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郭硕鸿讲座十五(4月12日 周五 10:00-11:30)

报告人: 
曹臻 研究员(中国科学院高能物理研究所)
题目: 
LHAASO Status and High Precision Measurement of Energy Spectra of CR Species
地点: 
(南校园)十友堂300室
时间: 
2019年4月12日 10:00 – 11:30

主 持 人:王为 教授

欢迎广大师生前来参与!

 

[摘要]

Galactic Cosmic ray (CR) origin is still a mystery. Measuring the knees of the CR spectra for individual species with high precision is a very important approach to solve the problem. ARGO-YBJ and LHAASO-WFCTA combined experiment made the first step by measuring the spectrum of hydrogen plus helium nuclei and finding the knee around 0.7 PeV. The combination of one of the water Cherenkov detector and 6 wide FoV Cherenkov telescopes is an enhanced apparatus for this measurement. The key is to separate protons from all CR samples. A multi variate analysis (MVA) approach for the CR composition analysis in LHAASO experiment is developed for the purpose of measuring the knee of proton spectrum. The proton plus helium spectrum can be measured up to 10 PeV using the similar technique. The indication of the knee of helium spectrum is also expected. The knees of the spectra of heavy nuclei are believed to be above 10 PeV implied by the previous experiment, such as ARGO-YBJ and LHAASO-WFCTA. The whole 1 km2 array combining with 18 telescopes in LHAASO also has a suitable size for the measurement with the required precision. We have identified a couple of variables that are sensitive to the composition of showers. The efficiency and the purity of the selection for demanded species are optimized by well configuring the LHAASO array using the LHAASO simulation tools. Preliminary results of the analysis and expectations are presented. The LHAASO construction status is updated in the presentation, too.

 

[报告人简介]

  1. 2013年至今,任国家重大科技基础设施项目“高海拔宇宙线观测站”首席科学家、工程建设经理部经理
  2. 2012年至今,任粒子天体物理中心副主任、中科院粒子天体物理重点实验室副主任

学术活动及兼职(亮点):

  1. 2004年至今,任中意合作ARGO‐YBJ 实验中方发言人,承担基金委重大国际合作项目“羊八井全覆盖阵列及其天体粒子物理学研究(2001‐ 2007)”;973项目“粒子物理和地质力学若干前沿研究(2003‐2007)”等项目负责人,承担基金委重点项目“利用羊八井宇宙线实验开展粒子天体物理研究(2009‐2012)”,任项目负责人
  2. 2008年,提出“高海拔宇宙线观测站(LHAASO)”研究计划, 主持相关预先研究项目
  3. 2013年,“高海拔宇宙线观测站”列入国务院《国家重大科技基础设施建设中长期规划》,并选为16个优先资助项目,自此负责项目立项准备工作,包括负责中科院的重要方向性项目“LHAASO预先研究”、所级预先研究项目、四川省LHAASO地方配套项目等
  4. 2014年至今,任国际纯粹及应用物理联合会(IUPAP)的“天体粒子物理国际委员会(WG-10)”委员、“天体粒子物理委员会(C4)”委员。2007年至今,任中国高能物理学会常务理事、副秘书长(2019年任期满)
  5. 2012年至今,Chinese Physics C 期刊编委