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arXiv 2023年

作者： Jovanovic, Nemanja Gatkine, Pradip Anugu, Narsireddy Amezcua-Correa, Rodrigo Thakur, Ritoban Basu Beichman, Charles Bender, Chad Berger, Jean-Philippe Bigioli, Azzurra Bland-Hawthorn, Joss Bourdarot, Guillaume Bradford, Charles M. Broeke, Ronald Bryant, Julia Bundy, Kevin Cheriton, Ross Cvetojevic, Nick Diab, Momen Diddams, Scott A. Dinkelaker, Aline N. Duis, Jeroen Eikenberry, Stephen Ellis, Simon Endo, Akira Figer, Donald F. Fitzgerald, Michael Gris-Sanchez, Itandehui Gross, Simon Grossard, Ludovic Guyon, Olivier Haffert, Sebastiaan Y. Halverson, Samuel Harris, Robert J. He, Jinping Herr, Tobias Hottinger, Philipp Huby, Elsa Ireland, Michael Jenson-Clem, Rebecca Jewell, Jeffrey Jocou, Laurent Kraus, Stefan Labadie, Lucas Lacour, Sylvestre Laugier, Romain Lawniczuk, Katarzyna Lin, Jonathan Leifer, Stephanie Leon-Saval, Sergio Martin, Guillermo Martinache, Frantz Martinod, Marc-Antoine Mazin, Benjamin A. Minardi, Stefano Monnier, John D. Moreira, Reinan Mourard, Denis Nayak, Abani Shankar Norris, Barnaby Obrzud, Ewelina Perraut, Karine Reynaud, François Sallum, Steph Schiminovich, David Schwab, Christian Serbayn, Eugene Soliman, Sherif Stoll, Andreas Tang, Liang Tuthill, Peter Vahala, Kerry Vasisht, Gautam Veilleux, Sylvain Walter, Alexander B. Wollack, Edward J. Xin, Yinzi Yang, Zongyin Yerolatsitis, Stephanos Zhang, Yang Zou, Chang-Ling Department of Astronomy California Institute of Technology PasadenaCA United States The CHARA Array of Georgia State University Mount Wilson Observatory Mount WilsonCA91203 United States CREOL The College of Optics and Photonics University of Central Florida OrlandoFL United States IPAC NASA Exoplanet Science Institute Jet Propulsion Laboratory California Institute of Technology PasadenaCA United States Steward Observatory University of Arizona TucsonAZ United States Institut de Planétologie et d'Astrophysique UGA CNRS France Katholieke Universiteit Leuven Belgium School of Physics The University of Sydney Australia Max Planck Institute for Extraterrestrial Physics Garching Germany Jet Propulsion Laboratory California Institute of Technology PasadenaCA United States Bright Photonics BV Eindhoven Netherlands Department of Astronomy and Astrophysics University of California Santa CruzCA United States Advanced Electronics and Photonics Research Centre National Research Council Canada Ottawa Canada Université Côte d’Azur Observatoire de la Côte d’Azur CNRS Laboratoire Lagrange France Dunlap Institute for Astronomy and Astrophysics University of Toronto Toronto Canada Electrical Computer and Energy Engineering Department of Physics University of Colorado BoulderCO United States Potsdam Germany PHIX Photonics Assembly Enschede Netherlands Australian Astronomical Optics Macquarie University NSW Australia Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft Netherlands Center for Detectors Rochester Institute of Technology RochesterNY United States UCLA Physics & Astronomy Department Los AngelesCA United States ITEAM Research Institute Universitat Politècnica de València Valencia Spain MQ Photonics Research Centre Macquarie University NSW Australia XLIM Research Institute University of Limoges France Subaru Telescope National Astronomical Observatory of Japan National Institute of Natural Scien

Photonic technologies offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example to date is the ESO Gravity instrument at the Very Large Telescope in Chile that combines the light-gathering power of four 8 m telescopes through a complex photonic interferometer. Fully integrated astrophotonic devices stand to offer critical advantages for instrument development, including extreme miniaturization when operating at the diffraction-limit, as well as integration, superior thermal and mechanical stabilization owing to the small footprint, and high replicability offering significant cost savings. Numerous astrophotonic technologies have been developed to address shortcomings of conventional instruments to date, including for example the development of photonic lanterns to convert from multimode inputs to single mode outputs, complex aperiodic fiber Bragg gratings to filter OH emission from the atmosphere, complex beam combiners to enable long baseline interferometry with for example, ESO Gravity, and laser frequency combs for high precision spectral calibration of spectrometers. Despite these successes, the facility implementation of photonic solutions in astronomical instrumentation is currently limited because of 1) low throughputs from coupling to fibers, coupling fibers to chips, propagation and bend losses, device losses, etc., 2) difficulties with scaling to large channel count devices needed for large bandwidths and high resolutions, and 3) efficient integration of photonics with detectors, to name a few. In this roadmap, we identify 23 key areas that need further development. We outline the challenges and advances needed across those areas covering design tools, simulation capabilities, fabrication processes, the need for entirely new components, integration and hybridization and the characterization of devices. To realize these advances the astrophotonics community will have to work cooperatively with industr

