1
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König K, Köhler F, Palmes J, Badura H, Dockery A, Minamisono K, Meisner J, Müller P, Nörtershäuser W, Passon S. High voltage determination and stabilization for collinear laser spectroscopy applications. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:083307. [PMID: 39177456 DOI: 10.1063/5.0218649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Accepted: 08/06/2024] [Indexed: 08/24/2024]
Abstract
Fast beam collinear laser spectroscopy is the established method to investigate nuclear ground state properties such as the spin, the electromagnetic moments, and the charge radius of exotic nuclei. These are extracted with high precision from atomic observables, i.e., the hyperfine splitting and the isotope shift, which become possible due to a large reduction of the Doppler broadening by compressing the velocity width of the ion beam through electrostatic acceleration. With the advancement of experimental methods and applied devices, e.g., to measure and stabilize the laser frequency, the acceleration potential became the dominant systematic uncertainty contribution. To overcome this, we present a custom-built high-voltage divider, which was developed and tested at the German metrology institute, and a feedback loop that enabled collinear laser spectroscopy to be performed at a 100-kHz level. Furthermore, we describe the impact of field penetration into the laser-ion interaction region. This affects the determined isotope shifts and hyperfine splittings if Doppler tuning is applied, i.e., the ion beam energy is altered instead of scanning the laser frequency. Using different laser frequencies that were referenced to a frequency comb, the field penetration was extracted laser spectroscopically. This allowed us to define an effective scanning potential to still apply the faster and easier Doppler tuning without introducing systematic deviations.
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Affiliation(s)
- Kristian König
- Institut für Kernphysik, Department of Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - Finn Köhler
- Institut für Kernphysik, Department of Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Julian Palmes
- Institut für Kernphysik, Department of Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Henrik Badura
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
| | - Adam Dockery
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Kei Minamisono
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Johann Meisner
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
| | - Patrick Müller
- Institut für Kernphysik, Department of Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Wilfried Nörtershäuser
- Institut für Kernphysik, Department of Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- Helmholtz Forschungsakademie Hessen für FAIR (HFHF), Campus Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
| | - Stephan Passon
- Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany
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2
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Imgram P, König K, Maaß B, Müller P, Nörtershäuser W. Collinear Laser Spectroscopy of 2 ^{3}S_{1}→2 ^{3}P_{J} Transitions in Helium-like ^{12}C^{4+}. PHYSICAL REVIEW LETTERS 2023; 131:243001. [PMID: 38181159 DOI: 10.1103/physrevlett.131.243001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 09/21/2023] [Indexed: 01/07/2024]
Abstract
Transition frequencies and fine-structure splittings of the 2 ^{3}S_{1}→2 ^{3}P_{J} transitions in helium-like ^{12}C^{4+} were measured by collinear laser spectroscopy on a 1-ppb level. Accuracy is increased by more than 3 orders of magnitude with respect to previous measurements, enabling tests of recent nonrelativistic (NR) QED calculations including terms up to mα^{7}. Deviations between the theoretical and experimental values are within theoretical uncertainties and are ascribed to mα^{8} and higher-order contributions in the series expansion of the NR QED calculations. Finally, prospects for an all-optical charge radius determination of light isotopes are evaluated.
