反中微子的超锐共振俘获
Hypersharp Resonant Capture of Anti-Neutrinos
摘要：
最近的想法表明，18.6千电子伏的反中微子（nuebar）线从2体衰变的3 H在晶体中发射的自然宽度，晶格振动在无反冲发射运动变窄。它可以被共振俘获在3 He中，几何截面σ约为10 ^-17 cm 2。一项关键技术解决了实现共振的一个基本障碍--金属中H和He的化学差异。低能量、高σ和超灵敏度Δ E/E ~10^--29使它成为实验室规模测试核θ 13振荡和预测量子引力模型中核能级宽度的普朗克长度极限的一种特殊工具。
英文摘要：
Recent ideas suggest that the 18.6 keV antineutrino (nuebar) line from 2-body decay of 3H in crystals is emitted with natural width, motionally narrowed by lattice vibrations as in recoilless emission. It can be resonantly captured in 3He with geometrical cross section sigma ~10 ^ -17 cm2. A key technique solves a basic obstacle for achieving resonance--the chemical difference of H and He in metals. The low nue energy, the high sigma and the hypersharp sensitivity DELTA E/E ~10^--29 make an extraordinary tool for bench scale tests of nue theta13 oscillations and predicted Planck length limits on nuclear level widths in models of quantum gravity.
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