| Popis: |
A number of states in ${\mathrm{Si}}^{28}$, ${\mathrm{Mg}}^{26}$, and ${\mathrm{Mg}}^{24}$ have been studied using the ($\ensuremath{\alpha}, {\ensuremath{\alpha}}^{\ensuremath{'}}\ensuremath{\gamma}$) reaction and the angular correlation method-II geometry of Litherland and Ferguson. In ${\mathrm{Si}}^{28}$, spin and parity assignments of 1, (${6}^{+}$), and ${1}^{\ensuremath{-}}$ are made to the 7.38-, 8.51-, and 8.94-MeV states, respectively. The 4.90-MeV state in ${\mathrm{Mg}}^{26}$ is assigned ${J}^{\ensuremath{\pi}}={4}^{+}$. Earlier ${J}^{\ensuremath{\pi}}$ assignments to the ${3}^{\ensuremath{-}}$ 6.88-, ${2}^{+}$ 7.41-, and ${2}^{+}$ 7.93-MeV states in ${\mathrm{Si}}^{28}$, and the ${1}^{\ensuremath{-}}$ 8.44-, ${2}^{+}$ 9.00-, and ${1}^{\ensuremath{-}}$ 9.15-MeV states in ${\mathrm{Mg}}^{24}$ are confirmed, as is an earlier value of the multipolarity mixing ratio of the 2.94\ensuremath{\rightarrow}1.81 $\ensuremath{\gamma}$-ray transition in ${\mathrm{Mg}}^{26}$. |