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Affiliation(s)
- P Imgram
- Institut für Kernphysik, Departement of Physics, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - K König
- Institut für Kernphysik, Departement of Physics, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
- Helmholtz Research Academy Hesse for FAIR, Campus Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - B Maaß
- Institut für Kernphysik, Departement of Physics, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - P Müller
- Institut für Kernphysik, Departement of Physics, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - W Nörtershäuser
- Institut für Kernphysik, Departement of Physics, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
- Helmholtz Research Academy Hesse for FAIR, Campus Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
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3
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Fairbank DM, Banducci AL, Gunkelman RW, VanArsdale JB, Vildibill ML, Brewer SM. Absolute Frequency Measurements of the D Lines in ^{9}Be^{+} Using a Single Trapped Ion. PHYSICAL REVIEW LETTERS 2023; 131:093001. [PMID: 37721838 DOI: 10.1103/physrevlett.131.093001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 07/21/2023] [Indexed: 09/20/2023]
Abstract
Optical frequencies of the D line transitions in ^{9}Be^{+} were measured with a relative uncertainty of Δν/ν=5×10^{-11}. The results represent the highest accuracy achieved on a broad electric dipole-allowed (E1) transition in a trapped ion experiment to date, enabled in part by detailed consideration of photon recoil and quantum interference. Measurements were made on a single laser-cooled ion stored in a radio frequency Paul trap, using a spectroscopy laser stabilized to an optical frequency comb and referenced to UTC (NIST). The uncertainties in the D_{1} and D_{2} lines have been reduced by a factor of 10 and 30, respectively, compared to previous work. We have extracted the ^{2}P fine structure splitting, Δν_{fs}=197 064.54(7) MHz, and the ^{2}P_{1/2} hyperfine constant, A_{P_{1/2}}=-117.92(4) MHz.
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Affiliation(s)
- D M Fairbank
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - A L Banducci
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - R W Gunkelman
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - J B VanArsdale
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - M L Vildibill
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - S M Brewer
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
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4
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An Introduction to Relativistic Theory as Implemented in GRASP. ATOMS 2022. [DOI: 10.3390/atoms11010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Computational atomic physics continues to play a crucial role in both increasing the understanding of fundamental physics (e.g., quantum electrodynamics and correlation) and producing atomic data for interpreting observations from large-scale research facilities ranging from fusion reactors to high-power laser systems, space-based telescopes and isotope separators. A number of different computational methods, each with their own strengths and weaknesses, is available to meet these tasks. Here, we review the relativistic multiconfiguration method as it applies to the General Relativistic Atomic Structure Package [grasp2018, C. Froese Fischer, G. Gaigalas, P. Jönsson, J. Bieroń, Comput. Phys. Commun. (2018). DOI: 10.1016/j.cpc.2018.10.032]. To illustrate the capacity of the package, examples of calculations of relevance for nuclear physics and astrophysics are presented.
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5
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König K, Krämer J, Geppert C, Imgram P, Maaß B, Ratajczyk T, Nörtershäuser W. A new Collinear Apparatus for Laser Spectroscopy and Applied Science (COALA). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:081301. [PMID: 32872936 DOI: 10.1063/5.0010903] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 06/15/2020] [Indexed: 06/11/2023]
Abstract
We present a new collinear laser spectroscopy setup that has been designed to overcome systematic uncertainty limits arising from high-voltage and frequency measurements, beam superposition, and collisions with residual gas that are present in other installations utilizing this technique. The applied methods and experimental realizations are described, including an active stabilization of the ion-source potential, new types of ion sources that have not been used for collinear laser spectroscopy so far, dedicated installations for pump-and-probe measurements, and a versatile laser system referenced to a frequency comb. The advanced setup enables us to routinely determine transition frequencies, which was so far demonstrated only for a few cases and with lower accuracy at other facilities. It has also been designed to perform accurate high-voltage measurements for metrological applications. Demonstration and performance measurements were carried out with Ca+ and In+ ions.
