中国科学院云南天文台特邀学术报告

YNAO Colloquium 2026

第5期

报告题目：Astrophysical questions for gamma ray spectroscopy

主讲人：Prof. Roland Diehl

报告人单位：Max Planck Institut für Extraterrestrische Physik (MPE) and TUM, Garching, Germany

报告语言：English

报告时间：2026年4月29日（星期三）10:30-12:00

报告地点：科研7号楼2楼阶梯教室

主持人：陈雪飞

腾讯会议号：934-916-276

温馨提示：这一周共安排两场特邀报告，分别为4月29日和4月30日，感谢大家的关注和支持。 

报告摘要：

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Astronomy through electromagnetic radiation includes gamma rays at its high-energy end. In this regime beyond thermal processes and of relativistic astrophysics, spectral lines carry unique information about nuclear processes in cosmic environments, and about interactions of relativistic particles such as annihilations with their antiparticles. Characteristic nuclear gamma rays originate from radioactive decays of short-lives isotopes that are by-products of nucleosynthesis reactions in stars and stellar explosions. Annihilation of positrons results in a characteristic gamma-ray spectrum that allows investigations of cosmic sources of positrons. We will discuss how astrophysical questions related to stellar evolution and stellar explosions, and investigations of the interstellar medium with its cosmic relativistic particles, have been stimulated by gamma-ray spectroscopy. We will also address the measurement techniques for cosmic gamma rays and how these could be advanced. 

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报告人简介：

Prof. Roland Diehl obtained his PhD in astrophysics from TU Munich in 1988. He has been teaching at the Munich Technical University since 1998, with a professorship at TU Munich since 2010.  He has been staff scientist at MPE in Garching since 1979. He was elected member of the Senate of the Max Planck Society from 2009 to 2015, and elected member of the German astroparticle physics committee from 2009 to 2022. His science career focused on gamma ray telescope instrumentation in earlier years. As a core member of the COMPTEL instrument team with NASA's Compton Gamma-Ray Space Observatory (1991-2000), and Co-Principal Investigator of the SPI spectrometer instrument on ESA's INTEGRAL space mission (2002-2025), he specialized in gamma-ray line spectroscopy. His science focuses mainly on cosmic nucleosynthesis observations and their interpretation with characteristic gamma-ray lines from radioactive isotopes, but also on spectroscopy from positron annihilation and cosmic-ray interactions. Main interests are the roles of massive stars and their supernovae in cosmic nucleosynthesis, and in the distribution and recycling of matter through the interstellar medium.

主办：中国科学院云南天文台学术委员会

联系人：柳正伟