关键词： Fiber Bragg gratings

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Author Correction: Constrained catecholamines gain β2AR selectivity through allosteric effects on pocket dynamics

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Nature Communications 2023年第1期14卷 1页

作者： Xinyu Xu Xiangyu Liu Jeremy Shonberg Jonas Kaindl Anne Stößel Luis Maul Harald Hübner Peter Gmeiner Mary J. Clark Daniel Mayer Roger K. Sunahara Kunio Hirata A. J. Venkatakrishnan Ron O. Dror Brian K. Kobilka State Key laboratory of Membrane Biology Tsinghua-Peking Center for Life Sciences School of Pharmaceutical Sciences Tsinghua University Beijing 100084 China Beijing Frontier Research Center for Biological Structure Beijing Advanced Innovation Center for Structural Biology Tsinghua University Beijing 100084 China Beijing Key Laboratory of Cardiovascular Receptors Research Peking University Beijing China Department of Chemistry and Pharmacy Medicinal Chemistry Friedrich-Alexander University Erlangen-Nurnberg Nikolaus-Fiebiger-Straße 10 91058 Erlangen Germany Department of Pharmacology University of California San Diego School of Medicine 9500 Gilman Drive La Jolla California 92093 USA Advanced Photon Technology Division Research Infrastructure Group SR Life Science Instrumentation Unit RIKEN/SPring-8 Center 1-1-1 Kouto Sayo-cho Sayo-gun Hyogo 679-5148 Japan Precursory Research for Embryonic Science and Technology (PRESTO) Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan Department of Computer Science Stanford University Stanford CA 94305 USA Department of Molecular and Cellular Physiology Stanford University School of Medicine Stanford CA 94305 USA Department of Structural Biology Stanford University School of Medicine Stanford CA 94305 USA Institute for Computational and Mathematical Engineering Stanford University Stanford CA 94305 USA

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BigNeuron: a resource to benchmark and predict performance of algorithms for automated tracing of neurons in light microscopy datasets

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Nature methods 2023年第6期20卷 824-835页

作者： Linus Manubens-Gil Zhi Zhou Hanbo Chen Arvind Ramanathan Xiaoxiao Liu Yufeng Liu Alessandro Bria Todd Gillette Zongcai Ruan Jian Yang Miroslav Radojević Ting Zhao Li Cheng Lei Qu Siqi Liu Kristofer E Bouchard Lin Gu Weidong Cai Shuiwang Ji Badrinath Roysam Ching-Wei Wang Hongchuan Yu Amos Sironi Daniel Maxim Iascone Jie Zhou Erhan Bas Eduardo Conde-Sousa Paulo Aguiar Xiang Li Yujie Li Sumit Nanda Yuan Wang Leila Muresan Pascal Fua Bing Ye Hai-Yan He Jochen F Staiger Manuel Peter Daniel N Cox Michel Simonneau Marcel Oberlaender Gregory Jefferis Kei Ito Paloma Gonzalez-Bellido Jinhyun Kim Edwin Rubel Hollis T Cline Hongkui Zeng Aljoscha Nern Ann-Shyn Chiang Jianhua Yao Jane Roskams Rick Livesey Janine Stevens Tianming Liu Chinh Dang Yike Guo Ning Zhong Georgia Tourassi Sean Hill Michael Hawrylycz Christof Koch Erik Meijering Giorgio A Ascoli Hanchuan Peng Institute for Brain and Intelligence Southeast University Nanjing China. Microsoft Corporation Redmond WA USA. Tencent AI Lab Bellevue WA USA. Computing Environment and Life Sciences Directorate Argonne National Laboratory Lemont IL USA. Kaya Medical Seattle WA USA. University of Cassino and Southern Lazio Cassino Italy. Center for Neural Informatics Structures and Plasticity Krasnow Institute for Advanced Study George Mason University Fairfax VA USA. Faculty of Information Technology Beijing University of Technology Beijing China. Beijing International Collaboration Base on Brain Informatics and Wisdom Services Beijing China. Nuctech Netherlands Rotterdam the Netherlands. Janelia Research Campus Howard Hughes Medical Institute Ashburn VA USA. Department of Electrical and Computer Engineering University of Alberta Edmonton Alberta Canada. Ministry of Education Key Laboratory of Intelligent Computation and Signal Processing Anhui University Hefei China. Paige AI New York NY USA. Scientific Data Division and Biological Systems and Engineering Division Lawrence Berkeley National Lab Berkeley CA USA. Helen Wills Neuroscience Institute and Redwood Center for Theoretical Neuroscience UC Berkeley Berkeley CA USA. RIKEN AIP Tokyo Japan. Research Center for Advanced Science and Technology (RCAST) The University of Tokyo Tokyo Japan. School of Computer Science University of Sydney Sydney New South Wales Australia. Texas A&M University College Station TX USA. Cullen College of Engineering University of Houston Houston TX USA. Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology Taipei Taiwan. National Centre for Computer Animation Bournemouth University Poole UK. PROPHESEE Paris France. Department of Neuroscience Columbia University New York NY USA. Mortimer B. Zuckerman Mind Brain Behavior Institute Columbia University New York NY USA. Department of Computer Science Northern Illinois Universit

