Development of the detection of the neutrino magnetic moment using transitoin radiation

利用跃迁辐射探测中微子磁矩的进展

基本信息

项目摘要

In the standard model with the right-handed neutrino singlet (nu_R) the magnetic moment of the neutrino is estimated to be negligibly small : mu_<nu>=(3*10^<-19>m_<nu>)mu_B, where m_<nu> is the neutrino mass in units of eV and mu_B is the electron Bohr magneton. Thus, the existence of a neutrino magnetic moment at an order of 10^<-10> mu_B would require a modification of the standard model of the electro-weak interaction. The existing experimental upper bounds on the neutrino magnetic moment are still weak : mu(nu_e)<10^<-9>mu_B, mu(nu_<mu>)<10^<-9>mu_B, and mu(nu_r)<10^<-6>mu_B at the 90% CL.These experimental searches have been performed using the process of neutrino-electron elastic scattering and the e^+e^-*gammanunu^^- process. One of us recently proposed a new method to measure the neutrino magnetic moment using the transition radiation. Transition radiation is a well established electromagnetic phenomenon. It should also be produced when the neutrino with a magnetic moment cross … More es the interface between two different media. The probability of the radiation is about 10^<-12> (mu_<nu>/mu_B)^2 per interface and the energy spectrum of the radiation is uniform up to gammaomega_1, where gamma is the Lorentz factor of the neutrino (gamma=E_<nu>/m_<nu>) and omega_1 is the plasma frequency of the medium. It is noted that the energy intensity depends explicitly on the neutrino mass and that the energy emitted is as large as the incident neutrino energy depending on the neutrino mass. The experiment uses the reactor neutrinos with flux of F_<nu>=10^<13>nu^^-_e/cm^2/sec. We propose a detector consisting of a radiator with N Mylar films (area=100m^2, N-5x10^3, omega_1=20eV and thickness l_1=0.1mm) stretched in air (omega_2=0.8eV and spacing l_2=1mm). The produced gamma rays are detected by the 100 sets of scintillator strips. The energy and the direction of the gamma rays are reconstructed by using the multi-Comptom scattering events. The detection efficiency is estimated to be 48%, and the energy resolution and the angular resolution are estimated to be about 14% and 2.5 degrees. The experiment can reach mu_<nu> -5・10^<-9>mu_B after 1 year of data-taking. Less
在右手中微子单线态 (nu_R) 的标准模型中,中微子的磁矩估计小到可以忽略不计:mu_<nu>=(3*10^<-19>m_<nu>)mu_B,其中 m_<nu> 是以 eV 为单位的中微子质量,mu_B 是电子玻尔磁子。因此,10^-10μ_B量级的中微子磁矩的存在需要对电弱相互作用的标准模型进行修改。现有的中微子磁矩实验上限仍然很弱:90% CL 下的 mu(nu_e)<10^<-9>mu_B、mu(nu_<mu>)<10^<-9>mu_B 和 mu(nu_r)<10^<-6>mu_B。这些实验搜索是使用中微子电子弹性散射过程和 e^+e^-*gammanunu^^- 过程。我们中的一个人最近提出了一种利用跃迁辐射测量中微子磁矩的新方法。跃迁辐射是一种成熟的电磁现象。当具有磁矩的中微子穿过两种不同介质之间的界面时,也会产生它。每个界面的辐射概率约为 10^<-12> (mu_<nu>/mu_B)^2,并且辐射的能谱在 gammaomega_1 之前是均匀的,其中 gamma 是中微子的洛伦兹因子 (gamma=E_<nu>/m_<nu>),omega_1 是介质的等离子体频率。值得注意的是,能量强度明显取决于中微子质量,并且发射的能量与取决于中微子质量的入射中微子能量一样大。实验使用的反应堆中微子通量为F_<nu>=10^<13>nu^^-_e/cm^2/sec。我们提出了一种由散热器组成的探测器,该散热器具有在空气中拉伸的 N 个聚酯薄膜(面积=100m^2,N-5x10^3,omega_1=20eV,厚度 l_1=0.1mm)(omega_2=0.8eV,间距 l_2=1mm)。产生的伽马射线由 100 组闪烁体条检测。利用多康通散射事件重建伽马射线的能量和方向。探测效率估计为48%,能量分辨率和角分辨率估计约为14%和2.5度。经过1年的数据采集,实验可以达到mu_<nu> -5・10^<-9>mu_B。较少的

项目成果

期刊论文数量(0)
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SAKUDA Makoto其他文献

SAKUDA Makoto的其他文献

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{{ truncateString('SAKUDA Makoto', 18)}}的其他基金

Development of Neutrino-Nucleus Interactions From MeV to GeV Energy Region
中微子-原子核相互作用从 MeV 到 GeV 能量区域的发展
  • 批准号:
    18340066
  • 财政年份:
    2006
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study of neutrino-nucleus interactions using a near detector for the neutrino oscillation experiment
使用近探测器进行中微子振荡实验研究中微子-核相互作用
  • 批准号:
    15540299
  • 财政年份:
    2003
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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