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The calcium isotopes have emerged as an important testing ground for newmicroscopically derived shell-model interactions, and a great deal of focus hasbeen directed toward this region. We investigate the relative spectroscopicstrengths associated with $1f_{7/2}$ neutron hole states in $^{47, 49}$Cafollowing one-neutron knockout reactions from $^{48,50}$Ca. The observedreduction of strength populating the lowest 7/2$^{-}_{1}$ state in $^{49}$Ca,as compared to $^{47}$Ca, is consistent with the description given byshell-model calculations based on two- and three-nucleon forces in the neutron$pf$ model space, implying a fragmentation of the $l$=3 strength tohigher-lying states. The experimental result is inconsistent with both theGXPF1 interaction routinely used in this region of the nuclear chart and withmicroscopic calculations in an extended model space including the $\nu1g_{9/2}$orbital.

Unexpected distribution of $\nu1f_{7/2}$ strength in the calcium isotopes at $N$=30