Figures 3 and 4
show similar results as Figs. 1 and 2, but for the
strength functions in
. As for the
case,
the IS and IV strength functions from the Arnoldi iteration agree
very well with the strength functions of Ref. [17]. The
convergence of strength functions is as fast as for
; after
iterations the smoothed strength functions change only by about
. We thus have to make only
iterations to calculate
reasonably accurate
strength functions for the RPA problem
whose dimension is
. The large double spikes observed in
Fig. 4 below 10MeV are due to the lowest RPA phonons,
which by the smoothing procedure acquire
100-keV widths and
move slightly down in excitation energy.
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