Excitation Functions forTb149gfrom Reactions between Complex Nuclei

Abstract

Excitation functions have been measured for twelve reactions that produce 4.1-h ${\mathrm{Tb}}^{149g}$ from Tb compound nuclei. Projectiles were ${\mathrm{B}}^{10}$, ${\mathrm{B}}^{11}$, ${\mathrm{C}}^{12}$, ${\mathrm{N}}^{14}$, ${\mathrm{N}}^{15}$, ${\mathrm{O}}^{16}$, ${\mathrm{O}}^{18}$, and ${\mathrm{F}}^{19}$. Peak cross sections range from approximately 0.5% to approximately 7% of the calculated total reaction cross section. The excitation functions are well systematized by the simple assumption that only those compound nuclei of angular momentum less than $7.5\pm 1.5\hslash$ are effective in these reactions.