1
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Mougeot M, Atanasov D, Blaum K, Chrysalidis K, Goodacre TD, Fedorov D, Fedosseev V, George S, Herfurth F, Holt JD, Lunney D, Manea V, Marsh B, Neidherr D, Rosenbusch M, Rothe S, Schweikhard L, Schwenk A, Seiffert C, Simonis J, Stroberg SR, Welker A, Wienholtz F, Wolf RN, Zuber K. Precision Mass Measurements of ^{58-63}Cr: Nuclear Collectivity Towards the N=40 Island of Inversion. Phys Rev Lett 2018; 120:232501. [PMID: 29932682 DOI: 10.1103/physrevlett.120.232501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 03/06/2018] [Indexed: 06/08/2023]
Abstract
The neutron-rich isotopes ^{58-63}Cr were produced for the first time at the ISOLDE facility and their masses were measured with the ISOLTRAP spectrometer. The new values are up to 300 times more precise than those in the literature and indicate significantly different nuclear structure from the new mass-surface trend. A gradual onset of deformation is found in this proton and neutron midshell region, which is a gateway to the second island of inversion around N=40. In addition to comparisons with density-functional theory and large-scale shell-model calculations, we present predictions from the valence-space formulation of the ab initio in-medium similarity renormalization group, the first such results for open-shell chromium isotopes.
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Affiliation(s)
- M Mougeot
- CSNSM-IN2P3-CNRS, Université Paris-Sud, Orsay 91405, France
| | - D Atanasov
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117, Germany
| | - K Chrysalidis
- CERN, Geneva 1211, Switzerland
- Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany
| | - T Day Goodacre
- CERN, Geneva 1211, Switzerland
- School of Physics Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - D Fedorov
- Petersburg Nuclear Physics Institute, Gatchina 188300, Russia
| | | | - S George
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117, Germany
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - J D Holt
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - D Lunney
- CSNSM-IN2P3-CNRS, Université Paris-Sud, Orsay 91405, France
| | - V Manea
- CERN, Geneva 1211, Switzerland
| | - B Marsh
- CERN, Geneva 1211, Switzerland
| | - D Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - M Rosenbusch
- Universität Greifswald, Institut für Physik, Greifswald 17487, Germany
| | - S Rothe
- CERN, Geneva 1211, Switzerland
| | - L Schweikhard
- Universität Greifswald, Institut für Physik, Greifswald 17487, Germany
| | - A Schwenk
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt 64289, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | | | - J Simonis
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt 64289, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
- Institut für Kernphysik and PRISMA Cluster of Excellence, Johannes Gutenberg-Universität, Mainz 55099, Germany
| | - S R Stroberg
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Welker
- Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden 01069, Germany
| | - F Wienholtz
- Universität Greifswald, Institut für Physik, Greifswald 17487, Germany
| | - R N Wolf
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117, Germany
| | - K Zuber
- Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden 01069, Germany
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2
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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. Phys Rev Lett 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] [What about the content of this article? (0)] [Affiliation(s)] [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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3
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Welker A, Althubiti N, Atanasov D, Blaum K, Herfurth F, Kreim S, Koester U, Lunney D, Mougeot M, Manea V, Neidherr D, Rosenbusch M, Schweikhard L, Wienholtz F, Wolf R, Zuber K. Yield study and optimization of nuclear isotopes for cancer treatment and diagnostics with ISOLTRAP/CERN. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)30232-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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4
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Atanasov D, Ascher P, Blaum K, Cakirli RB, Cocolios TE, George S, Goriely S, Herfurth F, Janka HT, Just O, Kowalska M, Kreim S, Kisler D, Litvinov YA, Lunney D, Manea V, Neidherr D, Rosenbusch M, Schweikhard L, Welker A, Wienholtz F, Wolf RN, Zuber K. Precision Mass Measurements of ^{129-131}Cd and Their Impact on Stellar Nucleosynthesis via the Rapid Neutron Capture Process. Phys Rev Lett 2015; 115:232501. [PMID: 26684113 DOI: 10.1103/physrevlett.115.232501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Indexed: 06/05/2023]
Abstract
Masses adjacent to the classical waiting-point nuclide ^{130}Cd have been measured by using the Penning-trap spectrometer ISOLTRAP at ISOLDE/CERN. We find a significant deviation of over 400 keV from earlier values evaluated by using nuclear beta-decay data. The new measurements show the reduction of the N=82 shell gap below the doubly magic ^{132}Sn. The nucleosynthesis associated with the ejected wind from type-II supernovae as well as from compact object binary mergers is studied, by using state-of-the-art hydrodynamic simulations. We find a consistent and direct impact of the newly measured masses on the calculated abundances in the A=128-132 region and a reduction of the uncertainties from the precision mass input data.
