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Measurement of Co59(γ,n)Co58 using a new flat-efficiency neutron detector at the Shanghai Laser Electron Gamma Source

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Physical Review C 2025年第5期111卷 054612-054612页

作者： Meng-Die Zhou Zi-Rui Hao Qian-Kun Sun Long-Xiang Liu Hang-Hua Xu Yue Zhang Pu Jiao Zhi-Cai Li Wen Luo Yu-Xuan Yang Sheng Jin Kai-Jie Chen Shan Ye Zhen-Wei Wang Yu-Ting Wang Hui-Ling Wei Yao Fu Kun Yu Hong-Wei Wang Gong-Tao Fan Chun-Wang Ma School of Physics Centre for Theoretical Physics Henan Normal University Xinxiang 453007 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100080 Beijing China School of Nuclear Science and Technology University of South China Hengyang 421001 China School of Physics and Microelectronics Zhengzhou University Zhengzhou 450001 China ShanghaiTech University Shanghai 201210 China China Institute of Atomic Energy Beijing 102413 China Henan Key Laboratory of Infrared Spectrum Measures and Applications Henan Normal University Xinxiang 453007 China Institute of Nuclear Science and Technology Henan Academy of Sciences Zhengzhou 450015 China

The (γ,n) cross sections for the Co59 isotope within the range of giant dipole resonance were measured using laser Compton scattering (LCS) γ rays at the Shanghai Laser Electron Gamma Source (SLEGS), Shanghai Synchrotron Radiation Facility (SSRF). A new neutron flat efficiency detector (FED) array was employed for neutron detection, and a BGO detector with 100% efficiency was utilized to precisely determine the energy distribution of the LCS radiation. The incident energy of γ was adjusted from Eγ=10.52MeV to 18.95 MeV by adjusting the collision angles of the laser to the electron beam in the SSRF storage ring and compared with the experimental data and the TENDL-2023 evaluated data. The experimental results are significantly different from those of the Livermore and other bremsstrahlung-generated γ source, but better agree with those measured by the LCS γ source. The measurement data were used as experimental constraint to extract the gamma strength function (γSF), and the inverse reaction cross section of Co58(n, γ) was subsequently calculated.

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Stimulated emission at 1.54 µm from Erbium/Oxygen-doped silicon-based light emitting diodes

arXiv

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arXiv 2020年

作者： Hong, Jin Wen, Huimin He, Jiajing Liu, Jingquan Dan, Yaping Tomm, Jens W. Yue, Fangyu Chu, Junhao Duan, Chungang Key Laboratory of Polar Materials and Devices Ministry of Education East China Normal University Shanghai200241 China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Laboratory Department of Micro/Nano Electronics University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai200240 China Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie Max-Born-Str. 2A Berlin12489 Germany National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences 500 Yutian Road Shanghai200083 China

Silicon-based light sources including light-emitting diodes (LEDs) and laser diodes (LDs) for information transmission are urgently needed for developing monolithic integrated silicon photonics. Silicon doped by ion implantation with erbium ions (Er3+) is considered a promising approach, but suffers from an extremely low quantum efficiency. Here we report an electrically pumped superlinear emission at 1.54 µm from Er/O-doped silicon planar LEDs, which are produced by applying a new deep cooling process. Stimulated emission at room temperature is realized with a low threshold current of ~6 mA (~0.8 A/cm2). Time-resolved photoluminescence and photocurrent results disclose the complex carrier transfer dynamics from the silicon to Er3+ by relaxing electrons from the indirect conduction band of the silicon. This picture differs from the frequently-assumed energy transfer by electron-hole pair recombination of the silicon host. Moreover, the amplified emission from the LEDs is likely due to a quasi-continuous Er/O-related donor band created by the deep cooling technique. This work paves a way for fabricating superluminescent diodes or efficient LDs at communication wavelengths based on rare-earth doped silicon. © 2020, CC BY.

关键词： Rare earths

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Probing short-range correlations in the deuteron via incoherent diffractive J/ψ production with spectator tagging at the EIC

arXiv

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arXiv 2020年

作者： Tu, Zhoudunming Jentsch, Alexander Baker, Mark Zheng, Liang Lee, Jeong-Hun Venugopalan, Raju Hen, Or Higinbotham, Douglas Aschenauer, Elke-Caroline Ullrich, Thomas Department of Physics Brookhaven National Laboratory UptonNY11973 United States Mark D. Baker Physics and Detector Simulations LLC Miller PlaceNY11764 United States Wuhan430074 China Key Laboratory of Quark and Lepton Physics Ministry of Education and Institute of Particle Physics Central China Normal University Wuhan430079 China Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States Electron Ion Collider Center Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States

