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Expected performance of the FOOT experiment FOOT实验的预期性能
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2020-20101-9
G. Silvestre
The main objective of the FOOT (FragmentatiOn of Target) experiment is to measure the double differential cross-sections with respect to the kinetic energy and the angle of emission of fragments produced in nuclear interactions with an accuracy of 5%. Measurements will use the inverse kinematics approach to study the interaction of heavy ions with proton-rich targets and will be performed in two energy regions, one up to 400 MeV/u, to assess the effects of nuclear fragmentation in hadrontherapy treatment with proton beams, and up to 700 MeV/u, to improve the knowledge of the fragmentation of ions on nuclei to help with the design of space vehicles shielding.
靶碎片实验的主要目的是测量与核相互作用中产生的碎片的动能和发射角有关的双微分截面,精度为5%。测量将使用逆运动学方法来研究重离子与富质子目标的相互作用,并将在两个能量区域进行,一个高达400 MeV/u,以评估质子束强子治疗中核碎片的影响,以及高达700 MeV/u,以提高对原子核上离子碎片的了解,以帮助设计航天器屏蔽。
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引用次数: 0
Italian Physical Society : Characterization of plastic scintillators equipped with SiPM for the next generation of satellites for the study of cosmic radiation 意大利物理学会:为研究宇宙辐射的下一代卫星配备SiPM的塑料闪烁体的特性
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2020-20100-X
D. Serini, L. Venere, P. Fusco, F. Giordano, F. Gargano, M. Mazziotta, P. D. Luque, F. Loparco, S. Loporchio
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引用次数: 1
$K^+ rightarrow pi^+ nuoverline{nu}$ with NA62: 2016 results and prospects $K^+ rightarrow pi^+ nuoverline{nu}$ 与NA62: 2016年业绩及展望
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2019-19253-0
R. Piandanion
The ultra rare $K rightarrow pi nuoverline{nu}$ process is one of the theoretically cleanest meson decay where to look for a stringent test of the Standard Model (SM). The NA62 experiment at CERN SPS is designed to measure the branching ratio of the $K^+ rightarrow pi^+ nuoverline{nu}$ decay with 10% precision. After commissioning, in 2016 first data set good for physics has been collected. The data taking is foreseen till the LS2 at the end of 2018. Results obtained with the full 2016 data sample will be presented togheter with prospects for 2017 and 2018 data sets.
极其罕见的$K rightarrow pi nuoverline{nu}$过程是理论上最干净的介子衰变过程之一,需要对标准模型(SM)进行严格的测试。欧洲核子研究中心SPS的NA62实验旨在测量$K^+ rightarrow pi^+ nuoverline{nu}$衰变的分支比为10% precision. After commissioning, in 2016 first data set good for physics has been collected. The data taking is foreseen till the LS2 at the end of 2018. Results obtained with the full 2016 data sample will be presented togheter with prospects for 2017 and 2018 data sets.
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引用次数: 0
Cosmic ray origin and anisotropy measurement by the Pierre Auger Observatory 皮埃尔·奥格天文台的宇宙射线起源和各向异性测量
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2019-19245-0
G. Sigl
Recently the Pierre Auger Observatory has observed a dipolar anisotropy of amplitude 6.5% above 8 × 1018 eV that is unrelated to the Galactic plane. While the significance is largest above 8 × 1018 eV, the cosmic ray data indicate a growth of the dipolar amplitude from 4×1018 eV to 3.2×1019 eV and beyond. Furthermore, above 4 × 1019 eV, indications have been found for intermediate-scale anisotropies associated with extragalactic gamma-ray sources. Apart from those indications no other significant anisotropies are seen. We review these observations and discuss their relevance for the origin of ultra-high energy cosmic rays.
