A survey of the physical processes which determine the response function of silicon detectors to alpha particles

Steinbauer, E.; Bortels, G.; Bauer, Péter; Biersack, J.P.; Burger, P.; Ahmad, I.

doi:10.1016/0168-9002(94)91787-6

Cited by 46 publications

(11 citation statements)

References 15 publications

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“…The complexity of estimating the overall effect of these factors, especially given the use of a thick degrader, together with the potential sensitivity of the subsequent analysis on correct determination of the energies and energy resolutions, warranted the development of a dedicated Monte Carlo simulation of the above effects. Energy losses, energy straggling and angular straggling were based on SRIM2008.04 [12], the intrinsic energy resolution of the detectors was 15 keV for protons and 25 keV for alpha particles [13], and the beam divergence (0.5 degrees) and beam spot size (10 mm) were determined during the experiment. Target and degrader thicknesses were determined with calibrated alpha-particle energy loss measurements and cross-checked by measurements of mass per unit area.…”

Section: Figmentioning

confidence: 99%

Resonances in19Ne with relevance to the astrophysically important18F(p,
Mountford
¹
,
Murphy
²
,
Achouri
³

et al. 2012
Phys. Rev. C

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The most intense gamma-ray line observable from novae is likely to be from positron annihilation associated with the decay of 18 F. The uncertainty in the destruction rate of this nucleus through the 18 F(p,α) 15 O reaction presents a limit to interpretation of any future observed gamma-ray flux. Direct measurements of the cross section of both this reaction and the 18 F(p,p) 18 F reaction have been performed between center of mass energies of 0.5 and 1.9 MeV. Simultaneous fits to both data sets with the R-Matrix formalism reveal several resonances, with the inferred parameters of populated states in 19 Ne in general agreement with previous measurements. Of particular interest, extra strength has been observed above ECM ∼1.3 MeV in the 18 F(p,p) 18 F reaction and between 1.3-1.7 MeV in the 18 F(p,α) 15 O reaction. This is well described by a broad 1/2 + state, consistent with both a recent theoretical prediction and an inelastic scattering measurement. The astrophysical implications of a broad sub-threshold partner to this state are discussed.

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Section: Figmentioning

confidence: 99%

Resonances in19Ne with relevance to the astrophysically important18F(p,
Mountford
¹
,
Murphy
²
,
Achouri
³

et al. 2012
Phys. Rev. C

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“…This is generally done by applying the Gaussian energy broadening (GEB) method (Xu and Eckerman, 2009), via multiplication of each individual energy bin value with a normalized Gaussian function. It is noted that, however, when just considering the behavior of the silicon detector the response is not strictly Gaussian (Steinbauer et al, 1994). The standard deviation s of the applied Gaussian, is related to the FWHM energy resolution DE of the detector system via DE ¼ 2 ffiffiffiffiffiffiffiffiffiffiffiffi ffi 2 ln 2 p s. The energy resolution of the system was experimentally determined to be DE ¼ 200 keV for device with Geo1 and DE ¼ 150 keV for device with Geo2.…”

Section: Energy Spectra Dependence On Electronicsmentioning

confidence: 99%

Monte Carlo simulation of semiconductor detector response to 222Rn and 220Rn environments

Irlinger

Trinkl

Wielunksi

et al. 2016

Journal of Environmental Radioactivity

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A new electronic radon/thoron monitor employing semiconductor detectors based on a passive diffusion chamber design has been recently developed at the Helmholtz Zentrum München (HMGU). This device allows for acquisition of alpha particle energy spectra, in order to distinguish alpha particles originating from radon and radon progeny decays, as well as those originating from thoron and its progeny decays. A Monte-Carlo application is described which uses the Geant4 toolkit to simulate these alpha particle spectra. Reasonable agreement between measured and simulated spectra were obtained for both (220)Rn and (222)Rn, in the energy range between 1 and 10 MeV. Measured calibration factors could be reproduced by the simulation, given the uncertainties involved in the measurement and simulation. The simulated alpha particle spectra can now be used to interpret spectra measured in mixed radon/thoron atmospheres. The results agreed well with measurements performed in both radon and thoron gas environments. It is concluded that the developed simulation allows for an accurate prediction of calibration factors and alpha particle energy spectra.

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“…The alpha spectroscopy electronics used here was only sensitive from 3 -6 MeV which does not allow a direct measurement of the conversion electron spectra. However, it is widely accepted that the structure on the high-energy side distribution of 241 Am alpha spectroscopy is mainly due to alpha-CE coincidences [1], [6], [7] and not alpha-photon coincidences. This is due to the high detection efficiency of a silicon detector of an electron as compared to a photon.…”

Section: Experimental Measurementsmentioning

confidence: 99%

Alpha coincidence spectroscopy studied with GEANT4

Dion

Miller

Tatishvili

et al. 2013

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

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The high-energy side of peaks in alpha spectra, e.g. 241 Am, as measured with a silicon detector has structure caused mainly by alpha-conversion electron and to some extent alphagamma coincidences. We compare GEANT4 simulation results to 241 Am alpha spectroscopy measurements with a passivated implanted planar silicon detector. A discrepancy between the measurements and simulations suggest that the GEANT4 photon evaporation database for 237 Np (daughter of 241 Am decay) does not accurately describe the conversion electron spectrum and therefore was found to have discrepancies with experimental measurements. We describe how to improve the agreement between GEANT4 and alpha spectroscopy for actinides of interest by including experimental measurements of conversion electron spectroscopy into the photon evaporation database.Index Terms-alpha spectrometry, GEANT4, conversion electrons.

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A survey of the physical processes which determine the response function of silicon detectors to alpha particles

Cited by 46 publications

References 15 publications

Resonances in19Ne with relevance to the astrophysically important18F(p,
Mountford
¹
,
Murphy
²
,
Achouri
³

et al. 2012
Phys. Rev. C

Resonances in19Ne with relevance to the astrophysically important18F(p,
Mountford
¹
,
Murphy
²
,
Achouri
³

et al. 2012
Phys. Rev. C

Monte Carlo simulation of semiconductor detector response to 222Rn and 220Rn environments

Alpha coincidence spectroscopy studied with GEANT4

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A survey of the physical processes which determine the response function of silicon detectors to alpha particles

Cited by 46 publications

References 15 publications

Resonances in19Ne with relevance to the astrophysically important18F(p,Mountford1, Murphy2, Achouri3 et al. 2012Phys. Rev. C

Resonances in19Ne with relevance to the astrophysically important18F(p,Mountford1, Murphy2, Achouri3 et al. 2012Phys. Rev. C

Monte Carlo simulation of semiconductor detector response to 222Rn and 220Rn environments

Alpha coincidence spectroscopy studied with GEANT4

Contact Info

Product

Resources

About

Resonances in19Ne with relevance to the astrophysically important18F(p,
Mountford
¹
,
Murphy
²
,
Achouri
³

et al. 2012
Phys. Rev. C

Resonances in19Ne with relevance to the astrophysically important18F(p,
Mountford
¹
,
Murphy
²
,
Achouri
³

et al. 2012
Phys. Rev. C