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

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

3. My publication with Prof. Song

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

5. 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

6. 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 !!!

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

8. 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 ( )

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

10. [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), (web of science)]

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

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

13. 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

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