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An electron transparent proton detector for neutron decay studies

J. Appl. Phys. 99, 084904 (2006); doi:10.1063/1.2186970

Published 19 April 2006

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S. A. Hoedl and A. R. Young
Triangle University Nuclear Laboratory, Duke University, Durham, North Carolina 27708

H. Ade
Department of Physics, North Carolina State University, Raleigh, North Carolina 27695

A. Lozano
Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695
We have developed an ultrathin (<100  nm), very strong polyimide foil which can span more than 6×6  cm2 and is ideal for the fabrication of low energy proton detectors. We have produced a proton detector geometry in which protons incident on the foil with kinetic energies greater than about 25  keV produce, on average, more than ten secondary electrons in a conversion crystal evaporated on the back face of the foil. These secondary electrons can be "postaccelerated" and counted in a variety of detectors. The polyimide foils are much more durable than carbon foils previously used in similar detection geometries. LiF was chosen as the conversion crystal, which is relatively insensitive to exposure to air, improving their secondary electron yield under typical operating conditions. In addition, we describe the operation of a very simple, small scale proton accelerator and detector testing chamber capable of providing up to 10  kHz of beam with energies between 10 and 50  keV onto a biased target with a maximum ion contamination of 0.5%. ©2006 American Institute of Physics
History: Received 21 October 2005; accepted 22 February 2006; published 19 April 2006
Permalink: http://link.aip.org/link/?JAPIAU/99/084904/1
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KEYWORDS and PACS

Keywords
PACS
  • 29.40.-n
    Radiation detectors
  • YEAR: 2006

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ISSN:
0021-8979 (print)   1089-7550 (online)
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