Understanding the role of Quantum Chromodynamics in generating nuclear forces is important for uncovering the mechanism of short-ranged nuclear interactions and their manifestation in short range correlations (SRC). The future Electron-Ion-Collider (EIC) at Brookhaven National laboratory in the US will provide an unprecedented opportunity to systematically investigate the underlying physics of SRC for energies and kinematic regions that are otherwise impossible to reach. We study SRCs in electron-deuteron scattering events using the Monte Carlo event generator BeAGLE. Specifically, we investigate the sensitivity of observables to high internal nucleon momentum in incoherent diffractive J/ψ vector meson production. In a plane wave impulse approximation, the initial state deuteron wavefunction can be accessed directly from the four-momentum of the spectator nucleon. We use realistic physics simulations and far-forward detector simulations of the EIC to fully reveal the physics potential of this exclusive process. In particular, we provide the luminosity and detector requirements necessary to study SRCs in the deuteron at an EIC. Copyright © 2020, The Authors. All rights reserved.

关键词： Deuterium

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Tunable giant magnetoresistance in a single-molecule junction

arXiv

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arXiv 2020年

作者： Yang, Kai Chen, Hui Pope, Thomas Hu, Yibin Liu, Liwei Wang, Dongfei Tao, Lei Xiao, Wende Fei, Xiangmin Zhang, Yu-Yang Luo, Hong-Gang Du, Shixuan Xiang, Tao Hofer, Werner A. Gao, Hong-Jun Institute of Physics University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing100190 China School of Natural and Environmental Sciences Newcastle University NewcastleNE1 7RU United Kingdom State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China School of Physical Science and Technology Lanzhou University Lanzhou730000 China

Controlling electronic transport through a single-molecule junction is crucial for molecular electronics or spintronics. In magnetic molecular devices, the spin degree-of-freedom can be used to this end since the magnetic properties of the magnetic ion centers fundamentally impact the transport through the molecules. Here we demonstrate that the electron pathway in a single-molecule device can be selected between two molecular orbitals by varying a magnetic field, giving rise to a tunable anisotropic magnetoresistance up to 93%. The unique tunability of the electron pathways is due to the magnetic reorientation of the transition metal center, resulting in a re-hybridization of molecular orbitals. We obtain the tunneling electron pathways by Kondo effect, which manifests either as a peak or a dip line shape. The energy changes of these spin-reorientations are remarkably low and less than one millielectronvolt. The large tunable anisotropic magnetoresistance could be used to control electronic transport in molecular spintronics. Copyright © 2020, The Authors. All rights reserved.

关键词： Molecular orbitals

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Deep levels analysis in wavelength extended InGaAsBi photodetector

arXiv

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arXiv 2019年

作者： Huang, Jian Chen, Baile Deng, Zhuo Gu, Yi Ma, Yingjie Zhang, Jian Chen, Xiren Shao, Jun Optoelectronic Device Laboratory School of Information Science and Technology ShanghaiTech University Shanghai201210 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China State Key Laboratory of Transducer Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

InP based dilute Bismide InGaAsBi material is emerging as a promising candidate for extending short wavelength infrared detection. One critical factor to limit the performance of these InGaAsBi photodiodes is dark current caused by defects within the material. In this work, low frequency noise spectroscopy (LFNS) and temperature varied photoluminescence was used to characterize the defect levels in the devices. Three deep levels located at Ec -0.33 eV, Ev +0.14 eV, and Ec -0.51 eV were identified from the LFNS spectra, which are consistent with emission peak energy found by photoluminescence spectra of InGaAsBi. Copyright © 2019, The Authors. All rights reserved.

关键词： Photoluminescence

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Compact and variable radio emission from an active galaxy with supersoft X-ray emission

arXiv

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arXiv 2022年

作者： Yang, Lei Shu, Xinwen Zhang, Fabao Chandola, Yogesh Liu, Daizhong Liu, Yi Gu, Minfeng Giustini, Margherita Jiang, Ning Li, Ya-Ping Li, Di Elbaz, David Juneau, Stephanie Pannella, Maurilio Sun, Luming Tang, Ningyu Wang, Tinggui Zhou, Hongyan Department of Physics Anhui Normal University Anhui Wuhu241002 China Purple Mountain Observatory Chinese Academy of Sciences No.10 Yuanhua Road Qixia District Nanjing210023 China Giessenbachstr. 1 GarchingD-85748 Germany Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China CSIC-INTA Camino Bajo del Castillo s/n Villanueva de la Cañada MadridE-28692 Spain Department of Astronomy University of Science and Technology of China Anhui Hefei230026 China National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China Laboratoire AIM-Paris-Saclay CEA/DRF Irfu - CNRS Université Paris Diderot CEA-Saclay Gif-sur-Yvette91191 France NSF’s National Optical-Infrared Astronomy Research Laboratory 950 North Cherry Ave TucsonAZ85719 United States Università di Trieste Dipartimento di Fisica Sezione di Astronomia via Tiepolo 11 Trieste34143 Italy Polar Research Institute of China 451 Jinqiao Road Shanghai China

