Tuesday, October 6, 2015

Nobel Prize in physics for the discovery of neutrino oscillations – Gazeta Wyborcza

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              The winners of the Nobel Prize for Physics
                  
 
                  
                 
                    

Winners of the Nobel Prize for Physics

                  
                  
                  

                  
             


             
         
     
   
   
   
 
 
 
 

This year's Nobel Prize for outstanding achievements in the field of physics will go to the Japanese Takaaki Kajita and Canadian Arthur B. McDonald. The Nobel Committee recognized the discovery of neutrino oscillations, which testify to the fact that neutrinos have mass.

 
 
 
 
 
 
 
 
 
 
 
 
 
                          
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
         

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On Monday morning, the Swedish Academy has presented this year's winners of the Nobel Prize in physics. This award has been awarded since 1901. Alfred Nobel physics just mentioned first in his will establishing the award. At the end of the nineteenth century it was thought to be the driving force of all science. By 2014 Nobel Prize in physics was awarded 108 times, highlighting 198 scientists. Last year, a glowing blue semiconductor diodes.

The winners of this year's Nobel Prize was announced at the Royal Swedish Academy of Sciences in Stockholm, which selects distinguished in this field. He presented the Secretary of the Academy Goran K. Hansson.

- This year's Nobel Prize for outstanding achievements in physics goes to Takaaki Kajita and Arthur B. McDonald, for the discovery of neutrino oscillations, which testify to the fact that neutrinos have mass - said .

The winners - in addition to the awards, dreams about the world of science - will receive medals, diplomas and share amounted to SEK 8 million, ie approx. 850 thousand. the euro.

Neutrinos, which we constantly intermingle

Nautrina this mysterious elementary particles whose existence is confirmed experimentally in 1956. On Earth, formed through the interaction of cosmic rays in the upper atmosphere. There are also emitted by the sun and produced in nuclear reactors.

Nautrina move almost at the speed of light. Through every square centimeter of our bodies each second passes tens of billions of such particles. Without injury and without a trace, because they have no electric charge and the matter is for them almost transparent. If you do not collide directly with the nucleus of one of the atoms in our body, then fly through.

Neutrinos belong to three families (electron, muon and tau). And they have the property that the fly can change into one another. It was a phenomenon is called neutrino oscillation and - as demonstrated Nobliści- depends on the particle masses.

underground neutrino observatories

Mystery particles, scientists are looking at underground observatories. Arthur B. McDonald is the head of one of them -Sudbury Neutrino Observatory (SNO) in Canada. It is located in a nickel mine at a depth of 2073 meters. This location reduces the "noise" created by cosmic rays.

neutrino detector is a heavy water tank with a diameter of 12 m and a capacity of 1000 tons, containing about 1 ton of crystalline indium. When a neutrino hits the nucleus of indium the emission of an electron and gamma radiation (photon) that can be registered. Same neutrinos are "invisible" - pass through matter does not interact with it.



Arthur B. McDonald was born Sydney (Nova Scotia, Canada) and graduated in physics Dalhousie University in 1965. He is currently the head of the local cathedral of research and director of the Sudbury Neutrino Observatory Institute. It was there in August 2001, the detector has provided data that neutrinos oscillate.

Takaaki Kajita is a Japanese physicist who became famous study of neutrinos in the Super-Kamiokande detector in Japan. This is where it was found the dependence of the number of muon from a distance, they have gone, which is proof of the phenomenon of oscillation.

Statistics Nobel Prizes in physics

- since 1901 awarded 108 Nobel Prizes in physics (no prizes awarded only in the years 1916, 1931, 1934, 1940, 1941 and 1942). In total awarded 198 physicists .

- 47 prizes were awarded to a single winner, 31 awards were distributed among two winners and 30 awards divided three winners.

- The average age of winners in physics is 55.

- The youngest was Lawrence Bragg , who was 23 years old when his father receive the Nobel Prize in 1915, year for "a new method for studying the structure of crystals using X-ray."

- The oldest is the American physicist Raymond Davis Jr , which in 2002 was awarded for "pioneering contributions to astrophysics, in especially for the detection of cosmic neutrinos ". He was 88.

- Only two women were given the Nobel Prize for physics. Maria Sklodowska-Curie in 1903. and Maria Goeppert-Mayer in 1963 for "discoveries concerning the coating structure of the atomic nucleus."

- The only scientist who received the prize in physics was twice John Bardeen . In 1956,. It awarded him "the study of semiconductors and the invention of the transistor," and in 1972. For "the formulation of the theory of superconductivity."

- As many as four prize in physics fell into the hands of both the father and son William Bragg and Lawrence Bragg were awarded in 1915. Niels Bohr received the Nobel Prize in 1922., and his son Aage Bohr - in 1975. Manne Siegbahn was awarded in 1924., and his son Kai Siegbahn - in 1981. JJ Thomson was awarded in 1906., And his son, George Paget Thomson - in 1937.

         

         

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