Coulomb Excitation withNe20Ions

Abstract

Neon ions with energies ranging from 8 to 15 MeV have been obtained by the acceleration of doubly and triply charged ions in a 5.5-MV Van de Graaff. These projectiles have been used to study Coulomb excitation in 18 nuclei ranging from ${\mathrm{Li}}^7$ to ${\mathrm{Th}}^{232}$. In particular, the levels of ${\mathrm{Ti}}^{47}$, ${\mathrm{V}}^{51}$, ${\mathrm{Fe}}^{57}$, ${\mathrm{Ni}}^{61}$, ${\mathrm{Zn}}^{67}$, ${\mathrm{Ge}}^{73}$, and ${\mathrm{As}}^{75}$ were investigated. The spin of the 320-keV state of ${\mathrm{V}}^{51}$ is uniquely assigned as $\frac{5}{2}$ and the mixing ratio, $\delta ={\left(\frac{E2\mathrm{}}{M1\mathrm{}}\right)}^{\frac{1}{2}}$, is 0.52±.07. Strong evidence is found against previous assignments of $\frac{5}{2}$ for the spin of the 184-keV state in ${\mathrm{Zn}}^{67}$. The yields and angular distributions of the gamma rays require spin assignments of $\frac{3}{2}$ and ½ for the 184- and 93-keV states, respectively, in ${\mathrm{Zn}}^{67}$.