Heavy-Ion-Induced Single-Nucleon Transfer Reactions in the Zr-Mo Region

Abstract

The ($^{16}\mathrm{O}$, $^{15}\mathrm{N}$) and ($^{16}\mathrm{O}$, $^{15}\mathrm{O}$) reactions on targets of $^{90,\phantom{\rule{0ex}{0ex}}91,\phantom{\rule{0ex}{0ex}}94}\mathrm{Zr}$, $^{92}\mathrm{Mo}$, and $^{93}\mathrm{Nb}$ have been investigated with a 104-MeV $^{16}\mathrm{O}$ beam from the Berkeley 88-in. cyclotron. Spectra for the ($^{16}\mathrm{O}$, $^{17}\mathrm{O}$) reaction (leading to the ground states of $^{90,\phantom{\rule{0ex}{0ex}}93}\mathrm{Zr}$) and for the ($^{12}\mathrm{C}$, $^{11}\mathrm{B}$) reaction on $^{90}\mathrm{Zr}$ and $^{92}\mathrm{Mo}$ at 78 MeV were also obtained. Outgoing heavy ions were detected in the focal plane of a magnetic spectrometer with a Borkowski-Kopp type position-sensitive proportional counter backed by a plastic scintillator. The ($^{16}\mathrm{O}$, $^{15}\mathrm{N}$) and ($^{16}\mathrm{O}$, $^{15}\mathrm{O}$) data indicate a preference for high-angular-momentum transfer similar to (but less pronounced than) that shown by the ($\ensuremath{\alpha},t$) and ($\ensuremath{\alpha}$, $^{3}\mathrm{He}$) reactions on the same targets. No evidence for a multistep excitation of core-excited states is apparent from the present data.