chronic obstructive pulmonary disease (COPD) and pneumonia. The diagnosis of PE should be reported when a mismatch of one segment or two subsegments is found. For ventilation, Technegas or krypton gas is preferred over diethylene triamine pentaacetic acid (DTPA) in patients with COPD. Tomographic imaging with V/P-SPECT has higher sensitivity and specificity for PE compared with planar imaging. Absence of contraindications makes V/P-SPECT an essential method for the diagnosis of PE. When V/P-SPECT is combined with a low-dose CT, the specificity of the test can be further improved, especially in patients with other lung diseases. Pitfalls in V/P-SPECT interpretation are discussed. In conclusion, V/P-SPECT is strongly recommended as it accurately establishes the diagnosis of PE even in the presence of diseases like COPD, HF and pneumonia and has no contraindications.
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- 2019
14. Coulomb dissociation of $^{16}$O into $^{4}$He and $^{12}$C
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Markus Reich, Zsolt Fülöp, Ralf Plag, J. Benlliure, D. Cortina-Gil, Marcel Heine, T. Kröll, H. Törnqvist, A. Kelic-Heil, Kafa Khasawneh, B. Thomas, Tanja Heftrich, Joochun Park, O. Kiselev, Håkan T Johansson, Haik Simon, Tahani Almusidi, Olof Tengblad, Christopher Lehr, Ángel Perea, Lukas Ponnath, Thomas Nilsson, H. Alvarez-Pol, Sonja Storck, C. Caesar, Junki Tanaka, Heiko Scheit, Bastian Löher, Z. Slavkovská, M. Volknandt, rey Danilov, Konrad Schmidt, Sonia Escribano Rodriguez, Rene Reifarth, Isabell Deuter, Enrique Casarejos, T. Hensel, Deniz Kurtulgil, Liam Atkins, Anna-Lena Hartig, Lukas Bott, B. Brückner, Armel Kamenyero, Silvia Murillo Morales, Yuri A. Litvinov, S. Fiebiger, Jan Glorius, Matthias Holl, Igor Gašparić, Hendrik Schulte, Romana Popocovski, Enis Lorenz, José L. Sánchez, Stefan Typel, V. Wagner, Viktor Starostin, Stefanos Paschalis, Deniz Savran, David Gonzales Caamaño, Leonard Brandenburg, Daniel Körper, Felix Wamers, Ashton Falduto, Christoph Langer, Björn Jonson, Christian Sürder, María José García Borge, P. Erbacher, László Varga, N. Kurz, Philipp Klenze, Dmytro Kresan, Klaus Volk, Alexander Grein, Marvin Kohls, Kathrin Göbel, Pablo Cabanelas Eiras, Han-Bum Rhee, Roman Gernhäuser, Lorenzo Zanetti, Daniel Bemmerer, Konstanze Boretzky, Enrique Nácher, reas Heinz, D. M. Rossi, Leonid Chulkov, Mario Weigand, Joakim Cederkäll, Michael Heil, Nasser Kalantar-Nayestanaki, Marina Petri, Thomas Aumann, Henning Heggen, Institut Pluridisciplinaire Hubert Curien (IPHC), 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), 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), Energy and Sustainability Research Institute Groni, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), and Croatian Science Foundation
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Paper ,History ,Scintillator ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,7. Clean energy ,Dissociation (chemistry) ,Education ,Ion ,Nuclear physics ,nucleosynthesis ,12C(α, γ)16O ,Coulomb dissociation ,R3B setup ,TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY ,0103 physical sciences ,Coulomb ,Nuclear fusion ,ddc:530 ,010306 general physics ,Physics ,010308 nuclear & particles physics ,Scattering ,Charge number ,ddc ,Computer Science Applications ,Nucleon - Abstract
8 pags., 3 figs., We measured the Coulomb dissociation of 16O into 4He and 12C at the R3B setup in a first campaign within FAIR Phase 0 at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. The goal was to improve the accuracy of the experimental data for the 12C(α,γ)16O fusion reaction and to reach lower center-ofmass energies than measured so far. The experiment required beam intensities of 109 16O ions per second at an energy of 500 MeV/nucleon. The rare case of Coulomb breakup into 12C and 4He posed another challenge: The magnetic rigidities of the particles are so close because of the same mass-to-charge-number ratio A/Z = 2 for 16O, 12C and 4He. Hence, radical changes of the R3B setup were necessary. All detectors had slits to allow the passage of the unreacted 16O ions, while 4He and 12C would hit the detectors’ active areas depending on the scattering angle and their relative energies. We developed and built detectors based on organic scintillators to track and identify the reaction products with sufficient precision., This project was carried out within FAIR Phase 0 at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. This project was supported by the Bundesministerium für Bildung und Forschung (BMBF) (05P19RFFN1, 05P15RFFN1, 05P15RDFN1), HGS-HIRE, HIC for FAIR and the GSI-TU Darmstadt cooperation agreement. I. Gašparić and R. Popočovski have been supported by the Croatian Science Foundation under projects no. 1257 and 7194.
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- 2019
15. Halo Effects in the Low-energy Scattering of $^{15}$C with Heavy Targets
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Ángel Perea, Miguel Madurga, P. Teubig, N. Keeley, A. Knyazev, A.A. Arokiaraj, A. Di Pietro, D. Galaviz, N. Ceylan, H. O. U. Fynbo, O. Sgouros, Olof Tengblad, T. Cap, Björn Jonson, M. Munch, R. Honório, M. Babo, S. Vinals, G. Marquínez-Durán, A. Pakou, T. Pérez, Ismael Martel, V. Soukeras, T. Kurtukian, Riccardo Raabe, María José García Borge, J. Cederkäll, L. M. Fraile, J. Fernandez, G. de Angelis, M. Renaud, C. García-Ramos, R. Wolski, K. Rusek, K. Riisager, P. Figuera, J. Yang, Jesper Hasseriis Mohr Jensen, L. Acosta, Rubina Kotak, Jose Sanchez-Segovia, M. Wolinska-Cichocka, J. D. Ovejas, A. K. Ordúz, Luis Peralta, A. M. Sánchez-Benítez, 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), 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), 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), 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), European Organization for Nuclear Research, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), and European Commission
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[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,Physics, Multidisciplinary ,Nuclear Theory ,General Physics and Astronomy ,Coulomb barrier ,Halo nucleus ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,7. Clean energy ,CROSS-SECTIONS ,Nuclear physics ,Cross section (physics) ,Low-energy scattering ,0103 physical sciences ,Neutron ,010306 general physics ,Nuclear Experiment ,Physics ,Science & Technology ,010308 nuclear & particles physics ,Scattering ,Carbon isotope ,Halo effects ,Breakup ,13. Climate action ,Physical Sciences ,15 C ,Halo ,Ground state - Abstract
6 pags., 3 figs. -- Presented at the XXXVI Mazurian Lakes Conference on Physics, Piaski, Poland, September 1–7, 2019, The neutron-rich carbon isotope C was postulated to be a halo nucleus (S = 1215 keV, S = 9395 keV) according to different high-energy experiments. If so, it would be the only halo nucleus exhibiting a "pure" s-wave structure of the ground state. At low collision energies, the effect of this halo structure should manifest as a strong absorption pattern in the angular distribution of the elastic cross section, with a total suppression of the nuclear rainbow due to the large neutron transfer and breakup probabilities, enhanced by the halo configuration. The IS619 experiment, carried out at the HIE-ISOLDE facility at CERN (Switzerland), is the first dynamical study of this nucleus at energies around the Coulomb barrier. It aims to probe the halo structure via the measurement of the elastic cross section on a high-Z Pb target. Preliminary results of the elastic cross section are discussed and compared to Optical Model calculations., I. Martel and O. Tengblad, as spokespersons, are grateful to the IS619 Collaboration and to the HIE-ISOLDE team for delivering the radioactive beam. J.D. Ovejas is grateful to AEI/FEDER/EU for the Ph.D. fellowship BES2016-077059. Work partially supported by the Spanish research grants FPA2015-64969-P, FPA2017-87568-P (both AEI/FEDER/EU), PGC 2018- 095640-B-I00 and ENSAR2 from EU H2020 under contract number 654002.
