Levels ofAl25from theMg24(d, n)Al25Reaction

Abstract

A 67-kev target of ${\mathrm{Mg}}^{24}$ was bombarded with 4.007-Mev deuterons, and the neutron groups from the ${\mathrm{Mg}}^{24}(d, n){\mathrm{Al}}^{25}$ reaction were studied at seven different angles with Ilford C2 emulsions. The observed $Q$ values are +0.07±0.06, -0.38±0.06, -0.88±0.05, -1.74±0.04, (-1.87±0.04), -2.44±0.04, -2.67±0.04, (-2.85±0.04), and -3.04±0.03 Mev. The neutron groups with the $Q$ values -2.44, -2.67, and -3.04 Mev correspond to virtual states of ${\mathrm{Al}}^{25}$ which have previously been seen as ${\mathrm{Mg}}^{24}$+$p$ resonances. From the Butler theory for the angular distribution of the stripped neutrons, the ground state of ${\mathrm{Al}}^{25}$ is described by $J=\frac{3}{2} or \frac{5}{2}$, even parity; the first excited state is $J=\frac{1}{2}$, even parity, and the second excited state is likely to be $J=\frac{3}{2} or \frac{5}{2}$, even parity. The level structure of ${\mathrm{Al}}^{25}$ is compared to that of ${\mathrm{Mg}}^{25}$.