C. Dimopoulou
GSI Helmholtz Centre for Heavy Ion Research
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Publication
Featured researches published by C. Dimopoulou.
Physics Letters B | 2008
Yu. A. Litvinov; F. Bosch; N. Winckler; D. Boutin; H. G. Essel; T. Faestermann; H. Geissel; Sebastian Hess; P. Kienle; R. Knöbel; C. Kozhuharov; J. Kurcewicz; L. Maier; K. Beckert; P. Beller; C. Brandau; L. Chen; C. Dimopoulou; B. Fabian; A. Fragner; E. Haettner; M. Hausmann; S. Litvinov; M. Mazzocco; F. Montes; A. Musumarra; C. Nociforo; F. Nolden; W.R. Plaß; A. Prochazka
Abstract We report on time-modulated two-body weak decays observed in the orbital electron capture of hydrogen-like 140 Pr 59+ and 142 Pm 60+ ions coasting in an ion storage ring. Using non-destructive single ion, time-resolved Schottky mass spectrometry we found that the expected exponential decay is modulated in time with a modulation period of about 7 seconds for both systems. Tentatively this observation is attributed to the coherent superposition of finite mass eigenstates of the electron neutrinos from the weak decay into a two-body final state.
Physical Review Letters | 2007
Yu. A. Litvinov; F. Bosch; H. Geissel; J. Kurcewicz; Z. Patyk; N. Winckler; L. Batist; K. Beckert; D. Boutin; C. Brandau; Lie-Wen Chen; C. Dimopoulou; B. Fabian; T. Faestermann; A. Fragner; L. V. Grigorenko; E. Haettner; Sebastian Hess; P. Kienle; R. Knöbel; C. Kozhuharov; S. Litvinov; L. Maier; M. Mazzocco; F. Montes; G. Münzenberg; A. Musumarra; C. Nociforo; F. Nolden; M. Pfützner
We report on the first measurement of the beta+ and orbital electron-capture decay rates of 140Pr nuclei with the simplest electron configurations: bare nuclei, hydrogenlike, and heliumlike ions. The measured electron-capture decay constant of hydrogenlike 140Pr58+ ions is about 50% larger than that of heliumlike 140Pr57+ ions. Moreover, 140Pr ions with one bound electron decay faster than neutral 140Pr0+ atoms with 59 electrons. To explain this peculiar observation one has to take into account the conservation of the total angular momentum, since only particular spin orientations of the nucleus and of the captured electron can contribute to the allowed decay.
Physical Review C | 2013
Daria Shubina; Burcu R. Cakirli; Yuri A. Litvinov; Klaus Blaum; C. Brandau; F. Bosch; J.J. Carroll; R. F. Casten; D. M. Cullen; I. J. Cullen; A. Y. Deo; B. Detwiler; C. Dimopoulou; F. Farinon; H. Geissel; E. Haettner; M. Heil; R.S. Kempley; C. Kozhuharov; R. Knöbel; J. Kurcewicz; N. Kuzminchuk; S. Litvinov; Z. Liu; R. S. Mao; C. Nociforo; F. Nolden; Z. Patyk; W. R. Plass; A. Prochazka
D. Shubina, 2, 3 R.B. Cakirli, 4 Yu.A. Litvinov, 3 K. Blaum, C. Brandau, 5 F. Bosch, J.J. Carroll, R.F. Casten, D.M. Cullen, I.J. Cullen, A.Y. Deo, B. Detwiler, C. Dimopoulou, F. Farinon, H. Geissel, 11 E. Haettner, M. Heil, R.S. Kempley, C. Kozhuharov, R. Knobel, J. Kurcewicz, N. Kuzminchuk, S.A. Litvinov, Z. Liu, R. Mao, C. Nociforo, F. Nolden, Z. Patyk, W.R. Plass, A. Prochazka, M.W. Reed, 15 M.S. Sanjari, 16 C. Scheidenberger, 11 M. Steck, Th. Stohlker, 17, 18 B. Sun, 19 T.P.D. Swan, G. Trees, P.M. Walker, 20 H. Weick, N. Winckler, 3 M. Winkler, P.J. Woods, T. Yamaguchi, and C. Zhou Max-Planck-Institut fur Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany Fakultat fur Physik und Astronomie, Universitat Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany GSI Helmholtzzentrum fur Schwerionenforschung, Planckstrase 1, 64291 Darmstadt, Germany Department of Physics, University of Istanbul, Istanbul, Turkey ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum fur Schwerionenforschung, 64291 Darmstadt, Germany US Army Research Laboratory, 2800 Powder Mill Road, Adelphi MD, USA Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom Youngstown State University, One University Plaza, Youngstown, Ohio 44555, USA II Physikalisches