Supported by the National Natural Science Foundation of China(Nos.11175171,10835006,11105139 and 10975133)
A digital three-detector positron lifetime spectrometer was developed.It consists of a DRS4 waveform digitizing board and three La Br3scintillation detectors coupled to XP2020Q photomultiplier tubes.DRS4 waveform digi...
Supported by National Natural Science Foundation of China(11175171,10835006,11105139,10975133)
A new simple digital positron lifetime spectrometer has been developed. It includes a DRS4 waveform digitizing board and two scintillation detectors based on the XP2020Q photomultiplier tubes and LaBr3 scintillators. ...
supported by National Natural Science Foundation of China (No.10835006)
Coincidence Doppler broadening measurements of positron annihilation for multi- walled carbon nanotubes, double-walled carbon nanotubes, single-walled carbon nanotubes and graphite were performed. The ratio curves of ...
Supported by Major Program of National Natural Science Foundation of China (10835006);National Natural Science Foundation of China (10675114)
A new slow pulsed positron beam, including a positron source, a moderator, a chopper, a prebuncher, a main-buneher and a sample chamber, etc, has been installed and tested. It is necessary to simulate the acceleration...
supported by the National Natural Science Foundation of China (Grant No. 10835006);the "211 Project" for Key Discipline Construction in University of Science and Technology of China
This paper studies the pressure-induced phase transition between zincblende (B3) and NaC1 (B1) structure ZnSe by using the hydrostatic pressure first-principles pseudopotential plane wave method. The energy-volume...
Project supported by the National Natural Science Foundation of China (Grant No. 10835006)
Based on the atomic superposition approximation (ATSUP) and first-principles pseudopotential plane-wave methods, the bulk and Mg mono-vacancy positron lifetime of magnesium oxide were calculated using Arponen-Pajamm...