Retrieval of energy spectra for all flavours of neutrinos from core-collapse supernova with multiple detectors
Retrieval of energy spectra for all flavours of neutrinos from core-collapse supernova with multiple detectors
复制标题
DOI：
10.1093/mnras/staa3287
复制
发表时间：
2020-08
影响因子：
4.8
通讯作者：
H. Nagakura
中科院分区：
文献类型：
--
作者：
H. Nagakura
提出了一种从核坍缩超新星(CCSN)中提取各种中微子能谱的新方法。在反演过程中，我们不假设任何解析式来表示中微子的能谱，而是直接从观测数据重建谱；采用奇异值分解算法和新开发的自适应能量网格技术。我们使用了三个独立的反应通道，它们对中微子具有不同的风味敏感性。采用了两个反应通道：质子的逆β衰变和电子的弹性散射，它们分别来自超级神冈(SK)和超神冈(HK)的水-切伦科夫探测器，以及来自深地中微子实验(DUNE)的Ar的带电电流反应通道。在给定中微子振荡模型的情况下，我们迭代搜索CCSN源的中微子能谱，直到它们在三个反应通道中提供一致的事件计数。我们通过对最近的三维CCSN模拟计算的理论中微子数据进行光谱恢复来测试我们方法的能力。尽管CCSN源的电子型或电子型反中微子的能谱与其他物种的能谱相比有较大的误差，但与HK+沙丘或SK+沙丘的联合分析将提供源中所有类型中微子的精确能谱。最后，我们讨论了利用其他探测器的中微子数据改进我们的方法的前景。
We present a new method by which to retrieve energy spectrum for all flavor of neutrinos from core-collapse supernova (CCSN). In the retrieval process, we do not assume any analytic formulae to express the energy spectrum of neutrinos but rather take a direct way of spectrum reconstruction from the observed data; the Singular Value Decomposition algorithm with a newly developed adaptive energy-gridding technique is adopted. We employ three independent reaction channels having different flavor sensitivity to neutrinos. Two reaction channels, inverse beta decay on proton and elastic scattering on electrons, from a water Cherenkov detector such as Super-Kamiokande (SK) and Hyper-Kamiokande (HK), and a charged current reaction channel with Argon from the Deep Underground Neutrino Experiment (DUNE) are adopted. Given neutrino oscillation models, we iteratively search the neutrino energy spectra at the CCSN source until they provide the consistent event counts in the three reaction channels. We test the capability of our method by demonstrating the spectrum retrieval to a theoretical neutrino data computed by our recent three-dimensional CCSN simulation. Although the energy spectrum with either electron-type or electron-type anti-neutrinos at the CCSN source has relatively large error compared to that of other species, the joint analysis with HK + DUNE or SK + DUNE will provide precise energy spectrum of all flavors of neutrinos at the source. Finally, we discuss perspectives for improvements of our method by using neutrino data of other detectors.