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Affiliation(s)
- K König
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - J Krämer
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - C Geppert
- Forschungsreaktor TRIGA Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - P Imgram
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - B Maaß
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - T Ratajczyk
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - W Nörtershäuser
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
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6
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Maaß B, Hüther T, König K, Krämer J, Krause J, Lovato A, Müller P, Pachucki K, Puchalski M, Roth R, Sánchez R, Sommer F, Wiringa RB, Nörtershäuser W. Nuclear Charge Radii of ^{10,11}B. PHYSICAL REVIEW LETTERS 2019; 122:182501. [PMID: 31144867 DOI: 10.1103/physrevlett.122.182501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Indexed: 06/09/2023]
Abstract
The first laser spectroscopic determination of the change in the nuclear charge radius for a five-electron system is reported. This is achieved by combining high-accuracy ab initio mass-shift calculations and a high-accuracy measurement of the isotope shift in the 2s^{2}2p ^{2}P_{1/2}→2s^{2}3s ^{2}S_{1/2} ground state transition in boron atoms. Accuracy is increased by orders of magnitude for the stable isotopes ^{10,11}B and the results are used to extract their difference in the mean-square charge radius ⟨r_{c}^{2}⟩^{11}-⟨r_{c}^{2}⟩^{10}=-0.49(12) fm^{2}. The result is qualitatively explained by a possible cluster structure of the boron nuclei and quantitatively used to benchmark new ab initio nuclear structure calculations using the no-core shell model and Green's function Monte Carlo approaches. These results are the foundation for a laser spectroscopic determination of the charge radius of the proton-halo candidate ^{8}B.
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Affiliation(s)
- Bernhard Maaß
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - Thomas Hüther
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - Kristian König
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - Jörg Krämer
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - Jan Krause
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - Alessandro Lovato
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- INFN-TIFPA Trento Institute of Fundamental Physics and Applications, Via Sommarive 14, 38123 Trento, Italy
| | - Peter Müller
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Krzysztof Pachucki
- Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - Mariusz Puchalski
- Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland
| | - Robert Roth
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - Rodolfo Sánchez
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - Felix Sommer
- Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
| | - R B Wiringa
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
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7
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Barranco F, Potel G, Broglia RA, Vigezzi E. Structure and Reactions of ^{11}Be: Many-Body Basis for Single-Neutron Halo. PHYSICAL REVIEW LETTERS 2017; 119:082501. [PMID: 28952765 DOI: 10.1103/physrevlett.119.082501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Indexed: 06/07/2023]
Abstract
The exotic nucleus ^{11}Be has been extensively studied and much experimental information is available on the structure of this system. We treat, within the framework of renormalized nuclear field theory in both configuration and 3D space, the mixing of bound and continuum single-particle states through the coupling to collective vibrations of the ^{10}Be core. We also take care of the Pauli principle acting not only between the single valence particle explicitly considered and those participating in the collective states, but also between fermions involved in two-phonon virtual states dressing the single-particle motion. In this way, it is possible to simultaneously and quantitatively account for the energies of the 1/2^{+}, 1/2^{-} low-lying states, the centroid and line shape of the 5/2^{+} resonance and the one-nucleon stripping and pickup absolute differential cross sections involving ^{11}Be as either target or residual nucleus. Also for the dipole transition connecting the 1/2^{+} and 1/2^{-} parity inverted levels as well as the isotopic shift of the charge radius. Theory provides a unified and exhaustive nuclear structure and reaction characterization of the many-body effects which are at the basis of this paradigmatic one-neutron halo system.
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Affiliation(s)
- F Barranco
- Departamento de Fìsica Aplicada III, Escuela Superior de Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos, 41092 Sevilla, Spain
| | - G Potel
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R A Broglia
- The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
- Dipartimento di Fisica, Università degli Studi Milano, Via Celoria 16, I-20133 Milano, Italy
| | - E Vigezzi
- INFN Sezione di Milano, Via Celoria 16, I-20133 Milano, Italy
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8
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Kanungo R, Horiuchi W, Hagen G, Jansen GR, Navratil P, Ameil F, Atkinson J, Ayyad Y, Cortina-Gil D, Dillmann I, Estradé A, Evdokimov A, Farinon F, Geissel H, Guastalla G, Janik R, Kimura M, Knöbel R, Kurcewicz J, Litvinov YA, Marta M, Mostazo M, Mukha I, Nociforo C, Ong HJ, Pietri S, Prochazka A, Scheidenberger C, Sitar B, Strmen P, Suzuki Y, Takechi M, Tanaka J, Tanihata I, Terashima S, Vargas J, Weick H, Winfield JS. Proton Distribution Radii of ^{12-19}C Illuminate Features of Neutron Halos. PHYSICAL REVIEW LETTERS 2016; 117:102501. [PMID: 27636470 DOI: 10.1103/physrevlett.117.102501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Indexed: 06/06/2023]
Abstract
Proton radii of ^{12-19}C densities derived from first accurate charge changing cross section measurements at 900A MeV with a carbon target are reported. A thick neutron surface evolves from ∼0.5 fm in ^{15}C to ∼1 fm in ^{19}C. The halo radius in ^{19}C is found to be 6.4±0.7 fm as large as ^{11}Li. Ab initio calculations based on chiral nucleon-nucleon and three-nucleon forces reproduce the radii well.