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Affiliation(s)
- D Atanasov
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - P Ascher
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - R B Cakirli
- Department of Physics, University of Istanbul, 34134 Istanbul, Turkey
| | - T E Cocolios
- University of Manchester, Manchester M13 9PL, United Kingdom
| | - S George
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - S Goriely
- Institut d'Astronomie et d'Astrophysique, CP-226, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - H-T Janka
- Max-Planck-Institut für Astrophysik, Postfach 1317, 85741 Garching, Germany
| | - O Just
- Max-Planck-Institut für Astrophysik, Postfach 1317, 85741 Garching, Germany
| | | | - S Kreim
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- CERN, 1211 Geneva, Switzerland
| | - D Kisler
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - Yu A Litvinov
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - D Lunney
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - V Manea
- CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
| | - D Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - M Rosenbusch
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - L Schweikhard
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - A Welker
- Technische Universität Dresden, 01069 Dresden, Germany
| | - F Wienholtz
- Ernst-Moritz-Arndt-Universität, Institut für Physik, 17487 Greifswald, Germany
| | - R N Wolf
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - K Zuber
- Technische Universität Dresden, 01069 Dresden, Germany
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5
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Rosenbusch M, Ascher P, Atanasov D, Barbieri C, Beck D, Blaum K, Borgmann C, Breitenfeldt M, Cakirli RB, Cipollone A, George S, Herfurth F, Kowalska M, Kreim S, Lunney D, Manea V, Navrátil P, Neidherr D, Schweikhard L, Somà V, Stanja J, Wienholtz F, Wolf RN, Zuber K. Probing the N=32 Shell Closure below the Magic Proton Number Z=20: Mass Measurements of the Exotic Isotopes ^{52,53}K. Phys Rev Lett 2015; 114:202501. [PMID: 26047224 DOI: 10.1103/physrevlett.114.202501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Indexed: 06/04/2023]
Abstract
The recently confirmed neutron-shell closure at N=32 has been investigated for the first time below the magic proton number Z=20 with mass measurements of the exotic isotopes (52,53)K, the latter being the shortest-lived nuclide investigated at the online mass spectrometer ISOLTRAP. The resulting two-neutron separation energies reveal a 3 MeV shell gap at N=32, slightly lower than for 52Ca, highlighting the doubly magic nature of this nuclide. Skyrme-Hartree-Fock-Bogoliubov and ab initio Gorkov-Green function calculations are challenged by the new measurements but reproduce qualitatively the observed shell effect.
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Affiliation(s)
- M Rosenbusch
- Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
| | - P Ascher
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - D Atanasov
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - C Barbieri
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - 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 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
| | - R B Cakirli
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Department of Physics, University of Istanbul, 34134 Istanbul, Turkey
| | - A Cipollone
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - S George
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | | | - S Kreim
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- 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
| | - P Navrátil
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - D Neidherr
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - L Schweikhard
- Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
| | - V Somà
- CEA-Saclay, IRFU/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, 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
| | - R N Wolf
- Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - K Zuber
- Institut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany
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6
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Chen W, Vorobyev G, Guo D, Herfurth F, Hillenbrand PM, Spillmann U, Trotsenko S, Gumberidze A, Stöhlker T. Metal vapor target for precise studies of ion-atom collisions. Rev Sci Instrum 2014; 85:053513. [PMID: 24880375 DOI: 10.1063/1.4878626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Although different ion-atom collisions have been studied in various contexts, precise values of cross-sections for many atomic processes were seldom obtained. One of the main uncertainties originates from the value of target densities. In this paper, we describe a unique method to measure a target density precisely with a combination of physical vapor deposition and inductively coupled plasma optical emission spectrometry. This method is preliminarily applied to a charge transfer cross-section measurement in collisions between highly charged ions and magnesium vapor. The final relative uncertainty of the target density is less than 2.5%. This enables the precise studies of atomic processes in ion-atom collisions, even though in the trial test the deduction of precise capture cross-sections was limited by other systematic errors.
