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1. Properties of γ -decaying isomers in the Sn100 region populated in fragmentation of a Xe124 beam

Author

V. Werner, Torbjörn Bäck, Toshiyuki Sumikama, H. Grawe, K. Moschner, N. Warr, N. Kurz, T. Isobe, Giuseppe Lorusso, M. Górska, M. Dewald, P. J. Davies, F. Ameil, P. Doornenbal, A. Gengelbach, J. Gerl, Hyo Soon Jung, Shin-Ichiro Nishimura, H. Baba, F. Naqvi, E. Gregor, K. Steiger, P. A. Söderström, M. Lewitowicz, Daiki Nishimura, T. Faestermann, D. G. Jenkins, Jan Taprogge, Zhengyu Xu, H. Hotaka, P. Thöle, P. Boutachkov, Ayumi Yagi, H. Watanbe, R. Wadsworth, H. Schaffner, A. Blazhev, G. Häfner, R. Lozeva, Norbert Pietralla, J. Jolie, K. Yoshinaga, I. Kojouharov, E. Merchan, Hiroki Nishibata, Roman Gernhäuser, Shintaro Go, and Y. Zhu

Subjects
Physics, Microsecond, Ion beam, Fragmentation (mass spectrometry), 010308 nuclear & particles physics, 0103 physical sciences, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

A systematic study was performed of microsecond γ-decaying isomers around Sn100 produced in a fragmentation reaction of a Xe124 beam at 345 MeV/u at the Radioactive Ion Beam Factory of the RIKEN Nishina Center in Saitama, Japan. Half-lives of isomeric states in that region were remeasured allowing us to improve the currently available experimental information. Reduced transition probabilities were deduced and compared to shell-model calculations in various model spaces. The recently reported low-energy transitions in Rh92 and Ag96 were remeasured with improved precision. Additionally, experimental information on isomeric ratios, including five new ones, were extracted and compared to a previous experimental study and the sharp cutoff model of fragmentation reaction.

Published
2019
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2. Properties of $\gamma $-decaying Isomers in the $^{100}$Sn Region Revisited

Author

Giuseppe Lorusso, M. Dewald, Hiroki Nishibata, H. Baba, E. Gregor, Shin-Ichiro Nishimura, A. Gengelbach, P. Thöle, H. Schaffner, V. Werner, T. Isobe, A. Blazhev, J. Gerl, F. Naqvi, P. J. Davies, Shintaro Go, Y. Zhu, Ayumi Yagi, K. Moschner, Toshiyuki Sumikama, Torbjörn Bäck, J. Jolie, T. Faestermann, D. G. Jenkins, P. Doornenbal, E. Merchan, M. Górska, M. Lewitowicz, N. Warr, Roman Gernhäuser, K. Steiger, Jan Taprogge, Zhengyu Xu, F. Ameil, H. Hotaka, K. Yoshinaga, I. Kojouharov, H. Grawe, N. Kurz, P. A. Söderström, Norbert Pietralla, Hirofumi Watanabe, R. Wadsworth, Daiki Nishimura, G. Haefner, P. Boutachkov, Hyo Soon Jung, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Federal Ministry of Education and Research (Germany), Department of Energy (US), Bonn-Cologne Graduate School of Physics and Astronomy, and SCOAP

Subjects
Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, Astrophysics::Instrumentation and Methods for Astrophysics, Nuclear structure, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, medicine, Nuclear Experiment, 010306 general physics, 010303 astronomy & astrophysics, Nucleus
Abstract

