检索结果-内蒙古大学图书馆

arXiv 2023年

作者： Singha, Jaikhomba Joshi, Bhal Chandra Krishnakumar, M.A. Kareem, Fazal Bathula, Adarsh Dwivedi, Churchil Jacob, Shebin Jose Desai, Shantanu Tarafdar, Pratik Arumugam, P. Arumugam, Swetha Bagchi, Manjari Batra, Neelam Dhanda Dandapat, Subhajit Deb, Debabrata Debnath, Jyotijwal Gopakumar, A. Gupta, Yashwant Hisano, Shinnosuke Kato, Ryo Kikunaga, Tomonosuke Marmat, Piyush Nobleson, K. Paladi, Avinash K. Pandian, Arul B. Prabu, Thiagaraj Rana, Prerna Srivastava, Aman Surnis, Mayuresh Susobhanan, Abhimanyu Takahashi, Keitaro Group Department of Mathematics and Applied Mathematics University of Cape Town Cape Town7700 South Africa Department of Physics Indian Institute of Technology Roorkee Uttarakhand Roorkee247667 India National Centre for Radio Astrophysics Tata Institute of Fundamental Research Maharashtra Pune411007 India Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 Bonn53121 Germany Fakultät für Physik Universität Bielefeld Postfach 100131 Bielefeld33501 Germany Department of Physical Sciences IISER Kolkata West Bengal India Center of Excellence in Space Sciences India IISER Kolkata West Bengal India Indian Institute of Science Education and Research Mohali140306 India Department of Earth and Space Sciences Indian Institute of Space Science and Technology Valiamala P.O. Kerala Thiruvananthapuram695547 India Department of Physics Government Brennen College Thalassery Kannur University Kerala Kannur670106 India Department of Physics IIT Hyderabad Telangana Kandi502284 India The Institute of Mathematical Sciences C. I. T. Campus Taramani Chennai600113 India Department of Electrical Engineering IIT Hyderabad Telangana Kandi502284 India Homi Bhabha National Institute Training School Complex Anushakti Nagar Mumbai400094 India Department of Physics and Astrphysics Delhi University Delhi India Department of Astronomy and Astrophysics Tata Institute of Fundamental Research Homi Bhabha Road Navy Nagar Colaba Mumbai400005 India International Research Organization for Advanced Science and Technology Kumamoto University 2-39-1 Kurokami Kumamoto860-8555 Japan Osaka Central Advanced Mathematical Institute Osaka Metropolitan University Osaka5588585 Japan Faculty of Advanced Science and Technology Kumamoto University 2-39-1 Kurokami Kumamoto860-8555 Japan Kumamoto University Graduate School of Science and Technology Kumamoto860-8555 Japan Australia Telescope National Facility CSIRO Space and Astronomy PO Box 76 EppingNSW1710 Australia

A pulsar's pulse profile gets broadened at low frequencies due to dispersion along the line of sight or due to multi-path propagation. The dynamic nature of the interstellar medium makes both of these effects time-dependent and introduces slowly varying time delays in the measured times-of-arrival similar to those introduced by passing gravitational waves. In this article, we present an improved method to correct for such delays by obtaining unbiased dispersion measure (DM) measurements by using low-frequency estimates of the scattering parameters. We evaluate this method by comparing the obtained DM estimates with those, where scatter-broadening is ignored using simulated data. A bias is seen in the estimated DMs for simulated data with pulse-broadening with a larger variability for a data set with a variable frequency scaling index, α, as compared to that assuming a Kolmogorov turbulence. Application of the proposed method removes this bias robustly for data with band averaged signal-to-noise ratio larger than 100. We report the measurements of the scatter-broadening time and α from analysis of PSR J1643−1224, observed with upgraded Giant Metrewave Radio Telescope as part of the Indian Pulsar Timing Array experiment. These scattering parameters were found to vary with epoch and α was different from that expected for Kolmogorov turbulence. Finally, we present the DM time-series after application of this technique to PSR J1643−1224. Copyright © 2023, The Authors. All rights reserved.