最近,皮埃尔·奥格天文台观测到一个偶极各向异性,其振幅为6.5%,高于8 × 1018 eV,与银道面无关。虽然在8 ×1018 eV以上的显著性最大,但宇宙射线数据表明偶极振幅从4×1018 eV到3.2×1019 eV甚至更高。此外,在4 × 1019 eV以上,已经发现了与河外伽玛射线源相关的中等尺度各向异性的迹象。除这些迹象外,未见其他显著的各向异性。我们回顾了这些观测结果,并讨论了它们与超高能量宇宙射线起源的相关性。
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引用次数: 0
Impact on | $V_{us}$| from decays: New BaBar results on $tau^- to K^- n pi^0nu_{tau}$(n = 0, 1, 2, 3) and $tau^- to pi^- n pi^0 nu_{tau}$(n = 3, 4) Impact on |美国V_{} |美元美元从decays: New BaBar results on美元知道^ - ^ 0 n到K ^ - pi nu_{知道}美元(n = 0, 1, 2, 3)和美元知道^ - ^ 到pi - n pi ^ 0 nu_{知道的(n = 3, 4美元)
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2019-19252-1
A. Filippion
This paper reports preliminary measurements of the branching fractions of τ hadronic decays in channels with one negative kaon or pion and multiple π0’s: τ − → K − nπ0ντ (with n = 0, 1, 2, 3) and τ − → π − nπ0ντ (with n = 3, 4). These measurements are of fundamental importance for the precise determination of the |Vus| Cabibbo-Kobahashi-Maskawa matrix element. Based on a data sample of about 435 million τ pairs produced in e+e − collisions at and near the Υ(4S) peak, collected by the BABAR experiment in about ten years of data taking, the following values have been obtained: B(τ − → K − ντ) = (7.174±0.033stat ±0.213sys)×10 −3, B(τ − → K − π0ντ) = (5.054 ± 0.021stat ± 0.148sys) × 10 −3, B(τ − → K − 2π0ντ) = (6.151 ± 0.117stat ± 0.338sys) × 10 −4, B(τ − → K − 3π0ντ) = (1.246 ± 0.164stat ± 0.238sys) × 10 −4, B(τ − → π − 3π0ντ) = (1.168 ± 0.006stat ± 0.038sys) × 10 −2 and B(τ − → π − 4π0ντ) = (9.020 ± 0.400stat ± 0.652sys) × 10 −4.
本文报道了τ强子衰变在一个负kaon或π介子和多个π0通道中的分支分数的初步测量:τ−→K−nπ - 0ντ (n = 0,1,2,3)和τ−→π−nπ - 0ντ (n = 3,4)。这些测量对于精确测定|Vus| Cabibbo-Kobahashi-Maskawa矩阵元素具有重要意义。根据BABAR实验近十年来收集的Υ(4S)峰及附近e+e−碰撞产生的约4.35亿个τ对数据样本,得到了以下值:B(τ−−→Kντ)=(7.174±0.033统计±0.213 sys)×10−3 B(τ−→K−π0ντ)=(5.054±0.021统计±0.148 sys)×10−3 B(τ−−2π0→Kντ)=(6.151±0.117统计±0.338 sys)×10−4 B(τ−−3π0→Kντ)=(1.246±0.164统计±0.238 sys)×10−4 B(τ−→π−3π0ντ)=(1.168±0.006统计±0.038 sys)×10−2和B(τ−→π−4π0ντ)=(9.020±0.400统计±0.652 sys)×10−4。
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引用次数: 0
The Cerenkov Telescope Array project status 切伦科夫望远镜阵列项目状态
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2019-19244-1
E. Bissaldi
The Cherenkov Telescope Array (CTA) represents the next generation ground-based observatory for gamma-ray astronomy at very-high energies. It will be capable of detecting gamma rays in the energy range from 20 GeV to more than 300 TeV with unprecedented precision in energy and directional reconstruction. CTA will be located in the northern hemisphere at La Palma, Spain, and in the southern hemisphere at Paranal, Chile, and will comprise more than 100 telescopes of three different types. CTA will be one of the largest astronomical infrastuctures in the world with open data access and it will address questions in astronomy, astrophysics and fundamental physics in the next decades. In this contribution we will present the status of the CTA construction, discuss the telescope prototypes, highlight the scientific perspectives and the instrument performances.
切伦科夫望远镜阵列(CTA)代表了下一代地面天文台的伽玛射线天文学在非常高的能量。它将能够探测能量范围从20 GeV到300 TeV以上的伽马射线,在能量和方向重建方面具有前所未有的精度。CTA将位于北半球的西班牙拉帕尔马和南半球的智利帕拉纳尔,将由三种不同类型的100多架望远镜组成。CTA将成为世界上最大的开放数据访问的天文基础设施之一,它将在未来几十年解决天文学、天体物理学和基础物理学方面的问题。在这篇文章中,我们将介绍CTA的建设现状,讨论望远镜的原型,突出科学的观点和仪器的性能。
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引用次数: 0
Supernova neutrino detection in XENONnT neutron and muon Vetoes XENONnT中子和介子的中微子探测
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2020-20119-Y
F. Pompa
The current phase of the XENON Dark Matter Project, named XENONnT, will be operative in 2020 in the underground Laboratori Nazionali del Gran Sasso (LNGS). It is a multi-ton detector for direct search of Dark Matter, consisting of a double phase liquid-gas xenon Time Projection Chamber (TPC) which contains 5.9 tons of liquid xenon target mass, inserted in a cryostat surrounded by a tank containing 700 tons of water doped with Gd sulphate. Its aim, as that of its precursor XENON1T, is to detect elastic scattering of Weakly Interacting Massive Particles (WIMPs) off xenon nuclei. The presence of two Veto sub-systems, the muon Veto instrumented with 84 photomultiplier tubes (PMTs) and the neutron Veto with other 120 PMTs, allows to reduce the background for WIMPs search through muon and neutron tagging, while the presence of Gd sulphate increases the neutron capture cross section. Thanks to the large xenon target used and the presence of the two Vetoes, XENONnT will be able also to detect all flavours of Supernova neutrinos. Here the results from Monte Carlo simulations of XENONnT detection efficiency are presented for Supernova neutrinos through their inverse beta decay interactions in water of the two Veto sub-systems.
