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Favaretto C, Grundler PV, Talip Z, Köster U, Johnston K, Busslinger SD, Sprung P, Hillhouse CC, Eichler R, Schibli R, Müller C, van der Meulen NP. Terbium-149 production: a focus on yield and quality improvement towards preclinical application. Sci Rep 2024; 14:3284. [PMID: 38332245 PMCID: PMC10853284 DOI: 10.1038/s41598-024-53610-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 02/02/2024] [Indexed: 02/10/2024] Open
Abstract
Terbium-149 (T1/2 = 4.1 h, Eα = 3.98 MeV (16.7%), 28 µm range in tissue) is a radionuclide with potential for targeted alpha therapy. Due to the negligible emission of α-emitting daughter nuclides, toxicity to healthy tissue may be reduced in comparison with other α-particle emitters. In this study, terbium-149 was produced via 1.4 GeV proton irradiation of a tantalum target at the CERN-ISOLDE facility. The spallation products were mass separated and implanted on zinc-coated foils and, later, radiochemically processed. Terbium-149 was separated from the co-produced isobaric radioisotopes and the zinc coating from the implantation foil, using cation-exchange and extraction chromatographic techniques, respectively. At the end of separation, up to 260 MBq terbium-149 were obtained with > 99% radionuclidic purity. Radiolabeling experiments were performed with DOTATATE, achieving 50 MBq/nmol apparent molar activity with radiochemical purity > 99%. The chemical purity was determined by inductively coupled plasma-mass spectrometry measurements, which showed lead, copper, iron and zinc only at ppb level. The radiolabeling of the somatostatin analogue DOTATATE with [149Tb]TbCl3 and the subsequent in vivo PET/CT scans conducted in xenografted mice, showing good tumor uptake, further demonstrated product quality and its ability to be used in a preclinical setting.
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Affiliation(s)
- C Favaretto
- Nuclear Medicine Department, University Hospital Basel, Basel, Switzerland
- Center for Radiopharmaceutical Sciences ETH-PSI, Paul Scherrer Institute, 5232, Villigen-PSI, Switzerland
| | - P V Grundler
- Center for Radiopharmaceutical Sciences ETH-PSI, Paul Scherrer Institute, 5232, Villigen-PSI, Switzerland
| | - Z Talip
- Center for Radiopharmaceutical Sciences ETH-PSI, Paul Scherrer Institute, 5232, Villigen-PSI, Switzerland
| | - U Köster
- Institute Laue-Langevin, Grenoble, France
- Physics Department, ISOLDE/CERN, Geneva, Switzerland
| | - K Johnston
- Physics Department, ISOLDE/CERN, Geneva, Switzerland
| | - S D Busslinger
- Center for Radiopharmaceutical Sciences ETH-PSI, Paul Scherrer Institute, 5232, Villigen-PSI, Switzerland
| | - P Sprung
- Department Hot Laboratory, Paul Scherrer Institute, Villigen-PSI, Switzerland
| | - C C Hillhouse
- Laboratory of Radiochemistry, Paul Scherrer Institute, Villigen-PSI, Switzerland
| | - R Eichler
- Laboratory of Radiochemistry, Paul Scherrer Institute, Villigen-PSI, Switzerland
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, Switzerland
| | - R Schibli
- Center for Radiopharmaceutical Sciences ETH-PSI, Paul Scherrer Institute, 5232, Villigen-PSI, Switzerland
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland
| | - C Müller
- Center for Radiopharmaceutical Sciences ETH-PSI, Paul Scherrer Institute, 5232, Villigen-PSI, Switzerland
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland
| | - N P van der Meulen
- Center for Radiopharmaceutical Sciences ETH-PSI, Paul Scherrer Institute, 5232, Villigen-PSI, Switzerland.
- Laboratory of Radiochemistry, Paul Scherrer Institute, Villigen-PSI, Switzerland.
