|On Target (November & December 1996)|
BASIC BUILDING BLOCKS
Quarks, gluons and a third group of particles, called leptons (the electron is an example of a lepton), are generally believed to be the building blocks of matter. While electrons surround nuclei in atoms, quarks are found inside protons and neutrons which are located inside the nucleus of atoms.
Scientists thus far, have detected six different quarks: up, down, strange,
charm, top and bottom. A kaon is a particle made up of an anti-strange
(antiparticle of the strange quark) and an up quark pair.
December 1996 marks a month of accomplishments for Jefferson Lab: Beam was
delivered to Hall B and 525 kilowatt beam delivered to Hall C, both on
December 5; and polarized beam was delivered to Hall C on December 15.
These were huge efforts by many people. Congratulations!