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The AGATA detectors are based on encapsulated and electrically segmented n-type high-purity Ge crystals. They are 36-fold segmented with six-fold azimuthal and six-fold longitudinal segmentation. Each detector is 9 cm long and is circular at the rear side with a diameter of 8 cm, and hexagonal at the front face.
While silicon detectors cannot be thicker than a few millimeters, germanium can have a sensitive layer (depletion region) thickness of centimeters, and therefore can be used as a total absorption detector for gamma rays up to a few MeV. These detectors are also called high-purity germanium detectors (HPGe) or hyperpure germanium detectors.
Common detector materials include sodium iodide (NaI) scintillation counters, high-purity germanium detectors such as Bismuth germanate, and more recently, GAGG:Ce. To accurately determine the energy of the gamma ray, it is advantageous if the photoelectric effect occurs, as it absorbs all of the energy of the incident ray.
A clover detector is a gamma-ray detector that consists of 4 coaxial N-type high purity germanium (Ge) crystals each machined to shape and mounted in a common cryostat to form a structure resembling a four-leaf clover. [1] The clover is the first composite Ge detector.
Crystals of high purity germanium are used in detectors for gamma spectroscopy and the search for dark matter. [91] Germanium crystals are also used in X-ray spectrometers for the determination of phosphorus, chlorine and sulfur. [92] Germanium is emerging as an important material for spintronics and spin-based quantum computing applications.
There are two types of germanium detector, the lithium-drifted germanium or Ge(Li) (pronounced ‘jelly’), and the high-purity germanium or HPGe. The semiconducting element silicon may also be used but germanium is preferred, as its higher atomic number makes it more efficient at stopping and detecting high energy gamma rays.