講演者：柴田　徹 氏（青山学院大学理工学部）
日時：１０月　１５日（金）　午後４時３０分から
場所： 青山学院大学　理工学部（相模原キャンパス）Ｌ棟６階　Ｌ６０３室

題目： 「Cosmic-rays as Particle Physics and Astrophysics」


要旨：
  It has been about a century since V. Hess discovered
the cosmic-ray (CR) in 1912. First I overview the history 
of CRs from the view point of particle physics, focusing 
upon the Brazil-Japan (B-J) Emulsion Chamber Collaboration 
in connection with the accelerator physics. The B-J 
collaboration started from a letter of Prof. Yukawa to 
Prof. Lattes in 1959, proposing a joint experiment of CRs 
at Mt. Chacaltaya, who, needless to say, predicted a new 
particle, “meson”, in 1935, and discovered it in 1947 
respectively. In my talk, I survey the contributions of 
the B-J emulsion chamber experiments to the particle 
physics, what are successful and/or unsuccessful, while 
of rather my personal summary with a biased view.  Second I present the CR physics from the view point 
of astrophysics, focusing my interest on the CR 
acceleration and the propagation in the Galaxy, in 
connection with several anomalies recently observed 
in CRs such as the excess of electron-positron. After 
viewing briefly the energy budget of CRs in the Galaxy, 
I present the development of the CR acceleration and 
the propagation, based on RUNJOB data (RUssia-Nippon 
JOint Balloon program) together with those obtained 
most recently by satellite (FERMI) as well as balloons 
(ATIC, CREAM, TRACER), and finally summarize what are 
open questions in CR physics reserved for future studies 
in both theory and experiment.

---------------------------------