7 pags., 4 figs. -- Presented at the Zakopane Conference on Nuclear Physics “Extremes of the Nuclear Landscape”, Zakopane, Poland, August 26–September 2, 2018. -- Open Access funded by Creative Commons Atribution Licence 4.0, The study of nuclei in the region around the N = Z doubly-magic nucleus 100Sn has been of long standing interest for the nuclear structure and nuclear astrophysics. Recently, Park et al. have reported on properties of γ-decaying isomers and isomeric ratios in the vicinity of 100Sn. That experiment was performed at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center in Japan as a part of the EURICA campaign. Neutron-deficient nuclei were produced in a fragmentation reaction of a 124Xe primary beam on a 9Be target at an energy of 345 MeV/A. Secondary ions were separated and identified in the BigRIPS fragment separator and implanted in the silicon detector array WAS3ABi. The data presented here were obtained in another experiment performed at the RIBF using the same reaction but slightly different separator settings. New results of ratios of isomeric population and half-lives of γ-decaying isomers populated in the experiment are presented., This work was carried out at the RIBF operated by the RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. The authors acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of cluster detectors. This work was partly supported by the German BMBF under contract No. 05P12PKFNE and No. 05P15PKFNA and by the U.S. DOE under grant No. DE-FG02-91ER-40609. G.H. is supported by the Bonn–Cologne Graduate School of Physics and Astronomy.

Published
2018
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3. Corrigendum to: 'Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of 92Kr, 94Kr and 96Kr' [Nucl. Phys. A 899 (2013) 1–28]

Author

K. Moschner, Herbert Hess, Kathrin Wimmer, M. Pfeiffer, D. Mücher, M. Cappellazzo, E. Fiori, M. Rudigier, C. Mihai, Marcus Scheck, D. Cline, A. Blazhev, J. M. Daugas, K. Nowak, S. Das Gupta, V. Bildstein, Roman Gernhäuser, M. Zielińska, Iain Darby, P. J. Napiorkowski, R. Krücken, Fredrik Wenander, Georgi P. Georgiev, B. Siebeck, M. Kowalczyk, K. Nomura, M. Hackstein, L. M. Robledo, Joonas Konki, D. M. Filipescu, M. Seidlitz, H. De Witte, D. Radeck, R. R. Rodríguez-Guzmán, N. Marginean, Janne Pakarinen, D. G. Jenkins, P. Reiter, G. S. Simpson, R. Lutter, L. Bettermann, B. Bastin, M. J. Vermeulen, Marc Huyse, J. Litzinger, J. Van de Walle, B. S. Nara Singh, T. Davinson, T. Kröll, C. Bernards, K. O. Zell, Jan Diriken, Stefan Heinze, T. Thomas, R. Wadsworth, M. Albers, J. Jolie, Joakim Cederkäll, Susan Rigby, P. Thöle, P. Van Duppen, D. Voulot, Liam Gaffney, Jonathan Butterworth, C. Fransen, C. Bauer, and N. Warr

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Isotope, 0103 physical sciences, Neutron, Coulomb excitation, 010306 general physics, Shape dynamics, 01 natural sciences
Published
2016
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4. Study of isomeric states in $^{198,200,202,206}$Pb and $^{206}$Hg populated in fragmentation reactions