BigNeuron is an open community bench-testing platform with the goal of setting open standards for accurate and fast automatic neuron tracing. We gathered a diverse set of image volumes across several species that is representative of the data obtained in many neuroscience laboratories interested in neuron tracing. Here, we report generated gold standard manual annotations for a subset of the available imaging datasets and quantified tracing quality for 35 automatic tracing algorithms. The goal of generating such a hand-curated diverse dataset is to advance the development of tracing algorithms and enable generalizable benchmarking. Together with image quality features, we pooled the data in an interactive web application that enables users and developers to perform principal component analysis, t-distributed stochastic neighbor embedding, correlation and clustering, visualization of imaging and tracing data, and benchmarking of automatic tracing algorithms in user-defined data subsets. The image quality metrics explain most of the variance in the data, followed by neuromorphological features related to neuron size. We observed that diverse algorithms can provide complementary information to obtain accurate results and developed a method to iteratively combine methods and generate consensus reconstructions. The consensus trees obtained provide estimates of the neuron structure ground truth that typically outperform single algorithms in noisy datasets. However, specific algorithms may outperform the consensus tree strategy in specific imaging conditions. Finally, to aid users in predicting the most accurate automatic tracing results without manual annotations for comparison, we used support vector machine regression to predict reconstruction quality given an image volume and a set of automatic tracings.

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Constraints on Heavy Decaying Dark Matter from 570 Days of LHAASO Observations

arXiv

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arXiv 2022年

作者： Cao, Zhen Aharonian, F. An, Q. Axikegu Bai, L.X. Bai, Y.X. Bao, Y.W. Bastieri, D. Bi, X.J. Bi, Y.J. Cai, J.T. Cao, Zhe Chang, J. Chang, J.F. Chen, E.S. Chen, Liang Chen, Long Chen, M.J. Chen, M.L. Chen, Q.H. Chen, S.H. Chen, S.Z. Chen, T.L. Chen, Y. Cheng, H.L. Cheng, N. Cheng, Y.D. Cui, S.W. Cui, X.H. Cui, Y.D. D'Ettorre Piazzoli, B. Dai, B.Z. Dai, H.L. Dai, Z.G. Danzengluobu Della Volpe, D. Duan, K.K. Fan, J.H. Fan, Y.Z. Fan, Z.X. Fang, J. Fang, K. Feng, C.F. Feng, L. Feng, S.H. Feng, X.T. Feng, Y.L. Gao, B. Gao, C.D. Gao, L.Q. Gao, Q. Gao, W. Gao, W.K. Ge, M.M. Geng, L.S. Gong, G.H. Gou, Q.B. Gu, M.H. Guo, F.L. Guo, J.G. Guo, X.L. Guo, Y.Q. Guo, Y.Y. Han, Y.A. He, H.H. He, H.N. He, S.L. He, X.B. He, Y. Heller, M. Hor, Y.K. Hou, C. Hou, X. Hu, H.B. Hu, Q. Hu, S. Hu, S.C. Hu, X.J. Huang, D.H. Huang, W.H. Huang, X.T. Huang, X.Y. Huang, Y. Huang, Z.C. Ji, X.L. Jia, H.Y. Jia, K. Jiang, K. Jiang, Z.J. Jin, M. Kang, M.M. Ke, T. Kuleshov, D. Levochkin, K. Li, B.B. Li, Cheng Li, Cong Li, F. Li, H.B. Li, H.C. Li, H.Y. Li, J. Li, Jian Li, Jie Li, K. Li, W.L. Li, X.R. Li, Xin Li, Y.Z. Li, Zhe Li, Zhuo Liang, E.W. Liang, Y.F. Lin, S.J. Liu, B. Liu, C. Liu, D. Liu, H. Liu, H.D. Liu, J. Liu, J.L. Liu, J.S. Liu, J.Y. Liu, M.Y. Liu, R.Y. Liu, S.M. Liu, W. Liu, Y. Liu, Y.N. Long, W.J. Lu, R. Luo, Q. Lv, H.K. Ma, B.Q. Ma, L.L. Ma, X.H. Mao, J.R. Masood, A. Min, Z. Mitthumsiri, W. Nan, Y.C. Ou, Z.W. Pang, B.Y. Pattarakijwanich, P. Pei, Z.Y. Qi, M.Y. Qi, Y.Q. Qiao, B.Q. Qin, J.J. Ruffolo, D. Sáiz, A. Shao, C.Y. Shao, L. Shchegolev, O. Sheng, X.D. Shi, J.Y. Song, H.C. Stenkin, Yu.V. Stepanov, V. Su, Y. Sun, Q.N. Sun, X.N. Sun, Z.B. Tam, P.H.T. Tang, Z.B. Tian, W.W. Wang, B.D. Wang, C. Wang, H. Wang, H.G. Wang, J.C. Wang, J.S. Key Laboratory of Particle Astrophyics Experimental Physics Division Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China University of Chinese Academy of Sciences Beijing100049 China Tianfu Cosmic Ray Research Center Sichuan Chengdu China Dublin Institute for Advanced Studies 31 Fitzwilliam Place 2 Dublin Ireland Max-Planck-Institut for Nuclear Physics P.O. Box 103980 Heidelberg69029 Germany State Key Laboratory of Particle Detection and Electronics China University of Science and Technology of China Anhui Hefei230026 China School of Physical Science and Technology School of Information Science and Technology Southwest Jiaotong University Sichuan Chengdu610031 China College of Physics Sichuan University Sichuan Chengdu610065 China School of Astronomy and Space Science Nanjing University Jiangsu Nanjing210023 China Center for Astrophysics Guangzhou University Guangdong Guangzhou510006 China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Jiangsu Nanjing210023 China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai200030 China Ministry of Education Tibet Lhasa850000 China National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Hebei Normal University Hebei Shijiazhuang050024 China Zhuhai519000 China Dipartimento di Fisica Dell'Università di Napoli 'Federico II' Complesso Universitario di Monte Sant'Angelo via Cinthia Napoli80126 Italy School of Physics and Astronomy Yunnan University Yunnan Kunming650091 China Département de Physique Nucléaire et Corpusculaire Faculté de Sciences Université de Genève 24 Quai Ernest Ansermet Geneva1211 Switzerland Institute of Frontier and Interdisciplinary Science Shandong University Shandong Qingdao266237 China Department of Engineering Physics Tsinghua University Beijing100084

