Quarks and neutron halo nuclei, nuclear clusters and nuclear molecules

It is shown that the hole in the centre of H-3, He-3 and He-4(1) the neutro n halos in nuclei, the alpha- and other clustering effects in nuclei and th e nuclear molecules all basically arise due to the same underlying effect. We shall show that all these ground state properties of nuclei are manifest ations of quark effects. The role of triton clustering in very neutron rich nuclei is emphasized. All these require the concept of hidden colour state s which arise from confinement ideas of QCD for the multi-quark systems. Th is provides a comprehensive understanding of diverse nuclear effects and ma kes unique predictions.