中国古代埋藏树木年轮中公元前 3372-3371 年宇宙射线的快速增加。

A rapid cosmic-ray increase in BC 3372-3371 from ancient buried tree rings in China.

机构信息

School of Astronomy and Space Science, Nanjing University, Nanjing, 210023, China.

Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing, 210023, China.

出版信息

Nat Commun. 2017 Nov 14;8(1):1487. doi: 10.1038/s41467-017-01698-8.

DOI:10.1038/s41467-017-01698-8

PMID:29133840

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5684315/

Abstract

Cosmic rays interact with the Earth's atmosphere to produce C, which can be absorbed by trees. Therefore, rapid increases of C in tree rings can be used to probe previous cosmic-ray events. By this method, three C rapidly increasing events have been found. Plausible causes of these events include large solar proton events, supernovae, or short gamma-ray bursts. However, due to the lack of measurements of C by year, the occurrence frequency of such C rapidly increasing events is poorly known. In addition, rapid increases may be hidden in the IntCal13 data with five-year resolution. Here we report the result of C measurements using an ancient buried tree during the period between BC 3388 and 3358. We found a rapid increase of about 9‰ in the C content from BC 3372 to BC 3371. We suggest that this event could originate from a large solar proton event.

摘要

宇宙射线与地球大气相互作用产生 14C，它可以被树木吸收。因此，树木年轮中 14C 的快速增加可以用来探测以前的宇宙射线事件。通过这种方法，已经发现了三个 14C 快速增加的事件。这些事件的可能原因包括大型太阳质子事件、超新星或短伽马射线暴。然而，由于缺乏每年 14C 的测量，这种 14C 快速增加事件的发生频率知之甚少。此外，快速增加可能隐藏在具有五年分辨率的 IntCal13 数据中。在这里，我们报告了使用一棵古代埋藏树木在公元前 3388 年至 3358 年期间测量 14C 的结果。我们发现 14C 含量从公元前 3372 年到公元前 3371 年快速增加了约 9‰。我们认为，该事件可能源自一次大型太阳质子事件。