关键词： Pulsars

来源：评论

学校读者我要写书评

暂无评论

Precessing jet nozzle connecting to a spinning black hole in M87

arXiv

引用

arXiv 2023年

作者： Cui, Yuzhu Hada, Kazuhiro Kawashima, Tomohisa Kino, Motoki Lin, Weikang Mizuno, Yosuke Ro, Hyunwook Honma, Mareki Yi, Kunwoo Yu, Jintao Park, Jongho Jiang, Wu Shen, Zhiqiang Kravchenko, Evgeniya Algaba, Juan-Carlos Cheng, Xiaopeng Cho, Ilje Giovannini, Gabriele Giroletti, Marcello Jung, Taehyun Lu, Ru-Sen Niinuma, Kotaro Oh, Junghwan Ohsuga, Ken Sawada-Satoh, Satoko Sohn, Bong Won Takahashi, Hiroyuki R. Takamura, Mieko Tazaki, Fumie Trippe, Sascha Wajima, Kiyoaki Akiyama, Kazunori An, Tao Asada, Keiichi Buttaccio, Salvatore Byun, Do-Young Cui, Lang Hagiwara, Yoshiaki Hirota, Tomoya Hodgson, Jeffrey Kawaguchi, Noriyuki Kim, Jae-Young Lee, Sang-Sung Lee, Jee Won Lee, Jeong Ae Maccaferri, Giuseppe Melis, Andrea Melnikov, Alexey Migoni, Carlo Oh, Se-Jin Sugiyama, Koichiro Wang, Xuezheng Zhang, Yingkang Chen, Zhong Hwang, Ju-Yeon Jung, Dong-Kyu Kim, Hyo-Ryoung Kim, Jeong-Sook Kobayashi, Hideyuki Li, Bin Li, Guanghui Li, Xiaofei Liu, Zhiyong Liu, Qinghui Liu, Xiang Oh, Chung-Sik Oyama, Tomoaki Roh, Duk-Gyoo Wang, Jinqing Wang, Na Wang, Shiqiang Xia, Bo Yan, Hao Yeom, Jae-Hwan Yonekura, Yoshinori Yuan, Jianping Zhang, Hua Zhao, Rongbing Zhong, Weiye Research Center for Intelligent Computing Platforms Zhejiang Laboratory Hangzhou311100 China Tsung-Dao Lee Institute Shanghai Jiao Tong University 520 Shengrong Road Shanghai201210 China Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Mizusawa VLBI Observatory National Astronomical Observatory of Japan 2-12 Hoshigaoka Mizusawa Iwate Oshu023-0861 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwanoha Chiba Kashiwa277-8582 Japan Kogakuin University of Technology & Engineering Academic Support Center 2665-1 Nakano-machi Hachioji Tokyo192-0015 Japan South-Western Institute For Astronomy Research Yunnan University Kunming650500 China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Institut für Theoretische Physik Goethe-Universität Frankfurt Max-von-Laue-Straße 1 Frankfurt am MainD-60438 Germany Korea Astronomy & Space Science Institute Daedeokdae-ro 776 Yuseong-gu Daejeon34055 Korea Republic of Department of Astronomy Yonsei University Yonsei-ro 50 Seodaemun-gu Seoul03722 Korea Republic of Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Department of Physics and Astronomy Seoul National University Gwanak-gu Seoul08826 Korea Republic of Department of Information Countermeasure Air Force Early Warning Academy Wuhan430019 China Institute of Astronomy and Astrophysics Academia Sinica HiloHI96720 United States Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Beijing100101 China Moscow Institute of Physics and Technology Dolgoprudny Institutsky per. 9 Moscow141700 Russia Lebedev Physical Institute The Russian Academy of Sciences Leninsky prospekt 53 Moscow119991 Russia Department of Physics Faculty of Science U