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Affiliation(s)
- R Kanungo
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
| | - W Horiuchi
- Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
| | - G Hagen
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - G R Jansen
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- National Center for Computational Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 USA
| | - P Navratil
- TRIUMF, Vancouver, British Columbia V6T 4A3, Canada
| | - F Ameil
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J Atkinson
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
| | - Y Ayyad
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - D Cortina-Gil
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - I Dillmann
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - A Estradé
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - A Evdokimov
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - F Farinon
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - H Geissel
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
- Justus-Liebig University, 35392 Giessen, Germany
| | - G Guastalla
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - R Janik
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
| | - M Kimura
- Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
| | - R Knöbel
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J Kurcewicz
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - Yu A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - M Marta
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - M Mostazo
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - I Mukha
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - C Nociforo
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - H J Ong
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
| | - S Pietri
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - A Prochazka
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - C Scheidenberger
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
- Justus-Liebig University, 35392 Giessen, Germany
| | - B Sitar
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
| | - P Strmen
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
| | - Y Suzuki
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Department of Physics, Niigata University, Niigata 950-2181, Japan
| | - M Takechi
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J Tanaka
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
| | - I Tanihata
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
- School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, People's Republic of China
| | - S Terashima
- School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, People's Republic of China
| | - J Vargas
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - H Weick
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J S Winfield
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
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9
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Yordanov DT, Balabanski DL, Bissell ML, Blaum K, Budinčević I, Cheal B, Flanagan K, Frömmgen N, Georgiev G, Geppert C, Hammen M, Kowalska M, Kreim K, Krieger A, Meng J, Neugart R, Neyens G, Nörtershäuser W, Rajabali MM, Papuga J, Schmidt S, Zhao PW. Simple Nuclear Structure in (111-129)Cd from Atomic Isomer Shifts. PHYSICAL REVIEW LETTERS 2016; 116:032501. [PMID: 26849588 DOI: 10.1103/physrevlett.116.032501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Indexed: 06/05/2023]
Abstract
Isomer shifts have been determined in ^{111-129}Cd by high-resolution laser spectroscopy at CERN-ISOLDE. The corresponding mean square charge-radii changes, from the 1/2^{+} and the 3/2^{+} ground states to the 11/2^{-} isomers, have been found to follow a distinct parabolic dependence as a function of the atomic mass number. Since the isomers have been previously associated with simplicity due to the linear mass dependence of their quadrupole moments, the regularity of the isomer shifts suggests a higher order of symmetry affecting the ground states in addition. A comprehensive description assuming nuclear deformation is found to accurately reproduce the radii differences in conjunction with the known quadrupole moments. This intuitive interpretation is supported by covariant density functional theory.
