Neutron interactions as seen by a segmented germanium detector

Abt, I.; Caldwell, A.; Kroeninger, K.; Liu, J.; Liu, X.; Majorovits, B.

doi:10.1140/epja/i2007-10553-8

Cited by 21 publications

(22 citation statements)

References 12 publications

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“…The good agreement between MaGe and data obtained for segmented detectors was demonstrated previously for photon and neutron induced events [8,19] in the range of ≈20 keV to ≈10 MeV.…”

Section: Simulation Proceduressupporting

confidence: 85%

Pulse shape simulation for segmented true-coaxial HPGe detectors

et al. 2010

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A new package to simulate the formation of electrical pulses in segmented true-coaxial high purity germanium detectors is presented. The computation of the electric field and weighting potentials inside the detector as well as of the trajectories of the charge carriers is described. In addition, the treatment of bandwidth limitations and noise are discussed. Comparison of simulated to measured pulses, obtained from an 18-fold segmented detector operated inside a cryogenic test facility, are presented.

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“…The good agreement between MaGe and data obtained for segmented detectors was demonstrated previously for photon and neutron induced events [8,19] in the range of ≈20 keV to ≈10 MeV.…”

Section: Simulation Proceduressupporting

confidence: 85%

Pulse shape simulation for segmented true-coaxial HPGe detectors

et al. 2010

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“…Some of these neutrons undergo (n,n') scattering in the Ge crystals of the γ-ray detectors. The effect on γ rays emitted from the recoiling Ge isotopes manifests itself as a high-energy tail of ∼100 keV in the γ-ray spectra [26]. As such, gated γ-ray transitions (582-and 852-keV in our case) that lie on the recoil tails (from 834-and 563-keV 2…”

Section: Novel Methodsmentioning

confidence: 63%

γ-ray decay from neutron-bound and unbound states inMo95and a novel technique for spin determination

et al. 2016

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The emission of γ rays from neutron-bound and neutron-unbound states in 95 Mo, populated in the 94 Mo(d,p) reaction, has been investigated. Charged particles and γ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing proton-γ and proton-γ-γ coincidences, the 95 Mo level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below ≈2 MeV. From proton-γ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d,p) reaction above the neutron separation energy. Spins for almost all 95 Mo levels below 2 MeV (and for a few levels above) have been determined with this method.

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“…After a muon 4 The energy of gammas from neutron capture on hydrogen in the simulation is ≈ 1 keV higher than the literature value of 2223.26 keV [11]. This bug is already known and was reported to the Geant4 collaboration [21]. tag a signal time window, ∆t Exp S , from 7 µs to 1 ms is opened.…”

Section: Extraction Of Measured Neutron Signalmentioning

confidence: 80%

Muon-induced neutrons in lead and copper at shallow depth

Kneißl

Caldwell

et al. 2019

Astroparticle Physics

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Next generation low-background experiments require a detailed understanding of all possible radiation backgrounds. One important radiation source are muon-induced neutrons. Their production processes are up to now not fully understood. New measurements with MINIDEX (Muon-Induced Neutron Indirect Detection EXperiment) of the production of neutrons by cosmogenic muons in high-Z materials are reported. The setup is located at the Tübingen Shallow Underground Laboratory, which provides a vertical shielding depth of (13.2 ± 0.8) meter water equivalent at the setup location. Muon-induced neutrons are identified by the detection of 2.2 MeV gammas from their capture on hydrogen with high-purity germanium detectors.The experimental results were compared to Geant4 Monte Carlo predictions. The measured rate of 2.2 MeV neutron capture gammas for lead was found to be in good agreement with the Geant4 predicted rate. An external neutron yield of (7.2 + 0.7 − 0.6 ) · 10 −5 g −1 cm 2 neutrons per tagged muon was determined for lead with the help of Geant4. For copper the measured rate was found to be a factor of 0.72 ± 0.14 lower than the Geant4 predicted rate. Using this factor an external neutron yield of (2.1 ± 0.4) · 10 −5 g −1 cm 2 neutrons per tagged muon was obtained for copper.An additional simulation was performed using the FLUKA Monte Carlo code. The FLUKA predicted rate of detected 2.2 MeV neutron capture gammas for lead was also found to be in good agreement with the experimental value. A detailed comparison of muon interactions and neutron production in lead for Geant4 and FLUKA revealed large discrepancies in the description of photo-nuclear and muon-nuclear inelastic scattering reactions for muon energies at shallow underground sites. These results suggest that Geant4, when used with Geant4 recommended or standard physics lists, underpredicts the neutron production in photo-nuclear inelastic scattering reactions while at the same time it overpredicts the neutron production in muon-nuclear inelastic scattering reactions.

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Neutron interactions as seen by a segmented germanium detector

Cited by 21 publications

References 12 publications

Pulse shape simulation for segmented true-coaxial HPGe detectors

Pulse shape simulation for segmented true-coaxial HPGe detectors

γ-ray decay from neutron-bound and unbound states inMo95and a novel technique for spin determination

Muon-induced neutrons in lead and copper at shallow depth

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