The kilometer squarearray (KM2A) of the large high altitude air shower observatory (LHAASO) aims at surveying the northern γ-ray sky at energies above 10 TeV with unprecedented sensitivity. γ-ray observations have long been one of the most powerful tools for dark matter searches, as, e.g., high-energy γrays could be produced by the decays of heavy dark matter particles. In this Letter, we present the first dark matter analysis with LHAASO-KM2A, using the first 340 days of data from 1/2-KM2A and 230 days of data from 3/4-KM2A. Several regions of interest are used to search for a signal and account for the residual cosmic-ray background after γ/hadron separation. We find no excess of dark matter signals, and thus place some of the strongest γ-ray constraints on the lifetime of heavy dark matter particles with mass between 105and 109GeV. Our results with LHAASO are robust, and have important implications for dark matter interpretations of the diffuse astrophysical high-energy neutrino emission. © 2022, CC BY.

关键词： Gamma rays

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Prominence of Pairing in Inclusive (p,2p) and (p,pn) Cross Sections from Neutron-Rich Nuclei

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Physical Review Letters 2019年第16期122卷 162503-162503页

作者： N. Paul A. Obertelli C. A. Bertulani A. Corsi P. Doornenbal J. L. Rodriguez-Sanchez G. Authelet H. Baba D. Calvet F. Château S. Chen A. Delbart J.-M. Gheller A. Giganon A. Gillibert T. Isobe V. Lapoux M. Matsushita S. Momiyama T. Motobayashi M. Niikura H. Otsu C. Péron A. Peyaud E. C. Pollacco J.-Y. Roussé H. Sakurai C. Santamaria M. Sasano Y. Shiga D. Steppenbeck S. Takeuchi R. Taniuchi T. Uesaka H. Wang K. Yoneda T. Ando T. Arici A. Blazhev F. Browne A. M. Bruce R. Carroll L. X. Chung M. L. Cortés M. Dewald B. Ding Zs. Dombradi F. Flavigny S. Franchoo F. Giacoppo M. Górska A. Gottardo K. Hadynska-Klek Z. Korkulu S. Koyama Y. Kubota A. Jungclaus J. Lee M. Lettmann B. D. Linh J. Liu Z. Liu C. Lizarazo C. Louchart R. Lozeva K. Matsui T. Miyazaki K. Moschner S. Nagamine N. Nakatsuka C. Nita S. Nishimura C. R. Nobs L. Olivier S. Ota Z. Patel Zs. Podolyák M. Rudigier E. Sahin T. Y. Saito C. Shand P.-A. Söderström I. G. Stefan T. Sumikama D. Suzuki R. Orlandi V. Vaquero Zs. Vajta V. Werner K. Wimmer J. Wu Z. Xu IRFU CEA Université Paris–Saclay F-91191 Gif-sur-Yvette France RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan Institut für Kernphysik Technische Universität Darmstadt D-64289 Darmstadt Germany Department of Physics and Astronomy Texas A&M University-Commerce Commerce Texas 75429-3011 USA GSI Helmholtzzentrum für Schwerionenforschung GmbH D-64291 Darmstadt Germany School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 People’s Republic of China Center for Nuclear Study The University of Tokyo RIKEN campus Wako Saitama 351-0198 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Rikkyo University 3-34-1 Nishi-Ikebukuro Toshima Tokyo 172-8501 Japan Justus-Liebig-Universität Giessen D-35392 Giessen Germany Institut für Kernphysik Universität zu Köln D-50937 Köln Germany School of Computing Engineering and Mathematics University of Brighton Brighton England BN2 4GJ United Kingdom Department of Physics University of Surrey Guildford England 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 MTA Atomki P.O. Box 51 Debrecen H-4001 Hungary Institut de Physique Nucléaire CNRS-IN2P3 Université Paris–Sud Université Paris–Saclay F-91406 Orsay Cedex France Department of Physics University of Oslo N-0316 Oslo Norway Instituto de Estructura de la Materia CSIC 28006 Madrid Spain Department of Physics The University of Hong Kong Pokfulam Hong Kong IPHC CNRS/IN2P3 Université de Strasbourg F-67037 Strasbourg France CSNSM CNRS/IN2P3 Université Paris–Sud F-91405 Orsay Campus France Department of Physics Faculty of Science Kyoto University Kyoto 606-8502 Japan Horia H

