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Axial shape asymmetry and high-spin states in nuclei with Z=100 suggested by the projected total energy surface approach

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Physical Review C 2021年第1期104卷 014306-014306页

作者： Tu Ya (图雅) Yong-Jing Chen (陈永静) Yong-Shou Chen (陈永寿) Zao-Chun Gao (高早春) Ling Liu (刘玲) School of Physics Science and Technology Shenyang Normal University ShenYang 110034 China China Nuclear Data Center China Institute of Atomic Energy Beijing 102413 China China Institute of Atomic Energy Beijing 102413 China State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

The axial-shape asymmetry of yrast states in Fm246–256 is studied by performing the projected total-energy surface (PTES) calculations, which consider the beyond-mean-field effects associated with the restoration of rotational symmetry and shape variation at the same time. The results show a large elongation deformation but also a considerable large triaxiality for their ground and high spin states, the triaxial deformation γ≈11∘ in average. In comparison, the TRS calculations have also been performed for these nuclei, and the results show a well-established axial quadrupole shape in their ground states. The presence of the significant triaxial deformation can be attributed to the beyond-mean-field effects generated by the angular-momentum projection. The axial asymmetric shape for the yrast states of nuclei with Z=100, suggested by the present variation after projection (VAP) calculations, indicates that the triaxial degree of freedom may also play a significant role in other transfermium and even superheavy nuclei. The present PTES calculations have well reproduced the available experimental energies of the ground-band states and predict the rest yrast states up to spin 30 in each nucleus. The calculated yrast bands of Fm246–256 present the back bending phenomenon at about the state 18+, caused by the alignment excitations of the two quasiparticle neutrons of νj15/2[743]7/2 or of νh11/2[761]1/2. It is worth confirming the predicted band structures by the future spectroscopic experiments in the transfermium nuclei for the study of the single-particle structure in the superheavy mass region.

关键词： nuclear structure & decays Nucleon distribution A ≥ 220

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Search for Majorana Neutrinos with the Complete KamLAND-Zen dataset

arXiv

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arXiv 2024年

作者： Abe, S. Araki, T. Chiba, K. Eda, T. Eizuka, M. Funahashi, Y. Furuto, A. Gando, A. Gando, Y. Goto, S. Hachiya, T. Hata, K. Ichimura, K. Ieki, S. Ikeda, H. Inoue, K. Ishidoshiro, K. Kamei, Y. Kawada, N. Kishimoto, Y. Koga, M. Marthe, A. Matsumoto, Y. Mitsui, T. Miyake, Haruhiko Morita, D. Nakamura, K. Nakamura, R. Nakamura, R. Nakane, J. Ono, T. Ozaki, H. Saito, K. Sakai, T. Shimizu, I. Shirai, J. Shiraishi, K. Suzuki, A. Tachibana, K. Tamae, K. Watanabe, H. Watanabe, K. Yoshida, S. Umehara, S. Fushimi, K. Kotera, K. Urano, Y. Berger, B.E. Fujikawa, B.K. Learned, J.G. Maricic, J. Fu, Z. Ghosh, S. Smolsky, J. Winslow, L.A. Efremenko, Y. Karwowski, H.J. Markoff, D.M. Tornow, W. Dell'Oro, S. Donnell, T.O. Detwiler, J.A. Enomoto, S. Decowski, M.P. Weerman, K.M. Grant, C. Penek, O. Song, H. Li, A. Axani, S.N. Garcia, M. Sarfraz, M. Research Center for Neutrino Science Tohoku University Sendai980-8578 Japan Department of Human Science Obihiro University of Agriculture and Veterinary Medicine Hokkaido Obihiro080-8555 Japan The University of Tokyo Institutes for Advanced Study The University of Tokyo Chiba Kashiwa277-8583 Japan Graduate Program on Physics for the Universe Tohoku University Sendai980-8578 Japan Graduate School of Science Osaka University Toyonaka Osaka560-0043 Japan Research Center for Nuclear Physics Osaka University Osaka Ibaraki567-0047 Japan Department of Physics Tokushima University Tokushima770-8506 Japan Graduate School of Integrated Arts and Sciences Tokushima University Tokushima770-8502 Japan Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics and Astronomy University of Hawaii at Manoa HonoluluHI96822 United States Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Triangle Universities Nuclear Laboratory DurhamNC27708 United States Physics Departments Duke University DurhamNC27708 United States North Carolina Central University DurhamNC27707 United States The University of North Carolina at Chapel Hill Chapel HillNC27599 United States Center for Neutrino Physics Virginia Polytechnic Institute State University BlacksburgVA24061 United States Center for Experimental Nuclear Physics and Astrophysics University of Washington SeattleWA98195 United States Nikhef The University of Amsterdam Science Park Amsterdam Netherlands Boston University BostonMA02215 United States Halıcıoglu Data Science Institute Department of Physics University of California San Diego La Jolla CA92093 United States Department of Physics and Astronomy University of Delaware NewarkDE19716 United States

