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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. 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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3. 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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4. 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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5. 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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6. Evolution of quadrupole collectivity inN=80isotones toward theZ=64subshell gap: TheB(E2;21+→01+)value ofSm142

Author

S. Ilieva, S. Bönig, C. Stahl, E. Rapisarda, H. De Witte, N. Warr, A. Blazhev, B. Siebeck, Thierry Stora, R. Lutter, K. A. Gladnishki, D. Radeck, J. Jolie, V. Werner, Fredrik Wenander, A Damyanova, G. Rainovski, Marcus Scheck, Janne Pakarinen, Norbert Pietralla, M. Thürauf, C. Bauer, R. Stegmann, D. Voulot, T. Thomas, M. Vermeulen, P. Reiter, M. Danchev, and P. Thöle

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), Quadrupole, Atomic number, Coulomb excitation, Sensitivity (control systems), Atomic physics
Abstract

It was shown that the evolution of the $B(E2;{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ values in $N$ = 80 isotones from Te to Nd is affected by the underlying subshell structure. This manifests itself in the observation of the local suppression of the $B(E2)$ value at $Z=58$ with respect to the neighboring nuclei $^{136}\mathrm{Ba}$ and $^{140}\mathrm{Nd}$. To investigate this shell sensitivity toward the $Z=64$ subshell gap, the $B(E2;{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ value of the unstable nucleus $^{142}\mathrm{Sm}$ was measured utilizing the projectile Coulomb excitation technique. The radioactive ion beam (RIB) experiment was performed at the REX-ISOLDE facility at CERN. The $B(E2)$ value of $32\phantom{\rule{0.16em}{0ex}}(4)\phantom{\rule{0.16em}{0ex}}\mathrm{W}.\mathrm{u}.$ reflects the impact of the $\ensuremath{\pi}(1{g}_{7/2}\phantom{\rule{0.16em}{0ex}}2{d}_{5/2})$ subshell closure at $Z=64$ with respect to a linear scaling of collectivity with valence proton number.

Published
2015
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7. Erratum: Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes [Phys. Rev. Lett.108, 062701 (2012)]

Author

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

Subjects
Physics, Nuclear physics, Isotope, General Physics and Astronomy, Neutron, Deformation (meteorology)
Published
2015
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8. Erratum: Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes [Phys. Rev. Lett.108, 062701 (2012)]

Author

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

Subjects
Nuclear physics, Physics, Isotope, General Physics and Astronomy, Neutron, Coulomb excitation, Deformation (meteorology)
Published
2012
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9. Study of ground and excited state decays inN≈ZAg nuclei

Author

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

Subjects
Physics, QC1-999, Excited state, Particle, Atomic physics, Spectroscopy
Abstract

A decay spectroscopy experiment was performed within the EURICA campaign at RIKEN in 2012. It aimed at the isomer and particle spectroscopy of excited states and ground states in the mass region below the doubly magic 100Sn. The N = Z nuclei 98In, 96Cd and 94Ag were of particular interest for the present study. Preliminary results on the neutron deficient nuclei 93Ag and 94Ag are presented. In 94Ag a more precise value for the half-life of the ground state’s superallowed Fermi transition was deduced. In addition the energy spectra of the mentioned decay could be reproduced through precise Geant4 simulations of the used active stopper SIMBA. This will enable us to extract Qβ values from the measured data. The decay of 93Ag is discussed based on the observed implantation-decay correlation events.

Published
2015
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