A new four channel pulse shape discriminator

Ruben, A.; Hoagland, T.; Fox, Ron; Kerr, P. L.; Montermann, G.; Schneider, Ralf

doi:10.1109/nssmic.2007.4436424

Cited by 12 publications

(8 citation statements)

References 1 publication

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“…The neutron detectors were mounted side by side 17.5 cm from the center of the LEU cube as shown in Figure . The liquid scintillator signal has two light decay time constants that can be used to discriminate signals due to gammas (fast) and neutrons (slow). The Mesytec NIM module MPD-4 was used to discriminate between gammas and neutron signals using Pulse Shape Discrimination (PSD) techniques, as described in [28]. In particular, the module was calibrated using fission neutrons from a 252 Cf source and gammas from a 137 Cs source and its neutron-trigger output was fed to a dedicated input on the MMT digitizing boards.…”

Section: Methodsmentioning

confidence: 99%

Detecting special nuclear material using muon-induced neutron emission

Guardincerri

Bacon

Borozdin

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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Abstract. The penetrating ability of cosmic ray muons makes them an attractive probe for imaging dense materials. Here, we describe experimental results from a new technique that uses neutrons generated by cosmic-ray muons to identify the presence of special nuclear material (SNM). Neutrons emitted from SNM are used to tag muon-induced fission events in actinides and laminography is used to form images of the stopping material. This technique allows the imaging of SNMbearing objects tagged using muon tracking detectors located above or to the side of the objects, and may have potential applications in warhead verification scenarios. During the experiment described here we did not attempt to distinguish the type or grade of the SNM.

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Section: Methodsmentioning

confidence: 99%

Detecting special nuclear material using muon-induced neutron emission

Guardincerri

Bacon

Borozdin

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…The neutron detector consisted of a p-terphenyl crystal [2], 8 cm in diameter and 5 cm thick, coupled by a quartz window and optical interface to a 76 mm Photonis XP4312 photomultiplier tube. The negative anode signal was split in two, with the larger part supplied to the Mesytec MPD-4 module [3] which provided the pulse shape (PS) signal into the amplitude-to-digital converter (ADC) and the start signal for the time-to-amplitude converter (TAC). The smaller part of the signal (1/200) was fed into a charge sensitive preamplifier (QPA), amplified with a shaping time of 1µs and the bipolar output was connected to the ADC for pulse height (PH) measurements.…”

Section: Methodsmentioning

confidence: 99%

Neutron detector characterization for SCINTIA array

Matei¹,

Hambsch²,

Oberstedt³

2011

2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications

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SCINTIA is a new detector array of organic scintillators under development at the Institute for Reference Materials and Measurements (IRMM). The present design of SCINTIA includes NE213, p-terphenyl and Li glass neutron detectors positioned in a spherical configuration around the target. The properties of a novel p-terphenyl neutron detector to be used with SCINTIA have been investigated using photon sources and neutrons from a time tagged 252 Cf(sf) source. The results show that the p-terphenyl crystal has better energy resolution, increased proton light output and neutron efficiency when compared to a similar size NE213 equivalent neutron detector.

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“…[6]. This target was placed at the center of the liquid scintillator (BC-501A) The pulses from the detectors were processed using analog electronics built around Mesytec MPD-4 modules [12]. CAEN Analog to Digital Converters (ADCs) and Time to Digital Converters (TDCs) were used to digitize and store the outputs of the MPD-4 modules for offline analysis.…”

Section: Experimental Descriptionmentioning

confidence: 99%

Polarization asymmetries in theBe9(γ,n0)reaction

et al. 2015

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Measurements of the 9 Be(γ,n 0 ) reaction were performed using nearly 100% linearly polarized, high-intensity, and nearly-monoenergetic γ-ray beams having energies between 5.5 MeV and 15.5MeV at the High Intensity γ-ray Source (HIγS) located at Duke University and Triangle Universities Nuclear Laboratory. Eighteen liquid scintillator detectors were used to measure neutron yields parallel and perpendicular to the plane of beam polarization. Polarization asymmetries, which are the differences between yields observed in detectors located in-plane and out-of-plane divided by their sums, were measured for the neutrons which left the residual nucleus ( 8 Be) in its ground state, termed the n 0 group. Asymmetries between 0.4 to 0.7 were discovered over this energy region in addition to a clear trend of increasing asymmetries with increasing beam energy. A prediction of the polarization asymmetry based on a pure E1 direct capture model shows good agreement with the experimental measurements. These data and the prediction could be of interest for methods that rely on neutron measurements following photofission to identify the presence of special nuclear material.

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A new four channel pulse shape discriminator

Cited by 12 publications

References 1 publication

Detecting special nuclear material using muon-induced neutron emission

Detecting special nuclear material using muon-induced neutron emission

Neutron detector characterization for SCINTIA array

Polarization asymmetries in theBe9(γ,n0)reaction

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