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arXiv 0905.1029hep-ph
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低能束缚β束共振反中微子诱导电子俘获

Resonant antineutrino induced electron capture with low energy bound-beta beams

R. G. C. Oldeman, M. Meloni, B. Saitta

摘要:

反中微子诱导的电子俘获是一个共振过程,对于单色反中微子束,它可以有一个大的截面。我们计算了这个过程的截面,并研究了一个实验装置,其中单色反中微子产生的束缚β衰变的完全电离的放射性原子在存储环。如果源和目标之间的能量很好地匹配,则横截面可以显著大于常用的非谐振过程的横截面。在$10^3$ kg的源和两个靶之间的小距离处可以实现的速率高达每$8 .3\cdot10^{18}$衰变原子一次相互作用。对于对应于第一个大气中微子振荡最大值的源-靶距离,最大速率是每个$3.2\cdot10^{21}$衰变原子的一个相互作用,只要在未来的离子束中实现极其严格的单色性条件($10^{-7}$或更好)。

英文摘要:

Antineutrino induced electron capture is a resonant process that can have a larg e cross-section for beams of monochromatic antineutrinos. We calculate the cross-section of this process and investigate an experimental setup where monochromatic antineutrinos are produced from the bound-beta decay of fully ionized radioactive atoms in a storage ring. If the energy between the source and the target is well matched, the cross-sections can be significantly larger than the cross-sections of commonly used non-resonant processes. The rate that can be achieved at a small distance between the source and two targets of $10^3$ kg is up to one interaction per $8 .3\cdot10^{18}$ decaying atoms. For a source-target distance corresponding to the first atmospheric neutrino osc illation maximum, the largest rate is one interaction per $3.2\cdot10^{21}$ decaying atoms, provided that extremely stringent monochromaticity conditions ($10^{-7}$ or better) are achieved in future ion beams.

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