We present a search for neutrinoless double-beta (0νββ) decay of 136Xe using the full KamLAND-Zen 800 dataset with 745 kg of enriched xenon, corresponding to an exposure of 2.097 ton yr of 136Xe. This updated search benefits from a more than twofold increase in exposure, recovery of photo-sensor gain, and reduced background from muon-induced spallation of xenon. Combining with the search in the previous KamLAND-Zen phase, we obtain a lower limit for the 0νββ decay half-life of T1/20ν > 3.8 × 1026 yr at 90% C.L., a factor of 1.7 improvement over the previous limit. The corresponding upper limits on the effective Majorana neutrino mass are in the range 28–122 meV using phenomenological nuclear matrix element calculations. © 2024, CC BY.

关键词： Xenon

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Final results on the decay half-life limit of Mo from the CUPID-Mo experiment

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The European Physical Journal C 2022年第11期82卷 1-20页

作者： Augier, C. Barabash, A. S. Bellini, F. Benato, G. Beretta, M. Bergé, L. Billard, J. Borovlev, Yu. A. Cardani, L. Casali, N. Cazes, A. Chapellier, M. Chiesa, D. Dafinei, I. Danevich, F. A. De Jesus, M. de Marcillac, P. Dixon, T. Dumoulin, L. Eitel, K. Ferri, F. Fujikawa, B. K. Gascon, J. Gironi, L. Giuliani, A. Grigorieva, V. D. Gros, M. Helis, D. L. Huang, H. Z. Huang, R. Imbert, L. Johnston, J. Juillard, A. Khalife, H. Kleifges, M. Kobychev, V. V. Kolomensky, Yu. G. Konovalov, S. I. Loaiza, P. Ma, L. Makarov, E. P. Mariam, R. Marini, L. Marnieros, S. Navick, X.-F. Nones, C. Norman, E. B. Olivieri, E. Ouellet, J. L. Pagnanini, L. Pattavina, L. Paul, B. Pavan, M. Peng, H. Pessina, G. Pirro, S. Poda, D. V. Polischuk, O. G. Pozzi, S. Previtali, E. Redon, Th. Rojas, A. Rozov, S. Sanglard, V. Scarpaci, J. A. Schmidt, B. Shen, Y. Shlegel, V. N. Singh, V. Tomei, C. Tretyak, V. I. Umatov, V. I. Vagneron, L. Velázquez, M. Welliver, B. Winslow, L. Xue, M. Yakushev, E. Zarytskyy, M. Zolotarova, A. S. Univ Lyon Université Lyon 1 CNRS/IN2P3 IP2I-Lyon Villeurbanne France National Research Centre Kurchatov Institute Institute of Theoretical and Experimental Physics Moscow Russia Dipartimento di Fisica Sapienza Università di Roma Rome Italy INFN Sezione di Roma Rome Italy IRFU CEA Université Paris-Saclay Gif-sur-Yvette France INFN Laboratori Nazionali del Gran Sasso Assergi Italy Department of Physics University of California Berkeley USA Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France Nikolaev Institute of Inorganic Chemistry Novosibirsk Russia Dipartimento di Fisica Università di Milano-Bicocca Milan Italy INFN Sezione di Milano-Bicocca Milan Italy Institute for Nuclear Research Kyiv Ukraine Institute for Astroparticle Physics Karlsruhe Institute of Technology Karlsruhe Germany Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley USA Gran Sasso Science Institute L’Aquila Italy Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Fudan University Shanghai People’s Republic of China Massachusetts Institute of Technology Cambridge USA Institute for Data Processing and Electronics Karlsruhe Institute of Technology Karlsruhe Germany Department of Nuclear Engineering University of California Berkeley USA Physik Department Technische Universität München Garching Germany Department of Modern Physics University of Science and Technology of China Hefei People’s Republic of China LSM Laboratoire Souterrain de Modane Modane France Laboratory of Nuclear Problems JINR Dubna Russia Department of Physics and Astronomy Northwestern University Evanston USA Université Grenoble Alpes CNRS Grenoble INP SIMAP Saint Martin d’Héres France

