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Triaxiality of neutron-rich Ge84,86,88 from low-energy nuclear spectra

Physical Review C 2017年第1期96卷 011301(R)-011301(R)页

作者： M. Lettmann V. Werner N. Pietralla P. Doornenbal A. Obertelli T. R. Rodríguez K. Sieja G. Authelet H. Baba D. Calvet F. Château S. Chen A. Corsi A. Delbart J.-M. Gheller A. Giganon A. Gillibert V. Lapoux T. Motobayashi M. Niikura N. Paul J.-Y. Roussé H. Sakurai C. Santamaria D. Steppenbeck R. Taniuchi T. Uesaka T. Ando T. Arici A. Blazhev F. Browne A. Bruce R. J. Caroll L. X. Chung M. L. Cortés M. Dewald B. Ding F. Flavigny S. Franchoo M. Górska A. Gottardo A. Jungclaus J. Lee B. D. Linh J. Liu Z. Liu C. Lizarazo S. Momiyama K. Moschner S. Nagamine N. Nakatsuka C. Nita C. R. Nobs L. Olivier Z. Patel Zs. Podolyák M. Rudigier T. Saito C. Shand P.-A. Söderström I. Stefan V. Vaquero K. Wimmer Z. Xu Institut für Kernphysik Technische Universität Darmstadt 64289 Darmstadt Germany RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan CEA Centre de Saclay IRFU/Service de Physique Nucléaire 91191 Gif-sur-Yvette France Departamento de Física Teórica Universidad Autónoma de Madrid 28049 Madrid Spain IPHC CNRS/IN2P3 et Université de Strasbourg 67037 Strasbourg France State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 People's Republic of China Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 Darmstadt Germany Institut für Kernphysik Universität zu Köln 50937 Köln Germany School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4GJ United Kingdom Department of Physics University of Surrey Guildford GU2 7XH United Kingdom Institute for Nuclear Science and Technology VINATOM P.O. Box 5T-160 Nghia Do Hanoi Vietnam Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 People's Republic of China Institut de Physique Nucléaire Orsay IN2P3-CNRS 91406 Orsay Cedex France Instituto de Estructura de la Materia CSIC 28006 Madrid Spain Department of Physics University of Hong Kong Pokfulam Hong Kong Department of Physics Faculty of Science Kyoto University Kyoto 606-8502 Japan Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH) 077125 Bucharest Romania KU Leuven Instituut voor Kern- en Stralingsfysica 3001 Leuven Belgium

γ-ray transitions between low-spin states of the neutron-rich Ge84,86,88 were measured by means of in-flight γ-ray spectroscopy at 270 MeV/u. Excited 61+,41,2+, and 21,2+ states of Ge84,86 and 41+ and 21,2+ states of Ge88 were observed. Furthermore, a candidate for a 31+ state of Ge86 was identified. This state plays a key role in the discussion of ground-state triaxiality of Ge86, along with other features of its low-energy level scheme. A new region of triaxially deformed nuclei is proposed in the Ge isotopic chain.

关键词： Collective levels H & He induced nuclear reactions Nuclear density functional theory Nuclear many-body theory Nuclear structure & decays Nucleon induced nuclear reactions Rare & new isotopes 59 ≤ A ≤ 89 Radioactive beams Shell model

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Energetic electron-bunch generation in a phase-locked longitudinal laser electric field

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Physical Review E 2016年第4期93卷 043207-043207页

作者： K. D. Xiao T. W. Huang L. B. Ju R. Li S. L. Yang Y. C. Yang S. Z. Wu H. Zhang B. Qiao S. C. Ruan C. T. Zhou X. T. He Center for Applied Physics and Technology HEDPS and School of Physics Peking University Beijing 100871 People's Republic of China Graduate School China Academy of Engineering Physics P.O. Box 2101 Beijing 100088 People's Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100094 People's Republic of China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 People's Republic of China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 People's Republic of China College of Electronic Science and Technology Shenzhen University Shenzhen 518060 People's Republic of China

Energetic electron acceleration processes in a plasma hollow tube irradiated by an ultraintense laser pulse are investigated. It is found that the longitudinal component of the laser field is much enhanced when a linear polarized Gaussian laser pulse propagates through the plasma tube. This longitudinal field is of π/2 phase shift relative to the transverse electric field and has a π phase interval between its upper and lower parts. The electrons in the plasma tube are first pulled out by the transverse electric field and then trapped by the longitudinal electric field. The trapped electrons can further be accelerated to higher energy in the presence of the longitudinal electric field. This acceleration mechanism is clearly illustrated by both particle-in-cell simulations and single particle modelings.