The nearby radio galaxy M87 offers a unique opportunity to explore the connections between the central supermassive black hole and relativistic jets. Previous studies of the inner region of M87 revealed a wide opening angle for the jet originating near the black hole 1–4. The Event Horizon Telescope resolved the central radio source and found an asymmetric ring structure consistent with expectations from General Relativity 5. With a baseline of 17 years of observations, there was a shift in the jet’s transverse position, possibly arising from an eight to ten-year quasi-periodicity 3. However, the origin of this sideways shift remains unclear. Here we report an analysis of radio observations over 22 years that suggests a period of about 11 years in the position angle variation of the jet. We infer that we are seeing a spinning black hole that induces the Lense-Thirring precession of a misaligned accretion disk. Similar jet precession may commonly occur in other active galactic nuclei but has been challenging to detect owing to the small magnitude and long period of the variation. Copyright © 2023, The Authors. All rights reserved.

关键词： Active Galactic Nuclei

来源：评论

学校读者我要写书评

暂无评论

Electron Acceleration in Carbon Nanotubes

arXiv

引用

arXiv 2025年

作者： Bonţoiu, Cristian Bonatto, Alexandre Apsimon, Öznur Bandiera, Laura Cavoto, Gianluca Drebot, Illya Gatti, Giancarlo Giner-Navarro, Jorge Lei, Bifeng Martín-Luna, Pablo Rago, Ilaria Pérez, Juan Rodríguez Nunes, Bruno Silveira Sytov, Alexei Valagiannopoulos, Costas Welsch, Carsten P. Xia, Guoxing Resta-López, Javier Department of Physics University of Liverpool Oxford Street LiverpoolL69 7ZE United Kingdom Graduate Program in Information Technology and Healthcare Management the Beam Physics Group Federal University of Health Sciences of Porto Alegre RS Porto Alegre90050-170 Brazil Department of Physics and Astronomy University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Cockroft Institute Keckwick Lane Daresbury WarringtonWA4 4AD United Kingdom INFN Sezione di Ferrara Via Saragat 1 Ferrara44122 Italy Dipartimento di Fisica Sapienza Università di Roma Piazzale Aldo Moro 2 Roma00185 Italy INFN Sezione di Roma Piazzale Aldo Moro 2 Rome00185 Italy INFN Sezione di Milano Via G. Celoria 16 Milano20133 Italy Centro de Láseres Pulsados Building M5 Science Park Calle Adaja 8 Salamanca Villamayor37185 Spain Universidad de Valencia Paterna46071 Spain Universidad de Valencia CSIC Paterna46980 Spain Nuclear and Energy Research Institute IPEN–CNEN SP São Paulo Brazil National Technical University of Athens School of Electrical and Computer Engineering Zografou157 73 Greece Departamento de Física Aplicada y Electromagnetismo Universidad de Valencia Burjassot46100 Spain

Laser wakefield acceleration (LWFA) may achieve TeV/m gradients using high-density solid-state plasmas as accelerating media. However, the application of bulk solid materials requires attosecond laser pulses, such as X-ray lasers, to drive wakefields at these high densities. Additionally, the short wakefield wavelengths associated with solid-state plasmas greatly limit the accelerating length. An alternative approach employs 2D carbon-based nanomaterials, like graphene or carbon nanotubes (CNTs), configured into structured targets. These nanostructures are designed with voids or low-density regions to effectively reduce the overall plasma density. This reduction enables the use of longer-wavelength lasers and also extends the plasma wavelength and the acceleration length. In this study, we present, to our knowledge, the first numerical demonstration of electron acceleration via self-injection into a wakefield bubble driven by an infrared laser pulse in structured CNT targets, similar to the behavior observed in gaseous plasmas for LWFA in the nonlinear (or bubble) regime. Using the PIConGPU code, bundles of CNTs are modeled in a 3D geometry as 25 nm-thick carbon tubes with an initial density of 1022 cm−3. The carbon plasma is ionized by a three-cycle, 800 nm wavelength laser pulse with a peak intensity of 1021 W cm−2, achieving an effective plasma density of 1020 cm−3. The same laser also drives the wakefield bubble, responsible for the electron self-injection and acceleration. Simulation results indicate that fs-long electron bunches with hundreds of pC charge can be self-injected and accelerated at gradients exceeding 1 TeV/m. Both charge and accelerating gradient figures are unprecedented when compared with LWFA in gaseous plasma. © 2025, CC BY-NC-ND.

