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The Generalized Centroid Difference method for lifetime measurements via gamma-gamma coincidences using large fast-timing arrays.



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Mach Henryk, Andrzej and Fraile Prieto, Luis Mario (2015) The Generalized Centroid Difference method for lifetime measurements via gamma-gamma coincidences using large fast-timing arrays. In CGS15 - Capture Gamma-Ray Spectroscopy and Related Topics. EPJ Web of Conferences (93). EDP Sciences. ISBN 978-2-7598-1794-8

[thumbnail of Fraile Prieto 04 libre + CC.pdf]
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Official URL: http://dx.doi.org/10.1051/epjconf/20159301013


A novel method for direct electronic "fast-timing" lifetime measurements of nuclear excited states via gamma-gamma coincidences using an array equipped with N very fast high-resolution LaBr3(Ce) scintillator detectors is presented. The generalized centroid difference method provides two independent "start" and "stop" time spectra obtained without any correction by a superposition of the N(N - 1)/2 calibrated gamma-gamma time difference spectra of the N detector fast-timing system. The two fast-timing array time spectra correspond to a forward and reverse gating of a specific gamma-gamma cascade and the centroid difference as the time shift between the centroids of the two time spectra provides a picosecond-sensitive mirror-symmetric observable of the set-up. The energy-dependent mean prompt response difference between the start and stop events is calibrated and used as a single correction for lifetime determination. These combined fast-timing array mean gamma-gamma zero-time responses can be determined for 40 keV < E-gamma < 1.4 MeV with a precision better than 10 ps using a Eu-152 gamma-ray source. The new method is described with examples of (n,gamma) and (n,f,gamma) experiments performed at the intense cold-neutron beam facility PF1B of the Institut Laue-Langevin in Grenoble, France, using 16 LaBr3(Ce) detectors within the EXILL&FATIMA campaign in 2013. The results are discussed with respect to possible systematic errors induced by background contributions.

Item Type:Book Section
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© Owned by the authors, published by EDP Sciences, 2015.
ESSN: 2100-014X
Artículo firmado por 31 autores.
This work was supported by NuPNET, by contracts 05P12PKNUF and 05P12RDNUP of the German BMBF, by contract DNC7RP01/4 of the British STFC and by the Spanish MINECO projects FPA2010-17142, CPAN (CSD 2007-00042) and PRI-PIMNUP-2011-1338 (via the ERA-NET NuPNET call for translational joint activities). The EXILL&FATIMA campaign would not have been possible without the support of several services at the ILL and the LPSC. We are grateful to the EXOGAM collaboration for the loan of the detectors, to GANIL for assistance during installation and dismantling and to the FATIMA collaboration for the use of the LaBr3(Ce)-scintillator detectors.
International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS15) (15. 2014. Dresden, Alemania).

Uncontrolled Keywords:Excited-states
Subjects:Sciences > Physics > Nuclear physics
ID Code:32960
Deposited On:31 Aug 2015 08:48
Last Modified:10 Dec 2018 14:57

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