关键词： Laser driven electron acceleration Plasma production & heating by laser beams, laser-foil, laser-cluster Plasma-solid interactions

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Correction to: Meeting report from the fourth meeting of the computational Modeling in Biology Network (COMBINE)

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Standards in genomic sciences 2018年第1期13卷 17页

作者： Dagmar Waltemath Frank T Bergmann Claudine Chaouiya Tobias Czauderna Padraig Gleeson Carole Goble Martin Golebiewski Michael Hucka Nick Juty Olga Krebs Nicolas Le Novère Huaiyu Mi Ion I Moraru Chris J Myers David Nickerson Brett G Olivier Nicolas Rodriguez Falk Schreiber Lucian Smith Fengkai Zhang Eric Bonnet 1Department of Systems Biology and Bioinformatics University of Rostock Rostock Germany. 2Department of Computing and Mathematical Sciences California Institute of Technology Pasadena CA USA. 4Instituto Gulbenkian de Ciência - IGC Rua da Quinta Grande Oeiras Portugal. 3IPK Gatersleben Gatersleben Germany. 5Department of Neuroscience Physiology and Pharmacology University College London London UK. 6School of Computer Science The University of Manchester Manchester UK. 7Heidelberg Institute for Theoretical Studies Heidelberg Germany. 8EMBL-European Bioinformatics Institute Wellcome Trust Genome Campus Hinxton Cambridge UK. 14The Babraham Institute Babraham Research Campus Cambridge UK. 9Department of preventive medicine Keck School of Medicine University of Southern California Los Angeles CA USA. 10Center for Cell Analysis and Modeling University of Connecticut Health Center Farmington CT USA. 11Department of Electrical and Computer Engineering University of Utah Salt Lake City USA. 12Auckland Bioengineering Institute University of Auckland Auckland New Zealand. 13Systems Bioinformatics VU University Amsterdam Amsterdam The Netherlands. 15Martin Luther University Halle-Wittenberg Halle Germany. 16Monash University Melbourne Australia. Computational Biology Unit Laboratory of Systems Biology National Institute of Allergy and Infectious Diseases NIH Bethesda MD USA. 18Institut Curie Paris France. INSERM U900 75248 Paris France. 20Mines ParisTech 77300 Fontainebleau Paris France.

[This corrects the article DOI: 10.4056/sigs.5279417.].

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Phase Diagram and High-Temperature Superconductivity of Compressed Selenium Hydrides

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Scientific Reports 2015年第1期5卷 1-8页

作者： Zhang, Shoutao Wang, Yanchao Zhang, Jurong Liu, Hanyu Zhong, Xin Song, Hai-Feng Yang, Guochun Zhang, Lijun Ma, Yanming State Key Laboratory of Superhard Materials Jilin University Changchun 130012 China Faculty of Chemistry Northeast Normal University Changchun 130024 China College of Materials Science and Engineering Key Laboratory of Automobile Materials of MOE Jilin University Changchun 130012 China LCP Institute of Applied Physics and Computational Mathematics Beijing 100088 China Software Center for High Performance Numerical Simulation China Academy of Engineering Physics Beijing 100088 China

Recent discovery of higherature superconductivity (Tc = 190 K) in sulfur hydrides at megabar pressures breaks the traditional belief on the Tc limit of 40 K for conventional superconductors, and opens up the doors in ...

Recent discovery of higherature superconductivity (T_c = 190 K) in sulfur hydrides at megabar pressures breaks the traditional belief on the T_c limit of 40 K for conventional superconductors, and opens up the doors in searching new higherature superconductors in compounds made up of light elements. Selenium is a sister and isoelectronic element of sulfur, with a larger atomic core and a weaker electronegativity. Whether selenium hydrides share similar higherature superconductivity remains elusive, but it is a subject of considerable interest. First-principles swarm structure predictions are performed in an effort to seek for energetically stable and metallic selenium hydrides at high pressures. We find the phase diagram of selenium hydrides is rather different from its sulfur analogy, which is indicated by the emergence of new phases and the change of relative stabilities. Three stable and metallic species with stoichiometries of HSe₂, HSe and H₃Se are identified above ~120 GPa and they all exhibit superconductive behaviors, of which the hydrogen-rich HSe and H₃Se phases show high T_c in the range of 40-110 K. Our simulations established the hightemperature superconductive nature of selenium hydrides and provided useful route for experimental verification.