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Affiliation(s)
- W Chen
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - G Vorobyev
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - D Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000 Gansu, China
| | - F Herfurth
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - P-M Hillenbrand
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - U Spillmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - S Trotsenko
- Helmholtz-Institut Jena Fröbelstieg 3, 07743 Jena, Germany
| | - A Gumberidze
- ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - Th Stöhlker
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
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7
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Wienholtz F, Beck D, Blaum K, Borgmann C, Breitenfeldt M, Cakirli RB, George S, Herfurth F, Holt JD, Kowalska M, Kreim S, Lunney D, Manea V, Menéndez J, Neidherr D, Rosenbusch M, Schweikhard L, Schwenk A, Simonis J, Stanja J, Wolf RN, Zuber K. Erratum: Masses of exotic calcium isotopes pin down nuclear forces. Nature 2013. [DOI: 10.1038/nature12431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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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. Phys Rev Lett 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] [What about the content of this article? (0)] [Affiliation(s)] [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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9
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Minaya Ramirez E, Ackermann D, Blaum K, Block M, Droese C, Düllmann CE, Dworschak M, Eibach M, Eliseev S, Haettner E, Herfurth F, Heßberger FP, Hofmann S, Ketelaer J, Marx G, Mazzocco M, Nesterenko D, Novikov YN, Plaß WR, Rodríguez D, Scheidenberger C, Schweikhard L, Thirolf PG, Weber C. Direct mapping of nuclear shell effects in the heaviest elements. Science 2012; 337:1207-10. [PMID: 22878498 DOI: 10.1126/science.1225636] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Quantum-mechanical shell effects are expected to strongly enhance nuclear binding on an "island of stability" of superheavy elements. The predicted center at proton number Z = 114, 120, or 126 and neutron number N = 184 has been substantiated by the recent synthesis of new elements up to Z = 118. However, the location of the center and the extension of the island of stability remain vague. High-precision mass spectrometry allows the direct measurement of nuclear binding energies and thus the determination of the strength of shell effects. Here, we present such measurements for nobelium and lawrencium isotopes, which also pin down the deformed shell gap at N = 152.
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10
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Vorobjev G, Sokolov A, Thorn A, Herfurth F, Kester O, Quint W, Stöhlker T, Zschornack G. Demonstration of charge breeding in a compact room temperature electron beam ion trap. Rev Sci Instrum 2012; 83:053302. [PMID: 22667612 DOI: 10.1063/1.4719668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
For the first time, a small room-temperature electron beam ion trap (EBIT), operated with permanent magnets, was successfully used for charge breeding experiments. The relatively low magnetic field of this EBIT does not contribute to the capture of the ions; single-charged ions are only caught by the space charge potential of the electron beam. An over-barrier injection method was used to fill the EBIT's electrostatic trap with externally produced, single-charged potassium ions. Charge states as high as K(19+) were reached after about a 3 s breeding time. The capture and breeding efficiencies up to 0.016(4)% for K(17+) have been measured.
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Affiliation(s)
- G Vorobjev
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291 Darmstadt, Germany.
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11
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Fink D, Barea J, Beck D, Blaum K, Böhm C, Borgmann C, Breitenfeldt M, Herfurth F, Herlert A, Kotila J, Kowalska M, Kreim S, Lunney D, Naimi S, Rosenbusch M, Schwarz S, Schweikhard L, Simkovic F, Stanja J, Zuber K. Q value and half-lives for the double-β-decay nuclide 110Pd. Phys Rev Lett 2012; 108:062502. [PMID: 22401059 DOI: 10.1103/physrevlett.108.062502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 01/17/2012] [Indexed: 05/31/2023]
Abstract
The 110Pd double-β decay Q value was measured with the Penning-trap mass spectrometer ISOLTRAP to be Q=2017.85(64) keV. This value shifted by 14 keV compared with the literature value and is 17 times more precise, resulting in new phase-space factors for the two-neutrino and neutrinoless decay modes. In addition a new set of the relevant matrix elements has been calculated. The expected half-life of the two-neutrino mode was reevaluated as 1.5(6)×10(20) yr. With its high natural abundance, the new results reveal 110Pd to be an excellent candidate for double-β decay studies.