Institut, Justus-Liebig-Universitat Giesen, 35392 Giesen, Germany School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China National Centre for Nuclear Research, PL-00681 Warsaw, Poland Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra ACT 0200, Australia Goethe-Universitat Frankfurt, 60438 Frankfurt, Germany Friedrich-Schiller-Universitat Jena, 07737 Jena, Germany Helmholtz-Institut Jena, 07743 Jena, Germany School of Physics and Nuclear Energy Engineering, Beihang University, 100191 Beijing, PRC CERN, CH-1211 Geneva 23, Switzerland Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan Storage-ring mass spectrometry was applied to neutron-rich Au projectile fragments. Masses of Lu, Hf, Ta, W, and Re nuclei were measured for the first time. The uncertainty of previously known masses of W and Os nuclei was improved. Observed irregularities on the smooth two-neutron separation energies for Hf and W isotopes are linked to the collectivity phenomena in the corresponding nuclei.
Physica Scripta | 2013
C. Brandau; C. Kozhuharov; A. Müller; D. Bernhardt; D. Banas; F. Bosch; F J Currell; C. Dimopoulou; A. Gumberidze; S. Hagmann; P.-M. Hillenbrand; M. Heil; M. Lestinsky; Yuri A. Litvinov; R Märtin; F. Nolden; R. Reuschl; Shahab Sanjari; S. Schippers; D. Schneider; Daria Shubina; Haik Simon; U. Spillmann; Z. Stachura; M. Steck; Th. Stöhlker; G. Weber; M. Wiedeking; N. Winckler; D. Winters
The utilization of the resonant atomic electron–ion collision process of dielectronic recombination (DR) as a tool to probe nuclear properties via isotope shifts and hyperfine effects is discussed. Based on DR, this resonance reaction spectroscopy at electron coolers of heavy-ion storage rings denotes a versatile approach to access nuclear parameters such as charge radius, spin, magnetic moment or lifetimes of long-lived excited nuclear states (isomers). The high sensitivity of DR allows for experiments with artificially synthesized rare isotopes and isomers. Recent experimental progress in the preparation of such exotic species at the ESR storage ring in Darmstadt is presented. The DR technique is exemplified for the case of 234Pa88+ (Z = 91).
Journal of Physics: Conference Series | 2009
C. Brandau; C. Kozhuharov; A. Müller; D. Bernhardt; S. Böhm; F. Bosch; D. Boutin; Frederick Currell; C. Dimopoulou; B. Franzke; A. Gumberidze; Zoltan Harman; U. D. Jentschura; Christoph H. Keitel; H.-J. Kluge; Y. S. Kozhedub; R. Krücken; Yu. A. Litvinov; F. Nolden; B O'Rourke; R. Reuschl; S. Schippers; V. M. Shabaev; U. Spillmann; Z. Stachura; M. Steck; Th. Stöhlker; I. I. Tupitsyn; D. Winters; A. Wolf
The study of isotope shifts and hyperfine effects in dielectronic recombination (DR) resonance spectra strikes a conceptually new path for investigations of nuclear properties such as charge radius, spin, magnetic moment of nuclei or lifetimes of long-lived excited nuclear states. A series of DR experiments with heavy three-electron ions (Li-like) was performed at the heavy-ion storage ring ESR of the GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt, Germany. In a pilot experiment the two stable isotopes A=142 and A=150 of neodymium ANd57+ were investigated. From the displacement of DR resonances the isotope shifts δE142,150(2s – 2Pl/2) = 40.2(3)(6) meV and δE142,150(2s – 2p3/2) = 42.3(12)(20) meV for 2s – 2Pj transitions of the Li-like ions have been obtained. An evaluation within a full QED framework yielded a change in the mean-square charge radius of 142,150δ(r2) = −1.36(1)(3) fm2. At GSI, in addition to stable isotopes, in-flight synthesized radioisotopes can be studied as well. The production of radioisotopes of interest, the subsequent separation in the storage ring ESR and first DR experiments with the exotic nuclei 237U89+ and 234Pa88+ (Z=91) are presented. The paper is concluded with a brief outlook at future DR experiments with heavy radioisotopes at the ESR.