Author

A. Gottardo, P. Thöle, D. Bazzacco, R. Menegazzo, Dirk Rudolph, Jan Taprogge, E. Wilson, I. Burrows, C. Domingo-Pardo, Pavel Golubev, Claes Fahlander, D. Mengoni, H. J. Wollersheim, A. Pullia, K. Moschner, Herbert Hess, A. Jungclaus, Luis Sarmiento, Vicente González, P. Reiter, J. Eberth, C. Michelagnoli, O. Wieland, Begoña Quintana, F. Ameil, Eric Clément, Th Moeller, Zs. Podolyák, J. Simpson, A. Gadea, Anna Wendt, M. Reese, P. Désesquelles, T. Arici, M. Hackstein, B. Bruyneel, T. Habermann, I. Kojouharov, D. Ralet, E. Gregor, Zena Patel, C. Lizarazo, C. Louchart, Pushpendra Singh, A. Givechev, R. Stegmann, M. L. Cortés, O. Stezowski, J. J. Valiente Dobon, N. Kurz, M. Górska, C. Bauer, N. Lalović, T. Alexander, E. Merchan, Enrique Sanchis, N. Goel, Edward Simpson, J. Gerl, Jnaneswari Gellanki, Norbert Pietralla, M. Bowry, C. Stahl, M. Lettmann, D. R. Napoli, R. Kumar, G. Rainovski, G. Guastalla, J. Jolie, S. Pietri, B. Birkenbach, M. D. Salsac, M. A. Bentley, D. S. Judson, H. Schaffner, P. Boutachkov, P. H. Regan, R. Wood, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AGATA, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, isomeric decays, Astrophysics::High Energy Astrophysical Phenomena, Population, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Fragmentation (mass spectrometry), Subatomic Physics, 0103 physical sciences, Gamma spectroscopy, Gamma-ray spectroscopy, 010306 general physics, education, Nuclear Experiment, Physics, education.field_of_study, Isotope, 010308 nuclear & particles physics, Nuclear shell model, direct reactions, relativistic projectile fragmentation, electromagnetic transitions, nuclear shell model, AGATA, PreSPEC-AGATA, Atomic physics, Beam (structure)
Abstract

International audience; Isomeric states in isotopes in the vicinity of doubly-magic 208Pb were populatedfollowing reactions of a relativistic 208Pb primary beam impinging on a9Be fragmentation target. Secondary beams of 198,200,202,206Pb and 206Hg wereisotopically separated and implanted in a passive stopper positioned in thefocal plane of the GSI Fragment Separator. Delayed γ rays were detected withthe Advanced Gamma Tracking Array (AGATA). Decay schemes were reevaluatedand interpreted with shell-model calculations. The momentumdependentpopulation of isomeric states in the two-nucleon hole nuclei206Pb/206Hg was found to differ from the population of multi neutron-holeisomeric states in 198,200,202Pb.

Published
2018
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5. Low collectivity of the first 2$^+$ states of $^{212,210}$Po

Author

A. Astier, A. Goldkuhle, C. Müller-Gatermann, F. Diel, D. Wölk, J. Litzinger, G. Rainovski, A. Dewald, P. Scholz, S. Ansari, Th. Braunroth, J. M. Keatings, A. Vogt, Alexander Stolz, J. Jolie, M. L. Cortés, V. Yu. Ponomarev, R. Altenkirch, C. Fransen, M. Stoyanova, Norbert Pietralla, A. Hennig, P. Spagnoletti, W. Witt, N. Warr, M. Spieker, T. Schmidt, A. Blazhev, K. O. Zell, E. Kluge, R. Stegmann, V. Karayonchev, M. Djongolov, M. Rudigier, P. Thöle, M. Beckers, M. Bast, C. Stahl, D. Kocheva, V. Werner, P. Petkov, Marcus Scheck, J. C. Zamora, Th. Kröll, K. Moschner, P. Van Isacker, M. Cappellazzo, K. A. Gladnishki, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Phonon, Attenuation, Yrast, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Quasi particles, Computer Science Applications, Education, symbols.namesake, Recoil, Excited state, 0103 physical sciences, symbols, Atomic physics, 010306 general physics, Doppler effect
Abstract

International audience; The lifetimes of the first 2+ excited states of 212,210Po were measured in two transfer reactions 208Pb(12C,8Be)212Po and 208Pb(12C,10Be)210Po by the Recoil Distance Doppler Shift (RDDS) method and by the Doppler Shift Attenuation method (DSAM), respectively. The derived absolute B(E2) values of 2.6(3) W.u. for 212Po and 1.83(28) W.u. for 210Po indicate low collectivity. It is shown that the properties of the yrast , , and states in both nuclei cannot be described consistently in the framework of nuclear shell models. It is also demonstrated in the case of 210Po that Quasi-particle Phonon Model (QPM) calculations cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2017
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6. A revised B(E2;2+ 1 $ \rightarrow$ → 0+ 1) value in the semi-magic nucleus 210Po