Fifty-five inclusive single nucleon-removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at ∼250 MeV/nucleon are measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons as compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting, contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semimicroscopic model predictions, highlighting the enhanced role of low-lying level densities in nucleon-removal cross sections from loosely bound nuclei.

关键词： Direct reactions H & He induced nuclear reactions

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First observation of γ rays emitted from excited states south-east of Sn132: The πg9/2−1⊗νf7/2 multiplet of In83132

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Physical Review C 2016年第4期93卷 041301(R)-041301(R)页

作者： A. Jungclaus A. Gargano H. Grawe J. Taprogge S. Nishimura P. Doornenbal G. Lorusso Y. Shimizu G. S. Simpson P.-A. Söderström T. Sumikama Z. Y. Xu H. Baba F. Browne N. Fukuda R. Gernhäuser G. Gey N. Inabe T. Isobe H. S. Jung D. Kameda G. D. Kim Y.-K. Kim I. Kojouharov T. Kubo N. Kurz Y. K. Kwon Z. Li H. Sakurai H. Schaffner K. Steiger H. Suzuki H. Takeda Zs. Vajta H. Watanabe J. Wu A. Yagi K. Yoshinaga S. Bönig L. Coraggio J.-M. Daugas F. Drouet A. Gadea S. Ilieva N. Itaco T. Kröll A. Montaner-Pizá K. Moschner D. Mücher H. Nishibata A. Odahara R. Orlandi A. Wendt Instituto de Estructura de la Materia CSIC E-28006 Madrid Spain Istituto Nazionale di Fisica Nucleare Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 Darmstadt Germany Departamento de Física Teórica Universidad Autónoma de Madrid E-28049 Madrid Spain RIKEN Nishina Center RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan National Physical Laboratory NPL Teddington Middlesex TW11 0LW United Kingdom Department of Physics University of Surrey Guildford GU2 7XH United Kingdom LPSC Université Joseph Fourier Grenoble 1 CNRS/IN2P3 Institut National Polytechnique de Grenoble F-38026 Grenoble Cedex France Department of Physics Tohoku University Aoba Sendai Miyagi 980-8578 Japan Department of Physics University of Tokyo Hongo 7-3-1 Bunkyo-ku 113-0033 Tokyo Japan School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4JG United Kingdom Physik Department E12 Technische Universität München D-85748 Garching Germany Institut Laue-Langevin B.P. 156 F-38042 Grenoble Cedex 9 France Department of Physics Chung-Ang University Seoul 156-756 Republic of Korea 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 School of Physics and State key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China MTA Atomki P.O. Box 51 Debrecen H-4001 Hungary Department of Physics Osaka University Machikaneyama-machi 1-1 Osaka 560-0043 Toyonaka Japan Department of Physics Faculty of Science and Technology Tokyo University of Science 2641 Yamazaki Noda Chiba Japan Institut für Kernphysik Technische Universität Darmstadt D-64289 Darmstadt Germany CEA DAM DIF 91297 Arpajon cedex France Instituto de Física Corpuscular CSIC-Univ. of Valencia E-46980 Paterna Spain Seconda Universit di Napoli Dipartimento di Matematica e Fisic

For the first time, the γ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn132, a region in which experimental information so far is limited to ground-state properties. Six γ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the β-delayed neutron emission from Cd85133, populated in the projectile fission of a U238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the π0g9/2−1⊗ν1f7/2 particle-hole multiplet in In83132. In addition, theoretical estimates based on a scaling of the two-body matrix elements for the πh11/2−1⊗νg9/2 analog multiplet in Tl127208, one major proton and one major neutron shell above, are presented.