Physical Review C | 2015
B. Mei; T. Aumann; S. Bishop; Klaus Blaum; K. Boretzky; F. Bosch; C. Brandau; H. Bräuning; T. Davinson; I. Dillmann; C. Dimopoulou; O. Ershova; Zs. Fülöp; H. Geissel; J. Glorius; G. Gyürky; M. Heil; F. Käppeler; A. Kelic-Heil; C. Kozhuharov; C. Langer; T. Le Bleis; Y. Litvinov; G. Lotay; J. Marganiec; G. Münzenberg; F. Nolden; N. Petridis; R. Plag; U. Popp
This work presents a direct measurement of the
International Journal of Modern Physics E-nuclear Physics | 2009
B. Sun; R. Knöbel; Yu. A. Litvinov; S. Nakajima; H. Geissel; J. Meng; K. Beckert; F. Bosch; D. Boutin; C. Brandau; L. Chen; I. J. Cullen; C. Dimopoulou; B. Fabian; M. Hausmann; O. Klepper; C. Kozhuharov; J. Kurcewicz; S. A. Litvinov; M. Mazzocco; F. Montes; G. Münzenberg; A. Musumarra; C. Nociforo; F. Nolden; T. Ohtsubo; A. Ozawa; Z. Patyk; W.R. Plaß; C. Scheidenberger
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Physica Scripta | 2013
T. Stöhlker; Yuri A. Litvinov; Vincent Bagnoud; U. Bechstedt; C. Dimopoulou; Alexei Dolinskii; Christopher Geppert; S. Hagmann; Takeshi Katayama; T. Kuhl; R. Maier; W. Nörtershäuser; D. Prasuhn; R. Schuch; Markus Steck; H. Stockhorst
Ru(
Physica Scripta | 2013
F. Bosch; Dinko Atanasov; C. Brandau; I. Dillmann; C. Dimopoulou; T. Faestermann; H. Geissel; S. Hagmann; P.-M. Hillenbrand; P. Kienle; R. Knöbel; C. Kozhuharov; J. Kurcewicz; M. Lestinsky; S. Litvinov; Yu. A. Litvinov; Xinwen Ma; F. Nolden; T. Ohtsubo; Z. Patyk; R. Reuschl; Sanjari; C. Scheidenberger; Daria Shubina; U. Spillmann; M. Steck; Th. Stöhlker; B. Sun; M. Trassinelli; S. Trotsenko
p, \gamma
Journal of Physics: Conference Series 381 (2012) 012060 - Rutherford Centennial Conference on Nuclear Physics, 8–12 August 2011, Manchester, UK | 2012
M.W. Reed; P. M. Walker; I. J. Cullen; Yuri A. Litvinov; Klaus Blaum; F. Bosch; C´. Brandau; J.J. Carroll; D. M. Cullen; A. Y. Deo; B. Detwiler; C. Dimopoulou; G.D. Dracoulis; F. Farinon; H. Geissel; E. Haettner; M. Heil; R.S. Kempley; R. Knöbel; C. Kozhuharov; J. Kurcewicz; N. Kuzminchuk; S. Litvinov; Z. Liu; R. S. Mao; C. Nociforo; F. Nolden; W.R. Plaß; A. Prochazka; C. Scheidenberger
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