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Affiliation(s)
- D Fink
- Max-Planck-Institut für Kernphysik, Heidelberg, Germany
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12
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Eliseev S, Roux C, Blaum K, Block M, Droese C, Herfurth F, Kretzschmar M, Krivoruchenko MI, Minaya Ramirez E, Novikov YN, Schweikhard L, Shabaev VM, Simkovic F, Tupitsyn II, Zuber K, Zubova NA. Octupolar-excitation Penning-trap mass spectrometry for Q-value measurement of double-electron capture in (164)Er. Phys Rev Lett 2011; 107:152501. [PMID: 22107289 DOI: 10.1103/physrevlett.107.152501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Indexed: 05/31/2023]
Abstract
The theory of octupolar-excitation ion-cyclotron-resonance mass spectrometry is presented which predicts an increase of up to several orders of magnitude in resolving power under certain conditions. The new method has been applied for a direct Penning-trap mass-ratio determination of the (164)Er-(164)Dy mass doublet. (164)Er is a candidate for the search for neutrinoless double-electron capture. However, the measured Q(ϵϵ) value of 25.07(12) keV results in a half-life of 10(30) years for a 1 eV Majorana-neutrino mass.
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Affiliation(s)
- S Eliseev
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
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13
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Haettner E, Ackermann D, Audi G, Blaum K, Block M, Eliseev S, Fleckenstein T, Herfurth F, Hessberger FP, Hofmann S, Ketelaer J, Ketter J, Kluge HJ, Marx G, Mazzocco M, Novikov YN, Plass WR, Rahaman S, Rauscher T, Rodríguez D, Schatz H, Scheidenberger C, Schweikhard L, Sun B, Thirolf PG, Vorobjev G, Wang M, Weber C. Mass measurements of very neutron-deficient Mo and Tc isotopes and their impact on rp process nucleosynthesis. Phys Rev Lett 2011; 106:122501. [PMID: 21517310 DOI: 10.1103/physrevlett.106.122501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Indexed: 05/30/2023]
Abstract
The masses of ten proton-rich nuclides, including the N=Z+1 nuclides ⁸⁵Mo and ⁸⁷Tc, were measured with the Penning trap mass spectrometer SHIPTRAP. Compared to the Atomic Mass Evaluation 2003 a systematic shift of the mass surface by up to 1.6 MeV is observed causing significant abundance changes of the ashes of astrophysical x-ray bursts. Surprisingly low α separation energies for neutron-deficient Mo and Tc are found, making the formation of a ZrNb cycle in the rp process possible. Such a cycle would impose an upper temperature limit for the synthesis of elements beyond Nb in the rp process.
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Affiliation(s)
- E Haettner
- II. Physikalisches Institut, Justus-Liebig-Universität, 35392 Gießen, Germany.
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14
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Eliseev S, Roux C, Blaum K, Block M, Droese C, Herfurth F, Kluge HJ, Krivoruchenko MI, Novikov YN, Minaya Ramirez E, Schweikhard L, Shabaev VM, Simkovic F, Tupitsyn II, Zuber K, Zubova NA. Resonant enhancement of neutrinoless double-electron capture in 152Gd. Phys Rev Lett 2011; 106:052504. [PMID: 21405389 DOI: 10.1103/physrevlett.106.052504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Indexed: 05/30/2023]
Abstract
In the search for the nuclide with the largest probability for neutrinoless double-electron capture, we have determined the Q(ϵϵ) value between the ground states of (152)Gd and (152)Sm by Penning-trap mass-ratio measurements. The new Q(ϵϵ) value of 55.70(18) keV results in a half-life of 10(26) yr for a 1 eV neutrino mass. With this smallest half-life among known 0νϵϵ transitions, (152)Gd is a promising candidate for the search for neutrinoless double-electron capture.
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Affiliation(s)
- S Eliseev
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
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15
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Naimi S, Audi G, Beck D, Blaum K, Böhm C, Borgmann C, Breitenfeldt M, George S, Herfurth F, Herlert A, Kowalska M, Kreim S, Lunney D, Neidherr D, Rosenbusch M, Schwarz S, Schweikhard L, Zuber K. Critical-point boundary for the nuclear quantum phase transition near A=100 from mass measurements of (96,97)Kr. Phys Rev Lett 2010; 105:032502. [PMID: 20867760 DOI: 10.1103/physrevlett.105.032502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Indexed: 05/29/2023]
Abstract
Mass measurements of (96,97)Kr using the ISOLTRAP Penning-trap spectrometer at CERN-ISOLDE are reported, extending the mass surface beyond N=60 for Z=36. These new results show behavior in sharp contrast to the heavier neighbors where a sudden and intense deformation is present. We interpret this as the establishment of a nuclear quantum phase transition critical-point boundary. The new masses confirm findings from nuclear mean-square charge-radius measurements up to N=60 but are at variance with conclusions from recent gamma-ray spectroscopy.
