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PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)最新文献

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The complexity of clustered DNA DSBs in human fibroblasts under the action of low and high-LET radiation 低、高let辐射作用下人成纤维细胞聚集性DNA dsb的复杂性
D. Shamina, A. Boreyko, M. Zadneprianetc, T. Hramco, M. Krupnova, E. Kulikova, A. Pavlova, E. Smirnova, Anfisa S. Filatova
High-order clustered DNA lesions are the hallmark of the action of dense-ionizing radiation. It is defined as a combination of two or more individual lesions (single-strand breaks (SSB) and double-strand breaks (DSB), base damage, etc.) located within 1-2 DNA helical turns. Clustered DNA DSBs, containing DSBs and other DNA lesions, represent specific interest for investigation. To research the induction and repair of clustered DNA DSBs, human fibroblasts were irradiated with 60Co γ-rays (LET ≈ 0.3 keV/μm), 15N ions (LET = 181.4 keV/μm, E = 13 MeV/n) and protons in the expanded Bragg peak (LET = 2 – 100 keV/μm, E = 0.01 – 44 MeV/n). The dose for all types of irradiation was 1.25 Gy. The key proteins involved in the repair of base damage (OGG1) and DNA DSBs (53BP1) were visualized by immunocytochemical staining and fluorescence microscopy. To characterize the structure of clustered DNA lesions the detailed quantitative analysis of OGG1 and 53BP1 foci clusters was completed. The obtained results showed the formation of clustered DNA DSBs with higher complexity structure and low repair efficiency under the action of protons and 15N ions compare to γ-rays.
高阶聚集性DNA损伤是密集电离辐射作用的标志。它被定义为位于1-2个DNA螺旋转内的两个或多个个体病变(单链断裂(SSB)和双链断裂(DSB)、碱基损伤等)的组合。集群DNA dsb,包含dsb和其他DNA病变,代表了研究的特殊兴趣。采用60Co γ射线(LET≈0.3 keV/μm)、15N离子(LET = 181.4 keV/μm, E = 13 MeV/n)和扩展布拉格峰质子(LET = 2 ~ 100 keV/μm, E = 0.01 ~ 44 MeV/n)对人成纤维细胞进行诱导和修复研究。各类辐照剂量均为1.25 Gy。通过免疫细胞化学染色和荧光显微镜观察参与碱基损伤修复的关键蛋白(OGG1)和DNA DSBs (53BP1)。为了表征聚集性DNA病变的结构,我们完成了OGG1和53BP1病灶簇的详细定量分析。结果表明,与γ射线相比,质子和15N离子作用下形成的簇状DNA dsb结构更复杂,修复效率较低。
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引用次数: 0
Calibration procedure of the ΔE − E detectors for Deuteron breakup reaction investigation at intermediate energies at nuclotron 用于核中子中能量氘核分裂反应研究的ΔE−E探测器的校准程序
O. Mezhenska, M. Janek, V. Ladygin, S. Piyadin, Y. Gurchin, A. Isupov, J. Karachuk, A. Khrenov, P. Kurilkin, A. N. Livanov, S. Reznikov, A. Terekhin, J. Urban
The aim of the deuteron spin structure (DSS) experiment is to obtain polarization observables in dp elastic scattering and in dp breakup at large CMS angles (> 60°). The dp breakup reaction has been investigated by the scintillation detectors placed at the vicinity of the Internal Target Station (ITS) of Nuclotron. Calibration data have been obtained at the deuteron energy of 300 - 500 MeV. The main goal of this report is to present the calibration procedure of the ΔE - E detectors. Calibration coefficients are used to recover the deposited particle energy.