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- 2019
16. All the fun of the FAIR: fundamental physics at the facility for antiproton and ion research
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K. Langanke, E. Nappi, Th. Stöhlker, Ulf-G. Meißner, Thomas Nilsson, V. Koch, Paul Indelicato, Eberhard Widmann, Marco Durante, Michael Wiescher, Björn Jonson, Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Collège de France (CdF)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
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Research program ,General Physics ,medicine ,Nuclear Theory ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,Atomic Physics (physics.atom-ph) ,FOS: Physical sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Mathematical Sciences ,010305 fluids & plasmas ,High Energy Physics - Experiment ,Physics - Atomic Physics ,Nuclear Theory (nucl-th) ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,nuclear physics ,0103 physical sciences ,Nuclear astrophysics ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,ddc:530 ,Instrumentation (computer programming) ,Darmstadt GSI FAIR ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Mathematical Physics ,plasma ,Physics ,astrophysics ,Suite ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,heavy ion ,[PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph] ,anti-p ,High Energy Physics - Phenomenology ,experimental equipment ,atomic physics ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Fundamental physics ,Physical Sciences ,Systems engineering ,Facility for Antiproton and Ion Research ,hadron ,ion ,Space Science ,Applied science - Abstract
The Facility for Antiproton and Ion Research (FAIR) will be the accelerator-based flagship research facility in many basic sciences and their applications in Europe for the coming decades. FAIR will open up unprecedented research opportunities in hadron and nuclear physics, in atomic physics and nuclear astrophysics as well as in applied sciences like materials research, plasma physics and radiation biophysics with applications towards novel medical treatments and space science. FAIR is currently under construction as an international facility at the campus of the GSI Helmholtzzentrum for Heavy-Ion Research in Darmstadt, Germany. While the full science potential of FAIR can only be harvested once the new suite of accelerators and storage rings is completed and operational, some of the experimental detectors and instrumentation are already available and will be used starting in summer 2018 in a dedicated research program at GSI, exploiting also the significantly upgraded GSI accelerator chain. The current manuscript summarizes how FAIR will advance our knowledge in various research fields ranging from a deeper understanding of the fundamental interactions and symmetries in Nature to a better understanding of the evolution of the Universe and the objects within., invited comment, published in Physica Scripta 94 (2019) 033001
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- 2019
17. Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range
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P. J. Woods, Matthias Heil, K. Boretzky, W. N. Catford, A. Henriques, M. Caamaño, Thomas Nilsson, J. Benlliure, P. Velho, Yasuhiro Togano, F. Wamers, I. Syndikus, E. Cravo, H. Alvarez-Pol, Joachim Enders, N. Kurz, O. Sorlin, Rituparna Kanungo, Deniz Savran, C. Nociforo, Mikhail V. Zhukov, L. M. Fraile, Marine Vandebrouck, Björn Jonson, M. Heine, Haik Simon, Roman Gernhäuser, Olof Tengblad, M. Holl, Z. Elekes, M. A. Najafi, Heiko Scheit, Carlos A. Bertulani, Kai Zuber, J. S. Winfield, T. Le Bleis, D. Cortina-Gil, L. Atar, Enrique Casarejos, Joakim Cederkäll, T. Kröll, C. Caesar, G. L. Wilson, G. Ribeiro, A. Kelic-Heil, Christoph Langer, Nasser Kalantar-Nayestanaki, Helmut Weick, Håkan T Johansson, Pavel Golubev, C. Wheldon, Thomas Aumann, Andreas Martin Heinz, Stefanos Paschalis, P. Díaz Fernández, D. M. Rossi, Enrique Nácher, Simon Lindberg, Catherine Rigollet, S. Beceiro-Novo, J. M. Boillos, L. V. Chulkov, Tanja Heftrich, V. Panin, D. Galaviz Redondo, Jorge Machado, Marina Petri, Rene Reifarth, Iris Dillmann, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), R3B, Federal Ministry of Education and Research (Germany), Technische Universität Darmstadt, Helmholtz International Center for FAIR, European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía, Industria y Competitividad (España), Swedish Research Council, National Science Foundation (US), Department of Energy (US), Fundação para a Ciência e a Tecnologia (Portugal), LIBPhys-UNL, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), 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), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
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Nuclear and High Energy Physics ,Proton ,3313 Tecnología E Ingeniería Mecánicas ,media_common.quotation_subject ,Nuclear Theory ,Aucun ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,7. Clean energy ,01 natural sciences ,Asymmetry ,Nuclear physics ,Momentum ,Shell model ,0103 physical sciences ,Neutron ,ddc:530 ,010306 general physics ,Nuclear Experiment ,Quasi-free scattering ,media_common ,Physics ,Range (particle radiation) ,010308 nuclear & particles physics ,Scattering ,2207 Física Atómica y Nuclear ,lcsh:QC1-999 ,Inverse kinematics ,Isospin ,Física nuclear ,Spectroscopic factors ,Beam (structure) ,lcsh:Physics - Abstract
7 pags., 4 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0, The quasi-free scattering reactions C(p,2p) and C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the RB-LAND setup. The outgoing proton-proton and proton-neutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. The efficiency to detect these pairs has been obtained from GEANT4 simulations which were tested using the C(p,2p) and C(p,pn) reactions. Experimental cross sections and momentum distributions have been obtained and compared to DWIA calculations based on eikonal theory. The new results reported here are combined with previously published cross sections for quasi-free scattering from oxygen and nitrogen isotopes and together they enable a systematic study of the reduction of single-particle strength compared to predictions of the shell model over a wide neutron-to-proton asymmetry range. The combined reduction factors show a weak or no dependence on isospin asymmetry, in contrast to the strong dependency reported in nucleon-removal reactions induced by nuclear targets at lower energies. However, the reduction factors for (p,2p) are found to be 'significantly smaller than for (p,pn) reactions for all investigated nuclei., This work was supported by the German Federal Ministry of Education and Research (BMBF projects 05P2015RDFN1 and 05P15WOFNA), through the GSI-TU Darmstadt cooperation agreement, by the State of Hesse through the LOEWE center HIC for FAIR, and the Helmholtz-Gemeinschaft through the graduate school HGS-HIRe. This work was supported by the European Union by means of the European Commission within its Seventh Framework Program (FP7) via ENSAR (Contract No. 262010), and the Spanish CICYT research grants FPA2012-32443, FPA2015-64969-07387, and FPA2015-69640-C2-1-P. This work has supported by the Swedish Research Council under contract number 621-2011-5324. C.A.B. acknowledges support from the U.S. NSF grant No. 1415656 and the U.S. DOE grant No. DE-FG02-08ER41533. Supported by the Portuguese FCT under the project PTDC/FIS/ 103902/2008.
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- 2019
18. An appropriate inspiratory flow pattern can enhance CO2 exchange, facilitating protective ventilation of healthy lungs
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Louise Walther Sturesson, M. Collryd, Björn Jonson, Gunnar Malmkvist, S. Allvin, and Mikael Bodelsson
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Adult ,Male ,Dead space ,Acute Lung Injury ,intermittent positive pressure ventilation ,Lung injury ,03 medical and health sciences ,0302 clinical medicine ,Capnography ,Tidal Volume ,Humans ,Medicine ,Anesthesia ,Expiration ,Intermittent Positive-Pressure Breathing ,Tidal volume ,Aged ,Lung ,Anesthesiology and Intensive Care ,medicine.diagnostic_test ,Pulmonary Gas Exchange ,business.industry ,030208 emergency & critical care medicine ,Respiratory Dead Space ,Carbon Dioxide ,Middle Aged ,respiratory system ,capnography ,Respiration, Artificial ,Pulmonary Alveoli ,Anesthesiology and Pain Medicine ,medicine.anatomical_structure ,Breath Tests ,030228 respiratory system ,Heat and moisture exchanger ,pulmonary gas exchange ,Breathing ,Female ,Pulmonary Ventilation ,business ,Algorithms - Abstract
Background In acute lung injury, CO 2 exchange is enhanced by prolonging the volume-weighted mean time for fresh gas to mix with resident alveolar gas, denoted mean distribution time (MDT), and by increasing the flow rate immediately before inspiratory flow interruption, end-inspiratory flow (EIF). The objective was to study these effects in human subjects without lung disease and to analyse the results with respect to lung-protective ventilation of healthy lungs. Methods During preparation for intracranial surgery, the lungs of eight subjects were ventilated with a computer-controlled ventilator, allowing breath-by-breath modification of the inspiratory flow pattern. The durations of inspiration ( T I ) and postinspiratory pause ( T P ) were modified, as was the profile of the inspiratory flow wave (i.e. constant, increasing, or decreasing). The single-breath test for CO 2 was used to quantify airway dead space ( V Daw ) and CO 2 exchange. Results A long MDT and a high EIF augment CO 2 elimination by reducing V Daw and promoting mixing of tidal gas with resident alveolar gas. A heat and moisture exchanger had no other effect than enlarging V Daw . A change of T I from 33 to 15% and of T P from 10 to 28%, leaving the time for expiration unchanged, would augment tidal elimination of CO 2 by 14%, allowing a 10% lower tidal volume. Conclusions In anaesthetized human subjects without lung disease, CO 2 exchange is enhanced by a long MDT and a high EIF. A short T I and a long T P allow significant reduction of tidal volume when lung-protective ventilation is required. Clinical trial registration NCT01686984.
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- 2016
19. Exclusive measurements of quasi-free proton scattering reactions in inverse and complete kinematics
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Heiko Scheit, Matthias Heil, T. Le Bleis, D. Cortina-Gil, Roman Gernhäuser, Christoph Langer, Roy Crawford Lemmon, C. Wimmer, Ralf Plag, K. Boretzky, O. Ershova, A. Kelic-Heil, Carlos A. Bertulani, Thomas Nilsson, C. Caesar, Björn Jonson, Marielle Chartier, F. Wamers, Hans Geissel, Rene Reifarth, V. Panin, H. Alvarez-Pol, J. Taylor, Herbert A. Simon, Thomas Aumann, L. V. Chulkov, Stefanos Paschalis, D. M. Rossi, Y. Aksyutina, Helmut Weick, Håkan T Johansson, Marina Petri, Joachim Enders, and Universidade de Santiago de Compostela. Departamento de Física de Partículas
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Nuclear and High Energy Physics ,Proton ,Nuclear Theory ,Inverse ,01 natural sciences ,0103 physical sciences ,Single-particle states ,ddc:530 ,010306 general physics ,Spectroscopy ,Nuclear Experiment ,Quasi-free scattering ,Physics ,Inverse kinematics ,010308 nuclear & particles physics ,Scattering ,lcsh:QC1-999 ,Excited state ,Atomic physics ,Spectroscopic factors ,Nucleon ,Ground state ,lcsh:Physics - Abstract
Physics letters / B 753, 204 - 210(2016). doi:10.1016/j.physletb.2015.11.082, Published by North-Holland Publ., Amsterdam
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- 2016
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20. The ISOLDE facility.
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Björn Jonson and Karsten Riisager
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- 2010
- Full Text
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21. Systematic trends in beta-delayed particle emitting nuclei: The case ofβpαemission from 21 Mg
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Joakim Cederkäll, Thomas Nilsson, V. Pesudo, K. L. Laursen, H. O. U. Fynbo, Olof Tengblad, Björn Jonson, María José García Borge, M. V. Lund, Jesper Hasseriis Mohr Jensen, José Antonio Briz, K. Riisager, and Ángel Perea
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Physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,Time distribution ,Beta decay ,Nuclear physics ,medicine.anatomical_structure ,Particle emission ,Beta (plasma physics) ,medicine ,Physics::Accelerator Physics ,Particle ,Positron emission ,Nuclear Experiment ,Nucleus - Abstract
We have observed β+-delayed α and pα emission from the proton-rich nucleus 21Mg produced at the ISOLDE facility at CERN. The assignments were cross-checked with a time distribution analysis. This is the third identified case of βpα emission. We discuss the systematic of beta-delayed particle emission decays, show that our observed decays fit naturally into the existing pattern, and argue that the patterns are to a large extent caused by odd-even effects.
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- 2015
22. First Accurate Normalization of the β -delayed α Decay of N16 and Implications for the C12(α,γ)O16 Astrophysical Reaction Rate
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Oliver S. Kirsebom, H. De Witte, L. J. Harkness-Brennan, P. Rahkila, Jesper Hasseriis Mohr Jensen, P. Díaz Fernández, Esben Rohan Christensen, V. F. E. Pucknell, Ángel Perea, Björn Jonson, M. Munch, K. Riisager, P. Van Duppen, M.C. Gallardo, A. Negret, R. Mărginean, R. Lica, R. D. Page, María José García Borge, M. V. Lund, D.T. Doherty, O. Sorlin, T. Berry, N. Warr, Miguel Madurga, L. M. Fraile, H. Törnqvist, Paul Greenlees, J. A. Swartz, Andrei Andreyev, H. O. U. Fynbo, Olof Tengblad, N. Hubbard, I. Marroquin, C. Sotty, Håkan T Johansson, V. Vedia, Marc Huyse, D. S. Judson, H.B. Sørensen, C. Mihai, I.H. Lazarus, N. Marginean, and Joonas Konki
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Physics ,Nuclear reaction ,Nuclear physics ,Reaction rate ,Normalization (statistics) ,Light nucleus ,010308 nuclear & particles physics ,Branching fraction ,0103 physical sciences ,General Physics and Astronomy ,Alpha decay ,010306 general physics ,01 natural sciences - Abstract
The C-12(alpha,gamma)O-16 reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced a width, gamma(11), of the bound 1(-) level in O-16 is particularly important to determine the cross section. The magnitude of gamma(11) is determined via sub-Coulomb a-transfer reactions or the beta-delayed a decay of N-16, but the latter approach is presently hampered by the lack of sufficiently precise data on the beta-decay branching ratios. Here we report improved branching ratios for the bound 1(-) level [b(beta,11) = (5.02 +/- 0.10) x 10(-2)] and for beta-delayed alpha emission [b(beta alpha) = (1.59 +/- 0.06) x 10(-5)]. Our value for b(beta alpha) is 33% larger than previously held, leading to a substantial increase in gamma(11). Our revised value for gamma(11) is in good agreement with the value obtained in a-transfer studies and the weighted average of the two gives a robust and precise determination of gamma(11), which provides significantly improved constraints on the C-12(alpha,gamma) cross section in the energy range relevant to hydrostatic He burning.
