One-neutron stripping fromBe9toTm169,Ta181, andRe187at near-barrier energies

Abstract

We report the measurement of one-neutron stripping of $^{9}\text{Be}$ to the $^{169}\text{Tm},\phantom{\rule{0.16em}{0ex}}^{181}\text{Ta}$, and $^{187}\text{Re}$ nuclei, in the range from subbarrier to above-barrier energies. The activation technique was used, with the detection of off-line $\ensuremath{\gamma}$ rays. The results show that the transfer cross sections for the three systems investigated are very similar and are much larger than the corresponding fusion cross sections at subbarrier energies, whereas fusion predominates at energies above the barrier. Data are in good agreement with our coupled reaction channel calculations. We also investigate the ratio, as a function of energy, between experimental transfer and fusion cross sections. The role of transfer couplings on the fusion excitation functions is also discussed.