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Title: Fabrication of low-cost, large-area prototype Si(Li) detectors for the GAPS experiment

Journal Article · · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
 [1];  [2];  [3];  [3];  [1];  [4];  [3];  [3];  [3];  [3];  [3];  [1];  [3];  [3];  [5];  [3];  [5]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Columbia Univ., New York, NY (United States)
  4. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara (Japan). Inst. of Space and Astronautical Science
  5. Shimadzu Corporation, Kyoto (Japan)

A Si(Li) detector fabrication procedure has been developed with the aim of satisfying the unique requirements of the GAPS (General Antiparticle Spectrometer) experiment. Si(Li) detectors are particularly well-suited to the GAPS detection scheme, in which several planes of detectors act as the target to slow and capture an incoming antiparticle into an exotic atom, as well as the spectrometer and tracker to measure the resulting decay X-rays and annihilation products. These detectors must provide the absorption depth, energy resolution, tracking efficiency, and active area necessary for this technique, all within the significant temperature, power, and cost constraints of an Antarctic long-duration balloon flight. We report here on the fabrication and performance of prototype 2"-diameter, 1–1.25 mm-thick, single-strip Si(Li) detectors that provide the necessary X-ray energy resolution of ~4 keV for a cost per unit area that is far below that of previously-acquired commercial detectors. Lastly, this fabrication procedure is currently being optimized for the 4"-diameter, 2.5 mm-thick, multi-strip geometry that will be used for the GAPS flight detectors.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1490683
Journal Information:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Issue: C Vol. 905; ISSN 0168-9002
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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