搜索到21767篇“ GEV“的相关文章
超过30 GeV的强激光锁相直接电子加速
2024年
当超强激光斜入射辐照固体时,预脉冲会先将固体表面等离子体化,随后主脉冲将与等离子体相互作用并最终被等离子体反射.同时,等离子体中的部分电子将锁定在激光场的加速位相,随后在激光场中获得有效加速,该过程被称为锁相电子加速.由于目前超强激光的电场强度已接近TV/m量级,因此如果电子在激光场加速位相中停留足够长的时间,便有可能获得百GeV甚至TeV量级的能量.本文针对现有的超强激光参数,通过单电子动力学模型,对锁相机制中电子在激光场的加速过程展开系统研究.研究结果表明,峰值功率为10 PW量级的强激光可将电子直接加速至30 GeV左右.本研究还给出了锁相加速机制中锁相电子的远场能量角分布,以及最终能量等与激光场强度的定标关系.考虑到激光强度的不断提高并且激光锁相电子加速机制也适用于正电子加速,因此本研究结果将有望应用于小型化正负电子对撞机及高能伽马射线源等领域.
朱翰辰周楚亮李晓锋田野田野
关键词:正负电子对撞机
质心系能量200 GeV下Au-Au碰撞中的轻核产生
2024年
STAR实验组最新发布的氘、氚等一系列实验数据,为轻核产生机制的理论研究提供了新机遇.利用核子重组合模型,系统研究质心系能量200 GeV下Au-Au碰撞中氘、氚、^(3)He的横动量谱、产额快度密度以及平均横动量.氘、氚的理论计算结果能够自洽描述其最新实验数据,^(3)He的理论预言为相对论重离子对撞机(RHIC)实验进一步测量提供理论依据.研究结果表明,核子重组合是RHIC高能区Au-Au碰撞中氘、氚、^(3)He等轻核的主要产生来源.
乔姜禾高邓浩王瑞芹邵凤兰
GeV重离子束辐照LiF引起的晶体内部结构改变
2024年
高能强流重离子束入射到固体物质中,沿飞行路径的离子能量沉积密度将改变宏观靶物质的温度和压强等,并可能在高压高密条件下产生新的材料缺陷.本文利用兰州重离子加速器装置HIRFL-CSR引出的能量为264 MeV/u的Xe^(36+)离子束,入射到LiF晶体靶物质中,在线测量了LiF的发射光谱,观测到沿离子路径的晶体颜色变化.通过解离方法取得了不同位置处的X射线衍射(X-ray Diffraction)与X射线光电子能谱结果,显示在Xe离子的布拉格峰区域出现了LiF_(3)(LiF+F_(2))结构相,讨论了新的结构缺陷的产生与重离子束能量沉积密度间可能的相关性.这为离子束驱动的高能量密度物理的能量沉积过程提供了一定参考.
陈宇鹏史路林王瑜玉程锐程锐陈良文杨杰董俊煜
关键词:LIF晶体重离子束能量密度色心
质心能量7.7 GeV下Au+Au碰撞中初始密度涨落对累积矩的影响
2024年
重离子碰撞中的密度涨落效应及其对观测量的影响是核物理研究领域的一个重要方向。本文利用极端相对论量子分子动力学(UrQMD)模型,通过改变初始化时两个核子之间的最小距离d_(min),讨论了碰撞能量/S_(NN)=7.7GeV下Au+Au碰撞中初始密度涨落对净质子多重数分布累积矩的影响。结果发现,当d_(min)从1.6fm减小到1.0 fm时,坐标空间中初态密度涨落增大。在火球膨胀阶段,d_(min)引起的初始密度涨落效应对累积矩的影响逐渐减弱,平均场的效应逐渐显著。在末态的动量空间中,较小的赝快度窗口(Δ_(η)≤4)下初态密度涨落对净质子数分布涨落的影响较小;然而在一个较大的赝快度窗口下(Δ_(η)>4),其对净质子数的累积矩比值有着较为明显的影响,在半中心碰撞(b=5 fm)中,d_(min)所带来的的影响大约为平均场所带来影响的2~3倍。
岳晓清李鹏程王永佳李庆峰刘福虎
关键词:重离子碰撞
95 GeV light Higgs in the top-pair-associated diphoton channel at the LHC in the minimal dilaton model
2024年
Motivated by experimental hints and theoretical frameworks indicating the existence of an extended Higgs sector,we explore the feasibility of detecting a 95 GeV light Higgs boson decaying into a diphoton within the minimal dilaton model at the 14 TeV LHC.Initially,we identify the correlations between the production cross section,decay branching ratios,and model parameters,e.g.,the scalar mixing angle■Subsequently,we utilize Monte Carlo simulations to generate the signal of the light Higgs boson via the■process,along with the corresponding backgrounds.To effectively separate the signal from the dominant backgrounds■,we employ a meticulous cut-based selection process.Ultimately,we find that with an integrated luminosity of L=3000fb^(-1),the regions of■can be covered over the3σlevel.