The CUPID-Mo experiment to search for 0 $$\nu \beta \beta $$ decay in $$^{100}$$ Mo has been recently completed after about 1.5 years of operation at Laboratoire Souterrain de Modane (France). It served as a demonstrator for CUPID, a next generation 0 $$\nu \beta \beta $$ decay experiment. CUPID-Mo was comprised of 20 enriched $$\hbox {Li}_{{2}}$$ $$^{100}$$ $$\hbox {MoO}_4$$ scintillating calorimeters, each with a mass of $$\sim 0.2$$ kg, operated at $$\sim 20$$ mK. We present here the final analysis with the full exposure of CUPID-Mo ( $$^{100}$$ Mo exposure of 1.47 $$\hbox {kg} \times \hbox {year}$$ ) used to search for lepton number violation via 0 $$\nu \beta \beta $$ decay. We report on various analysis improvements since the previous result on a subset of data, reprocessing all data with these new techniques. We observe zero events in the region of interest and set a new limit on the $$^{100}$$ Mo 0 $$\nu \beta \beta $$ decay half-life of $$T_{1/2}^{0\nu }$$ $$> {1.8}\times 10^{24}$$ year (stat. + syst.) at 90% CI. Under the light Majorana neutrino exchange mechanism this corresponds to an effective Majorana neutrino mass of $$\left$$ $$<~{(0.28{-}0.49)} $$ eV, dependent upon the nuclear matrix element utilized.

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Search for Lorentz-invariance violation with the first KATRIN data

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Physical Review D 2023年第8期107卷 082005-082005页