Author

A. Dewald, M. Spieker, D. Kocheva, P. Scholz, C. Müller-Gatermann, R. Altenkirch, V. Karayonchev, A. Blazhev, M. Djongolov, M. Rudigier, P. Thöle, K. A. Gladnishki, Norbert Pietralla, V. Yu. Ponomarev, F. Diel, S. Ansari, D. Wölk, J. M. Keatings, N. Warr, Th. Braunroth, C. Stahl, P. Van Isacker, V. Werner, G. Rainovski, A. Astier, M. Stoyanova, A. Hennig, J. Litzinger, J. Jolie, M. L. Cortés, C. Fransen, W. Witt, K. O. Zell, E. Kluge, R. Stegmann, P. Spagnoletti, P. Petkov, and Marcus Scheck

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Phonon, Yrast, Hadron, Value (computer science), State (functional analysis), 01 natural sciences, medicine.anatomical_structure, 0103 physical sciences, medicine, Nuclear fusion, MAGIC (telescope), Atomic physics, 010306 general physics, Nucleus
Abstract

The lifetimes of the $ 2^+_1$ , the $ 2^+_2$ and the $ 3^-_1$ states of$^{210}$Po have been measured in the$^{208}$Pb($^{12}$C,$^{10}$Be)$^{210}$Po transfer reaction by the Doppler-shift attenuation method. The result for the lifetime of the $ 2^+_1$ state is about three times shorter than the adopted value. However, the new value still does not allow for a consistent description of the properties of the yrast $ 2^+_1$ , $ 4^+_1$ , $ 6^+_1$ , and $ 8^+_1$ states of$^{210}$Po in the framework of nuclear shell models. Quasi-particle Phonon Model (QPM) calculations also cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2017
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7. The role of core excitations in the structure and decay of the 16(+) spin-gap isomer in Cd-96

Author

K. Moschner, H. Baba, Toshiyuki Sumikama, Y. Zhu, E. Gregor, M. Lewitowicz, Torbjörn Bäck, J. Jolie, T. Faestermann, D. G. Jenkins, Frédéric Nowacki, N. Warr, Shunji Nishimura, E. Merchan, K. Yoshinaga, Roman Gernhaeuser, H. Schaffner, A. Blazhev, N. Kurz, P. Boutachkov, F. Ameil, Hiroki Nishibata, Ayumi Yagi, I. Kojouharov, Jan Taprogge, J. Gerl, L. Maier, P. Doornenbal, Shintaro Go, D. Nishimura, H. Grawe, M. Górska, K. Steiger, H. Hotaka, T. Isobe, Ziye Xu, V. Werner, P. J. Davies, P. A. Söderström, A. Gengelbach, F. Naqvi, Hiroshi Watanabe, H. S. Jung, P. Thöle, Giuseppe Lorusso, M. Dewald, Norbert Pietralla, R. Wadsworth, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Federal Ministry of Education and Research (Germany), SCOAP, Department of Energy (US), Science and Technology Facilities Council (UK), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Proton decay, Nuclear Theory, βp-decay, γ -ray spectroscopy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Shell-model, 01 natural sciences, 7. Clean energy, WKB approximation, Nuclear physics, Subatomär fysik, 0103 physical sciences, Subatomic Physics, ddc:530, Proton emission, 010306 general physics, Wave function, Nuclear Experiment, Physics, WKB, Spectrometer, Isotope, 010308 nuclear & particles physics, β-decay, Half-life, βp-decayγ-ray spectroscopy, beta p-decay, lcsh:QC1-999, β -decay, 3. Good health, gamma-ray spectroscopy, 13. Climate action, γ-ray spectroscopy, Physics::Accelerator Physics, Atomic physics, Ground state, βp -decay, lcsh:Physics, beta-decay
Abstract