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- 2018
23. Structure of Be13 studied in proton knockout from B14
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Roy Crawford Lemmon, C. Wimmer, U. Datta Pramanik, K. Goebel, I. Syndikus, Nasser Kalantar-Nayestanaki, C. Wheldon, Enrique Nácher, Thomas Aumann, J. S. Winfield, Andreas Martin Heinz, N. Kurz, L. M. Fraile, Hans Geissel, Rene Reifarth, Mikhail V. Zhukov, J. Marganiec, E. Cravo, P. Velho, M. Heine, M. Caamaño, M. Roeder, O. Ershova, Alfredo Estrade, Martin Freer, Daniel Bemmerer, G. L. Wilson, P. J. Woods, S. Pietri, Z. Elekes, G. Ribeiro, Björn Jonson, J. M. Boillos, Joakim Cederkäll, J. Taylor, J. Hagdahl, Herbert A. Simon, Paloma Diaz Fernandez, T. Kroell, Andreas Wagner, Matthias Heil, R. Crespo, A. Ignatov, M. J. G. Borge, K. Riisager, Roman Gernhaeuser, K. Boretzky, A. Movsesyan, Andreas Zilges, Carlos A. Bertulani, A. Hufnagel, H. O. U. Fynbo, A. Kelic-Heil, V. Panin, T. Le Bleis, Christoph Langer, D. Cortina-Gil, L. Atar, E. Casarejos, R. Thies, Jorge Machado, Joachim Enders, Olof Tengblad, Marina Petri, Ralf Plag, J. Benlliure, Deniz Savran, D. M. Rossi, Marielle Chartier, C. Caesar, Y. Aksyutina, Simon Lindberg, Catherine Rigollet, L. V. Chulkov, Daniel Galaviz, M. Holl, O. Sorlin, C. Nociforo, Helmut Weick, Håkan T Johansson, H. Scheit, W. N. Catford, Ángel Perea, Vladimir Avdeichikov, I. Dillmann, Pavel Golubev, F. Farinon, Stefanos Paschalis, H. Alvarez-Pol, R. Kanungo, Marine Vandebrouck, Kai Zuber, M. Labiche, A. Henriques, S. Beceiro-Novo, Thomas Nilsson, F. Wamers, and Tanja Heftrich
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Physics ,Nuclear reaction ,Proton ,010308 nuclear & particles physics ,Nuclear Theory ,Gamma ray ,Halo nucleus ,01 natural sciences ,Resonance (particle physics) ,Nuclear physics ,Excited state ,0103 physical sciences ,Neutron ,Nuclear Experiment ,010306 general physics ,Nucleon - Abstract
The neutron-unbound isotope Be-13 has been studied in several experiments using different reactions, different projectile energies, and different experimental setups. There is, however, no real consensus in the interpretation of the data, in particular concerning the structure of the low-lying excited states. Gathering new experimental information, which may reveal the Be-13 structure, is a challenge, particularly in light of its bridging role between Be-12, where the N = 8 neutron shell breaks down, and the Borromean halo nucleus Be-14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be-12 after proton knockout from B-14, by measuring coincidences between Be-12, neutrons, and gamma rays originating from de-excitation of states fed by neutron decay of Be-13. The Be-13 isotopes were produced in proton knockout from a 400 MeV/nucleon B-14 beam impinging on a CH2 target. The Be-12-n relative-energy spectrum d sigma/dE(fn) was obtained from coincidences between Be-12(g.s.) and a neutron, and also as threefold coincidences by adding gamma rays, from the de-excitation of excited states in Be-12. Neutron decay from the first 5/2(+) state in Be-13 to the 2(+) state in Be-12 at 2.11 MeV is confirmed. An energy independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/nucleon B-14 beam. A low-lying p-wave resonance in Be-13(1/2(-)) is confirmed by comparing proton- and neutron-knockout data from B-14 and Be-14.
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- 2018
24. The Efficiency Index (EFFi), based on volumetric capnography, may allow for simple diagnosis and grading of COPD
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Ellen Tufvesson, Björn Jonson, Linnea Jarenbäck, Jaro Ankerst, and Leif Bjermer
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Male ,Spirometry ,medicine.medical_specialty ,Effi ,Vital Capacity ,International Journal of Chronic Obstructive Pulmonary Disease ,chronic obstructive pulmonary disease ,Pulmonary Disease, Chronic Obstructive ,03 medical and health sciences ,0302 clinical medicine ,Capnography ,Forced Expiratory Volume ,Internal medicine ,medicine ,Humans ,Lung volumes ,030212 general & internal medicine ,Aged ,Original Research ,COPD ,Lung ,volumetric capnography ,medicine.diagnostic_test ,business.industry ,carbon dioxide ,General Medicine ,Middle Aged ,medicine.disease ,Obstructive lung disease ,Confidence interval ,respiratory tract diseases ,medicine.anatomical_structure ,Breath Tests ,030228 respiratory system ,Cardiology ,Female ,single breath ,business - Abstract
Linnea Jarenbäck,1 Ellen Tufvesson,1 Jaro Ankerst,1 Leif Bjermer,1 Björn Jonson2 1Respiratory Medicine and Allergology, Department of Clinical Sciences, Skåne University Hospital, Lund University, Lund, Sweden; 2Clinical Physiology, Department of Clinical Sciences, Skåne University Hospital, Lund University, Lund, Sweden Background: Spirometry, the main tool for diagnosis and follow-up of COPD, incompletely describes the disease. Based on volumetric capnography (VCap), an index was developed for the diagnosis and grading of COPD, aimed as a complement or alternative to spirometry.Methods: Nine non-smokers, 10 smokers/former smokers without COPD and 54 smokers/former smokers with COPD were included in the study. Multiple breath washout of N2 and VCap were studied with Exhalyzer D during tidal breathing. VCap was based on signals for flow rate and CO2 and was recorded during one breath preceding N2 washout. Efficiency Index (EFFi) is the quotient between exhaled CO2 volume and the hypothetical CO2 volume exhaled from a completely homogeneous lung over a volume interval equal to 15% of predicted total lung capacity.Results: EFFi increased with increased Global initiative for chronic Obstructive Lung Disease (GOLD) stage and the majority of subjects in GOLD 2 and all subjects in GOLD 3 and 4 could be diagnosed as having COPD using the lower 95% confidence interval of the healthy group. EFFi also correlated with N2 washout (r=–0.73; p
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- 2018
25. Strong neutron pairing in core+4n nuclei
- Author
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S. Beceiro-Novo, R. Thies, Jorge Machado, Andreas Martin Heinz, Tanja Heftrich, L. M. Fraile, A. Estrade, Marina Petri, T. Le Bleis, D. Cortina-Gil, L. Atar, T. Kröll, A. Knyazev, M. A. Najafi, G. L. Wilson, D. Rossi, Kai Zuber, A. Movsesyan, Z. Elekes, Simon Lindberg, I. Syndikus, P. Díaz Fernández, K. Göbel, Catherine Rigollet, Ángel Perea, R. Crespo, F. Farinon, J. Kahlbow, V. Volkov, M. Caamaño, W. N. Catford, A. Ignatov, S. Pietri, Carlos A. Bertulani, V. Panin, C. Langer, A. Kelic-Heil, O. Sorlin, Stefanos Paschalis, J. M. Boillos, Enrique Casarejos, J. Hagdahl, Iris Dillmann, M Vandebrouck, O. Ershova, K. Boretzky, A. Henriques, Roy Crawford Lemmon, J. S. Winfield, J. Benlliure, M. Labiche, Vladimir Avdeichikov, Enrique Nácher, H. Weick, Thomas Nilsson, F. Wamers, Rituparna Kanungo, M. Holl, C. Caesar, P. Velho, Håkan T Johansson, G. Ribeiro, Pavel Golubev, F. M. Marqués, M. Heine, Andreas Zilges, Hans Geissel, J. Enders, D. Galaviz, Daniel Bemmerer, Deniz Savran, Marielle Chartier, María José García Borge, Haik Simon, M. Freer, J. Taylor, Nasser Kalantar-Nayestanaki, Olof Tengblad, C. Wheldon, C. Nociforo, A. Revel, H. Alvarez-Pol, Joakim Cederkäll, Thomas Aumann, Rene Reifarth, L. Chulkov, J. Marganiec, Mikhail V. Zhukov, D. Yakorev, Björn Jonson, M. Röder, Philip Woods, R. Plag, U. Datta Pramanik, Andreas Wagner, R. Gernhäuser, E. Cravo, Y. Togano, H. Scheit, N. Kurz, M. Heil, 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 corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole 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 ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), R3B, Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), National Science Foundation (US), Department of Energy (US), 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 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-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)
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Physics ,Valence (chemistry) ,010308 nuclear & particles physics ,Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Theory ,Aucun ,General Physics and Astronomy ,FOS: Physical sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,7. Clean energy ,Molecular physics ,Pairing ,0103 physical sciences ,Neutron ,Física nuclear ,Nuclear Experiment (nucl-ex) ,[ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex] ,010306 general physics ,Nucleon ,Nuclear Experiment ,R3B radioactive beams nuclear structure neutron-rich Coulomb dissociation - Abstract
6 pags., 4 figs., The emission of neutron pairs from the neutron-rich N = 12 isotones C-18 and O-20 has been studied by high-energy nucleon knockout from N-19 and O-21 secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay N-19(-1p)18C*-> C-16 + n + n is clearly dominated by direct pair emission. The two- neutron correlation strength, the largest ever observed, suggests the predominance of a C-14 core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay O-21(-1n)O-20*-> O-18 + n + n, attributed to its formation through the knockout of a deeply bound neutron that breaks the O-16 core and reduces the number of pairs., This work was supported by the German Federal Ministry for Education and Research (BMBF Project No. 05P15RDFN1), and through the GSI-TU Darmstadt cooperation agreement. C. A. Bertulani acknowledges support by U.S. Department of Energy Grant No. DE-FG02-08ER41533 and U.S. National Science Foundation Grant No. 1415656.