关键词： Beta decay 90 ≤ A ≤ 149 Radioactive beams Shell model

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Shell structure of the neutron-rich isotopes Co69,71,73

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Physical Review C 2020年第3期101卷 034314-034314页

作者： T. Lokotko S. Leblond J. Lee P. Doornenbal A. Obertelli A. Poves F. Nowacki K. Ogata K. Yoshida G. Authelet H. Baba D. Calvet F. Château S. Chen A. Corsi A. Delbart J.-M. Gheller A. Gillibert T. Isobe V. Lapoux M. Matsushita S. Momiyama T. Motobayashi M. Niikura H. Otsu C. Péron A. Peyaud E. C. Pollacco J.-Y. Roussé H. Sakurai C. Santamaria Z. Y. Xu M. Sasano Y. Shiga S. Takeuchi R. Taniuchi T. Uesaka H. Wang V. Werner F. Browne L. X. Chung Zs. Dombradi S. Franchoo F. Giacoppo A. Gottardo K. Hadynska-Klek Z. Korkulu S. Koyama Y. Kubota M. Lettmann C. Louchart R. Lozeva K. Matsui T. Miyazaki S. Nishimura L. Olivier S. Ota Z. Patel E. Sahin C. Shand P.-A. Söderström I. Stefan D. Steppenbeck T. Sumikama D. Suzuki Zs. Vajta J. Wu Department of Physics The University of Hong Kong Pokfulam Hong Kong RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan CEA Centre de Saclay IRFU/Service de Physique Nucléaire F-91191 Gif-sur-Yvette France Departmento de Fisica Teorica and IFT-UAM/CSIC Universidad Autónoma de Madrid Madrid Spain IPHC IN2P3/CNRS Université de Strasbourg 67037 Strasbourg France Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki 567-0047 Japan Department of Physics Osaka City University Osaka 558-8585 Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Center for Nuclear Study University of Tokyo RIKEN campus Wako Saitama 351-0198 Japan Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan Department of Physics Rikkyo University 3-34-1 Nishi-Ikebukuro Toshima Tokyo 172-8501 Japan Institut für Kernphysik Technische Universität Darmstadt 64289 Darmstadt Germany School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4GJ United Kingdom Institute for Nuclear Science & Technology VINATOM P.O. Box 5T-160 Nghia Do Hanoi Vietnam MTA Atomki P.O. Box 51 Debrecen H-4001 Hungary Institut de Physique Nucléaire d'Orsay IN2P3-CNRS F-91406 Orsay Cedex France Department of Physics University of Oslo N-0316 Oslo Norway CSNSM IN2P3/CNRS Université Paris-Saclay 91405 Orsay Campus France Department of Physics University of Surrey Guildford GU2 7XH United Kingdom Department of Physics Tohoku University Sendai 980-8578 Japan State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 People's Republic of China

The structures of the neutron-rich Co69,71,73 isotopes were investigated via (p,2p) knockout reactions at the Radioactive Isotope Beam Factory, RIKEN. Isotopes of interest were studied using the DALI2 γ-ray detector array combined with the MINOS target and tracker system. Level schemes were reconstructed using the γ−γ coincidence technique, with tentative spin-parity assignments based on the measured inclusive and exclusive cross sections. Comparison with shell-model calculations using the Lenzi-Nowacki-Poves-Sieja LNPS and PFSDG-U interactions suggests coexistence of spherical and deformed shapes at low excitation energies in the Co69,71,73 isotopes. The distorted-wave impulse approximation (DWIA) framework was used to calculate the single-particle cross sections. These values were compared with the experimental findings.

关键词： Direct reactions Nuclear reactions Nuclear structure & decays Shell model 59 ≤ A ≤ 89 Radioactive beams

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Nuclear structure of Ni76 from the (p,2p) reaction

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Physical Review C 2019年第1期99卷 014312-014312页