关键词： X ray lasers

来源：评论

学校读者我要写书评

暂无评论

Gendered citation practices in the field of communication

引用

Annals of the International Communication Association 2021年第2期45卷 134-153页

作者： Wang, X. Dworkin, J.D. Zhou, D. Stiso, J. Falk, E.B. Bassett, D.S. Zurn, P. Lydon-Staley, D.M. Annenberg School for Communication University of Pennsylvania Philadelphia PA United States Department of Psychiatry Columbia University Medical Center New York NY United States New York State Psychiatric Institute New York NY United States Neuroscience Graduate Group Perelman School of Medicine University of Pennsylvania Philadelphia PA United States Department of Psychology University of Pennsylvania Philadelphia PA United States Wharton Marketing Department University of Pennsylvania Philadelphia PA United States Department of Bioengineering School of Engineering and Applied Science University of Pennsylvania Philadelphia PA United States Department of Physics & Astronomy College of Arts and Sciences University of Pennsylvania Philadelphia PA United States Department of Electrical & Systems Engineering School of Engineering and Applied Science University of Pennsylvania Philadelphia PA United States Department of Neurology Perelman School of Medicine University of Pennsylvania Philadelphia PA United States Department of Psychiatry Perelman School of Medicine University of Pennsylvania Philadelphia PA United States Santa Fe Institute Santa Fe NM United States Department of Philosophy and Religion American University Washington DC United States Leonard Davis Institute of Health Economics University of Pennsylvania Philadelphia PA United States

In disciplines outside of communication, papers with women as first and last (i.e. senior) authors attract fewer citations than papers with men in those positions. Using data from 14 communication journals from 1995 to 2018, we find that reference lists include more papers with men as first and last author, and fewer papers with women as first and last author, than would be expected if gender were unrelated to referencing. This imbalance is driven largely by the citation practices of men and is slowly decreasing over time. The structure of men’s co-authorship networks partly accounts for the observed over-citation of men by other men. We discuss ways researchers might approach gendered citations in their work. © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

关键词： Citations communication gender inequality publication

来源：评论

学校读者我要写书评

暂无评论

Tantalizing new physics from the cosmic purview

arXiv

引用

arXiv 2019年

作者： Melia, Fulvio Department of Physics Applied Math Program Department of Astronomy University of Arizona AZ85721 United States

The emergence of a highly improbable coincidence in cosmological observations speaks to a remarkably simple cosmic expansion. Compelling evidence now suggests that the Universe’s gravitational horizon, coincident with the better known Hubble sphere, has a radius improbably equal to the distance light could have travelled since the Big Bang. The confirmation of this unexpected result would undoubtedly herald the influence of new physics, yet appears to be unavoidable after a recent demonstration that the Friedmann-Lemaître-Robertson-Walker metric is valid only for the so-called zero active mass equation of state. As it turns out, a cosmic fluid with this property automatically produces the aforementioned equality, leaving little room for a cosmological constant. The alternative—a dynamical dark energy—would suggest an extension to the standard model of particle physics, and a serious re-evaluation of the Universe’s early history. Copyright © 2019, The Authors. All rights reserved.