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Affiliation(s)
- D T Yordanov
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay, France
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- CERN European Organization for Nuclear Research, Physics Department, 1211 Geneva 23, Switzerland
| | - D L Balabanski
- ELI-NP, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 077125 Magurele, Romania
| | - M L Bissell
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - I Budinčević
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - B Cheal
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - K Flanagan
- School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - N Frömmgen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - G Georgiev
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
| | - Ch Geppert
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - M Hammen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - M Kowalska
- CERN European Organization for Nuclear Research, Physics Department, 1211 Geneva 23, Switzerland
| | - K Kreim
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - A Krieger
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - J Meng
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - R Neugart
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - G Neyens
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - W Nörtershäuser
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
- Institut fur Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - M M Rajabali
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - J Papuga
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - S Schmidt
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - P W Zhao
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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10
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Odsuren M, Kikuchi Y, Myo T, Aikawa M, Katō K. Photodisintegration of 9Be and the importance of the unbound 1/2 +state. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201610905007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Tran D, Nguyen T, Tanihata I, Ong H, Fukuda M, Aoi N, Ayyad Y, Sakaguchi H, Tanaka J, Chan P, Hoang T, Hashimoto T, Ideguchi E, Inoue A, Kawabata T, Khiem L, Matsuta K, Mihara M, Momota S, Nagae D, Ozawa A, Ren P, Terashima S, Wada R, Lin W, Yamamoto T. Charge-changing cross section measurement of neutron-rich carbon isotopes at 50 AMeV. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611707023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Nörtershäuser W, Geppert C, Krieger A, Pachucki K, Puchalski M, Blaum K, Bissell ML, Frömmgen N, Hammen M, Kowalska M, Krämer J, Kreim K, Neugart R, Neyens G, Sánchez R, Yordanov DT. Precision Test of Many-Body QED in the Be+ 2p Fine Structure Doublet Using Short-Lived Isotopes. PHYSICAL REVIEW LETTERS 2015; 115:033002. [PMID: 26230786 DOI: 10.1103/physrevlett.115.033002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Indexed: 06/04/2023]
Abstract
Absolute transition frequencies of the 2s 2S{1/2}→2p2P{1/2,3/2} transitions in Be^{+} were measured for the isotopes ^{7,9-12}Be. The fine structure splitting of the 2p state and its isotope dependence are extracted and compared to results of ab initio calculations using explicitly correlated basis functions, including relativistic and quantum electrodynamics effects at the order of mα(6) and mα(7) ln α. Accuracy has been improved in both the theory and experiment by 2 orders of magnitude, and good agreement is observed. This represents one of the most accurate tests of quantum electrodynamics for many-electron systems, being insensitive to nuclear uncertainties.
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Affiliation(s)
| | - Christopher Geppert
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
| | - Andreas Krieger
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
| | - Krzysztof Pachucki
- Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - Mariusz Puchalski
- Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
- Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614 Poznań, Poland
| | - Klaus Blaum
- Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
| | - Mark L Bissell
- Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium
| | - Nadja Frömmgen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
| | - Michael Hammen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
| | | | - Jörg Krämer
- Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - Kim Kreim
- Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
| | - Rainer Neugart
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
| | - Gerda Neyens
- Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium
| | - Rodolfo Sánchez
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
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13
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Estradé A, Kanungo R, Horiuchi W, Ameil F, Atkinson J, Ayyad Y, Cortina-Gil D, Dillmann I, Evdokimov A, Farinon F, Geissel H, Guastalla G, Janik R, Kimura M, Knöbel R, Kurcewicz J, Litvinov YA, Marta M, Mostazo M, Mukha I, Nociforo C, Ong HJ, Pietri S, Prochazka A, Scheidenberger C, Sitar B, Strmen P, Suzuki Y, Takechi M, Tanaka J, Tanihata I, Terashima S, Vargas J, Weick H, Winfield JS. Proton radii of (12-17)B define a thick neutron surface in ¹⁷B. PHYSICAL REVIEW LETTERS 2014; 113:132501. [PMID: 25302882 DOI: 10.1103/physrevlett.113.132501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Indexed: 06/04/2023]
Abstract
The first determination of radii of point proton distribution (proton radii) of (12-17)B from charge-changing cross sections (σ(CC)) measurements at the FRS, GSI, Darmstadt is reported. The proton radii are deduced from a finite-range Glauber model analysis of the σ(CC). The radii show an increase from ¹³B to ¹⁷B and are consistent with predictions from the antisymmetrized molecular dynamics model for the neutron-rich nuclei. The measurements show the existence of a thick neutron surface with neutron-proton radius difference of 0.51(0.11) fm in ¹⁷B.