作者： M. Aker D. Batzler A. Beglarian J. Behrens A. Berlev U. Besserer B. Bieringer F. Block S. Bobien B. Bornschein L. Bornschein M. Böttcher T. Brunst T. S. Caldwell R. M. D. Carney S. Chilingaryan W. Choi K. Debowski M. Descher D. Díaz Barrero P. J. Doe O. Dragoun G. Drexlin F. Edzards K. Eitel E. Ellinger R. Engel S. Enomoto A. Felden J. A. Formaggio F. M. Fränkle G. B. Franklin F. Friedel A. Fulst K. Gauda A. S. Gavin W. Gil F. Glück R. Grössle R. Gumbsheimer V. Hannen N. Haußmann K. Helbing S. Hickford R. Hiller D. Hillesheimer D. Hinz T. Höhn T. Houdy A. Huber A. Jansen C. Karl J. Kellerer M. Kleifges M. Klein C. Köhler L. Köllenberger A. Kopmann M. Korzeczek A. Kovalík B. Krasch H. Krause L. La Cascio T. Lasserre T. L. Le O. Lebeda B. Lehnert A. Lokhov M. Machatschek E. Malcherek M. Mark A. Marsteller E. L. Martin C. Melzer S. Mertens J. Mostafa K. Müller H. Neumann S. Niemes P. Oelpmann D. S. Parno A. W. P. Poon J. M. L. Poyato F. Priester J. Ráliš S. Ramachandran R. G. H. Robertson W. Rodejohann C. Rodenbeck M. Röllig C. Röttele M. Ryšavý R. Sack A. Saenz R. Salomon P. Schäfer L. Schimpf M. Schlösser K. Schlösser L. Schlüter S. Schneidewind M. Schrank A. Schwemmer M. Šefčík V. Sibille D. Siegmann M. Slezák F. Spanier M. Steidl M. Sturm H. H. Telle L. A. Thorne T. Thümmler N. Titov I. Tkachev K. Urban K. Valerius D. Vénos A. P. Vizcaya Hernández C. Weinheimer S. Welte J. Wendel M. Wetter J. Wickles C. Wiesinger J. F. Wilkerson J. Wolf S. Wüstling J. Wydra W. Xu S. Zadoroghny G. Zeller Institute for Astroparticle Physics (IAP) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany Institute for Data Processing and Electronics (IPE) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany Institute for Nuclear Research of Russian Academy of Sciences 60th October Anniversary Prospect 7a 117312 Moscow Russia Institute for Nuclear Physics University of Münster Wilhelm-Klemm-Str. 9 48149 Münster Germany Institute of Experimental Particle Physics (ETP) Karlsruhe Institute of Technology (KIT) Wolfgang-Gaede-Str. 1 76131 Karlsruhe Germany Institute for Technical Physics (ITEP) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany Technische Universität München James-Franck-Str. 1 85748 Garching Germany Max-Planck-Institut für Physik Föhringer Ring 6 80805 München Germany Department of Physics and Astronomy University of North Carolina Chapel Hill North Carolina 27599 USA Triangle Universities Nuclear Laboratory Durham North Carolina 27708 USA Institute for Nuclear and Particle Astrophysics and Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Faculty of Mathematics and Natural Sciences University of Wuppertal Gaußtraße 20 42119 Wuppertal Germany Departamento de Química Física Aplicada Universidad Autonoma de Madrid Campus de Cantoblanco 28049 Madrid Spain Center for Experimental Nuclear Physics and Astrophysics and Department of Physics University of Washington Seattle Washington 98195 USA Nuclear Physics Institute Czech Academy of Sciences 25068 Řež Czech Republic Laboratory for Nuclear Science Massachusetts Institute of Technology 77 Massachusetts Ave Cambridge Massachusetts 02139 USA Department of Physics Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA IRFU (DPhP & APC) CEA Université Paris-Saclay

Some extensions of the Standard Model of particle physics allow for Lorentz invariance and charge-parity-time invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. In this work, we focus on the parameters (aof(3))00, (aof(3))10, and (aof(3))11 which would manifest themselves in a nonisotropic β-decaying source as a sidereal oscillation and an overall shift of the spectral endpoint. Based on the data of the first scientific run of the KATRIN experiment, we set the first 90% confidence-level limit on |(aof(3))11| of <0.9×10−6 GeV to 3.7×10−6 GeV, depending on the phase. Moreover, we derive new constraints on (aof(3))00 and (aof(3))10.

关键词： Particle astrophysics Neutrinos Lorentz symmetry Particle properties Spectroscopy

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Corrigendum to “Properties and thermal neutron areal transmittance of a B 4 C filled thermoplastic elastomer based rubber composite” [Nucl. Mater. Energy 31 (2022) 101193]

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nuclear Materials and Energy 2022年 32卷

作者： Boyu Wang Tianyi Qiu Jinnan Yin Menghuai Wang Shixin Ma Qi Wang Lin Yuan Qinglong Fang Guoqing Zhang Yang Liu School of Science Xi’an Polytechnic University Xi’an 710600 Shaanxi China Xi’an Key Laboratory of Nuclear Protection Textile Equipment Technology Xi’an 710600 Shaanxi China Engineering Research Center of Flexible Radiation Protection Technology Universities of Shannxi Province Xi’an 710600 Shaanxi China School of National Defense Science and Technology Southwest University of Science and Technology Mianyang 621010 Sichuan China Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing 102413 China

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New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN data Runs

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Physical Review Letters 2022年第1期129卷 011806-011806页