关键词： Equations of state

来源：评论

学校读者我要写书评

暂无评论

The Past and Future of East Asia to Italy: Nearly Global VLBI

arXiv

引用

arXiv 2023年

作者： Giovannini, Gabriele Cui, Yuzhu Hada, Kazuhiro Yi, Kunwoo Ro, Hyunwook Sohn, Bong Won Takamura, Mieko Buttaccio, Salvatore D’Ammando, Filippo Giroletti, Marcello Hagiwara, Yoshiaki Kino, Motoki Kravchenko, Evgeniya Maccaferri, Giuseppe Melnikov, Alexey Niinuma, Kotaro Orienti, Monica Wajima, Kiyoaki Akiyama, Kazunori Doi, Akihiro Byun, Do-Young Hirota, Tomoya Honma, Mareki Jung, Taehyun Kobayashi, Hideyuki Koyama, Shoko Melis, Andrea Migoni, Carlo Murata, Yasuhiro Nagai, Hiroshi Sawada-Satoh, Satoko Stagni, Matteo Istituto Nazionale di Astrofisica Istituto di Radioastronomia Via P. Gobetti 101 Bologna40129 Italy Dipartimento di Fisica e Astronomia Bologna University Bologna40129 Italy Research Center for Intelligent Computing Platforms Zhejiang Laboratory Hangzhou311100 China Mizusawa VLBI Observatory National Astronomical Observatory of Japan 2-12 Hoshigaoka Oshu023-0861 Japan Department of Astronomical Science The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka181-8588 Japan Department of Physics and Astronomy Seoul National University Gwanak-ro 1 Gwanak-gu Seoul08826 Korea Republic of Department of Astronomy Yonsei University Yonsei-ro 50 Seodaemun-gu Seoul03722 Korea Republic of Korea Astronomy and Space Science Institute Daedeok-daero 776 Yuseong-gu Daejeon34055 Korea Republic of Department of Astronomy and Space Science University of Science and Technology Gajeong-ro 217 Yuseong-gu Daejeon34113 Korea Republic of Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Tokyo113-0033 Japan Natural Science Laboratory Toyo University 5-28-20 Hakusan Tokyo112-8606 Japan Oude Hoogeveensedijk 4 Dwingeloo7991 PD Netherlands Academic Support Center Kogakuin University of Technology and Engineering Tokyo192-0015 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka181-8588 Japan Moscow Institute of Physics and Technology Dolgoprudny Institutsky per. 9 Moscow141700 Russia Lebedev Physical Institute Russian Academy of Sciences Leninsky Prospekt 53 Moscow119991 Russia Institute of Applied Astronomy Russian Academy of Sciences Kutuzova Embankment 10 St. Petersburg191187 Russia Graduate School of Sciences and Technology for Innovation Yamaguchi University Yamaguchi753-8512 Japan The Research Institute for Time Studies Yamaguchi University Yamaguchi753-8511 Japan National Radio Astronomy Observatory 520 Edgemont Rd. CharlottesvilleVA22903 United States Massachusett

We present here the East Asia to Italy Nearly Global VLBI (EATING VLBI) project. How this project started and the evolution of the international collaboration between Korean, Japanese, and Italian researchers to study compact sources with VLBI observations is reported. Problems related to the synchronization of the very different arrays and technical details of the telescopes involved are presented and discussed. The relatively high observation frequency (22 and 43 GHz) and the long baselines between Italy and East Asia produced high-resolution images. We present example images to demonstrate the typical performance of the EATING VLBI array. The results attracted international researchers and the collaboration is growing, now including Chinese and Russian stations. New in progress projects are discussed and future possibilities with a larger number of telescopes and a better frequency coverage are briefly discussed herein. © 2023, CC BY.

关键词： Active Galactic Nuclei

来源：评论

学校读者我要写书评

暂无评论

Large Amplitude Motion in 9-Methylanthracene:High-Resolution Spectroscopy and Ab Initio Theoretical Calculation

引用

Chinese Journal of Chemical physics 2020年第1期33卷 8-12页

作者： Masaaki Baba Ayumi Kanaoka Akiko Nishiyama Masatoshi Misono Takayoshi Ishimoto Taro Udagawa Division of Chemistry Graduate School of ScienceKyoto UniversityKyoto 606-8502Japan Institute of Physics Faculty of PhysicsAstronomy and InformaticsNicolaus Copernicus University in TorunTorun 87-100Poland Department of Applied Physics Faculty of ScienceFukuoka UniversityJonan-kuFukuoka 814-0180Japan Association of International Arts and Science Institute of Natural Science Yokohama City UniversityKanazawa-kuYokohama 236-0027Japan Department of Chemistry and Biomolecular Science Faculty of EngineeringGifu UniversityYanagidoGifu 501-1193Japan