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2
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Majumder A, Pulhani AK, Ghosh A, Singh P, Maiti N. Need for enrichment of lutetium isotope and design of a laser based separator module. Appl Radiat Isot 2023; 202:111038. [PMID: 37812857 DOI: 10.1016/j.apradiso.2023.111038] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 09/21/2023] [Accepted: 09/21/2023] [Indexed: 10/11/2023]
Abstract
Lutetium-177 radio-pharmaceutical has become an important theranostic candidate in cancer treatment. Its availability from bench-to-bed requires strategic implementation of isotope-enrichment, neutron-irradiation and radio-chemical techniques. In this paper, the need for enrichment of lutetium-176 is emphasized by estimating specific activity of lutetium-177 as a function of enrichment percentage for typical neutron flux available at Dhruva reactor, India. A novel Atomic Vapour Laser Isotope Separation (AVLIS) module for lutetium-176 enrichment is designed to meet the above requirement. The paper documents its characteristics and production estimates. The design is carried out after critical assessment and evaluation of available AVLIS-infrastructure in the country. Outline of lutetium-177 enrichment, capable of producing non-carrier-added lutetium is also provided. This work concludes that India has taken a step forward towards self-reliance (Atmanirbhar Bharat) in securing the supply chain of lutetium-177.
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Affiliation(s)
- A Majumder
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - A K Pulhani
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - A Ghosh
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Mumbai, 400085, India
| | - P Singh
- Homi Bhabha National Institute, Mumbai, 400085, India
| | - N Maiti
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Mumbai, 400085, India
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3
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Manea V, Karthein J, Atanasov D, Bender M, Blaum K, Cocolios TE, Eliseev S, Herlert A, Holt JD, Huang WJ, Litvinov YA, Lunney D, Menéndez J, Mougeot M, Neidherr D, Schweikhard L, Schwenk A, Simonis J, Welker A, Wienholtz F, Zuber K. First Glimpse of the N=82 Shell Closure below Z=50 from Masses of Neutron-Rich Cadmium Isotopes and Isomers. PHYSICAL REVIEW LETTERS 2020; 124:092502. [PMID: 32202869 DOI: 10.1103/physrevlett.124.092502] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
We probe the N=82 nuclear shell closure by mass measurements of neutron-rich cadmium isotopes with the ISOLTRAP spectrometer at ISOLDE-CERN. The new mass of ^{132}Cd offers the first value of the N=82, two-neutron shell gap below Z=50 and confirms the phenomenon of mutually enhanced magicity at ^{132}Sn. Using the recently implemented phase-imaging ion-cyclotron-resonance method, the ordering of the low-lying isomers in ^{129}Cd and their energies are determined. The new experimental findings are used to test large-scale shell-model, mean-field, and beyond-mean-field calculations, as well as the ab initio valence-space in-medium similarity renormalization group.
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Affiliation(s)
- V Manea
- CERN, 1211 Geneva 23, Switzerland
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
- Instituut voor Kern-en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
| | - J Karthein
- CERN, 1211 Geneva 23, Switzerland
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - D Atanasov
- Technische Universität Dresden, 01069 Dresden, Germany
| | - M Bender
- IP2I Lyon, CNRS/IN2P3, Université de Lyon, Université Claude Bernard Lyon 1, F-69622 Villeurbanne, France
| | - K Blaum
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - T E Cocolios
- Instituut voor Kern-en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
| | - S Eliseev
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | | | - J D Holt
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
| | - W J Huang
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91406 Orsay, France
| | - Yu A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - D Lunney
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91406 Orsay, France
| | - J Menéndez
- Center for Nuclear Study, The University of Tokyo, 113-0033 Tokyo, Japan
- Department de Física Quàntica i Astrofísica, Universitat de Barcelona, 08028 Barcelona, Spain
| | - M Mougeot
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91406 Orsay, France
| | - D Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - L Schweikhard
- Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany
| | - A Schwenk
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - J Simonis
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Institut für Kernphysik and PRISMA Cluster of Excellence, Johannes Gutenberg-Universität, 55099 Mainz, Germany
| | - A Welker
- CERN, 1211 Geneva 23, Switzerland
- Technische Universität Dresden, 01069 Dresden, Germany
| | - F Wienholtz
- CERN, 1211 Geneva 23, Switzerland
- Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany
| | - K Zuber
- Technische Universität Dresden, 01069 Dresden, Germany
