text: This measuring station, installed at the end of one of the ISOLDE beamlines, consists of a TAS, and a tape station.
  In this station, a beam pipe is used to hold the tape. The beam is implanted in the tape outside of the TAS, which is then transported to the center of the detector for the measurement. In this station it is also possible to implant the beam directly in the center of the TAS, by changing the position of the rollers. The latter procedure allows the measurement of more exotic nuclei with very short half-lives.
  Lucrecia is the TAS at this station. It is made of one piece of NaI(Tl) material cylindrically shaped with φ = h = 38 cm (the largest ever built to our knowledge). It has a cylindrical cavity of 7.5 cm diameter that goes through perpendicularly to its symmetry axis. The purpose of this hole is to allow the beam pipe to reach the measurement position so that the tape can be positioned in the center of the detector. It also allows the placement of ancillary detectors in the opposite side to measure other types of radiation emitted by the activity implanted in the tape (x rays, e−/e+, etc.). However, the presence of this hole makes this detector less efficient as compared to the GSI TAS (Lucrecia’s total efficiency is around 90% from 300 to 3000 keV). Lucrecia’s light is collected by 8 photomultipliers. During the measurements Lucrecia is kept measuring at a total counting rate not larger than 10 kHz to avoid second and higher order pileup contributions.
  Surrounding the TAS there is a shielding box 19.2 cm thick made of four layers: polyethylene, lead, copper and aluminium. The purpose of it is to absorb most of the external radiation (neutrons, cosmic rays, and the room background).