作者： M. Aker D. Batzler A. Beglarian J. Behrens A. Berlev U. Besserer B. Bieringer F. Block S. Bobien B. Bornschein L. Bornschein M. Böttcher T. Brunst T. S. Caldwell R. M. D. Carney S. Chilingaryan W. Choi K. Debowski M. Descher D. Díaz Barrero P. J. Doe O. Dragoun G. Drexlin F. Edzards K. Eitel E. Ellinger R. Engel S. Enomoto A. Felden J. A. Formaggio F. M. Fränkle G. B. Franklin F. Friedel A. Fulst K. Gauda A. S. Gavin W. Gil F. Glück R. Grössle R. Gumbsheimer V. Hannen N. Haußmann K. Helbing S. Hickford R. Hiller D. Hillesheimer D. Hinz T. Höhn T. Houdy A. Huber A. Jansen C. Karl F. Kellerer J. Kellerer M. Kleifges M. Klein C. Köhler L. Köllenberger A. Kopmann M. Korzeczek A. Kovalík B. Krasch H. Krause L. La Cascio T. Lasserre T. L. Le O. Lebeda B. Lehnert A. Lokhov M. Machatschek E. Malcherek M. Mark A. Marsteller E. L. Martin C. Melzer S. Mertens J. Mostafa K. Müller H. Neumann S. Niemes P. Oelpmann D. S. Parno A. W. P. Poon J. M. L. Poyato F. Priester J. Ráliš S. Ramachandran R. G. H. Robertson W. Rodejohann C. Rodenbeck M. Röllig C. Röttele M. Ryšavý R. Sack A. Saenz R. Salomon P. Schäfer L. Schimpf M. Schlösser K. Schlösser L. Schlüter S. Schneidewind M. Schrank A. Schwemmer M. Šefčík V. Sibille D. Siegmann M. Slezák F. Spanier M. Steidl M. Sturm H. H. Telle L. A. Thorne T. Thümmler N. Titov I. Tkachev K. Urban K. Valerius D. Vénos A. P. Vizcaya Hernández C. Weinheimer S. Welte J. Wendel C. Wiesinger J. F. Wilkerson J. Wolf S. Wüstling J. Wydra W. Xu S. Zadoroghny G. Zeller Tritium Laboratory Karlsruhe (TLK) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany Institute for Data Processing and Electronics (IPE) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany Institute for Astroparticle Physics (IAP) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany Institute for Nuclear Research of Russian Academy of Sciences 60th October Anniversary Prospect 7a 117312 Moscow Russia Institute for Nuclear Physics University of Münster Wilhelm-Klemm-Strasse 9 48149 Münster Germany Institute of Experimental Particle Physics (ETP) Karlsruhe Institute of Technology (KIT) Wolfgang-Gaede-Strasse 1 76131 Karlsruhe Germany Institute for Technical Physics (ITEP) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany Technische Universität München James-Franck-Strasse 1 85748 Garching Germany Max-Planck-Institut für Physik Föhringer Ring 6 80805 München Germany Department of Physics and Astronomy University of North Carolina Chapel Hill North Carolina 27599 USA Triangle Universities Nuclear Laboratory Durham North Carolina 27708 USA Institute for Nuclear and Particle Astrophysics and Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Faculty of Mathematics and Natural Sciences University of Wuppertal Gaußstr. 20 42119 Wuppertal Germany Departamento de Química Física Aplicada Universidad Autonoma de Madrid Campus de Cantoblanco 28049 Madrid Spain Center for Experimental Nuclear Physics and Astrophysics and Dept. of Physics University of Washington Seattle Washington 98195 USA Nuclear Physics Institute Czech Academy of Sciences 25068 Řež Czech Republic Laboratory for Nuclear Science Massachusetts Institute of Technology 77 Massachusetts Ave Cambridge Massachus

We report on the direct search for cosmic relic neutrinos using data acquired during the first two science campaigns of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the end point at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity ratio of η<9.7×1010/α (1.1×1011/α) at a 90% (95%) confidence level with α=1 (0.5) for Majorana (Dirac) neutrinos. A fit of the integrated electron spectrum over a narrow interval around the end point accounting for relic neutrino captures in the tritium source reveals no significant overdensity. This work improves the results obtained by the previous neutrino mass experiments at Los Alamos and Troitsk. We furthermore update the projected final sensitivity of the KATRIN experiment to η<1×1010/α at 90% confidence level, by relying on updated operational conditions.