作者： Z. Elekes Á. Kripkó D. Sohler K. Sieja K. Ogata K. Yoshida P. Doornenbal A. Obertelli G. Authelet H. Baba D. Calvet F. Château A. Corsi A. Delbart J.-M. Gheller A. Gillibert T. Isobe V. Lapoux M. Matsushita S. Momiyama T. Motobayashi H. Otsu C. Péron A. Peyaud E. C. Pollacco J.-Y. Roussé H. Sakurai C. Santamaria Y. Shiga S. Takeuchi R. Taniuchi T. Uesaka H. Wang K. Yoneda F. Browne L. X. Chung Zs. Dombrádi F. Flavigny S. Franchoo F. Giacoppo A. Gottardo K. Hadyńska-Klęk Z. Korkulu S. Koyama Y. Kubota J. Lee M. Lettmann C. Louchart R. Lozeva K. Matsui T. Miyazaki M. Niikura S. Nishimura L. Olivier S. Ota Z. Patel E. Sahin C. Shand P.-A. Söderström I. Stefan D. Steppenbeck T. Sumikama D. Suzuki Zs. Vajta V. Werner J. Wu Z. Xu MTA Atomki P.O. Box 51 H-4001 Debrecen Hungary CNRS UMR 7178 F-67037 Strasbourg France Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki 567-0047 Japan Department of Physics Osaka City University Osaka 558-8585 Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan Institut für Kernphysik Technische Universität Darmstadt 64289 Darmstadt Germany IRFU CEA Université Paris-Saclay F-91191 Gif-sur-Yvette France Center for Nuclear Study University of Tokyo RIKEN Campus Wako Saitama 351-0198 Japan Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics Rikkyo University 3-34-1 Nishi-Ikebukuro Toshima Tokyo 172-8501 Japan School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4GJ United Kingdom Institute for Nuclear Science & Technology VINATOM P.O. Box 5T-160 Nghia Do Hanoi Vietnam Institut de Physique Nucléaire IN2P3-CNRS Université Paris-Sud Université Paris-Saclay 91406 Orsay Cedex France Department of Physics University of Oslo N-0316 Oslo Norway Department of Physics The University of Hong Kong Pokfulam Hong Kong Université de Strasbourg IPHC 23 rue du Loess F-67037 Strasbourg France CSNSM CNRS/IN2P3 Université Paris-Saclay F-91405 Orsay Campus France Department of Physics University of Surrey Guildford GU2 7XH United Kingdom Department of Physics Tohoku University Sendai 980-8578 Japan State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 People's Republic of China

The nuclear structure of the Ni76 nucleus was investigated by (p,2p) reaction using a NaI(Tl) array to detect the deexciting prompt γ rays. A new transition with an energy of 2227 keV was identified by γγ and γγγ coincidences. According to these coincidence spectra the observed transition connects a new state at 4147 keV and the previously known 41+ state at 1920 keV. Two weaker transitions were also obtained at 2441 and 2838 keV, which could be tentatively placed to feed the known 21+ state at 990 keV. Our shell-model calculations using the Lenzi, Nowacki, Poves, and Sieja interaction produced good candidates for the experimental proton hole states in the observed energy region, and the theoretical cross sections showed good agreement with the experimental values. Although we could not assign all the experimental states to the theoretical ones unambiguously, the results are consistent with a reasonably large Z=28 shell gap for nickel isotopes in accordance with previous studies.

关键词： Electromagnetic transitions Energy levels & level densities Nuclear spin & parity Nuclear structure & decays Shell model Spectroscopic factors & electromagnetic moments 59 ≤ A ≤ 89

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γ-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich Kr94,95,96

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Physical Review C 2022年第2期105卷 024302-024302页

作者： R.-B. Gerst A. Blazhev K. Moschner P. Doornenbal A. Obertelli K. Nomura J.-P. Ebran S. Hilaire J. Libert 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 F. Browne A. M. Bruce R. Caroll L. X. Chung M. L. Cortés M. Dewald B. Ding F. Flavigny S. Franchoo M. Górska A. Gottardo J. Jolie A. Jungclaus J. Lee M. Lettmann B. D. Linh J. Liu Z. Liu C. Lizarazo S. Momiyama S. Nagamine N. Nakatsuka C. R. Nita C. Nobs L. Olivier R. Orlandi Z. Patel Zs. Podolyák M. Rudigier T. Saito C. Shand P.-A. Söderström I. Stefan V. Vaquero V. Werner K. Wimmer Z. Xu Institut für Kernphysik Universität zu Köln 50937 Köln Germany RIKEN Nishina Center Wako Saitama 351-0198 Japan IRFU CEA Université Paris-Saclay 91191 Gif-sur-Yvette France Department of Physics Faculty of Science University of Zagreb HR-10000 Zagreb Croatia CEA DAM DIF F-91297 Arpajon France Laboratoire Matière en Conditions Extrêmes CEA Université Paris-Saclay 91680 Bruyères-le-Châtel France School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Kastler Brossel Sorbonne Université CNRS ENS-PSL Research University Collège de France Case 74 4 Place Jussieu F-75005 Paris France GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 Darmstadt 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 Technique VINATOM 179 Hoang Quoc Viet Road Cau Giay Hanoi Vietnam Institut für Kernphysik Technische Universität Darmstadt 64289 Darmstadt Germany Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Institut de Physique Nucléaire CNRS-IN2P3 Université Paris-Saclay 91406 Orsay Cedex France LPC Caen CNRS/IN2P3 Normandie Université ENSICAEN UNICAEN 14000 Caen France Instituto de Estructura de la Materia CSIC 28006 Madrid Spain Department of Physics The University of Hong Kong Pokfulam 999077 Hong Kong China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Faculty of Science Kyoto University Kyoto 606-8502 Japan Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH) R-077125 Bucharest Romania Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan

