kajita discovered neutrinoes switch between two identities. he observed them in a facility in japan deep underground. kajita is the 24th nobel prize winner born in japan and the 11th to win the physics award. mcdonald led a group of researchers in canada. they showed neutrinoes from the sun were changing identities on their way to earth. kajita says he is glad that his work has been honored though it might not be useful for man kind anytime soon. >> translator: i am very honored. my mind has gone blank. i'm speechless, indeed. >> translator: this research is not something that will benefit people immediately. instead, to put it nicely, it expands the horizon of knowledge for all man kind. researchers in this field are working according to our own curiosity. i am thankful that such pure scientific research has been recognized. >> translator: the neutrino research that we have been putting forward is not something that one scientist can pursue alone. in the case more than 100 researchers are engaged in a joint study towards one goal, to obtain t

. >> the 2015 nobel prize in physics to kajita and arthur b. mcdonald. >> reporter: he says the study is pure science. >> translator: it is a study, expanding the horizon of knowledge for all man kind. scientists are prompted by our own curiosity. >> reporter: he's devoted himself to solving the mysteries of the universe since his early days. he started to look into the nutrinos in the atmosphere. they are subatomic particles, but not much had been discovered about what they are. about 66illion are released from the sun and shower the earth every second. scientists around the world built this, and kajita and the team worked inside the earth in a huge facility that was 1,000 meters underground. they detected the faint light that particles generate when they interaction with water. the results showed the number of nutrinos from the sun to the detector was just half of what was predicted raisingle possibility that they transform into another type on its way. this changed caused additional observations and studies by the canadian team that drew con

working separately, arthur mcdonald and takaaki kajita proved the subatomic particles have mass. in tokyo today, kajita said the research is just one small step toward understanding the complexities of the cosmos. >> ( translated ): the universe we live in is filled with things that have yet to be discovered. such enormous questions are not resolved in research that is done in a matter of one day, or two days, but it takes many people getting involved over the course of many years to unravel the mystery. so i really hope young people will participate in solving these mysteries. >> woodruff: most neutrinos that reach earth were created by nuclear reactions inside the sun, and trillions of them pass through the human body every second. there's word the obama administration deported fewer immigrants over the past year than at any time since 2006. the associated press reports 231,000 people were sent home in the 12 months that ended in september. that does not include mexicans who were caught at the border and quickly returned. this was a lackluster day on wall street. the dow jones

it was kajita's first appearance in the lab since receiving the news he won the nobel. a researcher presented him with flowers hoping his mentor continues to break new ground in physics. >> translator: it was just six months after i'd finish by doctoral thesis when a found a hint that eventually led to the nobel prize, so i want to emphasize that young researchers always have a chance for success. >> reporter: the director of the university of tokyo's institute for cosmic ray research won the prize along with canadian researcher arthur b. mcdonald proving that elementary parti e particles have mass. >>> a proposal to add pipes for the 2020 summer olympics in tokyo got a promising response. a senior member of the international olympic committee welcomed the organizers' suggestions. the members suggested adding 18 events in five sports for the games in the japanese capital. they are baseball and softball, karati, skate boarding, sport climbing, and surfing. the ioc coordination commission chair welcomed the choices when he met with the organizers. >> we are very cloudy sk