  To improve the effective interactions in the pf shell, it is important to
measure the single particle- and hole- states near the N=28 shell gap. In this
paper, the neutron spectroscopic factors of hole-states from the unstable
neutron-rich 45Ar (Z=18, N=27) nucleus have been studied using 1H(46Ar, 2H)45Ar
transfer reaction in inverse kinematics. Comparison of our results with the
particle-states of 45Ar produced in 2H(44Ar, H)45Ar reaction shows that the two
reactions populate states with different angular momentum. Using the angular
distributions, we are able to confirm the spin assignments of four low-lying
states of 45Ar. These are the ground state (f7/2), the first-excited (p3/2),
the s1/2 and the d3/2 states. While large basis shell model predictions
describe spectroscopic properties of the ground and p3/2 states very well, they
fail to describe the s1/2 and d3/2 hole-states.
