We report on evanescently coupled Ge waveguide photodetectors that are grown on top of Si rib waveguides. A Ge waveguide detector with a width of 7.4mum and length of 50 mum demonstrated an optical bandwidth of 31.3 GHz at -2V for 1550nm. In addition, a responsivity of 0.89 A/W at 1550 nm and dark current of 169 nA were measured from this detector at -2V. A higher responsivity of 1.16 A/W was a...

Rapid yet accurate measurement of the I activity in the thyroid gland as well as in the air, water and vegetation may have an important role in obtaining quantitative information on internal doses for the people living in the vicinity of nuclear facilities shortly after an accidental release of radionuclides (1-2). Whole body counting technique is still the standard method for measuring radionu...

Abstract $$\gamma $$ γ -ray tracking is based on a new generation of position sensitive high-purity germanium (HPGe) detectors. A novel type cluster detector was successfully developed and assembled for the high-resolution spectrometer Advanced Gamma Tracking Array AGATA. The core part consists three encapsul...

An optimum algorithm to find interaction positions of a γ-ray in a Ge-detector is being investigated by analyzing pulse shapes of the Ge-detector VEGA [1, 2]. The VEGA detector consists of four Ge crystals forming like a four leaf clover. Each crystal has four electric segmentations in radial quarters. A collection time of electron and hole (eh) depends on their drift length, therefore the slop...

A straightforward enantiomerically pure synthesis of the heterocyclic core of the D-series GE2270 is reported. The synthetic strategy combines the Hantzsch thiazole's building condensation with a cross-coupling reaction including direct C-H hetarylation to build and connect step-by-step thiazolyl moieties to the 5-bromopicolinate as readily available starting material.

The EXOGAM clover detector consists of four high-purity germanium (HPGe) crystals in a common cryostat. Each individual crystal is electrically segmented into four regions. We propose a method based on a multidimensional fitting procedure to calibrate the energy from the segments. This method could be used for any kind of segmented germanium detector. Its application to the EXOGAM clover is dis...

The decay rate of 7Be depends on the electron density at the nucleus and therefore may vary with the chemical environments of the Be atom. Using a 100% efficiency high-purity germanium detector, the decay constants of Be in Be2C(OH2)4, Be(OH)2 and BeO have been measured at unprecedented high precision (of š0.01%), resulting in T1=2 D 53.69 d, 53.42 d, and 54.23 d, respectively. The observed dif...

years. however, the nature and initial factors associated with this serious health problem have not been studied yet. methods: to understand this issue, a cross-sectional study was conducted and sixty treatment and nontreatment seekers who met the diagnostic and statistical manual of mental disorders, 4th ed., text revision (dsm.iv-tr) criteria for drug dependence with mean age of 28.7 (± 8.3) ...

The nuclear reaction Ne(p, γ)Na has been investigated in the astrophysical interesting energy region from Ep = 600 keV to Ep = 1400 keV. Furthermore several resonances of the reaction Al(p, γ)Si have been measured in an energy range of Ep = 400 keV to Ep = 1400 keV to determine the calibration and efficiency of the detector setup. The experiments and corresponding measurements have been perform...