First (d,p) experiment using active target detector ANASEN

The energetic location of the d$_{3/2}$--orbital in neutron-rich nuclei is of particular interest as it determines the location of the drip-line in the oxygen isotopes. Its behavior has recently been discussed as a consequence of three-body forces [1]. Manifestations of such forces are traced through the location of the d$_{3/2}$ orbital, which closer to stability leads to highly excited states. In order to study the location and fragmentation of this orbital in $^{20}$O, we performed an experiment at the {\sc resolut} radioactive beam facility of the Florida State University accelerator laboratory. We produced a beam of the short-lived $^{19}$O isotope with an intensity of $1 \times 10^5$ pps, 65$\%$ purity and 4.4 MeV/u. This beam was used to study the spectroscopic factors of bound and unbound states of $^{20}$O using the $(d,p)$ reaction in inverse kinematics and the new {\sc anasen} active-target detector. We will present the methods used and compare our results with the ones recently published in [2].\\[4pt] [1] T. Otsuka et al., Phys. Rev. Lett 105, 032501 (2010)\\[0pt] [2] C. R. Hoffman et al., Phys. Rev. C 85, 054318 (2012)