Energy levels ofNa27and masses ofMg29,30observed inO18-induced transfer reactions onMg26

Multinucleon transfer reactions were observed in the bombardment of ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$ targets with 85 and 87 MeV ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ ion beams. Low yields of neutron deficient particles such as ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{14,15}{}_{}{}^{}\mathrm{O}$, and ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$ were distinguished from stronger reaction groups using a $\Delta E-E$ position sensitive ionization chamber in the focal plane of a quadrupole-dipole-dipole-dipole magnetic spectrograph. The investigation of the nuclear rearrangement reaction (${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$,${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$) determined a value of -5.653±0.055 MeV for the mass excess of ${}_{}{}^{27}{}_{}{}^{}\mathrm{Na}$ and indicated excited states at 0.80±0.10, 1.86±0.05,and 2.25±0.05 MeV. In the ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$(${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$) reaction the transition to ${}_{}{}^{29}{}_{}{}^{}\mathrm{Mg}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$ was observed with a cross section of 700 nb/sr. The mass excess of ${}_{}{}^{29}{}_{}{}^{}\mathrm{Mg}$ was found to be -10.650±0.055 MeV. The $4n$-stripping reaction (${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$,${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$) on ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$ was observed with a cross section of 12 nb/sr and was tentatively assigned to the transition to ${}_{}{}^{30}{}_{}{}^{}\mathrm{Mg}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$. This yields a mass excess of -8.760±0.055 MeV for this new isotope.