RX J1301.9+2747 is a unique active galaxy with supersoft X-ray spectrum that lacks significant emission at energies above 2 keV. In addition, it is one of few galaxies displaying quasi-periodic X-ray eruptions that recur on a timescale of 13-20 ks. We present multi-epoch radio observations of RX J1301.9+2747 using GMRT, VLA and VLBA. The VLBA imaging at 1.6 GHz reveals a compact radio emission unresolved at a scale of b>5 × 107 K. The radio emission is variable by more than a factor of 2.5 over a few days, based on the data taken from VLA monitoring campaigns. The short-term radio variability suggests that the radio emitting region has a size as small as 8 × 10−4 pc, resulting in an even higher brightness temperature of Tb∼1012 K. A similar limit on the source size can be obtained if the observed flux variability is not intrinsic and caused by the interstellar scintillation effect. The overall radio spectrum is steep with a time-averaged spectral index α = −0.78 ± 0.03 between 0.89 GHz and 14 GHz. These observational properties rule out a thermal or star-formation origin of the radio emission, and appear to be consistent with the scenario of episodic jet ejections driven by magnetohydrodynamic process. Simultaneous radio and X-ray monitoring observations down to a cadence of hours are required to test whether the compact and variable radio emission is correlated with the quasi-periodic X-ray eruptions. © 2022, CC BY.

关键词： Active Galactic Nuclei

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Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS

arXiv

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arXiv 2024年

作者： Dholakia, Shishir Palethorpe, Larissa Venner, Alexander Mortier, Annelies Wilson, Thomas G. Huang, Chelsea X. Rice, Ken Van Eylen, Vincent Nabbie, Emma Cloutier, Ryan Boschin, Walter Ciardi, David Delrez, Laetitia Dransfield, Georgina Ducrot, Elsa Essack, Zahra Everett, Mark E. Gillon, Michaël Hooton, Matthew J. Kunimoto, Michelle Latham, David W. López-Morales, Mercedes Li, Bin Li, Fan McDermott, Scott Murphy, Simon Murray, Catriona A. Seager, Sara Timmermans, Mathilde Triaud, Amaury Turner, Daisy A. Twicken, Joseph D. Vanderburg, Andrew Wang, Su Wittenmyer, Robert A. Wright, Duncan University of Southern Queensland Centre for Astrophysics West Street ToowoombaQLD4350 Australia SUPA Institute for Astronomy University of Edinburgh Blackford Hill EdinburghEH9 3HJ United Kingdom Centre for Exoplanet Science University of Edinburgh EdinburghEH9 3HJ United Kingdom Mullard Space Science Laboratory University College London Holmbury St Mary Dorking SurreyRH5 6NT United Kingdom School of Physics and Astronomy University of Birmingham Edgbaston BirminghamB15 2TT United Kingdom Department of Physics University of Warwick Gibbet Hill Road CoventryCV4 7AL United Kingdom Centre for Exoplanets and Habitability University of Warwick CoventryCV4 7AL United Kingdom Canary IslandsE-38712 Spain Canary IslandsE-38205 Spain Canary IslandsE-38205 Spain NASA Exoplanet Science Institute IPAC California Institute of Technology PasadenaCA91125 United States Department of Physics & Astronomy McMaster University 1280 Main St W HamiltonONL8S 4L8 Canada Astrobiology Research Unit University of Liège Allée du 6 août 19 Sart-Tilman Liège4000 Belgium Institute Université de Liège Allée du 6 Août 19C Liège4000 Belgium Institute of Astronomy KU Leuven Celestijnenlaan 200D Leuven3001 Belgium AIM CEA CNRS Université Paris-Saclay Université de Paris Gif-sur-YvetteF-91191 France Department of Physics and Astronomy The University of New Mexico 210 Yale Blvd NE AlbuquerqueNM87106 United States NSF’s National Optical-Infrared Astronomy Research Laboratory 950 N. Cherry Ave. TucsonAZ85719 United States Astrobiology Research Unit Université de Liège Allée du 6 Août 19C Liège4000 Belgium Cavendish Laboratory JJ Thomson Avenue CambridgeCB3 0HE United Kingdom Department of Physics Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA02139 United States Center for Astrophysics Harvard & Smithsonian 60 Garden St CambridgeMA02138 United States CAS Key Laboratory of Planetary Scie

