KamLAND's search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube
S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ish… 展开作者
S. Abe, S. Asami, M. Eizuka, S. Futagi, A. Gando, Y. Gando, T. Gima, A. Goto, T. Hachiya, K. Hata, K. Hosokawa, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, T. Kinoshita, M. Koga, M. Kurasawa, N. Maemura, T. Mitsui, H. Miyake, T. Nakahata, K. Nakamura, K. Nakamura, R. Nakamura, H. Ozaki, T. Sakai, H. Sambonsugi, I. Shimizu, J. Shirai, K. Shiraishi, A. Suzuki, Y. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, Y. Yoshida, S. Obara, A. K. Ichikawa, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, S. N. Axani, J. Smolsky, J. Lertprasertpong, L. A. Winslow, Z. Fu, J. Ouellet, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, A. Li, J. A. Detwiler, S. Enomoto, M. P. Decowski, C. Grant, H. Song, T. O'Donnell, S. Dell'Oro
We report the results of a search for MeV-scale astrophysical neutrinos in KamLAND presented as an excess in the number of coincident neutrino interactions associated with the publicly available high-energy neutrino datasets from the IceCube Neutrino Observatory. We find no statistically significant excess in the number of observed low-energy electron antineutrinos in KamLAND, given a coincidence time window of $\pm$500s, $\pm$1,000s, $\pm$3,600s, and $\pm$10,000s around each of the IceCube neutrinos. We use this observation to present limits from 1.8 MeV to 100 MeV on the electron antineutrino fluence, assuming a mono-energetic flux. We then compare the results to several astrophysical measurements performed by IceCube and place a limit at the 90% confidence level on the electron antineutrino isotropic thermal luminosity from the TXS 0506+056 blazar.
Limits on astrophysical antineutrinos with the KamLAND experiment
我们报告的电子反中微子($\barν_e$)的中微子能量范围为8.3至30.8 MeV的KamLAND探测器从天体物理源的搜索。在6.72 kton-年的液体闪烁体照射中,我们通过逆β衰变反应观测到18个候选事件。虽然有一个很大的背景不确定性,从中性电流大气中微子相互作用,我们发现没有显着超过背景模型的预测。假设有几个超新星遗迹中微子谱,我们给出了分析范围内60- 110 cm $^{-2}$ s $^{-1}$(90%CL)的通量上限,并给出了一个与模型无关的通量。我们还对轻暗物质对到中微子对的湮灭率设定了限制。这些数据提高了$^{8}$ B太阳中微子转换成$\barν_e$的概率上限,$P_{ν_e \rightarrow \barν_e} < 3.5\times10^{-5}$(90% CL)假定为无畸变的$\barν_e$形状。这相当于在分析能量范围内太阳$\barν_e$通量为60 cm $^{-2}$ s $^{-1}$(90% CL)。
Search for Diffuse Supernova Neutrino Background in the Full KamLAND Dataset with Neural-Network-Based Event Classification
Research Center for Neutrino Science, Tohoku University(东北大学中微子科学研究中心);Department of Human Science, Obihiro University of Agriculture and Veterinary Medicine(带广畜产大学人类科学学院)
Analysis of the 4-year IceCube high-energy starting events
经过四年的数据采集,冰立方中微子望远镜已经探测到54个高能起始事件(HESE,或包含顶点事件),其沉积能量超过20 TeV。它们代表了有史以来第一次探测到高能地外中微子,因此也是中微子天文学的第一步。为了研究到达地球的天体物理中微子流的能量、味道和各向同性,我们对两个不同的沉积能量区间[10 TeV $-$ 10 PeV]和[60 TeV $-$ 10 PeV]进行了不同的分析。我们首先考虑一个各向同性不间断的幂律谱,并限制其形状,归一化和风味成分。我们的结果与初步的IceCube结果一致,尽管我们得到了稍微柔和的光谱。我们还发现,目前的数据是不敏感的天体物理通量中可能的中微子反中微子不对称性。然后,我们表明,虽然两个组件的幂律模型导致一个稍微好一点的拟合,它并不代表一个显着的改善相对于一个单一的幂律通量。最后,我们分析了可能存在的南北不对称性,暗示的HESE样本与贯穿的μ子数据相结合。如果只使用HESE数据,来自北半球的稀缺统计数据不允许我们得出任何结论性的答案,这表明HESE样本本身并不能驱动潜在的南北不对称。
Matter- and magnetically-driven flavor conversion of neutrinos in magnetorotational collapses
Università del Salento(萨莱诺大学);INFN-Istituto Nazionale di Fisica Nucleare, Sezione di Lecce(意大利国家核物理研究所莱切分部);Niels Bohr International Academy and DARK, Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯·玻尔学院及DARK中心)