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Affiliation(s)
- A Estradé
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3 H 3C3, Canada and GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - R Kanungo
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3 H 3C3, Canada
| | - W Horiuchi
- Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
| | - F Ameil
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J Atkinson
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3 H 3C3, Canada
| | - Y Ayyad
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - D Cortina-Gil
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - I Dillmann
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - A Evdokimov
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - F Farinon
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - H Geissel
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany and Justus-Liebig University, 35392 Giessen, Germany
| | - G Guastalla
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - R Janik
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
| | - M Kimura
- Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
| | - R Knöbel
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J Kurcewicz
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - Yu A Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - M Marta
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - M Mostazo
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - I Mukha
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - C Nociforo
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - H J Ong
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
| | - S Pietri
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - A Prochazka
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - C Scheidenberger
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany and Justus-Liebig University, 35392 Giessen, Germany
| | - B Sitar
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
| | - P Strmen
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
| | - Y Suzuki
- Department of Physics, Niigata University, Niigata 950-2181, Japan and RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
| | - M Takechi
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J Tanaka
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
| | - I Tanihata
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan and School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, People's Republic of China
| | - S Terashima
- School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, People's Republic of China
| | - J Vargas
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain
| | - H Weick
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
| | - J S Winfield
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
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14
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Takamine A, Wada M, Okada K, Sonoda T, Schury P, Nakamura T, Kanai Y, Kubo T, Katayama I, Ohtani S, Wollnik H, Schuessler HA. Hyperfine structure constant of the neutron halo nucleus (11)Be(+). PHYSICAL REVIEW LETTERS 2014; 112:162502. [PMID: 24815642 DOI: 10.1103/physrevlett.112.162502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Indexed: 06/03/2023]
Abstract
The hyperfine splittings of ground state Be+11 have been measured precisely by laser-microwave double resonance spectroscopy for trapped and laser cooled beryllium ions. The ions were produced at relativistic energies and subsequently slowed down and trapped at mK temperatures. The magnetic hyperfine structure constant of Be+11 was determined to be A11=-2677.302 988(72) MHz from the measurements of the mF-mF'=0-0 field independent transition. This measurement provides essential data for the study of the distribution of the halo neutron in the single neutron halo nucleus Be11 through the Bohr-Weisskopf effect.
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Affiliation(s)
- A Takamine
- Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Wada
- Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Okada
- Department of Physics, Sophia University, 7-1 Kioicho, Chiyoda, Tokyo 102-8554, Japan
| | - T Sonoda
- Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - P Schury
- Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Nakamura
- Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Kanai
- Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kubo
- Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - I Katayama
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - S Ohtani
- Institute for Laser Science (ILS), The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
| | - H Wollnik
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA
| | - H A Schuessler
- Department of Physics, Texas A&M University, College Station, Texas 77843, USA
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15
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Belyaeva TL, Perez-Torres R, Demyanova AS, Goncharov SA, Ogloblin AA. Neutron asymptotic normalization coefficients and halo radii of the first excited states of13C and11Be. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146603009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Voss A, Pearson MR, Billowes J, Buchinger F, Cheal B, Crawford JE, Kwiatkowski AA, Levy CDP, Shelbaya O. First use of high-frequency intensity modulation of narrow-linewidth laser light and its application in determination of 206,205,204Fr ground-state properties. PHYSICAL REVIEW LETTERS 2013; 111:122501. [PMID: 24093252 DOI: 10.1103/physrevlett.111.122501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2013] [Indexed: 06/02/2023]
Abstract
Collinear laser spectroscopy was performed on the nuclear ground states of the neutron-deficient isotopes (206,205,204)Fr. A new technique was developed to suppress hyperfine pumping in collinear laser spectroscopy of atoms. This involved high-frequency intensity modulation of narrow-linewidth laser light using fast-switching electro-optical modulators. The nuclear ground-state spins of (206,205,204)Fr were determined to be 3, 9/2, and 3, respectively. Both the changes in mean-squared charge radii and nuclear magnetic dipole moments indicate a departure from single-particle estimates.
