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Title: Physics/Particle/Neutrino - The First Detection of The Neutrino A short article describing the discovery.
Frederick_Reines Discoverer of the neutrino.

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The First Detection of The Neutrino by Frederick Reines and Clyde Cowan

The First Detection of The Neutrino by Frederick Reines and Clyde Cowan

Dennis Silverman

Fred Reines and Clyde CowanFred Reines and Clyde Cowan at the Control Center of the HanfordExperiment (1953)In 1930 Wolfgang Pauli proposed a solution to the missing energy innuclear beta decays, namely that it was carried by a neutral particleThis was in a letter to the Tubingen congress. Enrico Fermi in 1933named the particle the "neutrino" and formulated a theory forcalculating the simultaneous emission of an electron with a neutrino.Pauli received the Nobel Prize in 1945 and Fermi in 1938. The problemin detection was that the neutrinos could penetrate several lightyears depth of ordinary matter before they would be stopped.In 1951 Fred Reines at Los Alamos thought about doing some realchallenging physics problem. In a conversation with Clyde Cowan theydecided to work on detecting the neutrino. Their first plans were todetect neutrinos emitted from a nuclear explosion. Realizing thatnuclear reactors could provide a neutrino flux of 10^13 neutrinos persquare centimeter per second, they instead mounted an experiment atthe Hanford nuclear reactor in 1953. The Hanford experiment had alarge background due to cosmic rays even when the reactor was off.The detector was then moved to the new Savannah River nuclear reactorin 1955. This had a well shielded location for the experiment, 11meters from the reactor center and 12 meters underground.The detection of the neutrino was as the initiator of theinverse-beta decay reaction of:anti-neutrino + proton -> neutron + positron.The target was water with CdCl_2 dissolved in it. The positron wasdetected by its slowing down and annihilating with an electronproducing two 0.5 MeV gamma rays in opposite directions. The pair ofgamma rays was detected in time coincidence in liquid scintillatorabove and below the water by photomultiplier tubes detecting thescintillation light. The neutron was also slowed by the water andcaptured by the cadmium microseconds after the positron capture. Inthe capture several gamma rays were emitted which were also detected inthe scintillator as a delayed coincidence after the positron'sannihilation gamma ray detection. The detector contained 200 litersof water in two tanks with up to 40 kg of dissolved CdCl_2. The watertanks were sandwiched between three scintillator layers whichcontained 110 5" photomultipliers each, and the whole experimentmeasured only about 2 meters in each direction.At Savannah River, Reines and Cowan carried out a series of measurementsto show that (see Reines' personal accounts below):(a) the reactor-associated delayed coincidence was consistent withtheoretical expectation;(b) the first pulse of the delayed coincidence signal was due topositron annihilation;(c) the second pulse was due to neutron capture;(d) the signal was a function of the number of target protons; and(e) the reactor-associated signal was not caused by gamma rays orneutrons from the reactor.The rarity of neutrino capture is shown in their signal rate, whichwas about three events per hour in the entire detector. The signal tobackground ratio was about four to one. Thus in 1956 was born the richand continually exciting field of experimental neutrino physics, asdiscussed in other articles in this newsletter. This discovery wasrecognized by honoring Frederick Reines with the Nobel Prize in 1995.Original papers are: "Detection of the Free Neutrino: A Confirmation", C.L. Cowan, Jr.,F. Reines, F.B. Harrison, H.W. Kruse and A.D. McGuire, Science 124, 103 (1956)."The Neutrino", Frederick Reines and Clyde L. Cowan, Jr., Nature 178,446 (1956)."Neutrino Physics", Frederick Reines and Clyde L. Cowan, Jr., PhysicsToday 10, no. 8, p.12 (1957).The history is detailed in the following accounts by Fred Reineswhich were the sources for this article:"The Early Days of Experimental Neutrino Physics", Frederick Reines,Science 203, 11 (1979)."40 Years of Neutrino Physics", Frederick Reines, Progress of Particleand Nuclear Physics, Vol. 32, 1 (1994)."The Detection of Pauli's Neutrino", F. Reines, NATO ASI series, ARW94/066,Eds. H.B. Newman and T. Ypsilantis.The history is also in the collected papers:"Neutrinos and Other Matters, Selected Works of Frederick Reines",Eds. W. Kropp, M. Moe, L. Price, J. Schultz, and H. Sobel, World Scientific, 1991.There is also an historical book:"Spaceship neutrino", Christine Sutton, Cambridge University Press 1992.The most easily accessible material may be that linked to by ourPhysics and Astronomy Department World-Wide-Web site.The links include the excellent writeup by the Royal Swedish Academy of Sciences, historical photos, and current research projects in neutrinophysics by the neutrino group.
 

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