| 报告题目： |
Signature of collapsar as sources for High-energy neutrinos and r-process nuclei |
| 报告人： |
郭刚 教授 |
| 报告人单位： |
中国地质大学（武汉） |
| 报告时间： |
2023年6月1日（周四）上午10:00-11:30 |
| 报告地点： |
精密重力测量科学中心大楼W510会议室 |
| 邀请人： |
周恩平 副教授 |
| 报告摘要： |
If collapsars are sources for both high-energy (HE) neutrinos and r-process nuclei, the profuse low-energy antineutrinos from beta-decay of the newly-synthesized nuclei can annihilate the HE neutrinos. Considering HE neutrinos produced at internal shocks induced by intermittent mildly-magnetized jets, we show that such annihilation suppresses the overall HE neutrino spectrum above 300 TeV and produces a flavor composition dominated by muon-neutrinos at source. We find that the emergent HE neutrino flux can well fit the diffuse flux observed at IceCube if contributions from all similar sources are taken into account. Our results highlight the unique role of HE neutrinos in supporting collapsars as sources for r-process nuclei, and can be tested by detection of HE neutrinos from individual sources and accurate measurement of the diffuse HE neutrino flux spectrum and flavor composition. |
| 报告人简介： |
郭刚，中国地质大学（武汉）特任教授。2016年毕业于上海交通大学，获理学博士学位，随后赴德国亥姆霍兹重离子研究中心(GSI)和中国台湾中研院从事博士后研究工作。2021年4月入职中国地质大学（武汉）。主要从事中微子和核天体物理方面的研究，目前已在PRD、JHEP和ApJ等刊物上发表论文十余篇，论文他引次数一千余次。 |
| 参会人员： |
全体师生 |