We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright (V = 12.6 mag, K = 7.8 mag) metal-poor M4V star only 12.162 ± 0.005 pc away from the Solar System with one of the lowest stellar activity levels known for an M-dwarf. A planet candidate was detected by TESS based on only 3 transits in sectors 42, 43, and 57, with an ambiguity in the orbital period due to observational gaps. We performed follow-up transit observations with CHEOPS and ground-based photometry with MINERVA-Australis, SPECULOOS, and Purple Mountain Observatory, as well as further TESS observations in sector 70. We statistically validate Gliese 12 b as a planet with an orbital period of 12.76144 ± 0.00006 days and a radius of 1.0 ± 0.1 R☉, resulting in an equilibrium temperature of ∼315K. Gliese 12 b has excellent future prospects for precise mass measurement, which may inform how planetary internal structure is affected by the stellar compositional environment. Gliese 12 b also represents one of the best targets to study whether Earth-like planets orbiting cool stars can retain their atmospheres, a crucial step to advance our understanding of habitability on Earth and across the Galaxy. © 2024, CC BY.

关键词： Satellites

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Co 9 S 8 / [email protected] , N co-doped porous carbon derived from MOFs as an efficient catalyst for the oxygen evolution reaction

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Journal of Physics and Chemistry of Solids 2021年 148卷

作者： Shun Wang Gaoliang Zhou Jianguo Lv Yuxuan Ma Ying Wang Changjuan Hu Junjun Zhang Jin Yang Gang He Miao Zhang Min Zhao Xiaoshuang Chen Lei Yang School of Physics and Materials Engineering Hefei Normal University Hefei 230601 China Key Laboratory for Photoelectric Detection Science and Technology of Education Department of Anhui Province Hefei Normal University Hefei 230601 China School of Physics and Material Science Anhui University Hefei 230039 China National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China Department of Chemistry and Materials Engineering Hefei University Hefei 230601 China

Co 9 S 8 / [email protected] ,N co-doped porous carbon were successfully prepared by using thiourea and Co-based metal organic frameworks (Co-MOFs) as precursor and template. The porous carbon with a large surface area provides a favorable transport environment for the electrons and ions in the electrolyte. Co 9 S 8 /CoS nanoparticles and S doping may reduce the Ohmic series resistance (R s ) and charge transfer resistance (R ct ) of the electrocatalysts. The prepared Co-1.8/NC-0.3 composite shows excellent electrocatalytic performance for oxygen evolution reaction (OER) with a low overpotential of 180 mV at 10 mA cm −2 and high durability in 1 M KOH solution. The R ct and R s values of Co-1.8/NC-0.3 are 5.01 × 10 −6 and 1.72Ω. The lowest R ct indicates that the catalysts has lower resistance and more OER activities at the electrode/electrolyte interface in comparison with the other catalyst.

关键词： Co 9 S 8 / [email protected] ,N co-doped porous carbon Oxygen evolution reaction Metal-organic frameworks Electrocatalysts

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Damage characteristics of VO2 films under nanosecond/picosecond laser

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IOP Conference Series: Materials science and Engineering 2020年第1期711卷

作者： Yuan Lu Yunsong Feng LeiLei Chen Chang Wu Infrared and Low Temperature Plasma Key Laboratory of Anhui Province Hefei 230037 China State Key Laboratory of Pulsed Power Laser Technology Hefei 230037 China National Synchronous Radiation Laboratory of University of Science and Technology of China Hefei 230037 Po box 904 460 Huangshan Road Hefei city Anhui Province P.R. China

Vanadium dioxide films were prepared by magnetron sputtering method. An experimental apparatus for laser damaging VO2 thin film was set up. Nanosecond laser and picosecond lasers were used to irradiate the thin film. The damage morphology of the thin film under these two kinds of laser was observed by metallographic microscope. Under the action of nanosecond laser, the damage of thin film is mainly thermal damage, which is mainly determined by the energy contained in the laser pulse itself, and the required damage threshold is relatively higher. The zero probability damage threshold of monopulse irradiate the film is about 0.13J/*** femtosecond laser, the damage of thin film is caused by multi-photon ionization and avalanche ionization, and the damage threshold is relatively lower. The zero probability damage threshold of monopulse irradiate the film is about 10.2m J/cm2.