We report on γ-ray spectroscopy of low-lying excited states in the neutron-rich Kr94,95,96 isotopes measured as part of the “Shell Evolution And Search for Two-plus energies At RIBF” (SEASTAR) campaign at the RIKEN Radioactive Isotope Beam Factory. Excited yrast and non-yrast states were observed, and half-lives extracted via geant4 simulations. In Kr94,96 candidates for the 31− state were identified. For Kr95, the prompt SEASTAR data were combined with delayed spectroscopic data measured with the EURICA array to observe transitions on top of the known (7/2)+ isomer at a level energy of 195.5(3) keV. The comparison of the new experimental results with five-dimensional collective Hamiltonian (5DCH) and mapped interacting boson model (IBM) calculations, both using the Gogny D1M interaction, could suggest oblate-prolate shape coexistence already in Kr96.

关键词： Electromagnetic transitions Isomer decays Nuclear structure & decays 90 ≤ A ≤ 149

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Sequential Nature of (p,3p) Two-Proton Knockout from Neutron-Rich Nuclei

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Physical Review Letters 2020年第1期125卷 012501-012501页

作者： A. Frotscher M. Gómez-Ramos A. Obertelli P. Doornenbal G. Authelet H. Baba D. Calvet F. Château S. Chen A. Corsi A. Delbart J.-M. Gheller A. Giganon A. Gillibert T. Isobe V. Lapoux M. Matsushita S. Momiyama T. Motobayashi M. Niikura H. Otsu N. Paul C. Péron A. Peyaud E. C. Pollacco J.-Y. Roussé H. Sakurai C. Santamaria M. Sasano Y. Shiga N. Shimizu D. Steppenbeck S. Takeuchi R. Taniuchi T. Uesaka H. Wang K. Yoneda T. Ando T. Arici A. Blazhev F. Browne A. M. Bruce R. Carroll L. X. Chung M. L. Cortés M. Dewald B. Ding Zs. Dombradi F. Flavigny S. Franchoo F. Giacoppo M. Górska A. Gottardo K. Hadyńska-Klęk Z. Korkulu S. Koyama Y. Kubota A. Jungclaus J. Lee M. Lettmann B. D. Linh J. Liu Z. Liu C. Lizarazo C. Louchart R. Lozeva K. Matsui T. Miyazaki K. Moschner S. Nagamine N. Nakatsuka C. Nita S. Nishimura C. R. Nobs L. Olivier S. Ota Z. Patel Zs. Podolyák M. Rudigier E. Sahin T. Y. Saito C. Shand P.-A. Söderström I. G. Stefan T. Sumikama D. Suzuki R. Orlandi V. Vaquero Zs. Vajta V. Werner K. Wimmer J. Wu Z. Xu Institut für Kernphysik Technische Universität Darmstadt D-64289 Darmstadt Germany IRFU CEA Université Paris-Saclay F-91191 Gif-sur-Yvette France RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 People’s Republic of China Center for Nuclear Study The University of Tokyo RIKEN campus Wako Saitama 351-0198 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics Rikkyo University 3-34-1 Nishi-Ikebukuro Toshima Tokyo 172-8501 Japan Center for Nuclear Study The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan GSI Helmholtzzentrum für Schwerionenforschung GmbH D-64291 Darmstadt Germany Justus-Liebig-Universität Giessen D-35392 Giessen Germany Institut für Kernphysik Universität zu Köln D-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 & 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 MTA Atomki P.O. Box 51 Debrecen H-4001 Hungary Present affiliation: LPC Caen ENSICAEN Université de Caen CNRS/IN2P3 14050 Caen Cedex 04 France Department of Physics University of Oslo N-0316 Oslo Norway Instituto de Estructura de la Materia CSIC 28006 Madrid Spain Department of Physics The University of Hong Kong Pokfulam Hong Kong School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China IPHC CNRS/IN2P3 Université de Strasbourg F-67037 Strasbourg France CSNSM CNRS/IN2P3 Université Paris-Sud F-91405 Orsay Campus France Department of Physics Faculty of Science Kyoto University Kyoto 606-8502 Japan Horia Hulubei National Institute of Physic

Twenty-one two-proton knockout (p,3p) cross sections were measured from neutron-rich nuclei at ∼250 MeV/nucleon in inverse kinematics. The angular distribution of the three emitted protons was determined for the first time, demonstrating that the (p,3p) kinematics are consistent with two sequential proton-proton collisions within the projectile nucleus. Ratios of (p,3p) over (p,2p) inclusive cross sections follow the trend of other many-nucleon removal reactions, further reinforcing the sequential nature of (p,3p) in neutron-rich nuclei.

关键词： Direct reactions Rare & new isotopes

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