Abstract
Using the $^{40}\mathrm{Ca}$($^{3}\mathrm{He}$,$p$) reaction at ${\text{E}}_{{}^{3}\mathrm{He}}=9$ MeV and the multidetector array HORUS, angular correlations of coincident pairs of \ensuremath{\gamma} transitions in the odd-odd $N=Z$ nucleus $^{42}\mathrm{Sc}$ have been measured at the FN tandem Van de Graaff accelerator of the University of Cologne. The analysis of the data allowed nine new spin assignments and the determination of a series of new multipole mixing ratios. In particular, the spin and parity of the ${5}^{+}$ and ${7}^{+}$ levels belonging to the lowest $T=0\ensuremath{\pi}{f}_{7/2}\ensuremath{\nu}{f}_{7/2}$ multiplet have been determined and the (${6}^{+}$) level from the $T=1$ multiplet has been tentatively assigned. In this way, all $T=1$ states up to an excitation energy of 3.2 MeV now have known spins as well as the lowest $T=0$ quadruplet (${J}^{\ensuremath{\pi}}={1}^{+},{3}^{+},{5}^{+},{7}^{+}$) and many other $T=0$ states of unknown structure. The comparison with shell-model calculations reveals that a breaking of the $^{40}\mathrm{Ca}$ core has to be invoked to describe the level structure of $^{42}\mathrm{Sc}$.
Published Version
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