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A Certified Reduced Basis Approach for Parametrized Linear-Quadratic Optimal Control Problems with Control Constraints ★

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IFAC-PapersOnLine 2015年第1期48卷 719-720页

作者： Eduard Bader Mark Kärcher Martin Grepl Karen Veroy-Grepl Aachen Institute for Advanced Study in Computational Engineering Science (AICES) RWTH Aachen University Schinkelstraβe 2 52062 Aachen Germany. Aachen Institute for Advanced Study in Computational Engineering Science (AICES) RWTH Aachen University Schinkelstraβe 2 52062 Aachen Germany Numerical Mathematics RWTH Aachen University Templergraben 55 52056 Aachen Germany Aachen Institute for Advanced Study in Computationa Engineering Science (AICES) RWTH Aachen University Schinkelstraβe 2 52062 Aachen Germany

In this talk, we consider the efficient and reliable solution of distributed optimal control problems governed by parametrized elliptic partial differential equations involving constraints on the control. The reduced basis method is used as a low-dimensional surrogate model to solve the optimal control problem. To this end, we introduce reduced basis spaces not only for the state and adjoint variable but also for the distributed control variable and propose rigorous error bounds for the error in the optimal control. The reduced basis optimal control problem and associated a posteriori error bounds can be efficiently evaluated in an offline-online computational procedure, thus making our approach relevant in the many-query or real-time context. We present numerical results for a model problem to show the validity of our approach.

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Towards Parallel Large-Scale Genomic Prediction by Coupling Sparse and Dense Matrix Algebra

Towards Parallel Large-Scale Genomic Prediction by Coupling ...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： Arne De Coninck Drosos Kourounis Fabio Verbosio Olaf Schenk Bernard De Baets Steven Maenhout Jan Fostier Universiteit Gent Gent BE Advanced Computing Laboratory Institute of Computational Science USI Lugano Switzerland Progeno B-9052 Zwijnaarde Belgium Faculty of Engineering and Architecture Ghent University - iMinds Belgium

Genomic prediction for plant breeding requires taking into account environmental effects and variations of genetic effects across environments. The latter can be modelled by estimating the effect of each genetic marker in every possible environmental condition, which leads to a huge amount of effects to be estimated. Nonetheless, the information about these effects is only sparsely present, due to the fact that plants are only tested in a limited number of environmental conditions. In contrast, the genotypes of the plants are a dense source of information and thus the estimation of both types of effects in one single step would require as well dense as sparse matrix formalisms. This paper presents a way to efficiently apply a high performance computing infrastructure for dealing with large-scale genomic prediction settings, relying on the coupling of dense and sparse matrix algebra.

关键词： Sparse matrices Bioinformatics Genomics Mathematical model computational modeling Predictive models

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Abstracts from the 3rd Conference on Aneuploidy and Cancer: Clinical and Experimental Aspects

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Molecular Cytogenetics 2017年第2期10卷 77-94页

