Abstract
The ${\mathrm{Al}}^{27}(\ensuremath{\alpha}, {\ensuremath{\alpha}}^{\ensuremath{'}}\ensuremath{\gamma})$ reaction was investigated by using particle-gamma coincidence techniques and the 22-Mev alpha-particle beam from the Indiana University cyclotron. A 0.79\ifmmode\pm\else\textpm\fi{}0.03 Mev gamma-ray transition between the 3.0- and 2.21-Mev states of ${\mathrm{Al}}^{27}$ was observed. This result, together with other data, suggests that the 3.0- and 2.21-Mev states are the $\frac{9}{{2}^{+}}$ and ${\frac{7}{2}}^{+}$ members of a $K=\frac{5}{2}$ rotational band.
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