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Affiliation(s)
- S Naimi
- CSNSM-IN2P3-CNRS, Université de Paris Sud, 91405 Orsay, France
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16
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Block M, Ackermann D, Blaum K, Droese C, Dworschak M, Eliseev S, Fleckenstein T, Haettner E, Herfurth F, Hessberger FP, Hofmann S, Ketelaer J, Ketter J, Kluge HJ, Marx G, Mazzocco M, Novikov YN, Plass WR, Popeko A, Rahaman S, Rodríguez D, Scheidenberger C, Schweikhard L, Thirolf PG, Vorobyev GK, Weber C. Direct mass measurements above uranium bridge the gap to the island of stability. Nature 2010; 463:785-8. [DOI: 10.1038/nature08774] [Citation(s) in RCA: 162] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Accepted: 12/17/2009] [Indexed: 11/09/2022]
Affiliation(s)
- M Block
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291 Darmstadt, Germany.
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17
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Neidherr D, Audi G, Beck D, Blaum K, Böhm C, Breitenfeldt M, Cakirli RB, Casten RF, George S, Herfurth F, Herlert A, Kellerbauer A, Kowalska M, Lunney D, Minaya-Ramirez E, Naimi S, Noah E, Penescu L, Rosenbusch M, Schwarz S, Schweikhard L, Stora T. Discovery of 229Rn and the structure of the heaviest Rn and Ra isotopes from Penning-trap mass measurements. Phys Rev Lett 2009; 102:112501. [PMID: 19392194 DOI: 10.1103/physrevlett.102.112501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Indexed: 05/27/2023]
Abstract
The masses of the neutron-rich radon isotopes {223-229}Rn have been determined for the first time, using the ISOLTRAP setup at CERN ISOLDE. In addition, this experiment marks the first discovery of a new nuclide, 229Rn, by Penning-trap mass measurement. The new, high-accuracy data allow a fine examination of the mass surface, via the valence-nucleon interaction deltaV{pn}. The results reveal intriguing behavior, possibly reflecting either a N=134 subshell closure or an octupolar deformation in this region.
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Affiliation(s)
- D Neidherr
- Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany
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18
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Baruah S, Audi G, Blaum K, Dworschak M, George S, Guénaut C, Hager U, Herfurth F, Herlert A, Kellerbauer A, Kluge HJ, Lunney D, Schatz H, Schweikhard L, Yazidjian C. Mass measurements beyond the major r-process waiting point 80Zn. Phys Rev Lett 2008; 101:262501. [PMID: 19437636 DOI: 10.1103/physrevlett.101.262501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
High-precision mass measurements on neutron-rich zinc isotopes (71m,72-81)Zn have been performed with the Penning trap mass spectrometer ISOLTRAP. For the first time, the mass of 81Zn has been experimentally determined. This makes 80Zn the first of the few major waiting points along the path of the astrophysical rapid neutron-capture process where neutron-separation energy and neutron-capture Q-value are determined experimentally. The astrophysical conditions required for this waiting point and its associated abundance signatures to occur in r-process models can now be mapped precisely. The measurements also confirm the robustness of the N=50 shell closure for Z=30.
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Affiliation(s)
- S Baruah
- Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany
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19
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Geithner W, Neff T, Audi G, Blaum K, Delahaye P, Feldmeier H, George S, Guénaut C, Herfurth F, Herlert A, Kappertz S, Keim M, Kellerbauer A, Kluge HJ, Kowalska M, Lievens P, Lunney D, Marinova K, Neugart R, Schweikhard L, Wilbert S, Yazidjian C. Masses and charge radii of 17-22Ne and the two-proton-halo candidate 17Ne. Phys Rev Lett 2008; 101:252502. [PMID: 19113701 DOI: 10.1103/physrevlett.101.252502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Indexed: 05/27/2023]
Abstract
High-precision mass and charge radius measurements on ;{17-22}Ne, including the proton-halo candidate 17Ne, have been performed with Penning trap mass spectrometry and collinear laser spectroscopy. The 17Ne mass uncertainty is improved by factor 50, and the charge radii of ;{17-19}Ne are determined for the first time. The fermionic molecular dynamics model explains the pronounced changes in the ground-state structure. It attributes the large charge radius of 17Ne to an extended proton configuration with an s;{2} component of about 40%. In 18Ne the smaller radius is due to a significantly smaller s;{2} component. The radii increase again for ;{19-22}Ne due to cluster admixtures.