CH3 internal rotation is one of the typical large amplitude motions in polyatomic molecules,the spectral analysis and theoretical calculations of which,were developed by Li-Hong Xu and Jon *** observed a Doppler-free high-resolution and high-precision spectrum of 9-methylanthracene(9MA)by using the collimated supersonic jet and optical frequency comb *** potential energy curve of CH3 internal rotation is expressed by a six-fold symmetric sinusoidal *** was previously shown that the barrier height(V6)of 9MA-d12 was considerably smaller than that of 9MA-h12[***,et al.,***.A 113,2366(2009)].We performed ab initio theoretical calculations of the multicomponent molecular orbital *** barrier reduction by deuterium substitution was partly attributed to the difference between the wave functions of H and D atomic nuclei.

关键词： CH3 internal rotation 9-Methylanthracene High-resolution spectroscopy Optical frequency comb Ab initio caclulation

来源：评论

学校读者我要写书评

暂无评论

Enhanced Deuteron Coalescence Probability in Jets

引用

Physical Review Letters 2023年第4期131卷 042301-042301页

作者： S. Acharya D. Adamová A. Adler G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. Ahmad S. U. Ahn I. Ahuja A. Akindinov M. Al-Turany D. Aleksandrov B. Alessandro H. M. Alfanda R. Alfaro Molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev M. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata S. Arcelli M. Aresti R. Arnaldi J. G. M. C. A. Arneiro I. C. Arsene M. Arslandok A. Augustinus R. Averbeck M. D. Azmi A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio M. Barlou G. G. Barnaföldi L. S. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid S. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied S. Belokurova V. Belyaev G. Bencedi S. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann M. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin M. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro S. Biswas N. Bize J. T. Blair D. Blau M. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov S. Boi J. Bok L. Boldizsár A. Bolozdynya M. Bombara P. M. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. M. Bouziani L. Bratrud P. Braun-Munzinger M. Bregant M. Broz G. E. Bruno M. D. Buckland D. Budnikov H. Buesching S. Bufalino O. Bugnon P. Buhler Z. Buthelezi S. A. Bysiak M. Cai H. Caines A. Caliva E. Calvo Villar J. M. M. Camacho P. Camerini F. D. M. Canedo M. Carabas A. A. Carballo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos F. Catalano C. Ceballos Sanchez I. Chakaberia P. Chakraborty S. Chandra S. Chapeland M. Chartier S. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. S. Chizzali J. Cho S. Cho P. Chochula P. Chri Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy University of Houston Houston Texas United States Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Munster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California United States SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Universidade de São Pa

The transverse-momentum (pT) spectra and coalescence parameters B2 of (anti)deuterons are measured in p-p collisions at s=13 TeV for the first time in and out of jets. In this measurement, the direction of the leading particle with the highest pT in the event (pTlead>5 GeV/c) is used as an approximation for the jet axis. The event is consequently divided into three azimuthal regions, and the jet signal is obtained as the difference between the toward region, that contains jet fragmentation products in addition to the underlying event (UE), and the transverse region, which is dominated by the UE. The coalescence parameter in the jet is found to be approximately a factor of 10 larger than that in the underlying event. This experimental observation is consistent with the coalescence picture and can be attributed to the smaller average phase-space distance between nucleons in the jet cone as compared with the underlying event. The results presented in this Letter are compared to predictions from a simple nucleon coalescence model, where the phase-space distributions of nucleons are generated using pythia8 with the Monash 2013 tuning, and to predictions from a deuteron production model based on ordinary nuclear reactions with parametrized energy-dependent cross sections tuned on data. The latter model is implemented in pythia8.3. Both models reproduce the observed large difference between in-jet and out-of-jet coalescence parameters, although the almost flat trend of the B2Jet is not reproduced by the models, which instead give a decreasing trend.