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- 2018
26. Volumetric Capnography for Noninvasive Monitoring of Acute Respiratory Distress Syndrome
- Author
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Björn Jonson
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Pulmonary and Respiratory Medicine ,ARDS ,medicine.medical_specialty ,Respiratory Distress Syndrome ,business.industry ,Dead space ,Reproducibility of Results ,030208 emergency & critical care medicine ,Acute respiratory distress ,Respiratory Dead Space ,Critical Care and Intensive Care Medicine ,medicine.disease ,Respiration, Artificial ,Severity of Illness Index ,03 medical and health sciences ,0302 clinical medicine ,030202 anesthesiology ,Capnography ,Emergency medicine ,medicine ,Volumetric capnography ,Humans ,business ,Co2 exchange ,Monitoring, Physiologic - Published
- 2018
27. Comparison of electromagnetic and nuclear dissociation of Ne-17
- Author
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H. O. U. Fynbo, Deniz Savran, F. Aksouh, Christoph Langer, D. Cortina-Gil, J. Hoffman, Mattias Lantz, Michael Heil, O. Kiselev, W. Ott, Achim Richter, Thomas Aumann, K. Riisager, R. Kulessa, Björn Jonson, C. Lehr, L. M. Fraile, Dieter H. H. Hoffmann, Ángel Perea, J. Marganiec, Carlos A. Bertulani, C. Nociforo, Marielle Chartier, C. Karagiannis, Thomas Nilsson, Stefan Typel, V. Panin, F. Wamers, Y. Aksyutina, Hans Geissel, K. Sümmerer, Ralf Plag, H. Emling, Stefanos Paschalis, S. Beceiro-Novo, N. Kurz, O. Ershova, K. Mahata, Roy Crawford Lemmon, C. Wimmer, J. V. Kratz, D. Galaviz, A. Chatillon, Herbert A. Simon, T. Le Bleis, Olof Tengblad, Helmut Weick, Håkan T Johansson, H. Alvarez-Pol, C. Muntz, Michael Wiescher, Yu. A. Litvinov, D. M. Rossi, C. Rodriguez-Tajes, Joachim Stroth, M. J. G. Borge, G. Schrieder, K. Boretzky, Rene Reifarth, L. Chulkov, Department of Energy (US), National Science Foundation (US), German Research Foundation, Federal Ministry of Education and Research (Germany), European Money Markets Institute, Helmholtz International Center for FAIR, Technische Universität Darmstadt, and Ministerio de Economía y Competitividad (España)
- Subjects
Physics ,COLLISIONS ,Internal energy ,010308 nuclear & particles physics ,01 natural sciences ,7. Clean energy ,STATE ,Dissociation (chemistry) ,Coincidence ,CAPTURE ,Reaction rate ,medicine.anatomical_structure ,Fragmentation (mass spectrometry) ,0103 physical sciences ,medicine ,Halo ,Atomic physics ,010306 general physics ,Ground state ,DECAY ,Nucleus - Abstract
8 pags., 10 figs., 3 tabs., The Borromean drip-line nucleus Ne-17 has been suggested to possess a two-proton halo structure in its ground state. In the astrophysical rp-process, where the two-proton capture reaction O-15(2p,gamma) Ne-17 plays an important role, the calculated reaction rate differs by several orders of magnitude between different theoretical approaches. To add to the understanding of the Ne-17 structure we have studied nuclear and electromagnetic dissociation. A 500 MeV/u Ne-17 beam was directed toward lead, carbon, and polyethylene targets. Oxygen isotopes in the final state were measured in coincidence with one or two protons. Different reaction branches in the dissociation of Ne-17 were disentangled. The relative populations of s and d states in F-16 were determined for light and heavy targets. The differential cross section for electromagnetic dissociation (EMD) shows a continuous internal energy spectrum in the three-body system O-15 + 2p. The Ne-17 EMD data were compared to current theoretical models. None of them, however, yields satisfactory agreement with the experimental data presented here. These new data may facilitate future development of adequate models for description of the fragmentation process., This project is supported by NAVI, GSI-TU Darmstadt cooperation, HIC for FAIR, EMMI, and BMBF and from DFG through Grant No. SFB1245 and from BMBF via Project No. 05P15RDFN1, and from the Spanish Ministry by research grant FPA2015-64969-P. C.A.B. acknowledges support by the US DOE Grant No. DE-FG02-08ER41533 and the US NSF Grant No. 1415656.
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- 2018
28. Quasifree ( p,pN ) scattering of light neutron-rich nuclei near N=14
- Author
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Roy Crawford Lemmon, M. Röder, Rituparna Kanungo, P. Cabanelas, M. Heil, S. Pietri, Hans Geissel, E. Y. Nikolskii, A. Movsesyan, J. Marganiec, O. Ershova, J. Enders, N. Kurz, V. Volkov, K. Boretzky, Iris Dillmann, Stefanos Paschalis, H. Scheit, F. Farinon, A. Estrade, Vladimir Avdeichikov, R. Plag, G. L. Wilson, A. Najafi, L. M. Fraile, V. Panin, A. M. Moro, D. Jurčiukonis, Simon Lindberg, Catherine Rigollet, Kai Zuber, U. Datta Pramanik, A. Henriques, J. Benlliure, F. Wamers, D. Yakorev, Carlos A. Bertulani, María José García Borge, J. S. Winfield, C. Langer, Andreas Zilges, I. Syndikus, A. Kelic-Heil, A. Deltuva, Thomas Nilsson, T. Le Bleis, M. Heine, G. Ribeiro, E. Cravo, D. Cortina-Gil, L. Atar, Nasser Kalantar-Nayestanaki, Mikhail V. Zhukov, Daniel Bemmerer, C. Wheldon, Marine Vandebrouck, D. Galaviz, Thomas Aumann, Y. Togano, Andreas Martin Heinz, O. Sorlin, Björn Jonson, M. Holl, T. Kröll, Andreas Wagner, Joakim Cederkäll, S. Beceiro-Novo, Ángel Perea, Enrique Nácher, Z. Elekes, H. Weick, B. Fernández-Domínguez, Philip Woods, Håkan T Johansson, K. Göbel, R. Gernhäuser, B. Pietras, Deniz Savran, Pavel Golubev, Haik Simon, M. Freer, Olof Tengblad, Rene Reifarth, Tanja Heftrich, C. Nociforo, W. N. Catford, D. Rossi, H. Alvarez-Pol, A. Ignatov, L. Chulkov, C. Caesar, J. Taylor, P. Velho, R. Crespo, A. Knyazev, R. Thies, Jorge Machado, Marina Petri, J. M. Boillos, J. Hagdahl, A. Hufnagel, M. Labiche, P. Díaz Fernández, Marielle Chartier, M. Caamaño, and Enrique Casarejos
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Physics ,Proton ,Inverse kinematics ,010308 nuclear & particles physics ,Scattering ,Nuclear Theory ,Inverse ,01 natural sciences ,Light scattering ,Nuclear physics ,Momentum ,0103 physical sciences ,Neutron ,Nuclear Experiment ,010306 general physics ,Beam (structure) - Abstract
Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The (RB)-B-3 collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable C-12 beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p, pn) and (p, 2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N = 14 to N = 15. Method: The structure of the projectiles O-23, O-22, and N-21 has been studied simultaneously via (p, pn) and (p, 2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the (RB)-B-3-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p, pn) and (p, 2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p, pn) channels, indications of a change in the structure of these nuclei moving from N = 14 to N = 15 have been observed, i.e., from the 0d(5/2) shell to the 1s(1/2). This supports previous observations of a subshell closure at N = 14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes.
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- 2018
29. Quasifree ( p , 2p ) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength
- Author
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Rene Reifarth, J. Kahlbow, E. Y. Nikolskii, R. Thies, Jorge Machado, M. Heine, A. Estrade, Marina Petri, G. Ribeiro, J. Taylor, Daniel Bemmerer, M. A. Najafi, Haik Simon, M. Freer, Olof Tengblad, Enrique Casarejos, H. Alvarez-Pol, Kai Zuber, F. Farinon, C. Nociforo, D. Rossi, Nasser Kalantar-Nayestanaki, C. Wheldon, Thomas Aumann, K. Boretzky, L. Chulkov, Andreas Martin Heinz, C. Caesar, Vladimir Avdeichikov, Tanja Heftrich, J. M. Boillos, J. Hagdahl, V. Panin, D. Galaviz Redondo, Ángel Perea, T. Kröll, Joakim Cederkäll, A. Ignatov, Carlos A. Bertulani, N. Kurz, A. Hufnagel, M. Labiche, S. Pietri, V. Volkov, P. Díaz Fernández, Mikhail V. Zhukov, G. L. Wilson, Simon Lindberg, Carlo Barbieri, I. Syndikus, J. Benlliure, F. Wamers, M. Heil, Marine Vandebrouck, Catherine Rigollet, M. Caamaño, Enrique Nácher, H. Weick, S. Beceiro-Novo, C. Langer, O. Ershova, A. Kelic-Heil, P. Velho, A. Henriques, J. S. Winfield, Thomas Nilsson, A. Knyazev, E. Cravo, Håkan T Johansson, R. Crespo, María José García Borge, Pavel Golubev, O. Sorlin, H. Scheit, Marielle Chartier, M. Holl, Deniz Savran, I. Dillmann, Stefanos Paschalis, D. Yakorev, Y. Togano, J. Marganiec-Gałązka, T. Le Bleis, D. Cortina-Gil, Rituparna Kanungo, Hans Geissel, L. Atar, A. Movsesyan, L. M. Fraile, Björn Jonson, Philip Woods, Andreas Wagner, R. Gernhäuser, Andreas Zilges, J. Enders, R. Lemmon, M. Röder, Z. Elekes, K. Göbel, R. Plag, and W. N. Catford
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Physics ,Range (particle radiation) ,010308 nuclear & particles physics ,Eikonal equation ,media_common.quotation_subject ,Nuclear Theory ,Ab initio ,General Physics and Astronomy ,chemistry.chemical_element ,7. Clean energy ,01 natural sciences ,Asymmetry ,Oxygen ,Isotopes of oxygen ,Nuclear physics ,chemistry ,Isospin ,0103 physical sciences ,Particle ,Nuclear Experiment ,010306 general physics ,media_common - Abstract
Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type OA(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.
