Abstract
The development of high quality radioactive beams, such as those at the HRIBF at Oak Ridge National Laboratory, has made possible
the measurement of transfer reactions in inverse kinematics on unstable nuclei. Measurement of (d,p) reactions on neutron-rich
nuclei yield data on the evolution of nuclear structure away from stability, and are of astrophysical interest due to the proximity of suggested
nuclear burning paths in the astrophysical r-process in supernovae. Experimentally, (d,p) reactions on heavy (Z = 50) fission fragments
are complicated by the strongly inverse kinematics, and the relatively low beam intensities. Consequently, ejectile detection with
high resolution in position and energy, a high dynamic range and a high solid angular coverage is required. The Oak Ridge Rutgers
University Barrel Array (ORRUBA) is a new silicon detector array currently under construction, optimized for the measurement of
(d,p) reactions in inverse kinematics. It consists of two rings of silicon detectors, providing a high solid angular coverage for angles symmetrically
forward and backward of 90 degrees. Resistive strip detectors are used to obtain high precision position and energy measurement of
reaction ejectiles.
