学术报告（ 5月24日 周四 下午 16:00-17:00）

主持人：Dr. Neill Raper （王为教授博后）

欢迎广大师生前来参与！

【摘要】

The Daya Bay (DB) reactor neutrino experiments confirm the “reactor neutrino anomaly” in that the measured value of \sigma_f is about 5.1% below that predicted by the model spectra of Huber and Mueller (H-M). Such anomaly could be potentially extremely important for the possible existence of sterile neutrino. Thus, extensive recent literature appears, to study the origin of the anomaly.

In this talk, I would like to discuss some topic related to the uncertainties of the antineutrino spectra. To obtain the antineutrino spectra theoretically,  so-called summation method or by the conversion method can be used. For both methods, all corrections to β decay that can affect the spectra at the few percent level are normally included. There are four subdominant corrections to β decay that must be considered in calculating the antineutrino spectra. These are the recoil, radiative, finite-size, and weak magnetism corrections. The recoil correction is quite small, and the radiative correction has been taken from the work of Sirlin, both before and since the occurrence of the anomaly. In all cases, the finite-size and weak magnetism corrections that were applied involve some level of approximation. We have checked the validity of the nuclear structure assumption, particularly for allowed fission-fragment β decays.

I would also introduce our recent work of the analysis of the Daya Bay Reactor antineutrino flux changes with fuel burnup. We find that the discrepancy between current model predictions and the Daya Bay results can be traced to the original measured 235U/239Pu ratio of the fission β spectra that were used as a base for the expected antineutrino fluxes. We conclude that there is currently not enough information to use the antineutrino flux changes to rule out the possible existence of sterile neutrinos. The concept of finite structure of the antineutrino spectra from a Nuclear Reactor will also be talked briefly.

【个人简介】

王小保教授，2007年本科毕业于北京大学bet亚洲登录官方网站物理学专业，2012年获北京大学博士学位。2012年-2014年在芬兰于韦斯屈莱大学从事博士后研究工作；2015-2016年在美国洛斯阿拉莫斯国家实验室做访问学者；目前，作为高层次引进人才在湖州师范学院理学院工作。迄今，在国内外本领域高水平期刊上发表论文21篇，近三年来主持国家基金项目3项，先后获得湖州市青年科技奖、浙江省高等学校中青年学科带头人等荣誉称号。