P. J. Davies et al. -- 6 pags., 4 figs., 3 tabs.-- Open Access funded by Creative Commons Atribution Licence 4.0, The first evidence for β-delayed proton emission from the 16 spin gap isomer in Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16 isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for ℓ=0,2,4 proton emission from three resonance-like states in Ag, that are populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that ℓ=2 proton emission from the resonance states, which reside ∼5 MeV above the proton separation energy, dominates the proton decay. The results highlight the importance of core-excited wavefunction components for the 16 state., This work was partially supported by the German BMBF grant 05P12PKFNE, the UK Science and Technology Facilities Council(STFC) grants ST/J000124/1 and ST/L005727/1, and the U.S. DOE grant DE-FG02-91ER40609.

Published
2017
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8. Structure of low-lying states inSm140studied by Coulomb excitation

Author

Thierry Stora, F. Giacoppo, Therese Renstrøm, F. Nowacki, D. A. Fink, V. N. Fedosseev, R. Lutter, C. Bauer, M. Zielinska, M. D. Seliverstov, P. Hoff, F. L. Bello Garrote, W. Korten, P. Reiter, P. J. Napiorkowski, J. Libert, J. P. Delaroche, Michel Girod, H. De Witte, B. Siebeck, Sebastian Rothe, S. Bönig, Sunniva Siem, H. Naïdja, Andreas Görgen, J. Srebrny, Gry Merete Tveten, P. Thöle, A. Damyanova, B. Bounthong, P. L. Molkanov, E. Rapisarda, Janne Pakarinen, Tamas Gabor Tornyi, Nobuaki Imai, N. Warr, K. Hadynska-Klek, P. Van Duppen, M. J. Vermeulen, D. Voulot, F. Wenander, A. C. Larsen, B. A. Marsh, M. Klintefjord, Institut de pharmacologie moléculaire et cellulaire (IPMC), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Recherche Saint-Antoine (UMRS893), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Heavy Ion Laboratory, University of Warsaw (UW), Department of Physics [Jyväskylä Univ] (JYU), University of Jyväskylä (JYU), European Organization for Nuclear Research (CERN), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), École des Mines de Douai (Mines Douai EMD), Institut Mines-Télécom [Paris] (IMT), Centre National de la Recherche Scientifique (CNRS)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Work (thermodynamics), Large Hadron Collider, ta114, Ion beam, 010308 nuclear & particles physics, Coulomb excitation, deformed nuclei, State (functional analysis), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Quadrupole, samarium, Atomic physics, Deformation (engineering), 010306 general physics, Excitation
Abstract

The electromagnetic structure of 140Sm was studied in a low-energy Coulomb excitation experiment with a radioactive ion beam from the REX-ISOLDE facility at CERN. The 2+ and 4+ states of the ground-state band and a second 2+ state were populated by multistep excitation. The analysis of the differential Coulomb excitation cross sections yielded reduced transition probabilities between all observed states and the spectroscopic quadrupole moment for the 2+ 1 state. The experimental results are compared to large-scale shell model calculations and beyond-mean-field calculations based on the Gogny D1S interaction with a five-dimensional collective Hamiltonian formalism. Simpler geometric and algebraic models are also employed to interpret the experimental data. The results indicate that 140Sm shows considerable γ softness, but in contrast to earlier speculation no signs of shape coexistence at low excitation energy. This work sheds more light on the onset of deformation and collectivity in this mass region. 15 pages, 12 figures ispartof: Physical Review C vol:93 issue:5 status: published

Published
2016
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9. Low-lying isovector2+valence-shell excitations ofPo212

Author

A. Astier, P. Scholz, J. Litzinger, A. Dewald, Norbert Pietralla, V. Werner, V. Karayonchev, W. Witt, Thomas Braunroth, M. Djongolov, J. Jolie, M. L. Cortés, R. Stegmann, C. Müller-Gatermann, P. Petkov, Marcus Scheck, G. Rainovski, P. Thöle, D. Wölk, K. A. Gladnishki, C. Fransen, P. Van Isacker, A. Hennig, C. Stahl, D. Kocheva, and A. Blazhev

