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A new generation of gamma-ray detectors has been developed, primarily to study the structure of atomic nuclei. Much of the knowledge about the...

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Figure 1.Gammasphere detector element. The germanium crystal detector is encased in an aluminum can, and slides in to about 3 cm (1 in.) from the front face of the bismuth germanate (BGO) Compton suppressor element. Thus, the germanium is completely surrounded by BGO except at the front, toward the gamma-ray source. A liquid-nitrogen Dewar is required to keep the germanium detector cold. (Ernest O. Lawrence Berkeley National Laboratory)

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Figure 2.Gammasphere with the Microball. One-half of the Gammasphere is shown surrounding the target chamber with the Microball inside. The beam line runs from left to right, and the target is at the center of the Microball. (Ernest O. Lawrence Berkeley National Laboratory)

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