氘核自旋结构(DSS)实验的目的是获得大CMS角(> 60°)下dp弹性散射和dp破裂的极化观测值。利用放置在原子核内部靶站(ITS)附近的闪烁探测器研究了dp分解反应。在氘核能量为300 - 500兆电子伏特的情况下获得了标定数据。本报告的主要目的是介绍ΔE - E探测器的校准程序。校正系数用于恢复沉积粒子的能量。
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引用次数: 0
Development of the MPD fast forward detector electronics test bench MPD快进探测器电子试验台的研制
I.N. Eremkina, V. Rogov, S. Sergeev, V. Yurevich
A test bench for the Front-End Electronics (FEE) of the Fast Forward Detector (FFD), which is a part of the Multi-Purpose Detector (MPD) facility, has been developed. The test bench includes a FEE testing card and two types of pulse generators. The FEE testing card and one signal generator are used for the front-end board parameters check. This procedure includes verification of the channel gain, the pulse shape and width, the FEE working conditions, etc. The second one is Low-Voltage Differential Signaling (LVDS) generator intended for Signal Processing Module (SPM) testing with special software. This procedure includes checking the SPM signal processing algorithms.
作为多用途探测器(MPD)设施的一部分,快速前进探测器(FFD)的前端电子(FEE)测试台已经开发完成。试验台包括一个FEE测试卡和两种脉冲发生器。使用FEE测试卡和一个信号发生器对前端板参数进行检测。该程序包括通道增益、脉冲形状和宽度、FEE工作条件等的验证。第二个是低压差分信号(LVDS)发生器,用于信号处理模块(SPM)测试,使用特殊软件。这个过程包括检查SPM信号处理算法。
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引用次数: 0
Weak decays of heavy Baryons 重子的弱衰变
Z. Tyulemissov, A. Issadykov, K. Nurlan
We have made a three-loop quark model calculation of the W -exchange contribution to the nonleptonic two-body sdecays of the doubly charmed baryons Ξcc++ and Ωcc+. The W -exchange contributions appear in addition to the factorizable tree graph contributions and are not suppressed in general. We make use of the covariant confined quark model previously developed by us to calculate the tree graph as well as the W -exchange contribution. We calculate helicity amplitudes and quantitatively compare the tree graph and W -exchange contributions. Finally, we compare the calculated decay widths with those from other theoretical approaches when they are available.
我们用三环夸克模型计算了双粲重子Ξcc++和Ωcc+的非轻子双体衰变的W交换贡献。W -exchange贡献出现在可分解树图贡献之外,并且通常不会被抑制。我们利用我们以前开发的协变受限夸克模型来计算树图和W交换贡献。我们计算了螺旋振幅,并定量地比较了树图和W交换的贡献。最后,我们将计算出的衰减宽度与其他可行的理论方法进行了比较。
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引用次数: 0
Using BDT method for the charm events selection in the DsTau experiment 利用BDT方法对DsTau实验中的魅力事件进行选择
E. Sitnikova
DsTau (NA65) at the CERN-SPS is a recently approved experiment, which aims to study the tau neutrino production in proton-nuclei interaction. The main source of tau neutrinos is the decay of Ds mesons, namely Ds → τντ and then τ → ντX. There is almost no data on the differential production cross section of Ds in proton-nucleus interactions, which leads to a large uncertainty of tau neutrino interaction cross section measurements preventing a precise test of Lepton Flavour Universality in neutrino scattering. DsTau addresses this issue and will provide essential inputs for future tau neutrino experiments. A large amount of charmed particles decay events (~105) is expected to be detected as well, providing a possibility for interesting by-product studies, in particular a search for intrinsic charm in a proton. The experimental method is based on a use of high resolution emulsion detectors for effective registration of events with short lived particle decays. Here I present the motivation of the study, details of the experimental technique and the possible improvement that BDT method can provide for the signal/background events separation.
