用KM3NeT/ORCA测量中微子质量等级的前景
Prospects for measuring the neutrino mass hierarchy with KM3NeT/ORCA
摘要:
ORCA(Oscillation Research with Cosmics in the Abyss)是KM 3 NeT的低能量分支,KM 3 NeT是下一代研究基础设施,在地中海托管水下切伦科夫探测器。ORCA的主要目标是通过测量物质引起的对几个GeV大气中微子振荡概率的修改来确定中微子质量等级。ORCA探测器设计预见了KM 3 NeT中微子探测技术的密集配置,优化用于测量3 - 20 GeV能量范围内的中微子相互作用。ORCA的多光电倍增管光学模块将部署在法国的KM 3 NeT站点,利用深海水的优异光学特性,准确地重建类中微子(主要是电子中微子)和类径迹(主要是μ子中微子)事件,以收集几个GeV中微子事件的高统计样本。本文综述了ORCA探测器的方法和技术,讨论了测量中微子质量等级的前景以及提高其他振荡参数测量精度的潜力。
英文摘要:
ORCA (Oscillation Research with Cosmics in the Abyss) is the low-energy branch of KM3NeT, the next-generation research infrastructure hosting underwater Cherenkov detectors in the Mediterranean Sea. ORCA's primary goal is the determination of the neutrino mass hierarchy by measuring the matter-induced modifications on the oscillation probabilities of few-GeV atmospheric neutrinos. The ORCA detector design foresees a dense configuration of KM3NeT neutrino detection technology, optimised for measuring the interactions of neutrinos in the energy range of 3 - 20 GeV. To be deployed at the French KM3NeT site, ORCA's multi-PMT optical modules will exploit the excellent optical properties of deep-sea water to accurately reconstruct both shower-like (mostly electron neutrino) and track-like (mostly muon neutrino) events in order to collect a high-statistics sample of few-GeV neutrino events. This contribution reviews the methods and technology of the ORCA detector, and discusses the prospects for measuring the neutrino mass hierarchy as well as the potential to improve the measurement precision on other oscillation parameters.
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