The silicon ball: a 4π Si detector array for reaction channel selection

Abstract A 4π array of seventeen charged particle detectors (Si Ball) has been dessigned and constructed to provide selection of reaction channels for in-beam spectroscopy. The detector array, which consists of ΔE Si detectors of 170 μm thickness, is very compact to allow insertion into Inner Ball or Neutron Wall which may be a part of the NORDBALL γ-ray spectrometer. High spin states of neutron deficient nuclei around A = 80 have been studied using the Si Ball, and it has been proven that the Si Ball is a powerful tool in the in-beam spectroscopy of nuclei far from the β-stability line.