作者： Athel Cornish-Bowden David Rasnick Henry H. Heng Steven Horne Batoul Abdallah Guo Liu Christine J. Ye Mathew Bloomfield Mark D. Vincent C. Marcelo Aldaz Jenny Karlsson Anders Valind Caroline Jansson David Gisselsson Jennifer A. Marshall Graves Aleksei A. Stepanenko Svitlana V. Andreieva Kateryna V. Korets Dmytro O. Mykytenko Stanislav S. Avdieiev Nataliya L. Huleyuk Vladimir P. Baklaushev Oksana A. Kovaleva Vladimir P. Chekhonin Yegor S. Vassetzky Bjorn Bakker Aaron S. Taudt Mirjam E. Belderbos David Porubsky Diana C. J. Spierings Tristan V. de Jong Nancy Halsema Hinke G. Kazemier Karina Hoekstra-Wakker Victor Guryev Peter M. Lansdorp Maria Colomé Tatché Floris Foijer Allan Bradley Eveline S. J. M. de Bont Anke van den Berg Thomas Liehr Nicolaas C. Baudoin Joshua M. Nicholson Kimberly Soto Daniela Cimini Isabel Quintanilla Jordi Camps M. Dürrbaum N. Donnelly V. Passerini C. Kruse Z. Storchová B. Habermann Daniele Mandrioli Fiorella Belpoggi Ellen K Silbergeld Melissa J Perry Rolf I. Skotheim Marthe Løvf Bjarne Johannessen Andreas M. Hoff Sen Zhao Jonas M. SveeStrømme Anita Sveen Ragnhild A. Lothe R. Hehlmann A. Voskanyan A. Fabarius Alfred Böcking Stefan Biesterfeld Leonid Berynskyy Christof Börgermann Rainer Engers Josef Dietz A. Fritz N. Page C. Tye G. Stein J. Stein N. Sehgal R. Berezney J. Vecerova B. Stojkovicz H. Ding J. Xu S. Bhattacharya Xue Gong Sarah Grasedieck Julian Swoboda Jonathan R. Pollack Frank G. Rücker Lars Bullinger Fani-Marlen Roumelioti Maria Chiourea Christina Raftopoulou Sarantis Gagos Peter Duesberg Mat Bloomfield Sunyoung Hwang Hans Tobias Gustafsson Ciara O’Sullivan Aracelli Acevedo-Colina Eduardo M. Torres Xinhe Huang Robert C. Dickson Christian Klose Andrej Schevchenko Paola Cavaliere Noah Dephoure Martha R. Stampfer Mark A. LaBarge James C. Garbe Lukas Vrba Bernard Futscher Yi-Hong Zhou Andrew L. Trinh Michelle Digman Directeur de Recherche (Émérite) Centre National de la Recherche Scientifique (CNRS) Marseilles France 549 Fairbanks Ave. Oakland California 94610 USA Wayne State University School of Medicine Detroit MI USA University of Michigan School of Medicine Ann Arbor MI USA Department of Molecular and Cell Biology UC Berkeley Donner Lab Berkeley CA USA Department of Natural Sciences and Mathematics Dominican University of California San Rafael CA USA Department of Medical Oncology London Regional Cancer Program London Ontario N6A 4L6 Canada Department of Epigenetics and Molecular Carcinogenesis University of Texas M.D. Anderson Cancer Center Science Park Smithville TX 78957 USA Department of Laboratory Medicine Division of Clinical Genetics Lund University Lund SE221 84 Sweden Department of Clinical Sciences Division of Oncology and Pathology Lund University Lund SE221 85 Sweden Skåne Regional and Univeristy Laboratories Department of Pathology Lund SE221 85 Sweden School of Life Sciences La Trobe University Melbourne Vic 3168 Australia Department of Functional Genomics Institute of Molecular Biology and Genetics Kyiv 03680 Ukraine Institute of Hereditary Pathology National Academy of Medical Sciences of Ukraine Lviv 79008 Ukraine Federal Research and Clinical Center FMBA of Russia Moscow 115682 Russia R.E. Kavetsky Institute of Experimental Pathology Oncology and Radiobiology Kyiv 03022 Ukraine V. P. Serbsky Federal Medical Research Centre of Psychiatry and Narcology Ministry of Health of the Russian Federation Moscow 119034 Russia Department of Medicinal Nanobiotechnology Pirogov Russian State Medical University Moscow 117997 Russia CNRS UMR8126 Université Paris-Sud 11 Institut de Cancérologie Gustave Roussy Villejuif 94805 France European Research Institute for the Biology of Ageing University of Groningen University Medical Center Groningen A. Deusinglaan 1 NL-9713 AV Groningen The Netherlands Department of Paediatrics University

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Nuclear-recoil energy scale in CDMS II silicon dark-matter detectors

