2020-08-20 晨读系列 - "Searching for

1. searching for supernova neutrinos with DUNE [2]

很喜欢读费米的每日新闻。这一篇讲的是来自超新星的中微子。

DUNE scientists will study streams of neutrinos emitted by exploding stars. DUNE’s unique strength is its sensitivity to a particular type of neutrino called the electron neutrino, which will provide scientists with supernova data not available from any other experiment. Image: Fermilab

2. 细读原文[1]：

从上图[1]来看，原来这一切，都发生在很短的时间间隔。这对探测器的时间分辨有比较高的要求。要看到“core bounce” 阶段，时间分辨要达到 0.01 秒的量级才行呢。LAMOST，拍摄的是分钟级别的照片，只能看出时间累积后的结果。

- 中微子的能量，在 0 - 50 MeV 范围，主要在 〜 10 MeV。

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- Expected Events

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Questions:

- How often do we expect to see a supernova explosion in the milky way galaxy? We were lucky to see two dozen neutrinos from the 1987A supernova. If we expect 1 explosion in about 100 years, it might be a very long wait before we catch the next one.

Reference:

[1]. "Supernova Neutrino Burst Detection with the Deep Under ground Neutrino Experiment".  https://arxiv.org/pdf/2008.06647.pdf

[2]. DUNE： Deep Underground Neutrino Experiment.