Hongmei Zhang - IEEE Xplore Author Profile

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In this paper, we report the characteristics and the performance of the hybrid plastic scintillators for slow neutron measurements. The 10B-doped and Gd-layered scintillators were manufactured and tested for slow and fast neutrons, and gamma rays. The slow neutrons were provided by an energy moderation of the fast neutrons emitted from a 0.5 Ci 252Cf source. The energy of the slow neutrons ranged ...Show More
We report on results of a cosmic ray test of a scintillating fiber tracker using Visible Light Photon Counter (VLPC) readout. Two different detector configurations have been constructed and operated, the first with a total of 3072 channels and the second with 1,785 channels. The 3072 channel system is a prototype for the DO detector tracking upgrade and represents a configuration that is similar t...Show More
A tracking detector using scintillating fibers is being developed for the D0 collaboration at Fermilab. The scintillating fibers will be coupled to clear fibers that will transport light to the photodetectors. We have developed connectors which couple the two types of fibers. The first 128-channel prototypes were machined using Delrin plastic to have v-shaped grooves. Fibers were glued into the gr...Show More
A large scale scintillating fiber tracker using visible light photon counter (VLPC) readout was built as a prototype far the upgraded DO central tracker. This prototype has been under test at Fermilab for six months using cosmic rays. A description of the components of the tracker including the photodetector, fibers, lightguides, ribbons, and DAQ is given. Preliminary results on detected photon yi...Show More
A fast neutron spectrometer by recoil proton detection method was developed. The spectrometer is consisted of a radiator and an integrated dE-E Si detector, in which an epitaxial dE counter of less than 10 μm and an E counter are incorporated. Recoil protons from the radiator can easily be identified from γ ray background; and besides each recoil proton angle can be determined by the dE and E coun...Show More
The epitaxial integrated E-dE position sensitive silicon detector has been developed as an extension of the epitaxial integrated E-dE silicon detector. The charge dividing resistor is produced by evaporation of Pd on the E side of the detector. This Pd evaporated layer acts as the surface barrier electrode of the E detector. The good position sensing characteristics will be expected by using the c...Show More
A position sensitive detector has been made on a N-type epitaxial silicon wafer using the epitaxial layer as the uniform resistive layer. The surface barrier electrode is produced on the opposite side of the epitaxial layer by evaporation of gold. The position sensitive detector obtained has good characteristics and moreover it is easy to fabricate. So that the epitaxial technique will be promisin...Show More