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JWST/CEERS sheds light on dusty star-forming galaxies: Forming bulges, lopsidedness, and outside-in quenching at cosmic noon

arXiv

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arXiv 2023年

作者： Le Bail, Aurelien Daddi, Emanuele Elbaz, David Dickinson, Mark Giavalisco, Mauro Magnelli, Benjamin Gomez-Guijarro, Carlos Kalita, Boris S. Koekemoer, Anton M. Holwerda, Benne W. Bournaud, Frederic de la Vega, Alexander Calabro, Antonello Dekel, Avishai Cheng, Yingjie Bisigello, Laura Franco, Maximilien Costantin, Luca Lucas, Ray A. Perez-Gonzalez, Pablo G. Lu, Shiying Wilkins, Stephen M. Haro, Pablo Arrabal Bagley, Micaela B. Finkelstein, Steven L. Kartaltepe, Jeyhan S. Papovich, Casey Pirzkal, Nor Yung, L.Y. Aaron Universite Paris-Saclay Universite Paris Cite CEA CNRS AIM Gif-sur-Yvette91191 France NSF's National Optical-Infrared Astronomy Research Laboratory 950 N. Cherry Ave. TucsonAZ85719 United States University of Massachusetts Amherst 710 North Pleasant Street AmherstMA01003-9305 United States Kavli Institute for the Physics and Mathematics of the Universe The University of Tokyo Kashiwa277-8583 Japan Kavli Institute for Astronomy and Astrophysics Peking University Beijing100871 China UTIAS The University of Tokyo Kashiwa Chiba277-8583 Japan Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Physics & Astronomy Department University of Louisville LouisvilleKY40292 United States Department of Physics and Astronomy University of California 900 University Ave RiversideCA92521 United States INAF - Osservatorio Astronomico di Roma via di Frascati 33 Monte Porzio Catone00078 Italy Racah Institute of Physics The Hebrew University of Jerusalem Jerusalem91904 Israel Dipartimento di Fisica e Astronomia "G.Galilei" Universita di Padova Via Marzolo 8 PadovaI-35131 Italy INAF-Osservatorio Astronomico di Padova Vicolo dell'Osservatorio 5 PadovaI-35122 Italy Department of Astronomy The University of Texas at Austin AustinTX United States CSIC-INTA Ctra. de Ajalvir km 4 Madrid Torrejon de ArdozE-28850 Spain School of Astronomy and Space Science Nanjing University Nanjing210093 China Key Laboratory of Modern Astronomy and Astrophysics Nanjing University Ministry of Education Nanjing210093 China Astronomy Centre University of Sussex Brighton FalmerBN1 9QH United Kingdom Institute of Space Sciences and Astronomy University of Malta MsidaMSD 2080 Malta Laboratory for Multiwavelength Astrophysics School of Physics and Astronomy Rochester Institute of Technology 84 Lomb Memorial Drive RochesterNY14623 United States Department of Physics and Astronomy Texas A&M University College StationTX77843-4242

Context. We investigate the morphology and resolved physical properties of a sample of 22 IR-selected dusty star-forming galaxies at cosmic noon using the James Webb Space Telescope NIRCam images obtained in the EGS field for the CEERS survey. The exceptional resolution of the NIRCam images allowed us to spatially resolve these galaxies up to 4.4μm and identify their bulge or core even when very extinguished by dust. Aims. The goal of this study is to obtain a better understanding of the formation and evolution of FIR-bright galaxies by spatially resolving their properties using JWST in order to look through the dust and bridge the gap between the compact FIR sources and the larger optical star-forming galaxies. Methods. Based on red-green-blue images from the F115W, F200W, and F444W filters, we divided each galaxy into several uniformly colored regions, fit their respective SEDs, and measured physical properties. After classifying each region as star forming or quiescent, we assigned galaxies to three classes depending on whether active star formation is located in the core, in the disk, or in both. Results. (i) We find that the galaxies at a higher redshift tend to have a fragmented disk with a low core mass fraction. They are at an early stage of bulge formation. When moving toward a lower redshift, the core mass fraction increases, and the bulge growth is associated with a stabilization of the disk, which translates into less patches and clumps. The NIRCam data clearly point toward bulge formation in preexisting disks. (ii) Lopsidedness is a very common feature of DSFGs. It has been wrongly overlooked for a long time and could have a major impact on the evolution of DSFGs. (iii) Twenty-three percent of the galaxies have a star-forming core embedded in a quiescent disk. They seem to be undergoing outside-in quenching, often facilitated by their strong lopsidedness inducing instabilities. (iv) We show that half of our galaxies with star formation concentrated in t

关键词： Galaxies

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