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Affiliation(s)
- W Geithner
- Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany
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20
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Bachelet C, Audi G, Gaulard C, Guénaut C, Herfurth F, Lunney D, de Saint Simon M, Thibault C. New binding energy for the two-neutron halo of 11Li. Phys Rev Lett 2008; 100:182501. [PMID: 18518366 DOI: 10.1103/physrevlett.100.182501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Indexed: 05/26/2023]
Abstract
The extended radius of a halo nuclide is very sensitive to the minute binding energy of its valence nucleons. The binding energy of 11Li has been measured with high precision by using the radio-frequency spectrometer MISTRAL at CERN's ISOLDE facility. The new two-neutron separation energy of 378+/-5 keV is 25% higher than the previously accepted value with an uncertainty 5 times smaller.
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Affiliation(s)
- C Bachelet
- Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), IN2P3-CNRS-Université Paris-Sud 11, 91405 Orsay, France
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21
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Dworschak M, Audi G, Blaum K, Delahaye P, George S, Hager U, Herfurth F, Herlert A, Kellerbauer A, Kluge HJ, Lunney D, Schweikhard L, Yazidjian C. Restoration of the n=82 shell gap from direct mass measurements of 132,134Sn. Phys Rev Lett 2008; 100:072501. [PMID: 18352543 DOI: 10.1103/physrevlett.100.072501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2007] [Indexed: 05/26/2023]
Abstract
A high-precision direct Penning trap mass measurement has revealed a 0.5-MeV deviation of the binding energy of (134)Sn from the currently accepted value. The corrected mass assignment of this neutron-rich nuclide restores the neutron-shell gap at N=82, previously considered to be a case of "shell quenching." In fact, the new shell gap value for the short-lived (132)Sn is larger than that of the doubly magic (48)Ca which is stable. The N=82 shell gap has considerable impact on fission recycling during the r process. More generally, the new finding has important consequences for microscopic mean-field theories which systematically deviate from the measured binding energies of closed-shell nuclides.
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Affiliation(s)
- M Dworschak
- GSI, Planckstrasse 1, 64291 Darmstadt, Germany. m.dworschak.gsi.de
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22
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Rauth C, Ackermann D, Blaum K, Block M, Chaudhuri A, Di Z, Eliseev S, Ferrer R, Habs D, Herfurth F, Hessberger FP, Hofmann S, Kluge HJ, Maero G, Martín A, Marx G, Mukherjee M, Neumayr JB, Plass WR, Rahaman S, Rodríguez D, Scheidenberger C, Schweikhard L, Thirolf PG, Vorobjev G, Weber C. First Penning trap mass measurements beyond the proton drip line. Phys Rev Lett 2008; 100:012501. [PMID: 18232754 DOI: 10.1103/physrevlett.100.012501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2006] [Revised: 07/19/2007] [Indexed: 05/25/2023]
Abstract
The masses of six neutron-deficient rare holmium and thulium isotopes close to the proton drip line were determined with the SHIPTRAP Penning trap mass spectrometer. For the first time the masses of the proton-unbound isotopes 144,145Ho and 147,148Tm were directly measured. The proton separation energies were derived from the measured mass values and compared to predictions from mass formulas. The new values of the proton separation energies are used to determine the location of the proton drip line for holmium and thulium more accurately.
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Affiliation(s)
- C Rauth
- Gesellschaft für Schwerionenforschung (GSI), Planckstrasse 1, 64291 Darmstadt, Germany
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23
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Kluge HJ, Beier T, Blaum K, Dahl L, Eliseev S, Herfurth F, Hofmann B, Kester O, Koszudowski S, Kozhuharov C, Maero G, Nörtershäuser W, Pfister J, Quint W, Ratzinger U, Schempp A, Schuch R, Stöhlker T, Thompson R, Vogel M, Vorobjev G, Winters D, Werth G. Chapter 7 HITRAP: A Facility at GSI for Highly Charged Ions. ADVANCES IN QUANTUM CHEMISTRY 2008. [DOI: 10.1016/s0065-3276(07)53007-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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24
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George S, Baruah S, Blank B, Blaum K, Breitenfeldt M, Hager U, Herfurth F, Herlert A, Kellerbauer A, Kluge HJ, Kretzschmar M, Lunney D, Savreux R, Schwarz S, Schweikhard L, Yazidjian C. Ramsey method of separated oscillatory fields for high-precision penning trap mass spectrometry. Phys Rev Lett 2007; 98:162501. [PMID: 17501414 DOI: 10.1103/physrevlett.98.162501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2006] [Indexed: 05/15/2023]
Abstract
Ramsey's method of separated oscillatory fields is applied to the excitation of the cyclotron motion of short-lived ions in a Penning trap to improve the precision of their measured mass values. The theoretical description of the extracted ion-cyclotron-resonance line shape is derived and its correctness demonstrated experimentally by measuring the mass of the short-lived 38Ca nuclide with an uncertainty of 1.1 x 10(-8) using the Penning trap mass spectrometer ISOLTRAP at CERN. The mass of the superallowed beta emitter 38Ca contributes for testing the theoretical corrections of the conserved-vector-current hypothesis of the electroweak interaction. It is shown that the Ramsey method applied to Penning trap mass measurements yields a statistical uncertainty similar to that obtained by the conventional technique but 10 times faster. Thus the technique is a new powerful tool for high-precision mass measurements.
