NUCLEON MOMENTUM AND DENSITY DISTRIBUTIONS IN HE-4 CONSIDERING INTERNAL-ROTATION

A successful, simultaneous reproduction of density and momentum distri butions in He-4 is presented in a method accounting for nucleon correl ations using only two functions (1s and 1d) and totally three paramete rs, while in the best fit of equal quality known to us there are 12 pa rameters. Further, a physical interpretation of the 1d state involved is given as coming from an internal rotation of nucleons. Such an inte rpretation provides a hint that the neutron skin and neutron halo in e xotic nuclei could have a rotational origin. [S0556-2813(98)05010-9].