XENON暗物质项目的当前阶段名为xenonnt,将于2020年在地下的格兰萨索国家实验室(LNGS)投入使用。它是一个用于直接搜索暗物质的多吨探测器,由一个双相液气氙时间投影室(TPC)组成,其中包含5.9吨液态氙目标质量,插入低温恒温器中,周围是一个装有700吨掺有硫酸Gd的水的水箱。和它的前身XENON1T一样,它的目标是探测弱相互作用大质量粒子(wimp)在氙核外的弹性散射。两个Veto子系统的存在,由84个光电倍增管(pmt)组成的μ否决权和由其他120个光电倍增管组成的中子否决权,允许通过μ子和中子标记减少wimp搜索的背景,而硫酸Gd的存在增加了中子捕获截面。由于使用了巨大的氙靶和两个vetoe的存在,XENONnT也将能够探测到所有类型的超新星中微子。本文利用蒙特卡罗模拟的结果,介绍了在两个Veto子系统中,超新星中微子在水中的逆betdecay相互作用对xenonnt探测效率的影响。
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引用次数: 0
$CP$ violation in charm at LHCb $CP$违反了LHCb的魅力
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2019-19250-3
T. Pajero
$CP$While the CKM paradigm of CP violation has been tested extensively in $K$ and $B$ mesons, $CP$ violation remains unobserved in the decay of up-type quarks. The study of $CP$ violation in charm decays is thus a complementary test of the Standard Model, since it allows constraining $CP$-violating operators that might leave the observables of down-type quarks unaffected. Two recent measurements of $CP$ violation in charm decays by the LHCb Collaboration are reviewed. Their precision, below the $10^{-3}$ level, is finally entering the upper limit of the range of Standard Model predictions. The forthcoming Upgrade I of LHCb (2021–2029) will allow pushing the precision of the searches for $CP$ violation in charm below the $10^{-4}$ level.
虽然CP破坏的CKM范式已经在K介子和B介子中得到了广泛的测试,但在上型夸克的衰变中仍然没有观察到CP破坏。因此,对粲衰中$CP$违反的研究是对标准模型的一种补充测试,因为它允许约束$CP$违反的算子,这些算子可能不影响下型夸克的可观测值。本文回顾了LHCb合作对粲衰变中$CP$违反的两个最新测量结果。他们的精度低于$10^{-3}$的水平,最终进入了标准模型预测范围的上限。即将到来的LHCb升级1(2021-2029)将允许将符码中$CP$违规的搜索精度提高到$10^{-4}$水平以下。
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引用次数: 0
Neutrinoless double beta decay search with the GERDA experiment 用GERDA实验寻找中微子双衰变
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2020-20024-5
V. D’Andrea
The Gerda experiment, located at the Laboratori Nazionali del Gran Sasso (LNGS), searches for the neutrinoless double beta decay of 76Ge. The experiment is using 36 kg of high-purity germanium detectors, simultaneously as source and detector, deployed into ultra-pure cryogenic liquid argon. Gerda is one the leading experiments in the field, reporting the highest sensitivity on the half-life of 0νββ decay with 1.1 · 1026 yr, the lowest background index with 6 · 10 −4 cts/(keV·kg·yr) and an excellent energy resolution of 0.12% (FWHM). The experimental setup, the analysis procedures and the latest results of Gerda are summarized in the present work.
位于格兰萨索国家实验室(LNGS)的Gerda实验寻找76Ge的中微子双β衰变。实验采用36公斤的高纯锗探测器,源和探测器同时进行,部署到超纯低温液态氩中。Gerda是该领域领先的实验之一,报道了对0νββ衰变半衰期的最高灵敏度为1.1·1026 yr,最低背景指数为6·10−4 cts/(keV·kg·yr),出色的能量分辨率为0.12% (FWHM)。本文综述了Gerda的实验设置、分析步骤和最新结果。
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引用次数: 6
Design and performance of the Calorimeter for the FOOT experiment FOOT实验量热计的设计与性能
IF 4.5 2区 物理与天体物理 Q1 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.1393/NCC/I2020-20123-3
L. Scavarda
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引用次数: 2
期刊
Rivista Del Nuovo Cimento
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