'Phoswich Wall': A charged-particle detector array for inverse-kinematic reactions with the Gretina/GRETA γ-ray arrays

摘要

A high-efficiency, forward-hemisphere detector system for light charged particles and low-Z heavy ions, as obtained in an accelerator experiment, is described. It consists of four 8×8 pixel multianode photomultiplier tubes with 2.2-mm thick CsI(Tl) and 12-μm thick fast-plastic scintillation detectors. Its phoswich structure allows individual Z resolution for ~1H, ~4He, ~7Li, ~4He+~4He, ~9Be, ~(11)B, ~(12)C and ~(14)N ions, which are target-like fragments detected in strongly inverse kinematics. The device design has been optimized for use with a 4π γ-ray array, and the main applications are transfer reactions and Coulomb excitation. A high-angular resolution for the detection of the target-like fragments is achieved which permits angular distributions to be measured in the rest frame of the projectile-like fragment with a resolution of ～ 2°.