Development of a High Solid-Angle Silicon Detector Array for Measurement of Transfer Reactions in Inverse Kinematics

Astronomy and Astrophysics – Astrophysics

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Scientific paper

The development of radioactive beams with high quality beam profiles, such as those available at the HRIBF at Oak Ridge National Laboratory, has made the perform transfer reactions in inverse kinematics on unstable nuclei possible. Such measurements on neutron-rich nuclei yield data on the development of nuclear structure away from stability, and are of specific astrophysical interest due to the proximity to the r-process path. With the relatively low intensities currently obtainable with radioactive beams (compared to stable beam intensities), high detection efficiencies are required to make such experiments statistically feasible. The Oak Ridge Rutgers University Barrel Array (ORRUBA) is a new silicon detector array designed for measurements of transfer reactions in inverse kinematics, consisting of two rings of silicon detector telescopes. These provide high solid angular coverage for angles symmetrically forward and backward of θ = 90^rc. Each telescope consists of a thin transmission detector, and a thick stopping detector, and each detector is divided into four resistive strips, providing position information. Such an arrangement enables particle identification, determination of the emission angles of the detected particles and measurement of their energies. The array is currently in its construction phase. An outline of the arrays scientific motivation and technical aspects will be presented. *This work was supported in part by the U.S. Department of Energy

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