DsTau (NA65)是欧洲核子研究中心(CERN-SPS)最近批准的一项实验,旨在研究质子-原子核相互作用中tau中微子的产生。τ中微子的主要来源是Ds介子的衰变,即Ds→τντ和τ→ντX。质子-核相互作用中Ds的微分产生截面几乎没有数据,这导致tau中微子相互作用截面测量的不确定性很大,阻碍了中微子散射中轻子味普适性的精确测试。DsTau解决了这个问题,并将为未来的tau中微子实验提供必要的输入。大量的粲粒子衰变事件(~105)预计也将被探测到,这为有趣的副产品研究提供了可能性,特别是对质子内在粲子的研究。实验方法是基于使用高分辨率乳剂检测器来有效登记具有短寿命粒子衰变的事件。在这里,我介绍了研究的动机,实验技术的细节以及BDT方法可以为信号/背景事件分离提供的可能改进。
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引用次数: 0
Partial-wave analysis of J/ψ → K+ K−π0 J/ψ→K+ K−π0的分波分析
I. Denisenko
A partial-wave analysis of the decay J/ψ → K+ K−π0 made using (223.7 ± 1.4) 106 J/ψ events collected with the BESIII detector in 2009 [1] will be presented and discussed. We report the most precise measurements of K*(892)± and K2*(1430)± mass and width. The analysis reveals contributions from K2*(1980)± and K4*(2045)± for the first time in J/ψ decays. Two resonance signals decaying to K+K− are also observed and their possible interpretations will be discussed. Results also include branching fractions for decays through intermediate states and a high precision measurement of B(J/ψ → K+ K−π0). The results of the partial-wave analysis differ significantly from those reported earlier by the BESII and BABAR Collaborations.
本文将介绍并讨论利用BESIII探测器在2009年[1]收集到的(223.7±1.4)106 J/ψ事件对J/ψ→K+ K−π0衰变的部分波分析。我们报告了K*(892)±和K2*(1430)±质量和宽度的最精确测量。分析首次揭示了K2*(1980)±和K4*(2045)±对J/ψ衰变的贡献。还观察到两个衰减到K+K−的共振信号,并讨论它们可能的解释。结果还包括通过中间态衰变的分支分数和B(J/ψ→K+ K−π0)的高精度测量。部分波分析的结果与先前由BESII和BABAR合作报告的结果有很大不同。
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引用次数: 1
Electronic Logbook platform for NICA experiments NICA实验电子日志平台
A. Chebotov, K. Gertsenberger, I. Slepov, A. Moshkin
The acquisition of experimental data is an integral part of all modern high-energy physics experiments. This task is of particular importance in the experiments of the NICA project, which is currently under construction at the Joint Institute for Nuclear Research, due to the high interaction rate of heavy ion collision events and the complexity of detector systems. During experiments sessions, not only the collected experimental data are important, but also parameters and conditions under which the experiments are conducted. To record and store all the information, the shift crew needs a structured and systematized online electronic journal. The article presents a new implementation of the Online Logbook System designed to automate the latter process for the NICA experiments. The Logbook System allows collaboration members to record information during experiment runs on current events, operation conditions of the detectors and their parameters, which are further used in raw data processing, reconstruction and physics analysis of the particle collision events in the experiments. A new version of the Electronic Logbook has been implemented as a configurable platform to be used in different experiments on particle collisions, such as a fixed target BM@N and collider MPD and SPD experiments of the NICA project. In addition, the specialized API and user Web service developed for viewing, changing and searching for the required logbook data, as well as a set of auxiliary services and a common deployment system are considered.
实验数据的获取是所有现代高能物理实验的一个组成部分。由于重离子碰撞事件的高相互作用率和探测器系统的复杂性,这项任务在目前正在联合核研究所建设的NICA项目的实验中特别重要。在实验过程中,不仅收集到的实验数据很重要,进行实验的参数和条件也很重要。为了记录和存储所有的信息,值班人员需要一个结构化和系统化的在线电子日志。本文提出了一种新的联机日志系统实现方案,旨在实现NICA实验后一过程的自动化。日志系统允许协作成员记录实验运行过程中发生的事件、探测器运行情况及其参数等信息,用于实验中粒子碰撞事件的原始数据处理、重建和物理分析。一个新版本的电子日志已被实现为一个可配置的平台,用于不同的粒子碰撞实验,如固定目标BM@N和NICA项目的对撞机MPD和SPD实验。此外,还考虑了为查看、更改和搜索所需日志数据而开发的专用API和用户Web服务,以及一组辅助服务和公共部署系统。
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引用次数: 1
The study of WH production using different event generators 使用不同事件发生器产生WH的研究
F. N. Ahmadov, M. A. Manashova
In this paper, we study the process of associated production of the Higgs boson with the W-boson. Signal and background processes are generated using the CompHEP, POWHEG and PYTHIA generators, and the obtained Monte Carlo data is processed in the ROOT program. From this data, in addition to the distributions of the traditional kinematic variables, the distribution for the new angular variables is also obtained. We compared the shape of the distributions of these variables obtained from different generators. It was found that the shape of these distributions is similar for different generators. The deviation of the distributions obtained from POWHEG from other generators can be explained by the fact that it uses NLO correction, but PYTHIA and CompHEP use the LO approximation.
