Search results for "fast-timing"
showing 3 items of 3 documents
Investigation of LaBr3(Ce) detectors at the RITU focal plane
2015
The aims of this master thesis were to determine the absolute detection efficiency of the LaBr3(Ce) detectors installed at the RITU focal plane, to study the effect of planar Ge-detector on the LaBr3(Ce) efficiency and to investigate the possibility of half-life measurements with the detectors in a coincidence setup having distributed recoil ions produced by the RITU separator. Time spectra were collected by moving a point radioactive source from one edge of the implantation detector to the other to imitate the ion distribution from the RITU separator. Simulations have been exploited to explore the time spectra obtained from various ion distribution shapes and for different half-lives. A po…
A time-of-flight correction procedure for fast-timing data of recoils with varying implantation positions at a spectrometer focal plane
2019
Abstract Fast-timing measurements at the focal plane of a separator can suffer from poor timing resolution. This is due to the variations in time-of-flight (ToF) for photons travelling to a given detector, which arise from the changes in the implantation positions of the recoil nuclei emitting the γ rays of interest. In order to minimise these effects on timing measurements, a procedure is presented that improves fast-timing data by performing ToF corrections on an event-by-event basis. This method was used to correct data collected with an array of eight LaBr 3 detectors, which detected γ rays from spatially distributed 138Gd recoil-implants at the focal plane of the Recoil-Ion-Transport-U…
Fast-timing study of the l-forbidden 1/2+ -> 3/2+ M1 transition in 129Sn
2016
The levels in 129Sn populated from the β− decay of 129In isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 1/2+ state and the 3/2+ ground state in 129Sn are expected to have configurations dominated by the neutron s1/2 (l = 0) and d3/2 (l = 2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow l-forbidden M1 transition. Using fast-timing spectroscopy we have measured the half-life of the 1/2+ 315.3-keV state, T1/2 = 19(10) ps, which corresponds to a moderately fast M1 transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effect…