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1.
KATRIN will have the capability to push the limit on the mass of the electron anti-neutrino to 200 meV (90% C.L.) by investigating the kinematics of the electrons from tritium β decay very close to the endpoint of the β spectrum. The importance of this experiment will be discussed in various contributions to this school. KATRIN is currently under construction at KIT (Karlsruhe Institute of Technology). This talk gives an overview over the status of KATRIN with emphasis on the aspects of KATRIN not covered by the talks following this one. 相似文献
3.
The VEPP-4 accelerator-accumulator complex is designed for carrying out experiments with colliding electron-positron beams with the energy in the range of from 1 to 5 GeV using a VEPP-4M collider equipped with the KEDR magnetic detector. Experiments in the field of high-energy physics (HEP) using the complex in its present state have been being carried out since 2002. Science programs other than HEP programs are carried out in the VEPP-4, including experiments with synchrotron-radiation (SR) beams and studies on nuclear physics with an internal gas target, on verification of the CPT invariance, on accelerator physics, etc. The status of the complex, main results, methods used, new approaches, and long-term plans have been described. 相似文献
5.
In this brief review the following topics are discussed:
Direct searches for SUSY in mSUGRA: a brief review of the relevant mass limits, the clean trilepton signal, the hunt for the
third generation of sfermions,
Direct searches beyond mSUGRA: search prospects in models with nonuniversal gaugino masses, search prospects in models with
nonuniversal scalar masses,
Indirect searches for SUSY: precision electroweak observables and SUSY, ε′/ε and SUSY. 相似文献
6.
Glueballs and other resonances with large gluonic components are predicted as bound states by Quantum Chromodynamics (QCD). The lightest (scalar) glueball is estimated to have a mass in the range from 1 to 2 GeV/ c2; pseudoscalar and tensor glueballs are expected at higher masses. Many different experiments exploiting a large variety of production mechanisms have presented results in recent years on light mesons with JPC=0 ++, 0 −+, and 2 ++ quantum numbers. This review looks at the experimental status of glueballs. Good evidence exists for a scalar glueball which is mixed with nearby mesons, but a full understanding is still missing. Evidence for tensor and pseudoscalar glueballs are weak at best. Theoretical expectations of phenomenological models and QCD on the lattice are briefly discussed. 相似文献
7.
The XMASS project utilizes ultrapure liquid xenon and aims to detect pp and 7Be solar neutrinos by means of ν
e
e scattering. It requires low background and a low threshold, which will also enable us to search for dark matter in the Galactic
halo. By using a prototype detector, we have confirmed its feasibility to realize low background and low threshold. We have
estimated the sensitivity of an 800-kg liquid-xenon detector for a dark matter search experiment based on the experimental
results.
for the XMASS Collaboration
The text was submitted by the author in English. 相似文献
8.
Lithium-ion batteries have dominated the battery industry for the past several years in portable electronic devices due to their high volumetric and gravimetric energy densities. The success of these batteries in small-scale applications translates to large-scale applications, with an important impact in the future of the environment by improving energy efficiency and reduction of pollution. We present the progress that allows several lithium-intercalation compounds to become the active cathode element of a new generation of Li-ion batteries, namely the 5-V cathodes, which are promising to improve the technology of energy storage and electric transportation, and address the replacement of gasoline engine by meeting the increasing demand for green energy power sources. The compounds considered here include spinel LiNi 0.5Mn 1.5O 4 and its related doped-structures, olivine LiCoPO 4, inverse spinel LiNiVO 4 and fluorophosphate Li 2CoPO 4F. LiNi 0.5Mn 1.5O 4 thin films, nanoscale prepared materials and surface-modified cathode particles are also considered. Emphasis is placed on the quality control that is needed to guarantee the reliability and the optimum electrochemical performance of these materials as the active cathode element of Li-ion batteries. The route to increase the performance of Li-ion batteries with the other members of the family is also discussed. 相似文献
9.
Observational cosmology has indeed made very rapid progress in recent years. The ability to quantify the universe has largely
improved due to observational constraints coming from structure formation. The transition to precision cosmology has been
spear-headed by measurements of the anisotropy in the cosmic microwave background (CMB) over the past decade. Observations
of the large scale structure in the distribution of galaxies, high red-shift supernova, have provided the required complementary
information. We review the current status of cosmological parameter estimates from joint analysis of CMB anisotropy and large
scale structure (LSS) data. We also sound a note of caution on overstating the successes achieved thus far. 相似文献
10.
The main purpose of the NUCLEON experiment is direct measurements of the energy spectra of cosmic rays in the range 10 11–10 15 eV with the use of the lightweight facility during a prolonged orbital flight. The energy is determined using a technique based on the measurement of the spatial density of secondary particles produced in the initial event of inelastic interaction. The schematic diagram of the NUCLEON facility, the current status of the project, the results of testing the prototype, and plans are presented. 相似文献
12.