本文研究了希格斯玻色子与w -玻色子联合产生的过程。使用CompHEP、POWHEG和PYTHIA生成器生成信号和后台进程,并在ROOT程序中处理获得的蒙特卡罗数据。从这些数据中,除了得到传统运动变量的分布外,还得到了新的角度变量的分布。我们比较了从不同的生成器获得的这些变量的分布形状。我们发现这些分布的形状对于不同的发电机是相似的。从POWHEG获得的分布与其他生成器的偏差可以解释为它使用NLO校正,而PYTHIA和CompHEP使用LO近似。
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引用次数: 0
L-Tryptophan metal-organic frameworks based on transition metals: Preparation, characterization and application for ruthenium3+ ions sorption 基于过渡金属的l-色氨酸金属-有机骨架:制备、表征及其在钌3+离子吸附中的应用
O. Ivanshina, I. Zuba, S. V. Sumnikov, A. Nabiyev, A. Pawlukojć
Three metal-organic frameworks, {[Zn(L-trp)(bpe)(H2O)]·2H2O·2NO3}n, {[Co(L-trp)(bpe)(H2O)]·H2O·NO3}n and {[Ni(L-trp)(bpe)(H2O)]·H2O·NO3}n were prepared from amino acid L-tryptophan (L-Htrp), 1,2-bis(4-pyridyl)ethylene) (bpe), and the Zn2+, Co2+ and Ni2+ ions respectively. The obtained crystals were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Synthesized materials were checked for sorption of ruthenium from aqueous solutions. From this series of metal-organic frameworks, only Ni-compound is suitable for the adsorption experiments.
以氨基酸l-色氨酸(l-色氨酸)、1,2-双(4-吡啶基)乙烯(bpe)和Zn2+、Co2+和Ni2+离子为原料,分别制备了{[Zn(L-trp)(bpe)(H2O)]·2H2O·2NO3}n、{[Co(L-trp)(bpe)(H2O)]·H2O·NO3}n和{[Ni(L-trp)(bpe)(H2O)]·H2O·NO3}n三个金属有机骨架。采用x射线衍射(XRD)、热重分析(TGA)和差示扫描量热法(DSC)对所得晶体进行了表征。对合成材料从水溶液中吸附钌进行了检测。在这一系列的金属有机骨架中,只有ni化合物适合进行吸附实验。
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引用次数: 0
Problem-oriented interface for MICC 面向问题的MICC接口
N. Balashov, N. Kutovskiy, I. Sokolov
The saas.jinr.ru service is an attempt to simplify the usage of the JINR Multifunctional Information and Computing Complex (MICC). The project mainly focuses on evaluating the potential of problem-oriented web-interfaces and ways to ease the access to all of the major computing facilities of the MICC. The paper covers the project's current state, including the service architecture and its capabilities overview, and further development plans.
ru服务试图简化JINR多功能信息和计算综合体(MICC)的使用。该项目主要侧重于评估面向问题的网络接口的潜力,以及简化访问MICC所有主要计算设施的方法。本文涵盖了项目的当前状态,包括服务体系结构及其功能概述,以及进一步的开发计划。
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引用次数: 1
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PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)
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