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arXiv 0810.2170hep-ph
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电子反中微子的无源共振发射与探测

Recoilless Resonant Emission and Detection of Electron Antineutrinos

W. Potzel

摘要:

本文讨论了~ 3 H-~ 3 He系统中束缚态β衰变单能电子反中微子(Moessbauer反中微子)的无边界共振俘获。无反冲分数包括可能的声子激发,由于当地的晶格膨胀和收缩时的核转变,均匀和非均匀线加宽,和相对论的二阶多普勒效应被认为是。它表明,均匀线加宽是必不可少的,由于随机磁弛豫过程中的金属晶格。非均匀谱线展宽起着同样重要的作用。晶格中3 H和3 He原子的结合能对电子反中微子能量的直接影响导致了共振线的能量移动,这是一个至今被忽视的重要问题。这种能量位移以及二阶多普勒位移在非完美(非均匀)晶格中表现出变化,可能严重危及穆斯堡尔反中微子的观测。尽管有这些巨大的困难,但如果穆斯堡尔反中微子实验成功的话,它可以用来对中微子振荡的性质获得新的和深入的了解,确定中微子质量等级以及迄今为止未知的振荡参数,寻找不育中微子,并测量地球场中电子反中微子的引力红移。

英文摘要:

Recoilless resonant capture of monoenergetic electron antineutrinos (Moessbauer antineutrinos) emitted in bound-state beta-decay in the system 3H - 3He is discussed. The recoilfree fraction including a possible phonon excitation due to local lattice expansion and contraction at the time of the nuclear transition, homogeneous and inhomogeneous line broadening, and the relativistic second-order Doppler effect are considered. It is demonstrated that homogeneous line broadening is essential due to stochastic magnetic relaxation processes in a metallic lattice. Inhomogeneous line broadening plays an equally important role. An essential issue which has been overlooked up to now, is an energy shift of the resonance line due to the direct influence of the binding energies of the 3H and 3He atoms in the lattice on the energy of the electron antineutrinos. This energy shift as well as the second-order Doppler shift exhibit variations in a non-perfect (inhomogeneous) lattice and may seriously jeopardize the observation of Moessbauer antineutrinos. If successful in spite of these enormous difficulties, Moessbauer antineutrino experiments could be used to gain new and deep insights into the nature of neutrino oscillations, determine the neutrino mass hierarchy as well as up to now unknown oscillation parameters, search for sterile neutrinos, and measure the gravitational redshift of electron antineutrinos in the field of the Earth.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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