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- 2018
30. A guide for a brave future for lung ventilation/perfusion tomography: the most important pulmonary nuclear medicine technique
- Author
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Marika Bajc, Roberto C. Delgado Bolton, and Björn Jonson
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business.industry ,MEDLINE ,General Medicine ,Respiratory physiology ,Ventilation/perfusion ratio ,Practice Guidelines as Topic ,Ventilation-Perfusion Ratio ,Humans ,Medicine ,Radiology, Nuclear Medicine and imaging ,Tomography ,Nuclear Medicine ,Nuclear medicine ,business ,Lung ,Perfusion ,Lung ventilation ,Societies, Medical - Published
- 2019
31. Effective proton-neutron interaction near the drip line from unbound states in F25,26
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R. Crespo, Hans Geissel, Ralf Plag, J. Benlliure, Jason D. Holt, H. Hergert, Marine Vandebrouck, Christoph Langer, J. M. Boillos, Z. Elekes, J. Hagdahl, T. Kröll, J. Taylor, J. S. Winfield, A. Kelic-Heil, C. Caesar, Björn Jonson, Rene Reifarth, Roman Gernhäuser, A. Ignatov, D. M. Rossi, D. Galaviz, Joachim Enders, L. Chulkov, Deniz Savran, Ángel Perea, A. Lepailleur, F. Farinon, M. Heine, M. A. Najafi, Mikhail V. Zhukov, Nasser Kalantar-Nayestanaki, Andreas Wagner, T. Le Bleis, J. Kahlbow, Daniel Bemmerer, R. Kanungo, P. Velho, E. Y. Nikolskii, O. Sorlin, C. Wheldon, Thomas Aumann, M. Caamaño, D. Cortina-Gil, Stefanos Paschalis, Andreas Martin Heinz, L. Atar, Iris Dillmann, C. Nociforo, A. Henriques, R. Thies, Jorge Machado, O. Ershova, V. Panin, Marina Petri, Joakim Cederkäll, M. Holl, E. Cravo, Thomas Nilsson, A. Estrade, V. Volkov, W. N. Catford, Olof Tengblad, Vladimir Avdeichikov, Martin Freer, Marielle Chartier, F. Wamers, Simon Lindberg, M. J. G. Borge, Kai Zuber, Kathrin Göbel, Enrique Nácher, M. Röder, U. Datta Pramanik, Catherine Rigollet, H. Alvarez-Pol, Julien Gibelin, K. Boretzky, Yasuhiro Togano, M. Heil, I. Syndikus, L. M. Fraile, P. Díaz Fernández, A. Knyazev, S. R. Stroberg, S. Beceiro-Novo, Achim Schwenk, Tanja Heftrich, A. Movsesyan, D. Yakorev, A. Hufnagel, J. Marganiec, Helmut Weick, Håkan T Johansson, H. Scheit, Pavel Golubev, F. M. Marqués, Andreas Zilges, M. Labiche, G. L. Wilson, F. de Oliveira Santos, Carlos A. Bertulani, G. Ribeiro, P. J. Woods, S. Pietri, Enrique Casarejos, N. Kurz, Scott Bogner, Herbert A. Simon, and Roy Crawford Lemmon
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Physics ,010308 nuclear & particles physics ,Binding energy ,Ab initio ,Resonance ,7. Clean energy ,01 natural sciences ,Atomic mass ,0103 physical sciences ,Bound state ,Nuclear force ,Neutron ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Multiplet - Abstract
Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J(pi) = 1(1)(+) - 4(1)(+) multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J(pi) = 1(1)(+), 2(1)(+), 4(1)(+) bound states have been determined, and only a clear identification of the J(pi) = 3(1)(+) is missing. Purpose: We wish to complete the study of the J(pi) = 1(1)(+) - 4(1)(+) multiplet in F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. rays and neutrons, added to the reconstruction of the momentum vector of the A - 1 nuclei, allowed the determination of the energy of three unbound states in F-25 and two in F-26. Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, the first resonance at 323(33) keV is proposed to be the J(pi) = 3(1)(+) member of the J(pi) = 1(1)(+) - 4(1)(+) multiplet. Energies of observed states in F-25,F-26 have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method. Conclusions: The deduced effective proton- neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of F-26.
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- 2017
32. Late Breaking Abstract - Capnography for ultimately simple diagnostics of COPD
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Ellen Tufvesson, Björn Jonson, Leif Bjermer, and Linnea Jarenbäck
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Spirometry ,medicine.medical_specialty ,Capnography ,COPD ,medicine.diagnostic_test ,business.industry ,respiratory system ,medicine.disease ,respiratory tract diseases ,FEV1/FVC ratio ,Impulse Oscillometry ,DLCO ,Internal medicine ,medicine ,Cardiology ,Breathing ,Plethysmograph ,business - Abstract
Background: Chronic obstructive pulmonary disease (COPD) begins with inhomogeneous peripheral lung pathology for which the cheapest and simplest method of recognition is volumetric capnography. Aim: To evaluate the capnographic Lung Inhomogeneity index (LINHI) for diagnostics of COPD. Method: Volumetric capnography for a single breath at rest was analysed over a volume segment starting at appearance of CO2 and covering a volume of 15 % of predicted TLC. LINHI was defind as the grey area above the curve of the healthy subject divided by the area of the rectangle, i.e. 5x15 (Fig. 1A). Material: 12 non-smokers and 54 subjects with COPD GOLD 1-4 performed volumetric capnography, body plethysmography/spirometry, impulse oscillometry, DLCO test and N2 washout (ventilation heterogenity in the acinar airways). Results: LINHI continuously increased from healthy subjects to COPD of increasing severity. (Figure 1B). It correlated to N2 washout (0.72***), FEV1%predicted (-0.74***), DLCO%predicted (-0.75***) and FEV1/FVC (-0.55***). Conclusion: LINHI reflects inefectiveness of CO2 elimination caused by inhomogeniety of lung function and could identify COPD patients with increasing stages. LINHI offers an easy, effortless and cost valuable complement and in some situations, as it is easy to perform, even a good alternative to spirometry.
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- 2017
33. Ground-state configuration of neutron-rich Al-35 via Coulomb breakup
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Reiner Kruecken, Heiko Scheit, T. Le Bleis, V. Panin, M. V. Ricciardi, Andreas Wagner, Helmut Weick, D. Cortina-Gil, Håkan T Johansson, Nasser Kalantar-Nayestanaki, J. Taylor, Thomas Nilsson, Yasuhiro Togano, W. N. Catford, Hans Geissel, Thomas Aumann, C. Scheidenberger, T. Kroell, F. Wamers, P. Díaz Fernández, D. M. Rossi, O. Ershova, G. Münzenberg, S. Chakraborty, Björn Jonson, M. A. Najafi, Ralf Plag, L. M. Fraile, Marielle Chartier, Stefan Typel, S. Beceiro-Novo, J. Marganiec, C. Nociforo, Rene Reifarth, Ushasi Datta, K. Boretzky, Yutaka Utsuno, G. de Angelis, Yvonne Leifels, B. V. Carlson, C. Langer, Anisur Rahaman, Herbert A. Simon, H. Emling, Catherine Rigollet, D. González-Díaz, C. Caesar, J. S. Winfield, and Research unit Nuclear & Hadron Physics
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Physics ,ISLAND ,IONS ,COLLISIONS ,Valence (chemistry) ,NUCLEI ,Ion ,N=20 SHELL CLOSURE ,Atomic orbital ,Excited state ,EXCITATION ,Coulomb ,ISOTOPES ,Neutron ,INVERSION ,Atomic physics ,Nucleon ,Ground state ,EMISSION ,MASS MEASUREMENTS - Abstract
The ground-state configuration of Al-35 has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of similar to 403 MeV/nucleon. The measured inclusive differential CD cross section for Al-35, integrated up to 5.0 MeV relative energy between the Al-34 core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34Al is 29(7) mb. The differential CD cross section of Al-35 -> Al-34 + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of Al-35 could be, tentatively, 1/2+ or 3/2(+) or 5/2(+). The valence neutrons, in the ground state of Al-35, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the Al-34 core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2+ is the ground-state spin-parity of Al-35 as suggested in the literature, then the major ground-state configuration of Al-35 is a combination of Al-34(g. s.; 4(-)) circle times upsilon(p3/2) and Al-34(isomer; 1(+)) circle times upsilon(d3/2) states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.
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- 2017
34. ISOLDE past, present and future
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María José García Borge, Björn Jonson, and SCOAP
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Physics ,Nuclear and High Energy Physics ,Booster (rocketry) ,Large Hadron Collider ,010308 nuclear & particles physics ,business.industry ,01 natural sciences ,Nuclear physics ,Radioactive decay and in-beam spectroscopy ,Radioactive beams, properties of nuclei ,0103 physical sciences ,Nuclear structure ,010306 general physics ,Telecommunications ,business ,Radioactive beam - Abstract
21 pags., 11 figs. -- Open Access funded by Creative Commons Atribution Licence 3.0. -- A corrigendum for this article has been published in 2017 J. Phys. G: Nucl. Part. Phys. 44 079501, The idea of production of short-lived radioisotopes with the on-line technique has it roots in the early 1950s. In 1964 this became a reality when CERN approved an experiment at the 600 MeV proton synchro-cyclotron, the SC. The first experiments were performed in 1967 and since then the ISOLDE programme has gradually developed into a major undertaking. Since 1992 the ISOLDE Radioactive Beam Facility is linked to an external proton beam from the PS Booster. Today this 50 years old `lady¿ is more vital than ever. With the successful start of HIE-ISOLDE in 2015 one may conclude that the facility is ready to face the next half century with the boost of the success and the necessary knowledge to face new challenges. In this introductory article we give an overview of the history and pick up a few examples along the nuclear chart as illustrations of the experimental achievements., This contribution to the ISOLDE focus issue is dedicated to all those who have made ISOLDE a wonderful and challenging working place and Research Facility.
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- 2017
35. Study of bound states in 10Be by one neutron removal reactions of 11Be
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K. Nowak, Roman Gernhäuser, Thomas Nilsson, D. Voulot, Jan Diriken, Liam Gaffney, V. Bildstein, Th. Kröll, K. Riisager, R. Krücken, Kathrin Wimmer, Riccardo Raabe, J. Elseviers, Björn Jonson, H. O. U. Fynbo, Olof Tengblad, M. Cubero, María José García Borge, M. Seidlitz, H. Törnqvist, Joonas Konki, V. Pesudo, D. Mücher, N. Warr, L. M. Fraile, H. De Witte, G. T. Koldste, J. G. Johansen, Janne Pakarinen, Research Foundation - Flanders, European Commission, Science and Technology Facilities Council (UK), Maier-Leibnitz-Laboratorium, Ministerio de Economía y Competitividad (España), Federal Ministry of Education and Research (Germany), Belgian Science Policy Office, and SCOAP
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Nuclear and High Energy Physics ,Proton ,Population ,01 natural sciences ,Gamma spectroscopy ,Transfer reactions ,0103 physical sciences ,Bound state ,Neutron ,Nuclear Experiment ,010306 general physics ,education ,Physics ,education.field_of_study ,10Be ,010308 nuclear & particles physics ,Be ,Charged particle ,3. Good health ,Deuterium ,Excited state ,differential cross section ,gamma spectroscopy ,transfer reactions ,Physics::Accelerator Physics ,Atomic physics ,Differential cross section ,Ground state - Abstract
13 pags., 6 figs. 3 tabs.-- Open Access funded by Creative Commons Atribution Licence 3.0, The bound states of Be have been studied by removing single neutrons from Be nuclei. A 2.8 MeV u beam of Be was produced at ISOLDE, CERN and directed on to both proton and deuteron targets inducing one-neutron removal reactions. Charged particles were detected to identify the two reaction channels (d, t) and (p, d), and the individual states in Be were identified by gamma detection. All bound states but one were populated and identified in the (d, t) reaction. The combination of REX-ISOLDE and MINIBALL allowed for a clean separation of the high-lying states in Be. This is the first time these states have been separated in a reaction experiment. Differential cross sections have been calculated for all the reaction channels and compared to DWBA calculations. Spectroscopic factors are derived and compared to values from the litterature. While the overall agreement between the spectrocopic factors is poor, the ratio between the ground state and the first excited state is in agreement with the previous measured ones. Furthermore, a significant population of the state is observed, which which may indicate the presence of multi-step processes at our beam energy., This work was supported by the Danish Research Council, by the European Union Seventh Framework through ENSAR (Contract No. 262010) and a Marie Curie Actions Grant under Contract No. PIEF-GA-2008-219175, by the BMBF under Contracts No. 06MT7178, No. 06MT9156, No. 05P09PKCI5, No. 05P12PKFNE, No. 06DA9036I, No. 05P12RDCIA, No. 05P15PKCIA and Verbundprojekt 05P2015, by the Spanish MINNECO under Contracts No. FPA2012-34332 and No. FPA2015-, by the FWO-Vlaanderen (Belgium), by GOA/10/010 (BOF KU Leuven), by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), by the United Kingdom Science and Technology Facilities Council, and by Maier-Leibnitz-Laboratorium, Garching.