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Andreyev AN, Nishio K, Schmidt KH. Nuclear fission: a review of experimental advances and phenomenology. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:016301. [PMID: 28753131 DOI: 10.1088/1361-6633/aa82eb] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the last two decades, through technological, experimental and theoretical advances, the situation in experimental fission studies has changed dramatically. With the use of advanced production and detection techniques both much more detailed and precise information can now be obtained for the traditional regions of fission research and, crucially, new regions of nuclei have become routinely accessible for fission studies. This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams. The emphasis on the fission-fragment mass and charge distributions will be made in this work, though some of the other fission observables, such as prompt neutron and γ-ray emission will also be reviewed. A particular attention will be given to the low-energy fission in the so far scarcely explored nuclei in the very neutron-deficient lead region. They recently became the focus for several complementary experimental studies, such as β-delayed fission with radioactive beams at ISOLDE(CERN), Coulex-induced fission of relativistic secondary beams at FRS(GSI), and several prompt fusion-fission studies. The synergy of these approaches allows a unique insight in the new region of asymmetric fission around [Formula: see text]Hg, recently discovered at ISOLDE. Recent extensive theoretical efforts in this region will also be outlined. The unprecedented high-quality data for fission fragments, completely identified in Z and A, by means of reactions in inverse kinematics at FRS(GSI) and VAMOS(GANIL) will be also reviewed. These experiments explored an extended range of mercury-to-californium elements, spanning from the neutron-deficient to neutron-rich nuclides, and covering both asymmetric, symmetric and transitional fission regions. Some aspects of heavy-ion induced fusion-fission and quasifission reactions will be also discussed, which reveal their dynamical features, such as the fission time scale. The crucial role of the multi-chance fission, probed by means of multinucleon-transfer induced fission reactions, will be highlighted. The review will conclude with the discussion of the new experimental fission facilities which are presently being brought into operation, along with promising 'next-generation' fission approaches, which might become available within the next decade.
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Affiliation(s)
- A N Andreyev
- Department of Physics, University of York, York, YO10 5DD, United Kingdom. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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5
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Welker A, Althubiti NAS, Atanasov D, Blaum K, Cocolios TE, Herfurth F, Kreim S, Lunney D, Manea V, Mougeot M, Neidherr D, Nowacki F, Poves A, Rosenbusch M, Schweikhard L, Wienholtz F, Wolf RN, Zuber K. Binding Energy of ^{79}Cu: Probing the Structure of the Doubly Magic ^{78}Ni from Only One Proton Away. PHYSICAL REVIEW LETTERS 2017; 119:192502. [PMID: 29219497 DOI: 10.1103/physrevlett.119.192502] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Indexed: 06/07/2023]
Abstract
The masses of the neutron-rich copper isotopes ^{75-79}Cu are determined using the precision mass spectrometer ISOLTRAP at the CERN-ISOLDE facility. The trend from the new data differs significantly from that of previous results, offering a first accurate view of the mass surface adjacent to the Z=28, N=50 nuclide ^{78}Ni and supporting a doubly magic character. The new masses compare very well with large-scale shell-model calculations that predict shape coexistence in a doubly magic ^{78}Ni and a new island of inversion for Z<28. A coherent picture of this important exotic region begins to emerge where excitations across Z=28 and N=50 form a delicate equilibrium with a spherical mean field.
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Affiliation(s)
- A Welker
- Technische Universität Dresden, 01069 Dresden, Germany
- CERN Geneva, 1211 Geneva, Switzerland
| | - N A S Althubiti
- University of Manchester, Manchester M13 9PL, United Kingdom
| | - D Atanasov
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - T E Cocolios
- KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - S Kreim
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - D Lunney
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - V Manea
- CERN Geneva, 1211 Geneva, Switzerland
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - M Mougeot
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - D Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - F Nowacki
- Université de Strasbourg, IPHC, 67037 Strasbourg, France
- CNRS, UMR7178, 67037 Strasbourg, France
| | - A Poves
- Departamento de Física Teórica and IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
- Institute for Advanced Study, Université de Strasbourg, 67083 Strasbourg, France
| | - M Rosenbusch
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - L Schweikhard
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - F Wienholtz
- CERN Geneva, 1211 Geneva, Switzerland
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - R N Wolf
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - K Zuber