关键词： Hadron-hadron interactions

来源：评论

学校读者我要写书评

暂无评论

Measurement of the Lifetime and Λ Separation Energy of HΛ3

引用

Physical Review Letters 2023年第10期131卷 102302-102302页

作者： S. Acharya D. Adamová A. Adler G. Aglieri Rinella M. Agnello N. Agrawal Z. Ahammed S. Ahmad S. U. Ahn I. Ahuja A. Akindinov M. Al-Turany D. Aleksandrov B. Alessandro H. M. Alfanda R. Alfaro Molina B. Ali Y. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev M. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli C. Anuj N. Apadula L. Aphecetche H. Appelshäuser C. Arata S. Arcelli M. Aresti R. Arnaldi I. C. Arsene M. Arslandok A. Augustinus R. Averbeck M. D. Azmi A. Badalà Y. W. Baek X. Bai R. Bailhache Y. Bailung R. Bala A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio M. Barlou G. G. Barnaföldi L. S. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch F. Baruffaldi N. Bastid S. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied S. Belokurova V. Belyaev G. Bencedi S. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann M. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin M. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro S. Biswas N. Bize J. T. Blair D. Blau M. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov S. Boi J. Bok L. Boldizsár A. Bolozdynya M. Bombara P. M. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. M. Bouziani L. Bratrud P. Braun-Munzinger M. Bregant M. Broz G. E. Bruno M. D. Buckland D. Budnikov H. Buesching S. Bufalino O. Bugnon P. Buhler Z. Buthelezi J. B. Butt S. A. Bysiak M. Cai H. Caines A. Caliva E. Calvo Villar J. M. M. Camacho P. Camerini F. D. M. Canedo M. Carabas A. A. Carballo F. Carnesecchi R. Caron J. Castillo Castellanos F. Catalano C. Ceballos Sanchez I. Chakaberia P. Chakraborty S. Chandra S. Chapeland M. Chartier S. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. S. Chizzali J. Cho S. Cho P. Chochula P. Chri Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico COMSATS University Islamabad Islamabad Pakistan Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy University of Houston Houston Texas United States Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Munster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory California United States SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3

The most precise measurements to date of the HΛ3 lifetime τ and Λ separation energy BΛ are obtained using the data sample of Pb-Pb collisions at sNN=5.02 TeV collected by ALICE at the LHC. The HΛ3 is reconstructed via its charged two-body mesonic decay channel (HΛ3→He3+π− and the charge-conjugate process). The measured values τ=[253±11(stat)±6(syst)] ps and BΛ=[102±63(stat)±67(syst)] keV are compatible with predictions from effective field theories and confirm that the HΛ3 structure is consistent with a weakly bound system.

关键词： Meson & hyperon induced nuclear reactions Relativistic heavy-ion collisions Hyperons