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- 2017
36. Coulomb breakup of neutron-rich 29,30Na isotopes near the island of inversion
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Håkan Johansson, Herbert A. Simon, T. Kröll, J. Marganiec, Helmut Weick, Anisur Rahaman, O. Ershova, C. Caesar, Stefan Typel, Thomas Nilsson, Ushasi Datta, G. Münzenberg, D. Yakorev, Yasuhiro Togano, F. Wamers, J. Taylor, J. S. Winfield, Y. Leifels, Nasser Kalantar-Nayestanaki, A. Najafi, C. Scheidenberger, L. M. Fraile, K. Boretzky, Thomas Aumann, T. Le Bleis, Björn Jonson, R. Krücken, D. Cortina-Gil, V. Ricciardi, S. Beceiro-Novo, C. Nociforo, Christoph Langer, V. Volkov, G. de Angelis, J. Kurcewicz, H. Emling, B. V. Carlson, W. N. Catford, Catherine Rigollet, P. Díaz Fernández, D. M. Rossi, Andreas Wagner, D. Gonzalez-Diaz, Mario Weigand, Marielle Chartier, Stefanos Paschalis, M. Zoric, Rene Reifarth, Heiko Scheit, Ralf Plag, Hans Geissel, S. Chakraborty, V. Panin, and Research unit Nuclear & Hadron Physics
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Nuclear and High Energy Physics ,ground state configuration ,COLLISIONS ,Nuclear Theory ,neutron-rich nulei, RIB, Coulomb breakup, ground state configuration, spectroscopic factor, island of inversion ,FOS: Physical sciences ,Coulomb excitation ,01 natural sciences ,Nuclear Theory (nucl-th) ,Atomic orbital ,0103 physical sciences ,Coulomb ,Coulomb breakup ,Neutron ,Nuclear Experiment (nucl-ex) ,spectroscopic factor ,010306 general physics ,Nuclear Experiment ,Physics ,Valence (chemistry) ,neutron-rich nulei ,NUCLEI ,010308 nuclear & particles physics ,Island of inversion ,RIB ,island of inversion ,Coulomb-dissociation 29Na 30Na breakup spin parity ,SHELL-MODEL ,Atomic physics ,Nucleon ,Ground state - Abstract
First results are reported on the ground state configurations of the neutron-rich $^{29,30}$Na isotopes, obtained via Coulomb dissociation (CD) measurements as a method of the direct probe. The invariant mass spectra of those nuclei have been obtained through measurement of the four-momentum of all decay products after Coulomb excitation on a $^{208}Pb$ target at energies of 400-430 MeV/nucleon using FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated Coulomb-dissociation cross-sections (CD) of 89 $(7)$ mb and 167 $(13)$ mb up to excitation energy of 10 MeV for one neutron removal from $^{29}$Na and $^{30}$Na respectively, have been extracted. The major part of one neutron removal, CD cross-sections of those nuclei populate core, in its' ground state. A comparison with the direct breakup model, suggests the predominant occupation of the valence neutron in the ground state of $^{29}$Na${(3/2^+)}$ and $^{30}$Na${(2^+)}$ is the $d$ orbital with small contribution in the $s$-orbital which are coupled with ground state of the core. The ground state configurations of these nuclei are as $^{28}$Na$_{gs (1^+)\otimes\nu_{s,d}$ and $^{29}$Na$_{gs}(3/2^+)\otimes\nu_{ s,d}$, respectively. The ground state spin and parity of these nuclei, obtained from this experiment are in agreement with earlier reported values. The spectroscopic factors for the valence neutron occupying the $s$ and $d$ orbitals for these nuclei in the ground state have been extracted and reported for the first time. A comparison of the experimental findings with the shell model calculation using MCSM suggests a lower limit of around 4.3 MeV of the sd-pf shell gap in $^{30}$Na., Comment: Modified version of the manuscript is accepted for publication in Journal of Physics G, Jan., 2017
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- 2017
37. Determination of the neutron-capture rate of C17 for r -process nucleosynthesis
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Håkan T Johansson, Pavel Golubev, Enrique Casarejos, T. Adachi, J. Van de Walle, Ethan Uberseder, G. L. Wilson, Y. Aksyutina, S. Beceiro-Novo, J. Enders, Ángel Perea, F. Farinon, C. Langer, R. Knöbel, J. Benlliure, O. Lepyoshkina, Marielle Chartier, A. Kelic-Heil, F. Wamers, N. I. Ashwood, A. Najafi, M. Barr, Kai Zuber, J. Alcantara, Tanja Heftrich, T. Le Bleis, A. Henriques, G. Ickert, J. S. Winfield, D. Cortina-Gil, Thomas Nilsson, G. Ribeiro, Hans Geissel, S. Pietri, Haik Simon, M. Freer, Anisur Rahaman, C. Caesar, Olof Tengblad, C. Nociforo, Stefanos Paschalis, O. Ershova, D. Rossi, Y. Togano, Stefan Typel, S. Chakraborty, A. Movsesyan, O. Sorlin, K. Boretzky, K. Riisager, P. Díaz Fernández, Andreas Zilges, A. Ignatov, Meng-Ru Wu, P. Velho, Vladimir Avdeichikov, Simon Lindberg, A. Prochazka, Catherine Rigollet, Mario Weigand, M. Caamaño, B. Streicher, J. Taylor, Z. Elekes, W. N. Catford, S. Terashima, K. Göbel, V. Panin, Bo Jakobsson, M. Heil, J. Hagdahl, Carlos A. Bertulani, M. V. Ricciardi, Björn Jonson, Philip Woods, M. Labiche, M. Freudenberger, L. M. Fraile, R. Plag, U. Datta Pramanik, S. Altstadt, Gabriel Martínez-Pinedo, R. Thies, Jorge Machado, T. Neff, Marina Petri, R. Crespo, H. Weick, M. Holl, J. Kurcewicz, Andreas Wagner, H. Scheit, H. Alvarez-Pol, R. Gernhäuser, H. O. U. Fynbo, Nasser Kalantar-Nayestanaki, G. Rastrepina, J. Sanchez del Rio, D. Galaviz, C. Wheldon, Thomas Aumann, Deniz Savran, N. Kurz, Andreas Martin Heinz, M. Röder, T. Kröll, V. Stoica, M. Mostazo, V. Volkov, M. Heine, Daniel Bemmerer, I. Dillmann, Joakim Cederkäll, D. Yakorev, Mikhail V. Zhukov, V. Maroussov, A. Estrade, J. Marganiec, Rene Reifarth, G. Burgunder, Roy Crawford Lemmon, C. Wimmer, Rituparna Kanungo, L. Chulkov, R. Krücken, D. Gonzalez Diaz, and María José García Borge
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Physics ,education.field_of_study ,010308 nuclear & particles physics ,Population ,7. Clean energy ,01 natural sciences ,Spectral line ,Nuclear physics ,Neutron capture ,Nucleosynthesis ,Excited state ,0103 physical sciences ,Coulomb ,r-process ,Atomic physics ,Nuclear Experiment ,010306 general physics ,education ,Ground state - Abstract
With the R$^{3}$B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of $^{18}$C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of $^{17}$C into the ground state of $^{18}$C. Those data have been used to constrain theoretical calculations for transitions populating excited states in $^{18}$C. This allowed to derive the astrophysical cross section $\sigma^{*}_{\mathrm{n}\gamma}$ accounting for the thermal population of $^{17}$C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures $T_{9}\leq{}1$~GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of $^{17}$C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.
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- 2017
38. Anaesthetic conserving device AnaConDa ® : dead space effect and significance for lung protective ventilation
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Björn Jonson, Gunnar Malmkvist, Mikael Bodelsson, and Louise Walther Sturesson
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Adult ,Male ,Methyl Ethers ,Dead space ,medicine.medical_treatment ,Sevoflurane ,law.invention ,Anaconda ,law ,Tidal Volume ,medicine ,Humans ,Aged ,Aged, 80 and over ,Postoperative Care ,Mechanical ventilation ,Lung ,biology ,Pulmonary Gas Exchange ,business.industry ,Equipment Design ,Respiratory Dead Space ,Lung protective ventilation ,Carbon Dioxide ,Middle Aged ,biology.organism_classification ,Respiration, Artificial ,Anesthesiology and Pain Medicine ,medicine.anatomical_structure ,Heat and moisture exchanger ,Anesthesia ,Anesthetics, Inhalation ,Ventilation (architecture) ,Female ,Anesthesia, Inhalation ,business ,medicine.drug - Abstract
The anaesthetic conserving device AnaConDa (ACD) reflects exhaled anaesthetic agents thereby facilitating the use of inhaled anaesthetic agents outside operating theatres. Expired CO₂ is, however, also reflected causing a dead space effect in excess of the ACD internal volume. CO₂ reflection from the ACD is attenuated by humidity. This study tests the hypothesis that sevoflurane further attenuates reflection of CO₂. An analysis of clinical implications of our findings was performed.Twelve postoperative patients received mechanical ventilation using a conventional heat and moisture exchanger (HME, internal volume 50 ml) and an ACD (100 ml), the latter with or without administration of sevoflurane. The ACD was also studied with a test lung at high sevoflurane concentrations. Reflection of CO₂ and dead space effects were evaluated with the single-breath test for CO2.Sevoflurane reduced but did not abolish CO₂ reflection. In patients, the mean dead space effect with 0.8% sevoflurane was 88 ml larger using the ACD compared with the HME (P0.001), of which 38 ml was due to CO₂ reflection. Our calculations show that with the use of the ACD, normocapnia cannot be achieved with tidal volume6 ml kg(-1) even when respiratory rate is increased.An ACD causes a dead space effect larger than its internal volume due to reflection of CO₂, which is attenuated but not abolished by sevoflurane administration. CO₂ reflection from the ACD limits its use with low tidal volume ventilation, such as with lung protection ventilation strategies.Clinical Trials NCT01699802.
- Published
- 2014
39. Halo Influence on RIB Physics
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K. Riisager and Björn Jonson
- Subjects
Radioactive ion beams ,Physics ,Nuclear and High Energy Physics ,Astrophysics ,Halo - Abstract
©, Copyright Taylor & Francis. We are now well past the silver jubilee for halo nuclei and it may be of some interest to look back and reflect on how the emergence of this new type of nuclear structure has influenced the progress of our science. Time-wise, the discovery of halos coincide with the rapid growth of the field of radioactive ion beams (RIB) also called radioactive nuclear beams, as seen, for example, from the conference series starting in 1989 that carried this name. Even though many of the developments within RIB physics would have happened without the impetus given by the many experiments on halo nuclei, many were indeed triggered by the halo phenomenon and the speed with which they have been implemented has certainly been increased. We shall briefly recall some historical important contributions to halo physics and attempt to show the many-faceted influence they have had. We also offer some speculations on the future progress.
