Doppler-shift attenuation lifetime measurement of the Ar3621+ level

Abstract

At TRIUMF, the TIGRESS Integrated Plunger device and its suite of ancillary detector systems have been implemented for charged-particle tagging and light-ion identification in coincidence with γ -ray spectroscopy for Doppler-shift lifetime studies and low-energy Coulomb excitation measurements. As a test of the device, the lifetime of the first 2 + excited state in 36Ar was measured from the γ -ray line shape of the 2transition using the Doppler-shift attenuation technique following Coulomb excitation. The line-shape signatures, vital for precision lifetime measurements, were significantly improved by enhanced reaction-channel selectivity using a complementary approach of kinematic gating and digital rise-time discrimination of recoiling charged particles in a silicon PIN diode array. The lifetime was determined by comparisons between the data and simulated line shapes generated using our TIGRESS Coulomb excitation code as an input to the Lindhard method, which was then extended and included as a class in GEANT4. The model-independent lifetime result of 490 ± 50 fs corresponds to a reduced quadrupole transition strength of B(E2; 2

One‐Pot Preparation of a TiO2/Cu2ZnSnS4 Heterojunction and its Photocatalytic Activity

“…One of the quaternary metal sulfides, Cu 2 ZnSnS 4 (CZTS) has attracted a lot of attention because of its possible viability as a material in transparent conductive electrodes, thin film transistors, and thin film solar cells . It also has very high economic feasibility since it is made of copper, zinc, and tin, three of the most abundant elements in the Earth's crust.…”