ABSTRACT
One popular feeling is that the phenomenon illustrates that the quarks in individual nucleons are not mere passive spectators bound inside individual nucleons, but partake in a highly active role in the nucleus. Thus, the European Muon Collaboration effect is clear empirical evidence in support of specific quark effects in nuclei. Several models postulate that the size of bound nucleons is larger than the free ones. This chapter shows that the quarks in a single nucleon are affected by the fact that there are other nucleons present in a nuclear medium. It explores specific situations where quarks provide their unique signatures in a nucleus. The colour confinement hypothesis of quantum chromodynamics states that what we observe as a baryon and a meson in the laboratory is the particle that corresponds to the colour singlet part. Now clearly the system, i.e., the deuteron, predominantly exists in individual colour singlet states of a proton and a neutron.