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- 2014
40. Quasi-free proton knockout from 12C on carbon target at 398 MeV/u
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J. Taylor, D. M. Rossi, Christoph Langer, Helmut Weick, Håkan T Johansson, Marielle Chartier, Michael Heil, H. Scheit, M. Holl, Stefanos Paschalis, Björn Jonson, T. Le Bleis, Thomas Aumann, H. Alvarez-Pol, Carlos A. Bertulani, D. Cortina-Gil, Y. Aksyutina, C. Caesar, Thomas Nilsson, Herbert A. Simon, F. Wamers, O. Kiselev, O. Ershova, Hans Geissel, Roy Crawford Lemmon, C. Wimmer, V. Panin, L. V. Chulkov, K. Boretzky, Ralf Plag, Joachim Enders, A. Kelic-Heil, Rene Reifarth, Roman Gernhäuser, and Marina Petri
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Physics ,Nuclear and High Energy Physics ,Proton ,Scattering ,Eikonal equation ,Nuclear Theory ,chemistry.chemical_element ,lcsh:QC1-999 ,Cross section (physics) ,chemistry ,ddc:530 ,Atomic physics ,Nuclear Experiment ,Nucleon ,Carbon ,lcsh:Physics - Abstract
Physics letters / B B 797, 134802 (2019). doi:10.1016/j.physletb.2019.134802, Published by North-Holland Publ., Amsterdam
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- 2019
41. Momentum profile analysis in one-neutron knockout from Borromean nuclei
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Y. Aksyutina, C. Caesar, K. Mahata, Göran Hugo Nyman, D. M. Rossi, Thomas Nilsson, Helmut Weick, Håkan T Johansson, María José García Borge, G. Schrieder, R. Kulessa, K. Boretzky, Rene Reifarth, L. V. Chulkov, G. Münzenberg, G. Ickert, T. LeBleis, Hans Geissel, Mikhail V. Zhukov, Stefanos Paschalis, Achim Richter, Thomas Aumann, H. O. U. Fynbo, K. Sümmerer, Olof Tengblad, H. Emling, R. Palit, D. Cortina-Gil, Herbert A. Simon, K. Riisager, W. Prokopowicz, C. Langer, A. Chatillon, Björn Jonson, U. Datta Pramanik, and SCOAP
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Physics ,Angular momentum ,Nuclear and High Energy Physics ,Isotope ,Nuclear Theory ,Function analysis ,Nuclear physics ,ddc:530 ,Neutron ,Profile analysis ,Atomic physics ,Nuclear Experiment ,Ground state ,Spectroscopy ,GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries) ,Relative energy - Abstract
Open Access funded by SCOAP3 - Sponsoring Consortium for Open Access Publishing in Particle Physics, One-neutron knockout reactions from Borromean nuclei are analyzed using a profile function analysis technique. The profile function, which is derived as the square root of the variance of the measured fragment + neutron momenta as a function of their relative energy, is shown to be very sensitive to the angular momentum of the knocked out neutron. Three cases are studied here: 7He, where the profile function analysis shows a presence of (s1/2)2 component in the 8He ground-state wave-function, 10Li, where the presence of a 11(2)% d-wave contribution to the relative energy spectrum above 1.5 MeV is found and, finally, the presence of a major s contribution around 0.5 MeV relative energy in the 13Be case and that the observed decay to the 12Be 2+ state originates in a d state in 13Be. © 2012 Elsevier Open access under CC BY license., Financial support from the Swedish Research Council and the Spanish Ministry through the research grant FPA2009-07387 is also acknowledged.
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- 2013
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42. Beta-delayed proton emission from 20Mg
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C. Sotty, Miguel Madurga, A. Negret, R. Wadsworth, Björn Jonson, M. Munch, S. Pascu, R. Mărginean, M. Stanoiu, M. V. Lund, L. J. Harkness-Brennan, Andrei Andreyev, I.H. Lazarus, P. Rahkila, R. Lica, Simon Lindberg, A. Turturica, R. D. Page, N. Marginean, Joonas Konki, P. Van Duppen, H. O. U. Fynbo, Ángel Perea, Olof Tengblad, María José García Borge, Oliver S. Kirsebom, V. Vedia, Marc Huyse, A. M. Howard, K. Riisager, Joakim Cederkäll, C. Mihai, E. Rapisarda, V. F. E. Pucknell, H. De Witte, Thomas Nilsson, Enrique Nácher, N. Warr, J. Kurcewicz, Paul Greenlees, I. Marroquin, L. M. Fraile, D. S. Judson, F. Rotaru, European Commission, Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), European Organization for Nuclear Research, Ministerio de Economía y Competitividad (España), and Danish Natural Science Research Council
- Subjects
Physics ,Nuclear and High Energy Physics ,Decay scheme ,Large Hadron Collider ,Proton ,010308 nuclear & particles physics ,Hadron ,Resonance ,01 natural sciences ,Beta decay ,Nuclear physics ,0103 physical sciences ,Nuclear fusion ,Atomic physics ,Proton emission ,Nuclear Experiment ,010306 general physics - Abstract
M. V. et al. ; 14 págs.; 10 figs.; 6 tabs., Beta-delayed proton emission from Mg has been measured at ISOLDE, CERN, with the ISOLDE Decay Station (IDS) setup including both charged-particle and gamma-ray detection capabilities. A total of 27 delayed proton branches were measured including seven so far unobserved. An updated decay scheme, including three new resonances above the proton separation energy in Na and more precise resonance energies, is presented. Beta-decay feeding to two resonances above the Isobaric Analogue State (IAS) in Na is observed. This may allow studies of the 4032.9(2.4)keV resonance in Ne through the beta decay of Mg, which is important for the astrophysically relevant reaction O(α,γ)Ne. Beta-delayed protons were used to obtain a more precise value for the half-life of Mg, 91.4(1.0)ms. © SIF, Springer-Verlag Berlin Heidelberg, 2016, This work has been supported by the European Commision within the Seventh Framework Programme “European Nuclear Science and Applications Research”, contract no. 262010 (ENSAR), by the Spanish research agency under number FPA2012- 32443, FPA2015-64969-P and FPA2015-65035-P and by the Romanian IFA Grant CERN/ISOLDE. The authors also acknowledge the support of the Danish Natural Science Research Council, the United Kingdom Science and Technology Facilities Council, the German BMBF under grants 05P12PKFNE and 05P15PKCIA and the German Verbundprojekt 05P20015- ISOLDE
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- 2016
43. Coulomb dissociation of $^{20,21}$N
- Author
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A. Estrade, G. Burgunder, Andreas Martin Heinz, Andreas Wagner, Enrique Casarejos, Roy Crawford Lemmon, C. Wimmer, Ethan Uberseder, M. Heine, T. Le Bleis, N. Kurz, H. O. U. Fynbo, Olof Tengblad, D. Cortina-Gil, V. Stoica, F. Farinon, L. Atar, D. Yakorev, Joachim Enders, Helmut Weick, Z. Elekes, Carlos A. Bertulani, J. Sanchez del Rio Saez, Håkan T Johansson, Daniel Bemmerer, M. Freudenberger, D. Galaviz, Mikhail V. Zhukov, Heiko Scheit, Herbert A. Simon, A. Ignatov, P. Diaz-Fernandez, Nasser Kalantar-Nayestanaki, C. Wheldon, Thomas Aumann, P. Velho, J. Van de Walle, K. Riisager, Pavel Golubev, U. Datta Pramanik, J. Taylor, J. Marganiec, G. L. Wilson, Ralf Plag, J. Benlliure, O. Lepyoshkina, Marielle Chartier, N. I. Ashwood, A. Movsesyan, M. Röder, Andreas Zilges, Yasuhiro Togano, P. J. Woods, Ronja Thies, S. Pietri, R. Kanungo, Kai Zuber, Najafi, M. Labiche, M. J. G. Borge, Thomas Nilsson, A. Prochazka, G. Ribeiro, Christoph Langer, Ángel Perea, Roman Gernhäuser, G. Ickert, T. Adachi, R. Crespo, K. Boretzky, J. S. Winfield, W. N. Catford, G. Rastrepina, H. Alvarez-Pol, Bo Jakobsson, M. Barr, L. M. Fraile, C. Nociforo, F. Wamers, Rahaman, M. V. Ricciardi, M. Mostazo Caro, Björn Jonson, T. Kröll, Y. Aksyutina, Vladimir Avdeichikov, R. Knöbel, Matthias Heil, C. Caesar, B. Streicher, Joakim Cederkäll, J. Hagdahl, J. Kurcewicz, Deniz Savran, M. Caamaño, V. Volkov, Satoru Terashima, M. Holl, O. Ershova, Kathrin Göbel, A. Henriques, Martin Freer, J. Alcantara, Jorge Machado, Marina Petri, D. M. Rossi, Tanja Heftrich, S. Chakraborty, Mario Weigand, Simon Lindberg, R. Krücken, D. Gonzalez Diaz, Catherine Rigollet, Hans Geissel, Rene Reifarth, O. Sorlin, L. V. Chulkov, I. Dillmann, Stefanos Paschalis, V. Panin, S. Altstadt, S. Beceiro, A. Kelic-Heil, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), 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
Physics ,Light nucleus ,010308 nuclear & particles physics ,Thermonuclear reaction ,Aucun ,FOS: Physical sciences ,chemistry.chemical_element ,Detailed balance ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,7. Clean energy ,Dissociation (chemistry) ,Ion ,chemistry ,0103 physical sciences ,Coulomb ,Fluorine ,Nuclear Experiment (nucl-ex) ,Atomic physics ,010306 general physics ,Nuclear Experiment ,Excitation - Abstract
International audience; Neutron-rich light nuclei and their reactions play an important role for the creation of chemical elements. Here, data from a Coulomb dissociation experiment on $^{20,21}$N are reported. Relativistic $^{20,21}$N ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ and $^{20}\mathrm{N}(\mathrm{n},\gamma)^{21}\mathrm{N}$ excitation functions and thermonuclear reaction rates have been determined. The $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ rate is up to a factor of 5 higher at $T
- Published
- 2016
44. What’s next in nuclear physics with RIB’s
- Author
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Björn Jonson
- Subjects
Physics ,Nuclear physics ,010308 nuclear & particles physics ,Paradigm shift ,0103 physical sciences ,General Physics and Astronomy ,010306 general physics ,01 natural sciences ,Task (project management) - Abstract
The physics with energetic radioactive beams has had a tremendous development over the 30 years that have passed since Isao Tanihata's famous experiments at Berkeley. The experiments and the subsequent understanding that halo structure occur for some very exotic nuclei have attracted so much interest and given so many novel ideas that one may speak about a paradigm shift. I shall here give some, personal, ideas about "What's next". This is an interesting task and I shall not say that it is difficult but rather challenging. I shall, however, start by giving a few milestones, preceding the 1985 break-through, that were of key importance for creating our sub-field of modern nuclear physics.