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Affiliation(s)
- S George
- GSI, Planckstrasse 1, 64291 Darmstadt, Germany.
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25
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26
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Rodríguez D, Kolhinen VS, Audi G, Aystö J, Beck D, Blaum K, Bollen G, Herfurth F, Jokinen A, Kellerbauer A, Kluge HJ, Oinonen M, Schatz H, Sauvan E, Schwarz S. Mass measurement on the rp-process waiting point 72Kr. Phys Rev Lett 2004; 93:161104. [PMID: 15524973 DOI: 10.1103/physrevlett.93.161104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2004] [Indexed: 05/24/2023]
Abstract
The mass of one of the three major waiting points in the astrophysical rp process 72Kr was measured for the first time with the Penning trap mass spectrometer ISOLTRAP. The measurement yielded a relative mass uncertainty of deltam/m=1.2x10(-7) (deltam=8 keV). (73,74)Kr, also needed for astrophysical calculations, were measured with more than 1 order of magnitude improved accuracy. We use the ISOLTRAP masses of 72-74Kr to reanalyze the role of 72Kr (T(1/2)=17.2 s) in the rp process during x-ray bursts and conclude that 72Kr is a strong waiting point delaying the burst duration with at least 80% of its beta-decay half-life.
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27
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Mukherjee M, Kellerbauer A, Beck D, Blaum K, Bollen G, Carrel F, Delahaye P, Dilling J, George S, Guénaut C, Herfurth F, Herlert A, Kluge HJ, Köster U, Lunney D, Schwarz S, Schweikhard L, Yazidjian C. The mass of 22Mg. Phys Rev Lett 2004; 93:150801. [PMID: 15524861 DOI: 10.1103/physrevlett.93.150801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2004] [Indexed: 05/24/2023]
Abstract
Mass measurements with a relative precision of better than 1.5 x 10(-8) were performed on 22Mg and its reaction partners 21Na and 22Na with the ISOLTRAP Penning trap mass spectrometer at CERN, yielding the mass excesses D(22Mg)=-399.92(27) keV, D(21Na)=-2184.71(21) keV, and D(22Na)=-5181.56(16) keV. The importance of these results is twofold. First, a comparative half-life (Ft value) has been obtained for the superallowed beta decay of 22Mg to further test the conserved-vector-current hypothesis. Second, the resonance energy for the 21Na proton capture reaction has been independently determined, allowing direct comparisons of observable gamma radiation in nova explosions with the yield expected from models.
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Affiliation(s)
- M Mukherjee
- GSI, Planckstrasse 1, 64291 Darmstadt, Germany
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28
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Kellerbauer A, Audi G, Beck D, Blaum K, Bollen G, Brown BA, Delahaye P, Guénaut C, Herfurth F, Kluge HJ, Lunney D, Schwarz S, Schweikhard L, Yazidjian C. Direct mass measurements on the superallowed emitter 74Rb and its daughter 74Kr: isospin-symmetry-breaking correction for standard-model tests. Phys Rev Lett 2004; 93:072502. [PMID: 15324229 DOI: 10.1103/physrevlett.93.072502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2004] [Indexed: 05/24/2023]
Abstract
The decay energy of the superallowed beta decay 74Rb(beta+)74Kr was determined by direct Penning trap mass measurements on both the mother and the daughter nuclide using the time-of-flight resonance technique and was found to be Q=10 416.8(4.5) keV. The exotic nuclide 74Rb, with a half-life of only 65 ms, is the shortest-lived nuclide on which a high-precision mass measurement in a Penning trap has been carried out. Together with existing data for the partial half-life as well as theoretical corrections, the decay energy yields a comparative half-life of Ft=3084(15) s for this decay, in agreement with the mean value for the series of the lighter nuclides from 10C to 54Co. Assuming conserved vector current, this result allows for an experimental determination of the isospin-symmetry-breaking correction deltaC.
