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Muon detection studied by pulse-height energy analysis: Novel converter arrangements

Artikel i vetenskaplig tidskrift
Författare Leif Holmlid
Sveinn Olafsson
Publicerad i Review of Scientific Instruments
Volym 86
Nummer/häfte 8
Sidor artikel nr 083306
ISSN 0034-6748
Publiceringsår 2015
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor artikel nr 083306
Språk en
Länkar dx.doi.org/10.1063/1.4928109
Ämnesord muon detection, ultra-dense hydrogen, muon, particle converter
Ämneskategorier Elementarpartikelfysik, Kärnfysik, Plasmafysik med fusion

Sammanfattning

Muons are conventionally measured by a plastic scintillator–photomultiplier detector. Muons from processes in ultra-dense hydrogen H(0) are detected here by a novel type of converter in front of a photomultiplier. The muon detection yield can be increased relative to that observed with a plastic scintillator by at least a factor of 100, using a converter of metal, semiconductor (Ge), or glass for interaction with the muons penetrating through the metal housing of the detector. This detection process is due to transient formation of excited nuclei by the well-known process of muon capture, giving beta decay. The main experimental results shown here are in the form of beta electron energy spectra detected directly by the photomultiplier. Events which give a high-energy tail in the energy spectra are probably due to gamma photons from the muons. Sharp and intense x-ray peaks from a muonic aluminium converter or housing material are observed. The detection conversion in glass and Ge converters has a time constant of the order of many minutes to reach the final conversion level, while the process in metal converters is stabilized faster. The time constants are not due to lifetimes of the excited nuclei or neutrons but are due to internal charging in the insulating converter material. Interaction of this charging with the high voltage in the photomultiplier is observed.

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