Neutrino: Completely polarized particle “Song Memorial Symposium” (고 송희성 교수 추모 심포지움) 서울대 상산수리과학관, 2017년 4월 12/13일 김수봉 (서울대 물리학부)

My master thesis advisor “Final Polarizations in quasielastic neutrino nucleon scattering” (1988)

My publication with Prof. Song

Particle Polarization & Dirac Equation Helicity (spin polarization) : - Left handed (LH) & right handed (RH) helicities Dirac equation : - A relativistically moving point-like fermion

Completely Polarized Neutrino LH neutrino & RH antineutrino : - Left handed Standard Model (SM) - Massless neutrino in SM (no interaction between LH and RH neutrinos) Discovery of neutrino oscillation and mass : - Nobel prize in physics (2015) : Kajita and McDonald - Requires modification of SM to include the neutrino mass and the right handed neutrino

Calculation with QED Calculation of transition amplitude : - Doing “trace” of g -matrices - Cross section : usually “trace” of 4 or 6 g –matrix products Calculation of polarized transition amplitude : - Even “trace” of 8 g –matrix products !!!

Prof. Song’s work on neutrinos Who is he?

My research work on neutrinos Ph.D. thesis on solar neutrino detection (1989) : - Real time, directional measurement of 8B solar neutrinos in the Kamiokande-II detector and search for short-time variation Detection of a neutrino burst from the Supernova SN1987A (1987) Observation of atmospheric and solar neutrino oscillations (1998) at Super-Kamiokande Measurement of neutrino oscillation parameters using an accelerator beam with K2K and T2K (1998-2011)

Construction of RENO neutrino detector (2011) 450 m.w.e. Far Detector Near Detector 1380m 290m 120 m.w.e.

[citation : 1509 (Inspires), 928 (web of science)] Observation of the smallest neutrino mixing angle q13 (2012) Definitive measurement of the last, smallest neutrino mixing angle q13 based on the disappearance of reactor electron antineutrinos → Open a bright window for (1) CP violating phase, and (2) neutrino mass hierarchy [citation : 1509 (Inspires), 928 (web of science)]

Observation of energy and baseline dependent reactor antineutrino disappearance (2016) ~2.5% (± 12 %) (± 10 %)

Efforts on Korea Neutrino Observatory (KNO) 대구시 달성군 비슬산 경북 영천시 보현산

Physics Potentials of KNO Neutrino oscillation Neutrino telescope New step to geo-science CP phase & neutrino mass ordering at 2nd oscillation maximum Lifetime : 1035 yr

송희성 교수님, Polarization, ... 잊지 않고 길이 기억할 것입니다. 그리고 감사합니다...