arXiv

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arXiv 2018年

作者： Agnese, R. Anderson, A.J. Aramaki, T. Baker, W. Balakishiyeva, D. Banik, S. Barker, D. Basu Thakur, R. Bauer, D.A. Binder, T. Borgland, A. Bowles, M.A. Brink, P.L. Bunker, R. Cabrera, B. Caldwell, D.O. Calkins, R. Cartaro, C. Cerdeño, D.G. Chang, Y.-Y. Chagani, H. Chen, Y. Cooley, J. Cornell, B. Cushman, P. Daal, M. Doughty, T. Dragowsky, E.M. Esteban, L. Fallows, S. Fascione, E. Figueroa-Feliciano, E. Fritts, M. Gerbier, G. Germond, R. Ghaith, M. Godfrey, G.L. Golwala, S.R. Hall, J. Harris, H.R. Holmgren, D. Hong, Z. Hsu, L. Huber, M.E. Iyer, V. Jardin, D. Jastram, A. Jena, C. Kelsey, M.H. Kennedy, A. Kubik, A. Kurinsky, N.A. Leder, A. Lopez Asamar, E. Lukens, P. MacDonell, D. Mahapatra, R. Mandic, V. Mast, N. McCarthy, K.A. Miller, E.H. Mirabolfathi, N. Moffatt, R.A. Mohanty, B. Moore, D. Morales Mendoza, J.D. Nelson, J. Oser, S.M. Page, K. Page, W.A. Partridge, R. Penalver Martinez, M. Pepin, M. Phipps, A. Poudel, S. Pyle, M. Qiu, H. Rau, W. Redl, P. Reisetter, A. Roberts, A. Rogers, H.E. Robinson, A.E. Saab, T. Sadoulet, B. Sander, J. Schneck, K. Schnee, R.W. Scorza, S. Senapati, K. Serfass, B. Speller, D. Di Stefano, P.C.F. Stein, M. Street, J. Tanaka, H.A. Toback, D. Underwood, R. Villano, A.N. von Krosigk, B. Welliver, B. Wilson, J.S. Wilson, M.J. Wright, D.H. Yellin, S. Yen, J.J. Young, B.A. Zhang, X. Zhao, X. Department of Physics University of Florida GainesvilleFL32611 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Menlo ParkCA94025 United States Department of Physics and Astronomy Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University College StationTX77843 United States Department of Physics Southern Methodist University DallasTX75275 United States School of Physical Sciences National Institute of Science Education and Research HBNI Jatni752050 India gSchool of Physics & Astronomy University of Minnesota MinneapolisMN55455 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Physics University of South Dakota VermillionSD57069 United States Department of Physics South Dakota School of Mines & Technology Rapid CitySD57701 United States Pacific Northwest National Laboratory RichlandWA99352 United States Department of Physics Stanford University StanfordCA94305 United States Department of Physics University of California Santa BarbaraCA93106 United States Instituto de Física Teórica UAM/CSIC Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics Durham University DurhamDH1 3LE United Kingdom qDivision of Physics Mathematics & Astronomy California Institute of Technology PasadenaCA91125 United States Department of Physics Syracuse University SyracuseNY13244 United States Department of Physics University of Alberta EdmontonT6G 2E1 Canada Department of Physics University of California BerkeleyCA94720 United States Department of Physics Case Western Reserve University ClevelandOH44106 United States Research Computing University Technologies Case Western Reserve University ClevelandOH44106 United

The Cryogenic Dark Matter Search (CDMS II) experiment aims to detect dark matter particles that elastically scatter from nuclei in semiconductor detectors. The resulting nuclear-recoil energy depositions are detected by ionization and phonon sensors. Neutrons produce a similar spectrum of low-energy nuclear recoils in such detectors, while most other backgrounds produce electron recoils. The absolute energy scale for nuclear recoils is necessary to interpret results correctly. The energy scale can be determined in CDMS II silicon detectors using neutrons incident from a broad-spectrum 252Cf source, taking advantage of a prominent resonance in the neutron elastic scattering cross section of silicon at a recoil (neutron) energy near 20 (182) keV. Results indicate that the phonon collection efficiency for nuclear recoils is 4.8+0−0..79% lower than for electron recoils of the same energy. Comparisons of the ionization signals for nuclear recoils to those measured previously by other groups at higher electric fields indicate that the ionization collection efficiency for CDMS II silicon detectors operated at ∼4 V/cm is consistent with 100% for nuclear recoils below 20 keV and gradually decreases for larger energies to ∼75% at 100 keV. The impact of these measurements on previously published CDMS II silicon results is small. Copyright © 2018, The Authors. All rights reserved.

关键词： Phonons

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Non-Isotropic Jacobi Spectral and Pseudospectral Methods in Three Dimensions

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数学研究 2015年第3期48卷 222-249页

作者： Yujian Jiao Sheng Chen Benyu Guo Department of Mathematics Shanghai Normal University Shanghai 200234P.R.China Scientific Computing Key Laboratory of Shanghai Universities E-institute for Computational Science of Shanghai Universities School of Mathematical Sciences Xiamen University Xiamen 361005Fujian Province P.R.China

Non-isotropic Jacobi orthogonal approximation and Jacobi-Gauss type interpolation in three dimensions are investigated. The basic approximation results are established, which serve as the mathematical foundation of spectral and pseudospectral methods for singular problems, as well as problems defined on axisymmetric domains and some unbounded domains. The spectral and pseudospectral schemes are provided for two model problems. Their spectral accuracy is proved. Numerical results demonstrate the high efficiency of suggested algorithms.

