中法核工程与技术学院核声论坛（总第211期）

Abstract:

The discovery of the solar neutrino deficit marked the beginning of neutrino oscillation studies, revealing that neutrinos possess non-zero mass—a key indication of physics beyond the Standard Model. Over the past decades, the Super-Kamiokande (SK) experiment, a 50-kiloton water Cherenkov detector located at the Kamioka Observatory in Japan, has played a pivotal role in advancing our understanding of neutrino oscillations through measurements of solar and atmospheric neutrinos. In this talk, I'll present recent results and progresses about those two neutrinos in SK. 

For solar neutrinos, I will discuss the latest published findings on solar neutrino oscillations, including measurements of the day–night asymmetry and the spectral upturn at low energies. Using over 20 years of data, SK has observed the day–night asymmetry at a significance of 3.2σ, providing compelling evidence for Earth matter effects in the MeV energy region. I will also highlight efforts to lower the detector's energy threshold, which enhances sensitivity to the upturn region. Other interesting topics, such as time variational study and hep solar neutrino detection, will also be discussed.

For atmospheric neutrinos, I will focus on recent advancements that improve the sensitivity to the neutrino mass ordering and oscillation parameter precision. Enhanced reconstruction and particle identification techniques, along with neutron tagging capabilities, enable better separation between neutrinos and antineutrinos and even open possibilities for neutron momentum measurements. These improvements collectively strengthen SK's ability to probe fundamental neutrino properties.

About the speaker：

I'm a senior PhD candidate at Tsinghua University specializing in neutrino experiments. My research interests encompass determining the neutrino mass ordering and CP-violation through oscillation experiments, investigating the nature and mass generation mechanisms of neutrino via neutrinoless double-beta decay, and detecting solar neutrinos to enhance our understanding of stellar processes. 

I'm now focusing on hep solar neutrino analysis at SK, as well as maintaining DAQ system for JNE 1ton prototype detector. Previously I also worked on reconstruction algorithms for both JUNO and JNE based on waveform.