Validation of the Geant4 electromagnetic photon cross-sections for elements and compounds

Cirrone, G.A.P.; Cuttone, G.; Rosa, F. Di; Pandola, L.; Romano, F.; Zhang, Q.

doi:10.1016/j.nima.2010.02.112

Cited by 96 publications

(69 citation statements)

References 24 publications

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“…The model nuabs is an absorption model for the detector with cross-sections created by GEANT4 (Agostinelli et al 2003). The adopted photon interaction is the Livermore low-energy EM model based on the evaluated photon data library, EPDL97 (Cirrone et al 2010). The model has four parameters: the thickness of Pt, CZT (CdZnTe), and Zn, and the Cd ratio.…”

Section: Resultsmentioning

confidence: 99%

Measurement of the Absolute Crab Flux with NuSTAR

Madsen

Grefenstette

Harrison

et al. 2017

ApJ

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We present results from a Nuclear Spectroscopic Telescope Array (NuSTAR) observation of the Crab made at a large off-axis angle of 1°. 5. At these angles, X-rays do not pass through the optics and instead illuminate the detectors directly, due to incomplete baffling. Due to the simplicity of the instrument response in this configuration and the good absolute calibration of the detectors, we are able to measure the absolute intrinsic flux of the Crab to better than 4%. We find the spectral parameters of the power law to be 2.106 0.006 G =  , N 9.71 0.16 =  , in agreement with the values measured 42 years ago by Toor & Seward. This suggests that the observed variability of the Crab is not part of a long-term trend, but instead results from fluctuations around a steady mean. The NuSTAR observation also enabled improved measurement of the detector absorption parameters without the added complications of the mirror response.

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Section: Resultsmentioning

confidence: 99%

Measurement of the Absolute Crab Flux with NuSTAR

Madsen

Grefenstette

Harrison

et al. 2017

ApJ

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“…To investigate this detector absorption, we built an XSPEC absorption model with cross-sections created by Geant4. The adopted photon interaction model is the Livermore lowenergy EM model based on the evaluated photon data library, EPDL97 (Cirrone et al 2010).…”

Section: Detector Absorption Correctionmentioning

confidence: 99%

CALIBRATION OF THE NuSTAR HIGH-ENERGY FOCUSING X-RAY TELESCOPE

Madsen

Harrison

Markwardt

et al. 2015

ApJS

336

266

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We present the calibration of the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray satellite. We used the Crab as the primary effective area calibrator and constructed a piece-wise linear spline function to modify the vignetting response. The achieved residuals for all off-axis angles and energies, compared to the assumed spectrum, are typically better than ±2% up to 40 keV and 5-10 % above due to limited counting statistics. An empirical adjustment to the theoretical 2D point spread function (PSF) was found using several strong point sources, and no increase of the PSF half power diameter (HPD) has been observed since the beginning of the mission. We report on the detector gain calibration, good to 60 eV for all grades, and discuss the timing capabilities of the observatory, which has an absolute timing of ± 3 ms. Finally we present cross-calibration results from two campaigns between all the major concurrent X-ray observatories (Chandra, Swift, Suzaku and XMM-Newton), conducted in 2012 and 2013 on the sources 3C 273 and PKS 2155-304, and show that the differences in measured flux is within ∼10% for all instruments with respect to NuSTAR. Subject headings: space vehicles: instruments -X-rays: individual (3C 273) -X-rays: individual (PKS 2155-304)

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“…The uncertainty related to the MC simulation arises from the precision of the experimental geometry model implemented in MaGe (1 %) and from the accuracy of particle tracking (2 %) performed by Geant4 [50][51][52][53][54]. The uncertainty on the particle tracking was estimated as reported in Ref.…”

Section: (Ii) MC Simulationmentioning

confidence: 99%

Results on $$\beta \beta $$ β β decay with emission of two neutrinos or Majorons in $$^{76}$$ 76 Ge from GERDA Phase I

Agostini¹,

Allardt²,

Bakalyarov³

et al. 2015

Eur. Phys. J. C

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A search for neutrinoless ββ decay processes accompanied with Majoron emission has been performed a e-mail: gerda-eb@mpi-hd.mpg.de using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with 123 416 Page 2 of 12 Eur. Phys. J. C (2015) 75 :416 spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10 23 yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with 76 Ge. A new result for the half-life of the neutrino-accompanied ββ decay of 76 Ge with significantly reduced uncertainties is also given, resulting in T 2ν 1/2 = (1.926 ± 0.094) × 10 21 yr.

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Validation of the Geant4 electromagnetic photon cross-sections for elements and compounds

Cited by 96 publications

References 24 publications

Measurement of the Absolute Crab Flux with NuSTAR

Measurement of the Absolute Crab Flux with NuSTAR

CALIBRATION OF THE NuSTAR HIGH-ENERGY FOCUSING X-RAY TELESCOPE

Results on $$\beta \beta $$ β β decay with emission of two neutrinos or Majorons in $$^{76}$$ 76 Ge from GERDA Phase I

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