Measuring ⁸⁴Se(d,p) at 45 MeV/A to reduce uncertainties in spectroscopic factors of states in ⁸⁵Se

Neutron-transfer reactions with radioactive ion beams (RIBs) enable the structure of neutron-rich nuclei to be studied. With (d,p) reactions, spectroscopic factors can be extracted through a normalization of the observed angular distribution of reaction protons to that modelled using theory. They are, therefore, heavily dependent on the optical-model parameters chosen to model the bound state. A combined method using high and low energy RIBs allows for both a peripheral and more central probe of the nucleus, thereby constraining the appropriate bound state parameters and reducing uncertainties in the extracted spectroscopic factors. Having previously been demonstrated with the ⁸⁶Kr(d,p) reaction, this method is now being used to determine spectroscopic factors of states in ⁸⁵Se through ⁸⁴Se(d,p). A measurement at 4.5 MeV/A has already been performed [1], providing the low-energy analysis. The high-energy measurement at 45 MeV/A was performed at the NSCL using ORRUBA and SIDAR to measure reaction protons in coincidence with the heavy ion recoil using the S800 spectrograph. Preliminary results will be presented.

[1] J.S. Thomas et al., Phys. Rev. C 76, 044302 (2007)