关键词： Cosmic ray & astroparticle detectors Cosmology Evolution of the Universe Extrasolar neutrino astronomy Nucleus-neutrino interactions Particle interactions Neutrinos Neutrino detectors

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The FAST Galactic Plane Pulsar Snapshot survey: IV. Discovery of five fast radio bursts

arXiv

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arXiv 2023年

作者： Zhou, D.J. Han, J.L. Jing, W.C. Wang, P.F. Wang, C. Wang, T. Wang, W.-Y. Luo, R. Xu, J. Xu, R.X. Wang, H.G. National Astronomical Observatories Chinese Academy of Sciences Jia-20 Datun Road ChaoYang District Beijing100101 China School of Astronomy University of Chinese Academy of Sciences Beijing100049 China CAS Key Laboratory of FAST NAOC Chinese Academy of Sciences Beijing100101 China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China Kavli Institute for Astronomy and Astrophysics Peking University Beijing100871 China CSIRO Space and Astronomy PO Box 76 EppingNSW1710 Australia Department of Astronomy School of Physics and Materials Science Guangzhou University Guangzhou510006 China Department of Astronomy Peking University Beijing100871 China National Astronomical Data Center Great Bay Area Guangzhou510006 China

We report five new fast radio bursts (FRBs) discovered from the Galactic Plane Pulsar Snapshot (GPPS) survey by the Five-hundred-meter Aperture Spherical radio Telescope (FAST): FRB 20210126, FRB 20210208, FRB 20210705, FRB 20211005 and FRB 20220306. To date, no repeating bursts from these FRB sources have been detected in the follow-up monitoring observations, leading to their classification as potential one-off events. We obtain the basic parameters for these bursts, including position, dispersion measure (DM), pulse width, spectral index, scattering time-scale, etc. The fluences and flux densities are generally lower in comparison to the values observed in one-off bursts discovered by other telescopes. Among the observed bursts, polarization data for 4 bursts were recorded during observations. Consequently, we obtain polarization profiles and Faraday rotation measures (RMs) for these bursts. Copyright © 2023, The Authors. All rights reserved.

关键词： Pulsars

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Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB

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Physical Review Letters 2023年第24期130卷 242501-242501页

作者： T. J. Gray J. M. Allmond Z. Xu T. T. King R. S. Lubna H. L. Crawford V. Tripathi B. P. Crider R. Grzywacz S. N. Liddick A. O. Macchiavelli T. Miyagi A. Poves A. Andalib E. Argo C. Benetti S. Bhattacharya C. M. Campbell M. P. Carpenter J. Chan A. Chester J. Christie B. R. Clark I. Cox A. A. Doetsch J. Dopfer J. G. Duarte P. Fallon A. Frotscher T. Gaballah J. T. Harke J. Heideman H. Huegen J. D. Holt R. Jain N. Kitamura K. Kolos F. G. Kondev A. Laminack B. Longfellow S. Luitel M. Madurga R. Mahajan M. J. Mogannam C. Morse S. Neupane A. Nowicki T. H. Ogunbeku W.-J. Ong C. Porzio C. J. Prokop B. C. Rasco E. K. Ronning E. Rubino T. J. Ruland K. P. Rykaczewski L. Schaedig D. Seweryniak K. Siegl M. Singh A. E. Stuchbery S. L. Tabor T. L. Tang T. Wheeler J. A. Winger J. L. Wood Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37966 USA Facility for Rare Isotope Beams Michigan State University East Lansing Michigan 48824 USA Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Florida State University Tallahassee Florida 32306 USA Department of Physics and Astronomy Mississippi State University Mississippi State Mississippi 39762 USA Department of Chemistry Michigan State University East Lansing Michigan 48824 USA Department of Physics Technische Universität Darmstadt Darmstadt Germany ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH 64291 Darmstadt Germany Departamento de Fìsica Teórica and IFT-UAM/CSIC Universidad Autónoma de Madrid E-28049 Madrid Spain Department of Physics and Astronomy Michigan State University East Lansing Michigan 48824 USA Argonne National Laboratory Argonne Illinois 60439 USA Lawrence Livermore National Laboratory Livermore California 94550 USA TRIUMF 4004 Wesbrook Mall Vancouver British Columbia V6T 2A3 Canada Department of Physics McGill University Montréal Quebec City H3A 2T8 Canada National Nuclear Data Center Brookhaven National Laboratory Upton New York 11973 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics and Astronomy Louisiana State University Baton Rouge Louisiana 70803 USA Department of Nuclear Physics and Accelerator Applications Research School of Physics Australian National University Canberra Australian Capital Territory 2601 Australia School of Physics Georgia Institute of Technology Atlanta Georgia 30332-0430 USA

