%0 Journal Article %1 REGIS201672 %A Régis, J.-M. %A Saed-Samii, N. %A Rudigier, M. %A Ansari, S. %A Dannhoff, M. %A Esmaylzadeh, A. %A Fransen, C. %A Gerst, R.-B. %A Jolie, J. %A Karayonchev, V. %A Müller-Gatermann, C. %A Stegemann, S. %D 2016 %J Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment %K myown %P 72 - 82 %R https://doi.org/10.1016/j.nima.2016.04.010 %T Reduced γ–γ time walk to below 50 ps using the multiplexed-start and multiplexed-stop fast-timing technique with LaBr3(Ce) detectors %U http://www.sciencedirect.com/science/article/pii/S016890021630170X %V 823 %X Abstract The electronic γ–γ fast-timing technique using arrays consisting of many LaBr3(Ce) detectors is a powerful method to determine lifetimes of nuclear excited states with a lower limit of about 5ps. This method requires the determination of the energy-dependent time walk of the zero time which is represented by the centroid of a prompt γ–γ time distribution. The full-energy peak versus full-energy peak prompt response difference which represents the linearly combined mean γ–γ time walk of a fast-timing array consisting of 8 LaBr3(Ce) detectors was measured using a standard 152Eu γ-ray source for the energy region of 40–1408keV. The data were acquired using a “multiplexed-start and multiplexed-stop” analogue electronics circuitry and analysed by employing the generalized centroid difference method. Concerning the cylindrical 1.5in.×1.5in. LaBr3(Ce) crystals which are coupled to the Hamamatsu R9779 photomultiplier tubes, the best fast-timing array time resolution of 202(3)ps is obtained for the two prompt γ lines of 60Co by using the leading-edge timing principle. When using the zero-crossover timing principle the time resolution is degraded by up to 30%, dependent on the energy and the shaping delay time of the constant fraction discriminator model Ortec 935. The smallest γ–γ time walk to below 50ps is obtained by using a shaping delay time of about 17ns and an optimum “time-walk adjustment” needed for detector output pulses with amplitudes smaller than 400mV.

@article{REGIS201672, abstract = {Abstract The electronic γ–γ fast-timing technique using arrays consisting of many LaBr3(Ce) detectors is a powerful method to determine lifetimes of nuclear excited states with a lower limit of about 5ps. This method requires the determination of the energy-dependent time walk of the zero time which is represented by the centroid of a prompt γ–γ time distribution. The full-energy peak versus full-energy peak prompt response difference which represents the linearly combined mean γ–γ time walk of a fast-timing array consisting of 8 LaBr3(Ce) detectors was measured using a standard 152Eu γ-ray source for the energy region of 40–1408keV. The data were acquired using a “multiplexed-start and multiplexed-stop” analogue electronics circuitry and analysed by employing the generalized centroid difference method. Concerning the cylindrical 1.5in.×1.5in. LaBr3(Ce) crystals which are coupled to the Hamamatsu R9779 photomultiplier tubes, the best fast-timing array time resolution of 202(3)ps is obtained for the two prompt γ lines of 60Co by using the leading-edge timing principle. When using the zero-crossover timing principle the time resolution is degraded by up to 30%, dependent on the energy and the shaping delay time of the constant fraction discriminator model Ortec 935. The smallest γ–γ time walk to below 50ps is obtained by using a shaping delay time of about 17ns and an optimum “time-walk adjustment” needed for detector output pulses with amplitudes smaller than 400mV.}, added-at = {2018-01-20T22:22:58.000+0100}, author = {Régis, J.-M. and Saed-Samii, N. and Rudigier, M. and Ansari, S. and Dannhoff, M. and Esmaylzadeh, A. and Fransen, C. and Gerst, R.-B. and Jolie, J. and Karayonchev, V. and Müller-Gatermann, C. and Stegemann, S.}, biburl = {https://www.bibsonomy.org/bibtex/2f3ca630db3c852567d653c68e6acab94/ikpcologne}, description = {Reduced γ–γ time walk to below 50 ps using the multiplexed-start and multiplexed-stop fast-timing technique with LaBr3(Ce) detectors - ScienceDirect}, doi = {https://doi.org/10.1016/j.nima.2016.04.010}, interhash = {c1f117596fec8d9460096432b55706c0}, intrahash = {f3ca630db3c852567d653c68e6acab94}, issn = {0168-9002}, journal = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, keywords = {myown}, pages = {72 - 82}, timestamp = {2018-01-20T22:22:58.000+0100}, title = {Reduced γ–γ time walk to below 50 ps using the multiplexed-start and multiplexed-stop fast-timing technique with LaBr3(Ce) detectors}, url = {http://www.sciencedirect.com/science/article/pii/S016890021630170X}, volume = 823, year = 2016 }