关键词： Jacobi spectral and pseudospectral methods in three dimensions singular problems

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Properties of γ-decaying isomers and isomeric ratios in the Sn100 region

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Physical Review C 2017年第4期96卷 044311-044311页

作者： J. Park R. Krücken D. Lubos R. Gernhäuser M. Lewitowicz S. Nishimura D. S. Ahn H. Baba B. Blank A. Blazhev P. Boutachkov F. Browne I. Čeliković G. de France P. Doornenbal T. Faestermann Y. Fang N. Fukuda J. Giovinazzo N. Goel M. Górska H. Grawe S. Ilieva N. Inabe T. Isobe A. Jungclaus D. Kameda G. D. Kim Y.-K. Kim I. Kojouharov T. Kubo N. Kurz G. Lorusso K. Moschner D. Murai I. Nishizuka Z. Patel M. M. Rajabali S. Rice H. Sakurai H. Schaffner Y. Shimizu L. Sinclair P.-A. Söderström K. Steiger T. Sumikama H. Suzuki H. Takeda Z. Wang H. Watanabe J. Wu Z. Y. Xu TRIUMF 4004 Wesbrook Mall Vancouver British Columbia Canada V6T 2A3 Department of Physics and Astronomy University of British Columbia Vancouver British Columbia Canada V6T 1Z1 Physik Department Technische Universität München D-85748 Garching Germany RIKEN Nishina Center Wako-shi Saitama 351-0198 Japan Excellence Cluster Universe Technische Universität München D-85748 Garching Germany Grand Accélérateur National d'Ions Lourds (GANIL) CEA/DSM-CNRS/IN2P3 Boulevard H. Becquerel 14076 Caen France Centre d'Etudes Nucléaires de Bordeaux-Gradignan 19 Chemin du Solarium CS 10120 F-33175 Gradignan Cedex France Institute of Nuclear Physics University of Cologne D-50937 Cologne Germany GSI Helmholtzzentrum für Schwerionenforschung GmbH D-64291 Darmstadt Germany School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4GJ United Kingdom Vinča Institue of Nuclear Sciences University of Belgrade 11000 Belgrade Serbia Osaka University Machikaneyama-machi 1-1 Osaka 560-0043 Toyonaka Japan Technische Universität Darmstadt D-64289 Darmstadt Germany Instituto de Estructura de la Materia IEM-CSIC E-28006 Madrid Spain Rare Isotope Science Project Institute for Basic Science Daejeon 305-811 Republic of Korea Department of Nuclear Engineering Hanyang University Seoul 133-791 Republic of Korea Department of Physics Faculty of Science Tohoku University Sendai 980-0845 Japan Department of Physics University of Surrey Guildford GU2 7XH United Kingdom University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan University of York York YO10 5DD United Kingdom Beihang University Beijing 100191 China Department of Physics Peking University Beijing 100871 China

Half-lives and energies of γ rays emitted in the decay of isomeric states of nuclei in the vicinity of the doubly magic Sn100 were measured in a decay spectroscopy experiment at Rikagaku Kenkyusho (The institute of Physical and Chemical Research) of Japan Nishina Center. The measured half-lives, some with improved precision, are consistent with literature values. Three new results include a 55-keV E2γ ray from a new (4+) isomer with T1/2=0.23(6)μs in Rh92, a 44-keV E2γ ray from the (15+) isomer in Ag96, and T1/2(6+)=13(2) ns in Cd98. Shell-model calculations of electromagnetic transition strengths in the (p1/2,g9/2) model space agree with the experimental results. In addition, experimental isomeric ratios were compared to the theoretical predictions derived with an abrasion-ablation model and the sharp cutoff model. The results agreed within a factor of 2 for most isomers. From the nonobservation of time-delayed γ rays in Sn100, new constraints on the T1/2, γ-ray energy, and internal conversion coefficients are proposed for the hypothetical isomer in Sn100.

关键词： Electromagnetic transitions Isomer decays Lifetimes & widths Nuclear structure & decays 59 ≤ A ≤ 89 90 ≤ A ≤ 149 Shell model

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