Excited-state spectroscopy from the first experiment at the Facility for Rare Isotope Beams (FRIB) is reported. A 24(2)−μs isomer was observed with the FRIB Decay Station initiator (FDSi) through a cascade of 224- and 401-keV γ rays in coincidence with Na32 nuclei. This is the only known microsecond isomer (1 μs≤T1/2<1 ms) in the region. This nucleus is at the heart of the N=20 island of shape inversion and is at the crossroads of the spherical shell-model, deformed shell-model, and ab initio theories. It can be represented as the coupling of a proton hole and neutron particle to Mg32, Mg32+π−1+ν+1. This odd-odd coupling and isomer formation provides a sensitive measure of the underlying shape degrees of freedom of Mg32, where the onset of spherical-to-deformed shape inversion begins with a low-lying deformed 2+ state at 885 keV and a low-lying shape-coexisting 02+ state at 1058 keV. We suggest two possible explanations for the 625-keV isomer in Na32: a 6− spherical shape isomer that decays by E2 or a 0+ deformed spin isomer that decays by M2. The present results and calculations are most consistent with the latter, indicating that the low-lying states are dominated by deformation.

关键词： Collective levels Collective models Electromagnetic transitions Isomer decays Lifetimes & widths nuclear spin & parity Shell model

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AutoPET Challenge: Combining nn-Unet with Swin UNETR Augmented by Maximum Intensity Projection Classifier

arXiv

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arXiv 2022年

作者： Heiliger, Lars Marinov, Zdravko Hasin, Max Ferreira, André Fragemann, Jana Pomykala, Kelsey Murray, Jacob Kersting, David Alves, Victor Stiefelhagen, Rainer Egger, Jan Kleesiek, Jens Institute for Ai in Medicine University Hospital Essen Essen Germany University Medicine Essen Essen Germany Institute for Anthropomatics and Robotics Karlsruhe Institute of Technology Karlsruhe Germany Center Algoritmi University of Minho Braga Portugal Computer Algorithms for Medicine Laboratory Graz Austria Department of Nuclear Medicine University Hospital Essen Essen Germany Essen Germany West German Cancer Center Essen Germany HIDSS4Health - Helmholtz Information Data Science School for Health Heidelberg Karlsruhe Germany

Tumor volume and changes in tumor characteristics over time are important biomarkers for cancer therapy. In this context, FDGPET/CT scans are routinely used for staging and re-staging of cancer, as the radiolabeled fluorodeoxyglucose is taken up in regions of high metabolism. Unfortunately, these regions with high metabolism are not specific to tumors and can also represent physiological uptake by normal functioning organs, inflammation, or infection, making detailed and reliable tumor segmentation in these scans a demanding task. This gap in research is addressed by the AutoPET challenge, which provides a public data set with FDG-PET/CT scans from 900 patients to encourage further improvement in this field. Our contribution to this challenge is an ensemble of two state-of-the-art segmentation models, the nn-Unet and the Swin UNETR, augmented by a maximum intensity projection classifier that acts like a gating mechanism. If it predicts the existence of lesions, both segmentations are combined by a late fusion approach. Our solution achieves an average Cross Validation Dice score of 72.12% on patients diagnosed with lung cancer, melanoma, and lymphoma in our cross-validation. Code: https://***/heiligerl/AutoPET-Challenge-Submission. © 2022, CC BY.