来源：评论

学校读者我要写书评

暂无评论

JASMINE: Near-Infrared Astrometry and Time Series Photometry Science

arXiv

引用

arXiv 2023年

作者： Kawata, Daisuke Kawahara, Hajime Gouda, Naoteru Secrest, Nathan J. Kano, Ryouhei Kataza, Hirokazu Isobe, Naoki Ohsawa, Ryou Usui, Fumihiko Yamada, Yoshiyuki Graham, Alister W. Pettitt, Alex R. Asada, Hideki Baba, Junichi Bekki, Kenji Dorland, Bryan N. Fujii, Michiko Fukui, Akihiko Hattori, Kohei Hirano, Teruyuki Kamizuka, Takafumi Kashima, Shingo Kawanaka, Norita Kawashima, Yui Klioner, Sergei A. Kodama, Takanori Koshimoto, Naoki Kotani, Takayuki Kuzuhara, Masayuki Levine, Stephen E. Majewski, Steven R. Masuda, Kento Matsunaga, Noriyuki Miyakawa, Kohei Miyoshi, Makoko Morihana, Kumiko Nishi, Ryoichi Notsu, Yuta Omiya, Masashi Sanders, Jason Tanikawa, Ataru Tsujimoto, Masahiro Yano, Taihei Aizawa, Masataka Arimatsu, Ko Biermann, Michael Boehm, Celine Chiba, Masashi Debattista, Victor P. Gerhard, Ortwin Hirabayashi, Masayuki Hobbs, David Ikenoue, Bungo Izumiura, Hideyuki Jordi, Carme Kohara, Naoki Löffler, Wolfgang Luri, Xavier Mase, Ichiro Miglio, Andrea Mitsuda, Kazuhisa Newswander, Trent Nishiyama, Shogo Obuchi, Yoshiyuki Ootsubo, Takafumi Ouchi, Masami Ozaki, Masanobu Perryman, Michael Prusti, Timo Ramos, Pau Read, Justin I. Rich, R. Michael Schönrich, Ralph Shikauchi, Minori Shimizu, Risa Suematsu, Yoshinori Tada, Shotaro Takahashi, Aoi Tatekawa, Takayuki Tatsumi, Daisuke Tsujimoto, Takuji Tsuzuki, Toshihiro Urakawa, Seitaro Uraguchi, Fumihiro Utsunomiya, Shin Van Eylen, Vincent van Leeuwen, Floor Wada, Takehiko Walton, Nicholas A. National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Mullard Space Science Laboratory University College London Holmbury St. Mary Dorking SurreyRH5 6NT United Kingdom Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-1855 Japan U.S. Naval Observatory 3450 Massachusetts Ave NW WashingtonDC20392-5420 United States Department of Physics Kyoto University Kitashirakawa-oiwake-cho Sakyo-ku Kyoto606-8502 Japan Centre for Astrophysics and Supercomputing Swinburne University of Technology HawthornVIC3122 Australia Department of Physics and Astronomy California State University Sacramento 6000 J Street SacramentoCA95819-6041 United States Graduate School of Science and Technology Hirosaki University Aomori036-8561 Japan Graduate School of Science and Engineering Kagoshima University 1-21-35 Korimoto Kagoshima890-0065 Japan International Centre for Radio Astronomy Research The University of Western Australia 7 Fairway CrawleyWA6009 Australia Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Department of Earth and Planetary Science Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Institute of Statistical Mathematics 10-3 Midoricho Tachikawa Tokyo190-8562 Japan Astrobiology Center 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Institute of Astronomy Graduate School of Science The University of Tokyo 2-21-1 Osawa Mitaka Tokyo181-0015 Japan Center for Gravitational Physics and Quantum Information Yukawa Institute for Theoretical Physics Kyoto University Kitashirakawa-oiwake-cho Sakyo-ku Kyoto606-8502 Japan Cluster for Pioneering Research RIKEN 2-1 Hirosawa Saitama Wako351-0198 Japan Lohrmann Observ

Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science goals. One is the Galactic archaeology with Galactic Center Survey, which aims to reveal the Milky Way's central core structure and formation history from Gaia-level (∼25 µas) astrometry in the Near-Infrared (NIR) Hw-band (1.0-1.6 µm). The other is the Exoplanet Survey, which aims to discover transiting Earth-like exoplanets in the habitable zone from NIR time-series photometry of M dwarfs when the Galactic center is not accessible. We introduce the mission, review many science objectives, and present the instrument concept. JASMINE will be the first dedicated NIR astrometry space mission and provide precise astrometric information of the stars in the Galactic center, taking advantage of the significantly lower extinction in the NIR. The precise astrometry is obtained by taking many short-exposure images. Hence, the JASMINE Galactic center survey data will be valuable for studies of exoplanet transits, asteroseismology, variable stars and microlensing studies, including discovery of (intermediate mass) black holes. We highlight a swath of such potential science, and also describe synergies with other missions. © 2023, CC BY.

关键词： Time series

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：