- Published
- 2016
45. Multi-particle Emission from ar-31 at ISOLDE
- Author
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R. Lica, Thomas Nilsson, H. De Witte, M. J. G. Borge, G. T. Koldste, Björn Jonson, M. Munch, H. O. U. Fynbo, I. Marroquin, M. V. Lund, K. Riisager, E. Rapisarda, S. A. Nae, C. Mazzocchi, Olof Tengblad, A. Turturica, C. Sotty, Håkan Johansson, Enrique Nácher, C. Mihai, Ángel Perea, A. M. Howard, J. Refsgaard, A. Negret, A. A. Ciemny, M. Madurga, L. M. Fraile, M. V. Vedia, A. Garzon-Camacho, M. Stanoiu, Oliver S. Kirsebom, and Ministerio de Economía y Competitividad (España)
- Subjects
Physics ,Proton ,010308 nuclear & particles physics ,General Physics and Astronomy ,01 natural sciences ,Nuclear physics ,medicine.anatomical_structure ,Particle emission ,Beta (plasma physics) ,0103 physical sciences ,medicine ,Nuclear Physics - Experiment ,Atomic physics ,010306 general physics ,Nucleus - Abstract
I. Marroquín et al. ; 8 págs.; 6 fgis.; 1 tab. ; Presented at the XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland, September 6–13, 2015., A multi-particle decay experiment was successfully performed at the ISOLDE Decay Station. In this new permanent station, devoted to -decay studies, the novel MAGISOL Si-Plugin Chamber was installed to study the exotic decay modes of the proton drip-line nucleus 31Ar. The motivation was to search for 3p and 3p channels, as well as to provide information on resonances in 30S and 29P relevant for the astrophysical rp-process. Description of the experimental set-up and preliminary results are presented., This work is supported by the Spanish Funding Agency under Project No. FPA2012-32443 and FPI grant BES-2013-066348.
- Published
- 2016
46. Carbon dioxide rebreathing with the anaesthetic conserving device, AnaConDa ®
- Author
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Gunnar Malmkvist, Mikael Bodelsson, Lisbet Niklason, Björn Jonson, and Louise Walther Sturesson
- Subjects
Models, Anatomic ,dead space ,Respiratory rate ,Dead space ,Respiratory Dead Space ,Anaconda ,Gas Scavengers ,Respiratory Rate ,Tidal Volume ,Humans ,anaesthetic techniques ,Medicine ,Tidal volume ,inhalation ,Anesthesiology and Intensive Care ,biology ,Inhalation ,business.industry ,carbon dioxide ,rebreathing ,Carbon Dioxide ,biology.organism_classification ,Anesthesiology and Pain Medicine ,Volume (thermodynamics) ,airway ,Heat and moisture exchanger ,Anesthesia ,Anesthetics, Inhalation ,heatmoisture exchanger ,Anesthesia, Inhalation ,business ,equipment - Abstract
The anaesthetic conserving device (ACD) AnaConDa(®) was developed to allow the reduced use of inhaled agents by conserving exhaled agent and allowing rebreathing. Elevated has been observed in patients when using this ACD, despite tidal volume compensation for the larger apparatus dead space. The aim of the present study was to determine whether CO(2), like inhaled anaesthetics, adsorbs to the ACD during expiration and returns to a test lung during the following inspiration.The ACD was attached to an experimental test lung. Apparent dead space by the single-breath test for CO(2) and the amount of CO(2) adsorbed to the carbon filter of the ACD was measured with infrared spectrometry.Apparent dead space was 230 ml larger using the ACD compared with a conventional heat and moisture exchanger (internal volumes 100 and 50 ml, respectively). Varying CO(2) flux to the test lung (85-375 ml min(-1)) did not change the measured dead space nor did varying respiratory rate (12-24 bpm). The ACD contained 3.3 times more CO(2) than the predicted amount present in its internal volume of 100 ml.Our measurements show a CO(2) reservoir effect of 180 ml in excess of the ACD internal volume. This is due to adsorption of CO(2) in the ACD during expiration and return of CO(2) during the following inspiration.
- Published
- 2012
47. Measurement and mathematical modelling of elastic and resistive lung mechanical properties studied at sinusoidal expiratory flow
- Author
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Ulrika Bitzén, Ingegerd Göransson, Lisbet Niklason, and Björn Jonson
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medicine.medical_specialty ,Resistive touchscreen ,Physiology ,business.industry ,Mathematical analysis ,General Medicine ,Sigmoid function ,respiratory system ,Pulmonary compliance ,Surgery ,Physiology (medical) ,V curve ,medicine ,Plethysmograph ,Lung volumes ,Asymptote ,Elasticity (economics) ,business - Abstract
Elastic pressure/volume (P(el) /V) and elastic pressure/resistance (P(el) /R) diagrams reflect parenchymal and bronchial properties, respectively. The objective was to develop a method for determination and mathematical characterization of P(el) /V and P(el) /R relationships, simultaneously studied at sinusoidal flow-modulated vital capacity expirations in a body plethysmograph. Analysis was carried out by iterative parameter estimation based on a composite mathematical model describing a three-segment P(el) /V curve and a hyperbolic P(el) /R curve. The hypothesis was tested that the sigmoid P(el) /V curve is non-symmetric. Thirty healthy subjects were studied. The hypothesis of a non-symmetric P(el) /V curve was verified. Its upper volume asymptote was nearly equal to total lung capacity (TLC), indicating lung stiffness increasing at high lung volume as the main factor limiting TLC at health. The asymptotic minimal resistance of the hyperbolic P(el) /R relationship reflected lung size. A detailed description of both P(el) /V and P(el) /R relationships was simultaneously derived from sinusoidal flow-modulated vital capacity expirations. The nature of the P(el) /V curve merits the use of a non-symmetric P(el) /V model.
- Published
- 2010
48. Observation of γ-delayed 3α breakup of the 15.11 and 12.71 MeV states in 12C
- Author
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A. Maira, G. García, Martín Alcorta, M. Cubero, Henrik B. Jeppesen, C. A. Diget, Oliver S. Kirsebom, Thomas Nilsson, Göran Hugo Nyman, Ángel Perea, K. Riisager, M. Turrión, B. R. Fulton, A. Munoz, L. M. Fraile, Miguel Madurga, Pankaj S. Joshi, Diego Obradors, Björn Jonson, R. Domínguez-Reyes, S. Hyldegaard, M. J. G. Borge, H. O. U. Fynbo, Olof Tengblad, D. Galaviz, Ministerio de Ciencia e Innovación (España), and European Commission
- Subjects
Physics ,Nuclear and High Energy Physics ,Isovector ,Gamma ray ,Alpha particle ,Breakup ,Complete kinematics ,Beta decay ,Nuclear physics ,Deduced γ ransition ,Bound state ,Alpha decay ,Unbound state ,Atomic physics ,Electron scattering - Abstract
6 pags., 4 figs., 2 tabs. -- PACS:27.20.+n25.55.Hp23.20.-g29.85.-c, The reactions 10B (3He, p α α α) at 4.9 MeV and 11B (3He, d α α α) at 8.5 MeV have been used to investigate the γ decay of states in 12C. By measuring the four-body final state in complete kinematics we are able to detect γ transitions indirectly. We find γ transitions from the 15.11 MeV state in 12C to the 12.71, 11.83, 10.3 and 7.65 MeV states followed by their breakup into three α particles. The relative γ-ray branching ratios obtained are (1.2 ± 0.3), (0.32 ± 0.12), (1.4 ± 0.2) and (4.4 ± 0.8) %, respectively, with the remaining (92.7 ± 1.0) % of the γ decays going to the bound states. We obtain Γα / Γ = (2.8 ± 1.2) % for the isospin-forbidden α decay of the 15.11 MeV state. From the 12.71 MeV state we find γ transitions to the 10.3 and 7.65 MeV states. The relative γ-ray branching ratios are (0.9- 0.5 + 0.6) and (2.6- 1.2 + 1.6) %, respectively, with the remaining (96.6- 1.3 + 1.7) % of the γ decays going to the bound states. Finally, we discuss the relation between the β decay of 12N and 12B to states in 12C and the γ decay of the 15.11 MeV analog in 12C to the same states. © 2009 Elsevier B.V., We would like to acknowledge the support of the Spanish CICYT research grant FPA2007-62170 and the MICINN Consolider Project CSD 2007-00042 as well as the support of the European Union VI Framework through RII3-EURONS/JRA4-DLEP (contract number 506065). D.G. is a Juan de la Cierva fellow.
- Published
- 2009
49. EANM guidelines for ventilation/perfusion scintigraphy
- Author
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Marika Bajc, Massimo Miniati, Björn Jonson, C Schuemichen, J. B. Neilly, and Michel Meignan
- Subjects
Male ,medicine.medical_specialty ,Scintigraphy ,Effective dose (radiation) ,Ventilation/perfusion ratio ,Pregnancy ,Ventilation-Perfusion Ratio ,Humans ,Medicine ,Radiology, Nuclear Medicine and imaging ,In patient ,cardiovascular diseases ,Medical diagnosis ,Aged ,Aged, 80 and over ,Tomography, Emission-Computed, Single-Photon ,medicine.diagnostic_test ,business.industry ,General Medicine ,Middle Aged ,medicine.disease ,Pulmonary embolism ,Absorbed dose ,cardiovascular system ,Female ,Radiology ,Radiopharmaceuticals ,Pulmonary Embolism ,Tomography, X-Ray Computed ,business ,Nuclear medicine ,Perfusion ,Algorithms - Abstract
As emphasized in Part 1 of these guidelines, the diagnosis of pulmonary embolism (PE) is confirmed or refuted using ventilation/perfusion scintigraphy (V/P(SCAN)) or multidetector computed tomography of the pulmonary arteries (MDCT). To reduce the costs, the risks associated with false-negative and false-positive diagnoses, and unnecessary radiation exposure, preimaging assessment of clinical probability is recommended. Diagnostic accuracy is approximately equal for MDCT and planar V/P(SCAN) and better for tomography (V/P(SPECT)). V/P(SPECT) is feasible in about 99% of patients, while MDCT is often contraindicated. As MDCT is more readily available, access to both techniques is vital for the diagnosis of PE. V/P(SPECT) gives an effective radiation dose of 1.2-2 mSv. For V/P(SPECT), the effective dose is about 35-40% and the absorbed dose to the female breast 4% of the dose from MDCT performed with a dose-saving protocol. V/P(SPECT) is recommended as a first-line procedure in patients with suspected PE. It is particularly favoured in young patients, especially females, during pregnancy, and for follow-up and research.
- Published
- 2009
50. 11Li structure from experimental data
- Author
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Björn Jonson, Mikhail V. Zhukov, and N. B. Shulgina
- Subjects
Set (abstract data type) ,Physics ,Nuclear and High Energy Physics ,Error bar ,Nuclear structure ,Structure (category theory) ,Experimental data ,Atomic physics ,Wave function ,Ground state ,Computational physics - Abstract
An analytical wave function for the 11Li ground state is constructed in a three-body 9Li + n + n approach. Its parameters are fixed from the fit to the set of most accurate experimental data and tested on all other available data. The obtained 11Li ground state wave function allows to describe all considered experimental data within their error bars simultaneously. The main contributions to the 11Li ground state wave function are found to come from (s1 / 2)2 (37%) and (p1 / 2)2 (47%) components.
- Published
- 2009
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