用LENA探测弥漫超新星中微子背景
Detecting the Diffuse Supernova Neutrino Background with LENA
摘要：
LENA（低能中微子天文学）已被提出作为下一代50 kt液体闪烁体探测器。它的大目标质量允许搜索弥漫超新星中微子背景（DSNB），这是由整个宇宙中所有核心坍缩超新星的累积排放产生的。来自反应堆和大气电子反中微子的不可区分的背景限制了检测窗口到9.5 MeV和25 MeV之间的能量范围。根据超新星中微子的平均能量，在这个能量窗口中，预计每年大约有5到10个事件。大气中微子的中性流反应本底比DSNB高出一个数量级以上，但可以通过脉冲形状鉴别加以抑制。假设剩余背景已知，具有5%的不确定性，DSNB可以在10年的数据采集后以2 sigma显著性检测到。如果没有看到信号的提示，则当前标准DSNB模型将被排除，其具有超过90%的C.L.
英文摘要：
LENA (Low Energy Neutrino Astronomy) has been proposed as a next generation 50 kt liquid scintillator detector. Its large target mass allows to search for the Diffuse Supernova Neutrino Background (DSNB), which was generated by the cumulative emissions of all core-collapse supernovae throughout the universe. Indistinguishable background from reactor and atmospheric electron antineutrinos limits the detection window to the energy range between 9.5 MeV and 25 MeV. Depending on the mean supernova neutrino energy, about 5 to 10 events per year are expected in this energy window. The background from neutral current reactions of atmospheric neutrinos surpasses the DSNB by more than one order magnitude, but can be suppressed by pulse shape discrimination. Assuming that the residual background is known with 5% uncertainty, the DSNB can be detected with 2 sigma significance after 10 years of data taking. In case that no hint for a signal is seen, current standard DSNB models would be ruled out with more than 90% C.L.
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