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Jülich, Germany

Rumaiz A.K.,Brookhaven National Laboratory | Krings T.,Semikon Detector GmbH | Siddons D.P.,Brookhaven National Laboratory | Kuczewski A.J.,Brookhaven National Laboratory | And 4 more authors.
IEEE Transactions on Nuclear Science | Year: 2014

We have constructed a pixelated germanium detector using a technique which has been shown to provide good isolation between adjacent pixels. In this work we present initial tests of the application of a low-noise CMOS ASIC to read out this detector. The detector has 64 pixels, each $0.5~\hbox{mm}\times 5~\hbox{mm}$, arranged as a series of strips. It is connected by wire-bonds to two 32-channel application-specific integrated circuits (ASICs) which provide a complete photon-counting chain for every channel. Since the size of the pixel array is no longer restricted by the difficulties of instrumenting large channel-count conventional electronics, this development will open up the possibility of even larger arrays, similar to those offered by silicon detectors. © 1963-2012 IEEE.

Aramaki T.,Columbia University | Chan S.K.,Columbia University | Hailey C.J.,Columbia University | Kaplan P.A.,Columbia University | And 4 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2012

The General AntiParticle Spectrometer (GAPS) is a novel approach for indirect dark matter searches that exploits cosmic antideuterons. The GAPS detection method involves capturing antiparticles into a target material with the subsequent formation of an excited exotic atom. The exotic atom decays with the emission of atomic X-rays and charged particles from nuclear annihilation, which uniquely identifies the captured antiparticle. We are currently developing the lithium-drifted silicon (Si(Li)) detector for the GAPS flight experiment. In this paper, we describe the diagnostic tests conducted on three prototype Si(Li) detectors and the noise model to characterize each detector. The GAPS prototype flight, preparatory for a long duration balloon flight from Antarctica in 2016-2017, is scheduled for launch from Japan in summer 2012. © 2012 Elsevier B.V. All rights reserved.

Krings T.,Semikon Detector GmbH | Protic D.,Semikon Detector GmbH | Ross C.,Semikon Detector GmbH
IEEE Nuclear Science Symposium Conference Record | Year: 2012

Results of the first measurements on HPGe- and Si(Li)-detectors with an one dimensional fine pitch strip structure are presented. The position-sensitive structures were fabricated on implanted boron contacts by means of photolithography with a subsequent plasma etching. A group of 5 neighbouring strips of both detector types was examinated concerning the reverse current, resistance between a position-element and the neighbourhood and the response to the photons up to 60 keV. © 2011 IEEE.

Kibedi T.,Australian National University | Stuchbery A.E.,Australian National University | Ng M.,Australian National University | Krings T.,Semikon Detector GmbH | And 2 more authors.
IEEE Nuclear Science Symposium Conference Record | Year: 2012

The 3α (triple-alpha) process leading to the formation of stable carbon in the Universe is one of the most important nuclear astrophysical processes. The radiative width of the so called Hoyle-state, involving the 7.654 MeV E0 and the 3.215 MeV E2 transitions, is known with 12.5% accuracy. We report on the development of a Si(Li)-detector array for a new magnetic pair spectrometer, which will be used for the measurement of the pair conversion of the E0 and E2 transitions from the Hoyle-state. The results of the final detector tests will be presented. © 2012 IEEE.

Tartoni N.,Diamond Light Source | Crook R.,Diamond Light Source | Krings T.,Semikon Detector GmbH | Protic D.,Semikon Detector GmbH | And 6 more authors.
IEEE Transactions on Nuclear Science | Year: 2015

Multi-element germanium detectors for X-ray fluorescence are widely used in synchrotron experiments and in particular in XAFS experiments. This paper presents the construction and characterization of a demonstrator built to investigate the viability of multi-element monolithic germanium detectors equipped with CMOS front-end electronics. Semikon Detector GmbH fabricated a germanium sensor segmented with a pad pattern with pad size 1 × 1 mm2. 16 channels were instrumented with the CUBE preamplifiers developed at XGLab Srl. The detector was tested with radioactive sources and with the synchrotron X-ray beam of Diamond. The results showed spectra with energy resolution satisfactory for XAFS experiments but with a considerable tail. The low energy tail was proved to be due to charge sharing. In addition the spectra showed the peak stability as a function of counting rate better than 1% for rate up to 838 kcps. The non-linearity of the peak position vs. energy was estimated to be a maximum of 0.13% No evidence of charge loss in the crystal was identified. This work proved that this technology is a viable option to improve the throughput of germanium fluorescence detectors as long as methods to reduce events leading to charge sharing are in place. © 2015 IEEE.

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