The China Spallation Neutron Source (CSNS) is a spallation neutron research facility being built at Dongguan in Guangdong Province. The 324 MHz Alvarez-type Drift Tube Linac will be used to accelerate the H− ion beam from 3 to 80.0 MeV with peak current 15 mA. The R&D of a prototype structure at the low energy section of DTL is taking place at IHEP. The first unit tank ∼2.8 m in length and 28 drift tubes containing electromagnetic quadrupoles are developed. The SAKAE coils are applied in the fabrication of the electromagnetic quadrupoles. This paper introduces the R&D status of the tank and 28 drift tubes. The fabrication process and measurement results of the electromagnetic quadrupoles of special interest are also presented. 相似文献
13.
After an introduction into the essentials of nuclear fusion reactions, being considered for future energy production in fusion
reactors, different aspects of using “polarized” particles as fuel are discussed. Special emphasis is given to the four-nucleon
system and the D+D reactions. The status of the theory and the experimental data are presented. Predictions for observables
in the framework of existing theoretical approaches are given. The necessity of carrying out direct spin-correlated cross-section
measurements is accentuated. Details of a future experiment are proposed. 相似文献
14.
The Super-FRS will be a large-acceptance two-stage superconducting fragment separator with three exit branches serving different
experimental areas. Due to the high primary-beam intensity of up to 10 12 ions/s a challenging design of the target area and the components used in the first dipole
Super-FRS is necessary. These efforts include high-power production targets, beam-dumps to catch the remaining primary beam,
and radiation resistant magnets. In this contribution we summarize the recent developments on these issues. 相似文献
15.
按照粒子物理标准模型理论,重子数是绝对守恒的.而大统一理论(GUTs)明确地否定了重子数的对称性,预言质子会衰变成更轻的次粒子.文章论述了质子衰变的物理概念、基本探测条件和主要实验现状,并在探测方法的探讨和探测技术的改进方面融入了一些想法.目前一般认为质子的寿命为τp>1032年左右.质子衰变的探测,对于新理论模型的验证、宇宙学和粒子物理学的发展具有重要意义. 相似文献
16.
按照粒子物理标准模型理论,重子数是绝对守恒的.而大统一理论(GUTs)明确地否定了重子数的对称性,预言质子会衰变成更轻的次粒子.文章论述了质子衰变的物理概念、基本探测条件和主要实验现状,并在探测方法的探讨和探测技术的改进方面融入了一些想法.目前一般认为质子的寿命为τp>1032年左右.质子衰变的探测,对于新理论模型的验证、宇宙学和粒子物理学的发展具有重要意义. 相似文献
17.
核聚变能是未来理想的能源。经过半个多世纪的不懈努力,随着国际上一批托卡马克装置成功建设和运行,磁约束聚变研究取得了一系列重大成果,具备了建造和运行反应堆级托卡马克实验装置科学技术和工程建设条件。基于这一共识,世界上一些主要国家共同合作,启动并实施了国际热核聚变实验堆(ITER)计划,希望通过建设和运行ITER,验证和平利用核聚变能的科学技术和工程可行性。中国的托卡马克研究经过近40年的发展取得了很大的进展。未来5年,将建立近堆芯级稳态等离子体实验平台,开展高水平的科学实验;吸收消化、发展与储备聚变工程实验堆关键技术;完善聚变工程实验堆的设计和开展关键部件预研,为在2020年前后独立开展中国聚变工程堆奠定坚实的科学技术基础。 相似文献
18.
We present a review of the Coish model for a non-metric world the points of which are coordinatised by elements from a finite field. The model is brought up to date by introducing recently determined results on the irreducible representations of the special linear group over a finite field due to Tanaka. 相似文献
19.
Atlas is a high-energy, pulsed-power facility under development to study materials properties and hydrodynamics under extreme conditions. Atlas will implode heavy liner loads (m ~ 45 gm) with a peak current of 27-32 MA delivered in 4 μs, and it is energized by 96, 240-kV Marx generators storing a total of 23 MJ. The power-flow system transports current from the Marx generators to the load. It includes a load protection switch to protect the load in case of a prefire; 24 oil-insulated, vertically oriented, radially converging, triplate transmission lines; a transition region that couples the transmission lines to the power-flow channel; and a radially converging, dielectric-insulated, horizontal and conical, power-flow channel. Proposed experiments, the design of the power-flow system, test results, and status are presented 相似文献
20.
The main goal of the SANG project is the creation of a computing system for automatic computation of pseudo and realistic
observables with one-loop precision for various processes of elementary particle interactions. The purpose of this paper is
to outline the SANC project status and next stage plans—SANC2. 相似文献
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