Subjects
Physics, Isovector, 010308 nuclear & particles physics, Nuclear Theory, SHELL model, 01 natural sciences, Symmetry (physics), Excited state, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics, Spectroscopy, Valence electron, Beam (structure)
Abstract

We present the results from an experiment dedicated to search for quadrupole-collective isovector valence-shell excitations, states with so-called mixed proton-neutron symmetry (MSS), of $^{212}\mathrm{Po}$. This nucleus was studied in an $\ensuremath{\alpha}\text{-transfer}$ reaction. The lifetimes of two short-lived excited states, candidates for the one-phonon MSS, were determined by utilizing the Doppler shift attenuation method. The experimental results are in qualitative agreement with a simple $\text{single-}j$ shell model calculation, which, together with the observed lack of quadrupole collectivity, indicates that the isovector nature of low-lying states is a property of the leading single-particle valence shell configuration.

Published
2016
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10. Search for mixed-symmetry states of nuclei in the vicinity of the double-magic nucleus $^{208}$Pb

Author

G. Rainovski, P. Scholz, A. Hennig, M. Djongolov, A. Dewald, P. Van Isacker, V. Karayonchev, L. Cortes, D. Kocheva, S. Zhu, R. V. F. Janssens, P. Thöle, V. Werner, M. P. Carpenter, M. Lettmann, R. Stegmann, Th. Braunroth, T. Möller, C. J. Lister, A. Blazhev, C. Fransen, Norbert Pietralla, P. Petkov, Marcus Scheck, C. Schramm, C. Möller-Gatermann, C. Bauer, K. Gladnishki, D. Wölk, C. Stahl, J. Litzinger, J. Jolie, Grand Accélérateur National d'Ions Lourds (GANIL), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isovector, 010308 nuclear & particles physics, QC1-999, Nuclear Theory, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Symmetry (physics), 3. Good health, medicine.anatomical_structure, 0103 physical sciences, medicine, MAGIC (telescope), Atomic physics, 010306 general physics, Nuclear Experiment, Nucleus, Excitation
Abstract

This is an Open Access article distributed under the terms of Creative Commons Attribution Licence 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.; International audience; In this work we present the results from two experiments dedicated to search for quadrupole-collective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus $^{208}$Pb. $^{212}$Po was studied in an α-transfer reaction. $^{204}$Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region.

Published
2015
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11. Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of 92Kr, 94Kr and 96Kr

Author

Jan Diriken, R. Krücken, Fredrik Wenander, D. Cline, T. Kröll, B. S. Nara Singh, C. Bauer, M. Zielińska, D. Radeck, K. Moschner, M. Seidlitz, C. Fransen, L. Bettermann, Stefan Heinze, T. Davinson, Mark Huyse, A. Blazhev, G. S. Simpson, R. Wadsworth, H. De Witte, M. Pfeiffer, Herbert Hess, P. Reiter, N. Warr, Iain Darby, Kathrin Wimmer, R. Gernhäuser, M. Rudigier, M. Vermeulen, B. Bastin, Kosuke Nomura, D. M. Filipescu, J. Van de Walle, M. Cappellazzo, Georgi P. Georgiev, R. R. Rodríguez-Guzmán, Joakim Cederkäll, D. G. Jenkins, D. Mücher, K. Nowak, M. Hackstein, R. Lutter, T. Thomas, C. Mihai, K. O. Zell, P. Thöle, P. J. Napiorkowski, J. Litzinger, P. Van Duppen, Vinzenz Bildstein, M. Kowalczyk, S. Das Gupta, D. Voulot, Jonathan Butterworth, J. M. Daugas, Liam Gaffney, M. Albers, J. Jolie, L. M. Robledo, Joonas Konki, B. Siebeck, E. Fiori, Susan Rigby, N. Marginean, Janne Pakarinen, Marcus Scheck, C. Bernards, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Large Hadron Collider, ta114, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Projectile, Coulomb excitation, 01 natural sciences, 7. Clean energy, Nuclear physics, Matrix (mathematics), Excited state, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Interacting boson model, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