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Affiliation(s)
- Annika Voss
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
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17
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Krieger A, Blaum K, Bissell ML, Frömmgen N, Geppert C, Hammen M, Kreim K, Kowalska M, Krämer J, Neff T, Neugart R, Neyens G, Nörtershäuser W, Novotny C, Sánchez R, Yordanov DT. Nuclear charge radius of 12Be. PHYSICAL REVIEW LETTERS 2012; 108:142501. [PMID: 22540787 DOI: 10.1103/physrevlett.108.142501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Indexed: 05/31/2023]
Abstract
The nuclear charge radius of (12)Be was precisely determined using the technique of collinear laser spectroscopy on the 2s(1/2)→2p(1/2,3/2) transition in the Be(+) ion. The mean square charge radius increases from (10)Be to (12)Be by δ<r(c)(2)>(10,12)=0.69(5) fm(2) compared to δ<r(c)(2)>(10,11)=0.49(5) fm(2) for the one-neutron halo isotope ^{11}Be. Calculations in the fermionic molecular dynamics approach show a strong sensitivity of the charge radius to the structure of ^{12}Be. The experimental charge radius is consistent with a breakdown of the N=8 shell closure.
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Affiliation(s)
- A Krieger
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
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18
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Baumann T, Spyrou A, Thoennessen M. Nuclear structure experiments along the neutron drip line. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2012; 75:036301. [PMID: 22790419 DOI: 10.1088/0034-4885/75/3/036301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Invariant mass measurements and breakup reactions of neutron-rich nuclei have been instrumental in the study of nuclear structure effects at the limit of nuclear existence. The measurements of neutron-unbound states rely on the detection of neutrons in coincidence with fragments at energies between 100 and 1000 MeV/u. Charged particle and γ-ray coincidence measurements yield additional information. The production and detection methods for these experiments and examples of results in light nuclei are presented. Future opportunities with new facilities and the development of new detectors are described.
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Affiliation(s)
- T Baumann
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824-1321, USA.
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19
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Yerokhin VA, Pachucki K, Harman Z, Keitel CH. QED theory of the nuclear magnetic shielding in hydrogenlike ions. PHYSICAL REVIEW LETTERS 2011; 107:043004. [PMID: 21867000 DOI: 10.1103/physrevlett.107.043004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Indexed: 05/31/2023]
Abstract
The shielding of the nuclear magnetic moment by the bound electron in hydrogenlike ions is calculated ab initio with inclusion of relativistic, nuclear, and quantum electrodynamics (QED) effects. The QED correction is evaluated to all orders in the nuclear binding strength parameter and, independently, to the first order in the expansion in this parameter. The results obtained lay the basis for the high-precision determination of nuclear magnetic dipole moments from measurements of the g factor of hydrogenlike ions.
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Affiliation(s)
- V A Yerokhin
- Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, D 69117 Heidelberg, Germany
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20
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Yamaguchi T, Hachiuma I, Kitagawa A, Namihira K, Sato S, Suzuki T, Tanihata I, Fukuda M. Scaling of charge-changing interaction cross sections and point-proton radii of neutron-rich carbon isotopes. PHYSICAL REVIEW LETTERS 2011; 107:032502. [PMID: 21838353 DOI: 10.1103/physrevlett.107.032502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Indexed: 05/31/2023]
Abstract
Charge-changing cross sections σ(cc) of stable and unstable nuclei ((9-11)Be, (14-16)C, and (16-18)O) on a carbon target were investigated at 300 MeV/nucleon. A phenomenological analysis based on the Glauber theory indicates an approximate, but universal, scaling of σ(cc) over a wide range of A/Z. This allows the determination of the density distributions of protons tightly bound in the nuclei. An application to (16)C, which is considered to be an anomalously deformed nucleus, indicates a systematic evolution of proton root-mean-square radii and has revealed for the first time a neutron skin effect in carbon isotopes. Being complementary to isotope-shift and electron-scattering experiments, the present method can open up a new approach to explore the structure of exotic nuclei.
