A possible detection of the cosmic antineutrino background in the presence of flavor effects

A possible detection of the cosmic antineutrino background in the presence of flavor effects
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在存在风味效应的情况下可能检测宇宙反中微子背景

DOI:
10.1016/j.physletb.2011.03.044
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发表时间:
2011-02
期刊:
影响因子:
4.4
通讯作者:
--
中科院分区:
物理与天体物理2区
文献类型:
--
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Lusignoli和Vignati最近指出,利用相当稳定的同位素163 Ho作为靶,原则上可以直接探测宇宙反中微子背景(C B),它可以通过电子捕获(EC)衰变为163 Dy,释放的能量非常小。本文在考虑不同中微子质量等级和θ13合理值的情况下,计算了163 Ho核的残余反中微子俘获率与相应的EC衰变率的关系。我们表明,这种风味效应是明显的,甚至在某些情况下是重要的,并强调,在遥远的将来,C B的量热测量可能是可行的。
Lusignoli and Vignati have recently pointed out that it is in principle possible to directly detect the cosmic antineutrino background (Cν¯B) by using the rather stable isotope163Ho as a target, which can decay into163Dy via electron capture (EC) with a very small energy release. In this Letter we calculate the rate of the relic antineutrino capture on163Ho nuclei against the corresponding EC decay rate by taking account of different neutrino mass hierarchies and reasonable values of θ13. We show that such flavor effects are appreciable and even important in some cases, and stress that a calorimetric measurement of the Cν¯B might be feasible in the far future.
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