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Affiliation(s)
- A Kellerbauer
- Department of Physics, CERN, 1211 Genève 23, Switzerland.
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Van Roosbroeck J, Guénaut C, Audi G, Beck D, Blaum K, Bollen G, Cederkall J, Delahaye P, De Maesschalck A, De Witte H, Fedorov D, Fedoseyev VN, Franchoo S, Fynbo HOU, Górska M, Herfurth F, Heyde K, Huyse M, Kellerbauer A, Kluge HJ, Köster U, Kruglov K, Lunney D, Mishin VI, Mueller WF, Nagy S, Schwarz S, Schweikhard L, Smirnova NA, Van de Vel K, Van Duppen P, Van Dyck A, Walters WB, Weissman L, Yazidjian C. Unambiguous identification of three beta-decaying isomers in 70Cu. Phys Rev Lett 2004; 92:112501. [PMID: 15089126 DOI: 10.1103/physrevlett.92.112501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2003] [Indexed: 05/24/2023]
Abstract
Using resonant laser ionization, beta-decay studies, and for the first time mass measurements, three beta-decaying states have been unambiguously identified in 70Cu. A mass excess of -62 976.1(1.6) keV and a half-life of 44.5(2) s for the (6-) ground state have been determined. The level energies of the (3-) isomer at 101.1(3) keV with T(1/2)=33(2) s and the 1+ isomer at 242.4(3) keV with T(1/2)=6.6(2) s are confirmed by high-precision mass measurements. The low-lying levels of 70Cu populated in the decay of 70Ni and in transfer reactions compare well with large-scale shell-model calculations, and the wave functions appear to be dominated by one proton-one neutron configurations outside the closed Z=28 shell and N=40 subshell. This does not apply to the 1+ state at 1980 keV which exhibits a particular feeding and deexcitation pattern not reproduced by the shell-model calculations.
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Affiliation(s)
- J Van Roosbroeck
- IKS, University of Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
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Blaum K, Audi G, Beck D, Bollen G, Herfurth F, Kellerbauer A, Kluge HJ, Sauvan E, Schwarz S. Masses of 32Ar and 33Ar for fundamental tests. Phys Rev Lett 2003; 91:260801. [PMID: 14754034 DOI: 10.1103/physrevlett.91.260801] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2003] [Indexed: 05/24/2023]
Abstract
Masses of the short-lived radionuclides 32Ar (T(1/2)=98 ms) and 33Ar (T(1/2)=173 ms) have been determined with the Penning trap mass spectrometer ISOLTRAP. Relative uncertainties of 6.0x10(-8) (deltam=1.8 keV) and 1.4x10(-8) (deltam=0.44 keV), respectively, have been achieved. At present, these new mass data serve as the most stringent test of the quadratic form of the isobaric-multiplet mass equation. Furthermore, the improved accuracy for the mass of 32Ar will allow for a better constraint on scalar contributions to the weak interaction. New mass values have also been measured for 44Ar and 45Ar, and a 20sigma deviation for 44Ar from the literature value was found and interpreted.
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Affiliation(s)
- K Blaum
- CERN, Division EP, 1211 Geneva 23, Switzerland and GSI, Planckstrasse 1, 64291 Darmstadt, Germany.
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Herfurth F, Dilling J, Kellerbauer A, Audi G, Beck D, Bollen G, Kluge HJ, Lunney D, Moore RB, Scheidenberger C, Schwarz S, Sikler G, Szerypo J. Breakdown of the isobaric multiplet mass equation at A = 33, T = 3/2. Phys Rev Lett 2001; 87:142501. [PMID: 11580645 DOI: 10.1103/physrevlett.87.142501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2000] [Indexed: 05/23/2023]
Abstract
Mass measurements on (33,34,42,43)Ar were performed using the Penning trap mass spectrometer ISOLTRAP and a newly constructed linear Paul trap. This arrangement allowed us, for the first time, to extend Penning trap mass measurements to nuclides with half-lives below one second ( 33Ar: T(1/2) = 174 ms). A mass accuracy of about 10(-7) (deltam approximately 4 keV) was achieved for all investigated nuclides. The isobaric multiplet mass equation was checked for the A = 33, T = 3/2 quartet and found to be inconsistent with the generally accepted quadratic form.
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Affiliation(s)
- F Herfurth
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany.
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