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

Abstract 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 - μ m thick fast-plastic scintillation detectors. Its phoswich structure allows individual Z resolution for 1 H, 4 He, 7 Li, 4 He+ 4 He, 9 Be, 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 4 π 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 ° .