72564S03-I The nuclear physics research supported by DOE has a fundamental need for instruments that detect photons (x- and gamma rays). Segmented germanium detectors can provide better position and energy resolution than any other practical detector system. Although no fundamental technical… More

72564-The nuclear physics research supported by DOE has a fundamental need for instruments that detect photons (x- and gamma rays). Segmented germanium detectors can provide better position and energy resolution than any other practical detector system. Although no fundamental technical roadblocks… More

Gamma ray and neutron emitting isotopes can be located and identified with the use of a directional gamma ray and neutron detection system having excellent spectroscopic energy resolution. Segmented germanium gamma-ray detectors are the best detectors for such a system. Recent evolutions in… More

78248S Segmented germanium detector arrays are needed by the DOE for the characterization of low-level radioactive samples. In addition, the same detector arrays could perform important fundamental physics measurements, including the search for rare-events like neutrinoless double-beta decay. … More

Segmented germanium detector arrays are needed by the DOE for the characterization of low-level radioactive samples. In addition, the same detector arrays could perform important fundamental physics measurements, including the search for rare-events like neutrinoless double-beta decay. However,… More

Arrays of germanium gamma-ray detectors are used for nuclear physics experiments at DOE particle accelerator facilities. Energetic massive particles from the accelerator degrade the performance of the detectors and ultimately limit their use. This problem pertains to the currently-existing… More

The DOE operates several synchrotron x-ray-absorbtion-spectroscopy facilities for the study of dilute samples of chemical, biological, condensed matter, and environmental interest. These facilites require advanced semiconductor detectors. This project will develop detector arrays for x-ray… More

We propose a method of detecting high explosives from large distances using neutron induced gamma-ray detection and imaging. The gamma rays will be detected and imaged using an advanced position-sensitive germanium detector system. The superb position and energy resolution of the detector system… More

The DOE Medical Sciences program supports advanced instrumentation for radionuclide imaging, which can serve as the basis for improved SPECT imaging systems. Therefore, this project will develop and evaluate improved detectors for planar radionuclide imaging. Phase I will demonstrate enhanced,… More

Ever larger gamma ray detector arrays made from germanium crystals are being used, and will continue to be used, in nuclear physics research. However, radiation damage limits the time that a germanium detector can be used; for example, an average Gammasphere detector may function in an array for… More

This effort will develop technology to improve the detection and location high explosives at large distances. The system will involve the use of an advanced gamma-ray detector and a neutron source. The detector concept will be developed into two prototype systems that will serve to demonstrate the… More

Large diameter germanium crystals are needed to provide larger, more sensitive, gamma-ray detectors for nuclear physics measurements at DOE user facilities. In this project, germanium crystal growth techniques will be experimentally developed for the growth of large diameter crystals. Phase I will… More

Efficiently grown germanium crystals and detectors are needed for DOE¿s low-background user facilities. These detectors are at the forefront of physics in the search for rare processes, such as neutrinoless double-beta decay, and also are used for low level counting facilities to characterize… More

The semiconductor electrodes on segmented germanium planar detectors used in nuclear physics research require improvement, so that significantly more of the available high-purity germanium can be utilized for the detection function. This project will develop new semiconductor electrode technology… More

The next generation of DOE low-background user facilities will require suitable germanium crystal production capabilities. These crystal-growth techniques must accommodate the handling of highly enriched germanium in a manner consistent with low background counting. In this project, germanium… More

The semiconductor contacts on segmented germanium planar detectors require improvement to commercially supply better detectors at lower cost with faster delivery. In addition, this improvement will result in the utilization of significantly more high-purity germanium crystals for detector… More

The existence of larger diameter germanium crystals will provide larger, more sensitive, gamma-ray detectors for Nuclear Physics measurements at DOE user facilities. Large Diameter germanium crystal growth techniques will be experimentally developed during the Phase I and Phase II. Large diameter… More

Difficulties associated with thick lithium-diffused entrance windows on the outside of p-type coaxial and point-contact germanium gamma-ray detectors have always been a technical hindrance. The lithium dead layer limits the low-energy detection range and adds background in the energy spectrum,… More

DOE Nuclear Physics user facilities require larger high-resolution gamma-ray detector systems to provide higher sensitivity measurements. Large diameter germanium crystals are being grown, evaluated, and iteratively improved in the laboratory. Large-diameter crystals will be made into large… More

DOE Nuclear Physics low-background rare-particle detection arrays require germanium detectors having the minimum possible background and maximum sensitivity. Larger p-type point-contact germanium detectors having better performance are being experimentally developed through collaboration with DOE… More