Particle Physics Timeline 1895 Xrays discovered by W

Particle Physics Timeline 1895 X-rays discovered by W. Roentgen 1897 Electron discovered by J. J. Thompson 1900 1905 1910 1915 1905 Photons proposed by A. Einstein 1911 Nucleus discovered by E. Rutherford 1916 Photons generally accepted and tested

1920 1925 1930 Neutrinos proposed by W. Pauli 1932 Positron discovered by C. D. Anderson 1932 Neutrons discovered by J. Chadwick 1935 1933 Enrico Fermi gives the Neutrino its name, (little neutral one) 1935 Meson predicted by Yukawa 1938 Muon detected in cosmic radiation by C. Anderson 1940

1945 1947 Pi-meson (pion) discovered by Powell and Occiallini 1950 1951 First (anti)neutrino detector built near a nuclear reactor by Reines and Cowen 1955 Antiproton discovered 1960 1956 (anti)neutrinos detected by Reines and Cowen at larger underground detector near Savannah River nuclear reactor 1957 Neutrino detector built by R. Davis of Brookhaven Nat’l Labs found no neutrinos. (only antineutrinos emitted by reactor) 1962 The discovery of the muon-neutrino at Brookhaven 1963 Quarks proposed by Gell-Mann and Zweig 1965 First Solar neutrinos detected at Homestake Gold Mine by Davis

1970 Charm quark proposed 1975 1977 Bottom quark discovered by Lederman at Fermilab 1974 Charm quark discovered by Richter and Ting 1980 1983 W, Z Bosons discovered at CERN by C. Rubbia 1985 1990 1985 WIMPS proposed in Supersymmetric Theory by Goodman and Witten

1995 Top quark discovered at Fermilab 1996 DAMA collaboration builds WIMP detector in Italy, sees disputed WIMP signal in 1998 2000 1998 Super Kamiokande in Japan shows neutrinos have mass using cosmic ray neutrinos 1998 Sudbury Neutrino Observatory in Ontario built 1999 Berkley and Stanford CDMS I WIMP search begun 2000 DONUT experiment at Fermilab first observes the Tau Neutrino 2005 2002 Edelweiss (France) WIMP search publishes first results, no WIMPS detected 2003 MINOS Far Detector fully operational, observing cosmic rays 2003 SNO provides last piece of Solar Neutrino puzzle, showing that solar neutrinos show signs of mass too 2005 Nu. MI beam at Fermilab switched on, first beam neutrino detected by the Far Detector in November

2006 2007 2008