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Preparation of air-settled, roll-thinned phosphorus targets

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
0168-9002
Publisher
Elsevier
Publication Date
Volume
438
Issue
1
Identifiers
DOI: 10.1016/s0168-9002(99)00646-4
Keywords
  • Phosphorus
  • Powder Target
  • Pressing
  • Protective Layer
  • Self-Supporting Target

Abstract

Abstract Red 31 P targets of 2.6 and 2.9 mg/cm 2±0.1 mg/cm 2 with 1-cm×2-cm side dimensions were prepared for a nuclear mass measurement which required good thickness uniformity. The thinner target, with 50 μg/cm 2 of gold flashed on both surfaces, withstood a 173-MeV α beam of 175 nA for 18 h. Adaptations will be described for an Indiana University Cyclotron Facility air-settling method used to distribute phosphorus powder, as well as the methods developed for subsequent pressing, roll thinning, and dry release to obtain self-supporting targets. An envelope of gold foil, in contact with the phosphorus during each step, was instrumental in the process.

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