王坤朱经亚
关键词:LHC
RHIC-STAR 7.7 GeV和9.2 GeV金金碰撞中奇异粒子椭圆流的实验研究
王国平
Morphology Study for GeV Emission of Nearby Supernova Remnant G332.5-5.6
2024年
A spatial template is important to study nearby supernova remnants(SNRs).For SNR G332.5-5.6,we report a Gaussian disk with a radius of about 1°.06 to be a potential good spatial model in the γ-ray band.Employing this new Gaussian disk,its GeV lightcurve shows a significant variability of about seven sigma.The γ-ray observations of this SNR could be explained well either by a leptonic model or a hadronic model,in which a flat spectrum for the ejected electrons/protons is required.
Ming-Hong LuoQing-Wen TangXiu-Rong Mo
关键词:GAMMA
The acceleration of a high-charge electron bunch to 10 GeV in a 10-cm nanoparticle-assisted wakefield accelerator被引量:1
2024年
An intense laser pulse focused onto a plasma can excite nonlinear plasma waves.Under appropriate conditions,electrons from the background plasma are trapped in the plasma wave and accelerated to ultra-relativistic velocities.This scheme is called a laser wakefield accelerator.In this work,we present results from a laser wakefield acceleration experiment using a petawatt-class laser to excite the wakefields as well as nanoparticles to assist the injection of electrons into the accelerating phase of the wakefields.We find that a 10-cm-long,nanoparticle-assisted laser wakefield accelerator can generate 340 pC,10±1.86 GeV electron bunches with a 3.4 GeV rms convolved energy spread and a 0.9 mrad rms divergence.It can also produce bunches with lower energies in the 4–6 GeV range.
Constantin AniculaeseiThanh HaSamuel YoffeLance LabunStephen MiltonEdward McCaryMichael M.SpinksHernan J.QuevedoOu Z.LabunRitwik SainAndrea HannaschRafal ZgadzajIsabella PaganoJose A.Franco-AltamiranoMartin L.RinguetteErhart GaulScott V.LuedtkeGanesh TiwariBernhard ErsfeldEnrico BrunettiHartmut RuhlTodd DitmireSandra BruceMichael E.DonovanMichael C.DownerDino A.JaroszynskiBjorn Manuel Hegelich
关键词:ACCELERATIONNANOPARTICLECHARGE
江门中微子实验亚GeV能段的精确能量重建研究
张思远
Different coalescence sources of light nucleus production in Au-Au collisions at √sNN=3 GeV
2024年
We study the production of light nuclei in the coalescence mechanism of Au-Au collisions at midrapidity at √sNN=3GeV.We derive analytic formulas of the momentum distributions of two bodies,three bodies,and four nucleons coalescing into light nuclei and naturally explain the transverse momentum spectra of the deuteron(d),triton(t),helium-3(3He),and helium-4(4He).We reproduce data on the yield rapidity densities,yield ratios,and averaged transverse momenta of d,t,3He,and 4He and provide the proportions of contributions from different coalescence sources for t,3He,and 4He in their production.We find that besides nucleon coalescence,nucleon+nucleus coalescence and nucleus+nucleus coalescence may play requisite roles in light nucleus production in Au-Au collisions at √sNN=3 GeV.
王瑞芹吕济鹏李彦豪宋军邵凤兰

相关作者

张东海
作品数:76被引量:43H指数:5
供职机构:山西师范大学
研究主题:核乳胶 MEV 多重数 O 射弹碎片
萨本豪
作品数:75被引量:27H指数:3
供职机构:中国原子能科学研究院
研究主题:核-核碰撞 相互作用 QGP GEV 重离子碰撞
孙建新
作品数:9被引量:2H指数:1
供职机构:山西大同大学物理与电子科学学院
研究主题:赝快度分布 GEV 赝快度 NN 碰撞
姜志进
作品数:33被引量:42H指数:3
供职机构:上海理工大学理学院
研究主题:赝快度分布 末态 GLAUBER模型 带电粒子 高能重离子碰撞
王婷婷
作品数:2被引量:0H指数:0
供职机构:中国科学院上海应用物理研究所
研究主题:GEV BLAS AU 重离子碰撞 T-WAVE