- Technische Universität Dresden, 01069 Dresden, Germany
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6
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Zemlyanoy S, Avvakumov K, Kozulin E, Fedosseev V, Bark R, Janas Z. Production and investigation of heavy neutron rich nuclei. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201716300065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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7
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Yang XF, Wraith C, Xie L, Babcock C, Billowes J, Bissell ML, Blaum K, Cheal B, Flanagan KT, Garcia Ruiz RF, Gins W, Gorges C, Grob LK, Heylen H, Kaufmann S, Kowalska M, Kraemer J, Malbrunot-Ettenauer S, Neugart R, Neyens G, Nörtershäuser W, Papuga J, Sánchez R, Yordanov DT. Isomer Shift and Magnetic Moment of the Long-Lived 1/2^{+} Isomer in _{30}^{79}Zn_{49}: Signature of Shape Coexistence near ^{78}Ni. PHYSICAL REVIEW LETTERS 2016; 116:182502. [PMID: 27203317 DOI: 10.1103/physrevlett.116.182502] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Indexed: 06/05/2023]
Abstract
Collinear laser spectroscopy is performed on the _{30}^{79}Zn_{49} isotope at ISOLDE-CERN. The existence of a long-lived isomer with a few hundred milliseconds half-life is confirmed, and the nuclear spins and moments of the ground and isomeric states in ^{79}Zn as well as the isomer shift are measured. From the observed hyperfine structures, spins I=9/2 and I=1/2 are firmly assigned to the ground and isomeric states. The magnetic moment μ (^{79}Zn)=-1.1866(10)μ_{N}, confirms the spin-parity 9/2^{+} with a νg_{9/2}^{-1} shell-model configuration, in excellent agreement with the prediction from large scale shell-model theories. The magnetic moment μ (^{79m}Zn)=-1.0180(12)μ_{N} supports a positive parity for the isomer, with a wave function dominated by a 2h-1p neutron excitation across the N=50 shell gap. The large isomer shift reveals an increase of the intruder isomer mean square charge radius with respect to that of the ground state, δ⟨r_{c}^{2}⟩^{79,79m}=+0.204(6) fm^{2}, providing first evidence of shape coexistence.
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Affiliation(s)
- X F Yang
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - C Wraith
- Oliver Lodge Laboratory, Oxford Street, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - L Xie
- School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - C Babcock
- Oliver Lodge Laboratory, Oxford Street, University of Liverpool, Liverpool L69 7ZE, United Kingdom
- EN Department, CERN, CH-1211 Geneva 23, Switzerland
| | - J Billowes
- School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - M L Bissell
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
- School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - K Blaum
- Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany
| | - B Cheal
- Oliver Lodge Laboratory, Oxford Street, University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - K T Flanagan
- School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - R F Garcia Ruiz
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - W Gins
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - C Gorges
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
| | - L K Grob
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland
| | - H Heylen
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - S Kaufmann
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
| | - M Kowalska
- Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland
| | - J Kraemer
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
| | | | - R Neugart
- Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany
- Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
| | - G Neyens
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - W Nörtershäuser
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
| | - J Papuga
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - R Sánchez
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - D T Yordanov
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay, France
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Raeder S, Heggen H, Lassen J, Ames F, Bishop D, Bricault P, Kunz P, Mjøs A, Teigelhöfer A. An ion guide laser ion source for isobar-suppressed rare isotope beams. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:033309. [PMID: 24689577 DOI: 10.1063/1.4868496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Modern experiments at isotope separator on-line (ISOL) facilities like ISAC at TRIUMF often depend critically on the purity of the delivered rare isotope beams. Therefore, highly selective ion sources are essential. This article presents the development and successful on-line operation of an ion guide laser ion source (IG-LIS) for the production of ion beams free of isobaric contamination. Thermionic ions from the hot ISOL target are suppressed by an electrostatic potential barrier, while neutral radio nuclides effusing out are resonantly ionized by laser radiation within a quadrupole ion guide behind this barrier. The IG-LIS was developed through detailed thermal and ion optics simulation studies and off-line tests with stable isotopes. In a first on-line run with a SiC target a suppression of surface-ionized Na contaminants in the ion beam of up to six orders of magnitude was demonstrated.