关键词： Tumors

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PANDORA Project for the study of photonuclear reactions below

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The European Physical Journal A 2023年第9期59卷 1-21页

作者： Tamii, A. Pellegri, L. Söderström, P.-A. Allard, D. Goriely, S. Inakura, T. Khan, E. Kido, E. Kimura, M. Litvinova, E. Nagataki, S. Neumann-Cosel, P. von Pietralla, N. Shimizu, N. Tsoneva, N. Utsuno, Y. Adachi, S. Adsley, P. Bahini, A. Balabanski, D. Baret, B. Bekker, J. A. C. Binda, S. D. Boicu, E. Bracco, A. Brandherm, I. Brezeanu, M. Brummer, J. W. Camera, F. Crespi, F. C. L. Dalal, R. Donaldson, L. M. Fujikawa, Y. Furuno, T. Haoning, H. Higuchi, R. Honda, Y. Gavrilescu, A. Inoue, A. Isaak, J. Jivan, H. Jones, P. Jongile, S. Just, O. Kawabata, T. Khumalo, T. Kiener, J. Kleemann, J. Kobayashi, N. Koshio, Y. Kuşoğlu, A. Li, K. C. W. Malatji, K. L. Molaeng, R. E. Motoki, H. Murata, M. Netshiya, A. A. Neveling, R. Niina, R. Okamoto, S. Ota, S. Papst, O. Parizot, E. Petruse, T. Reen, M. S. Ring, P. Sakanashi, K. Sideras-Haddad, E. Siem, S. Spall, M. Suda, T. Sudo, T. Taniguchi, Y. Tatischeff, V. Utsunomiya, H. Wang, H. Werner, V. Wibowo, H. Wiedeking, M. Wieland, O. Xu, Y. Yang, Z. H. Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki Japan Institute for Radiation Sciences (IRS) Osaka University Toyonaka Japan Department of Physics Osaka University Toyonaka Japan School of Physics University of the Witwatersrand Johannesburg South Africa Themba Laboratory for Accelerator Based Sciences Somerset West South Africa Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH) Bucharest-Măgurele Romania Laboratoire Astroparticule et Cosmologie CNRS Université Paris Cité Paris France Institut d’Astronomie et d’Astrophysique Université Libre de Bruxelles Brussels Belgium Tokyo Institute of Technology Tokyo Japan IJCLab CNRS/IN2P3 Université Paris-Saclay Orsay Cedex France RIKEN Wako Japan Department of Physics Hokkaido University Sapporo Japan Faculty of Science Japan and Nuclear Reaction Data Centre Hokkaido University Sapporo Japan Department of Physics Western Michigan University Kalamazoo USA Institut für Kernphysik Technische Universität Darmstadt Darmstadt Germany Center for Computational Sciences University of Tsukuba Tsukuba Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Japan Cyclotron and Radioisotope Center Tohoku University Sendai Japan Department of Physics and Astronomy Texas A &M University College Station USA Cyclotron Institute Texas A &M University College Station USA University of Bucharest Bucharest-Măgurele Romania Dipartimento di Fisica dell’Università degli Studi di Milano Milan Italy INFN Sezione di Milano Milan Italy Guru Jambheshwar University of Science and Technology Hisar India Department of Physics Kyoto University Kyoto Japan Politehnica University of Bucharest Bucharest Romania GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Department of Physics Okayama University Okayama Japan Department of Physics Faculty of Science Istanbul University Istanbul Turkey Depart

Photonuclear reactions of light nuclei below a mass of $$A=60$$ are planned to be studied experimentally and theoretically with the PANDORA (Photo-Absorption of Nuclei and Decay Observation for Reactions in Astrophysics) project. Two experimental methods, virtual photon excitation by proton scattering and real photo absorption by a high-brilliance $$\gamma $$ -ray beam produced by laser Compton scattering, will be applied to measure the photoabsorption cross sections and decay branching ratio of each decay channel as a function of the photon energy. Several nuclear models, e.g. anti-symmetrized molecular dynamics, mean-field and beyond-mean-field models, a large-scale shell model, and ab initio models, will be employed to predict the photonuclear reactions. The uncertainty in the model predictions will be evaluated based on the discrepancies between the model predictions and experimental data. The data and predictions will be implemented in the general reaction calculation code, TALYS. The results will be applied to the simulation of the photo-disintegration process of ultra-high-energy cosmic rays in inter-galactic propagation.

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