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Affiliation(s)
- T Yamaguchi
- Department of Physics, Saitama University, Saitama 338-8570, Japan.
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21
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Pachucki K. Nuclear structure corrections in muonic deuterium. PHYSICAL REVIEW LETTERS 2011; 106:193007. [PMID: 21668153 DOI: 10.1103/physrevlett.106.193007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Indexed: 05/30/2023]
Abstract
The muonic hydrogen experiment measuring the 2P-2S transition energy [R. Pohl et al., Nature (London) 466, 213 (2010)] is significantly discrepant with theoretical predictions based on quantum electrodynamics. A possible approach to resolve this conundrum is to compare experimental values with theoretical predictions in another system, muonic deuterium μD. The only correction which might be questioned in μD is that due to the deuteron polarizability. We investigate this effect in detail and observe cancellation with the elastic contribution. The total value obtained for the deuteron structure correction in the 2P-2S transition is 1.680(16) meV.
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Affiliation(s)
- Krzysztof Pachucki
- Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
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22
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Neff T. Microscopic calculation of the 3He(α,γ)7Be and 3H(α,γ)7Li capture cross sections using realistic interactions. PHYSICAL REVIEW LETTERS 2011; 106:042502. [PMID: 21405326 DOI: 10.1103/physrevlett.106.042502] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Indexed: 05/30/2023]
Abstract
The radiative capture cross sections for the 3He(α,γ)7Be and 3H(α,γ)7Li reactions are calculated in the fully microscopic fermionic molecular dynamics approach using a realistic effective interaction that reproduces the nucleon-nucleon scattering data. At large distances bound and scattering states are described by antisymmetrized products of 4He and 3He/3H ground states. At short distances the many-body Hilbert space is extended with additional many-body wave functions needed to represent polarized clusters and shell-model-like configurations. Properties of the bound states are described well, as are the scattering phase shifts. The calculated S factor for the 3He(α,γ)7Be reaction agrees very well with recent experimental data in both absolute normalization and energy dependence. In the case of the 3H(α,γ)7Li reaction the calculated S factor is larger than available experimental data by about 15%.
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Affiliation(s)
- Thomas Neff
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany.
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23
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24
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McCutchan EA, Lister CJ, Wiringa RB, Pieper SC, Seweryniak D, Greene JP, Carpenter MP, Chiara CJ, Janssens RVF, Khoo TL, Lauritsen T, Stefanescu I, Zhu S. Precise electromagnetic tests of ab initio calculations of light nuclei: states in 10Be. PHYSICAL REVIEW LETTERS 2009; 103:192501. [PMID: 20365919 DOI: 10.1103/physrevlett.103.192501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2009] [Revised: 10/07/2009] [Indexed: 05/29/2023]
Abstract
In order to test ab initio calculations of light nuclei, we have remeasured lifetimes in 10Be using the Doppler shift attenuation method (DSAM) following the 7Li(7Li,alpha)10Be reaction at 8 and 10 MeV. The new experiments significantly reduce systematic uncertainties in the DSAM technique. The J(pi) = 2(1)(+) state at 3.37 MeV has tau = 205 +/- (5)(stat) +/- (7)(sys) fs corresponding to a B(E2 down) of 9.2(3)e(2) fm(4) in broad agreement with many calculations. The J(pi) = 2(2)(+) state at 5.96 MeV was found to have a B(E2 down) of 0.11(2)e(2) fm(4) and provides a more discriminating test of nuclear models. New Green's function Monte Carlo calculations for these states and transitions with a number of Hamiltonians are also reported and compared to experiment.
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Affiliation(s)
- E A McCutchan
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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