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Affiliation(s)
- Sebastian Raeder
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Henning Heggen
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Jens Lassen
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Friedhelm Ames
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Daryl Bishop
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Pierre Bricault
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Peter Kunz
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Anders Mjøs
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
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9
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Measurement of the first ionization potential of astatine by laser ionization spectroscopy. Nat Commun 2013; 4:1835. [PMID: 23673620 PMCID: PMC3674244 DOI: 10.1038/ncomms2819] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Accepted: 03/27/2013] [Indexed: 01/07/2023] Open
Abstract
The radioactive element astatine exists only in trace amounts in nature. Its properties can therefore only be explored by study of the minute quantities of artificially produced isotopes or by performing theoretical calculations. One of the most important properties influencing the chemical behaviour is the energy required to remove one electron from the valence shell, referred to as the ionization potential. Here we use laser spectroscopy to probe the optical spectrum of astatine near the ionization threshold. The observed series of Rydberg states enabled the first determination of the ionization potential of the astatine atom, 9.31751(8) eV. New ab initio calculations are performed to support the experimental result. The measured value serves as a benchmark for quantum chemistry calculations of the properties of astatine as well as for the theoretical prediction of the ionization potential of superheavy element 117, the heaviest homologue of astatine.
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10
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Masses of exotic calcium isotopes pin down nuclear forces. Nature 2013; 498:346-9. [PMID: 23783629 DOI: 10.1038/nature12226] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 04/23/2013] [Indexed: 11/08/2022]
Abstract
The properties of exotic nuclei on the verge of existence play a fundamental part in our understanding of nuclear interactions. Exceedingly neutron-rich nuclei become sensitive to new aspects of nuclear forces. Calcium, with its doubly magic isotopes (40)Ca and (48)Ca, is an ideal test for nuclear shell evolution, from the valley of stability to the limits of existence. With a closed proton shell, the calcium isotopes mark the frontier for calculations with three-nucleon forces from chiral effective field theory. Whereas predictions for the masses of (51)Ca and (52)Ca have been validated by direct measurements, it is an open question as to how nuclear masses evolve for heavier calcium isotopes. Here we report the mass determination of the exotic calcium isotopes (53)Ca and (54)Ca, using the multi-reflection time-of-flight mass spectrometer of ISOLTRAP at CERN. The measured masses unambiguously establish a prominent shell closure at neutron number N = 32, in excellent agreement with our theoretical calculations. These results increase our understanding of neutron-rich matter and pin down the subtle components of nuclear forces that are at the forefront of theoretical developments constrained by quantum chromodynamics.
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11
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Wolf RN, Beck D, Blaum K, Böhm C, Borgmann C, Breitenfeldt M, Chamel N, Goriely S, Herfurth F, Kowalska M, Kreim S, Lunney D, Manea V, Minaya Ramirez E, Naimi S, Neidherr D, Rosenbusch M, Schweikhard L, Stanja J, Wienholtz F, Zuber K. Plumbing neutron stars to new depths with the binding energy of the exotic nuclide 82Zn. PHYSICAL REVIEW LETTERS 2013; 110:041101. [PMID: 25166148 DOI: 10.1103/physrevlett.110.041101] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Indexed: 06/03/2023]
Abstract
Modeling the composition of neutron-star crusts depends strongly on binding energies of neutron-rich nuclides near the N = 50 and N = 82 shell closures. Using a recent development of time-of-flight mass spectrometry for on-line purification of radioactive ion beams to access more exotic species, we have determined for the first time the mass of (82)Zn with the ISOLTRAP setup at the ISOLDE-CERN facility. With a robust neutron-star model based on nuclear energy-density-functional theory, we solve the general relativistic Tolman-Oppenheimer-Volkoff equations and calculate the neutron-star crust composition based on the new experimental mass. The composition profile is not only altered but now constrained by experimental data deeper into the crust than before.
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Affiliation(s)
- R N Wolf
- Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
| | - D Beck
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Ch Böhm
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Ch Borgmann
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - M Breitenfeldt
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200d, B-3001 Heverlee, Belgium
| | - N Chamel
- Institut d'Astronomie et d'Astrophysique, CP-226, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - S Goriely
- Institut d'Astronomie et d'Astrophysique, CP-226, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | | | - S Kreim
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany and CERN, 1211 Geneva 23, Switzerland
| | - D Lunney
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - V Manea
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - E Minaya Ramirez
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany and Helmholtz-Institut Mainz, 55099 Mainz, Germany
| | - S Naimi
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France and RIKEN Nishina Center for Accelerator-based Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - D Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany and Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - M Rosenbusch
- Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
| | - L Schweikhard
- Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
| | - J Stanja
- Institut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany
| | - F Wienholtz
- Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
| | - K Zuber
- Institut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany
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