We report on the study of excited states in 92,94,96Kr populated via projectile Coulomb excitation at safe energies. The radioactive ion beams at energies of 2.85 MeV/u were delivered by the REX-ISOLDE facility at CERN and impinged on self-supporting 194,196Pt targets. The emitted γ -rays were detected by the Miniball detector-array. A detailed description of the experimental techniques used for extracting diagonal and transitional matrix elements and of the theoretical framework is given. The present experiment reveals the moderate evolution of the collective structure in the considered neutron-rich Kr isotopic chain, which is supported by the interacting boson model combined with the self-consistent mean-field method using a microscopic Gogny energy-density functional. The theory also suggests possible shape coexistence in the exotic nucleus 96Kr. ispartof: Nuclear Physics A vol:899 pages:1-28 status: published

Published
2013
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12. Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

Author

C. Bernards, Jan Diriken, M. Pfeiffer, K. Moschner, P. Reiter, M. Rudigier, H. De Witte, Jonathan Butterworth, J. M. Daugas, D. Voulot, Iain Darby, Mark Huyse, Takaharu Otsuka, R. R. Rodríguez-Guzmán, Liam Gaffney, R. Gernhäuser, P. Van Duppen, R. Krücken, Fredrik Wenander, Vinzenz Bildstein, N. Warr, M. Zielinska, D. Mücher, T. Kröll, B. S. Nara Singh, C. Mihai, M. Seidlitz, Joakim Cederkäll, Georgi P. Georgiev, B. Bastin, P. Thöle, D. Radeck, Susan Rigby, S. Das Gupta, D. G. Jenkins, M. Albers, C. Fransen, J. Van de Walle, R. Wadsworth, Pedro Sarriguren, T. Thomas, B. Siebeck, J. Jolie, Marcus Scheck, N. Marginean, M. Hackstein, D. M. Filipescu, L. Bettermann, Janne Pakarinen, Thomas Davinson, G. S. Simpson, P. J. Napiorkowski, E. Fiori, A. Blazhev, K. Nowak, L. M. Robledo, Joonas Konki, M. Kowalczyk, R. Lutter, Herbert Hess, K. O. Zell, Kathrin Wimmer, Kosuke Nomura, M. Vermeulen, M. Cappellazzo, Stefan Heinze, J. Litzinger, D. Cline, C. Bauer, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), REX-ISOLDE, Research unit Nuclear & Hadron Physics, and UAM. Departamento de Física Teórica

Subjects
Quantum phase transition, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], REX-ISOLDE, Nuclear Theory, QUANTUM PHASE-TRANSITIONS, General Physics and Astronomy, chemistry.chemical_element, Context (language use), Coulomb excitation, Nuclear Structure, 01 natural sciences, REGION, Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, Neutron, 010306 general physics, Nuclear Experiment, DETECTOR, INTERACTING BOSONS, Physics, EXCITATIONS, COLLECTIVE NUCLEAR-STATES, ta114, 010308 nuclear & particles physics, Krypton, Física, chemistry, Excited state, SHELL-MODEL, Interacting boson model, Atomic physics, Ground state
Abstract

The neutron-rich nuclei Kr94,96 were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2 + states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(21+) and B(E2;21+→01+) systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional. © 2012 American Physical Society., This work was supported by the BMBF under Contracts No. 06KY9136 and No. 06MT238, by ENSAR, by the DFG Cluster of Excellence Origin and Structure of the Universe, and by the grant-in-aid for scientific research for JSPS Fellows (Grant No. 217368). One of the authors (J. D.) would like to acknowledge the support of FWOVlaanderen (Belgium).

Published
2012
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