Testing the integration of BaF2detectors into the 8π array: fast-timing measurements at TRIUMF

Autor:	A. C. Morton, G. Hackman, J J Valiente Dobón, Corina Andreoiu, B. Hyland, J. J. Daoud, C. E. Svensson, S. J. Williams, P. E. Garrett, N A Mlwilo, G. F. Grinyer, J J Ressler, M. B. Smith, M. A. Schumaker, R. S. Chakrawarthy, P. H. Regan, C. J. Pearson, G. C. Ball, P M Jenneson
Rok vydání:	2005
Předmět:	Physics Nuclear and High Energy Physics Spectrometer business.industry System of measurement Detector Nuclear physics Full width at half maximum Quality (physics) Optics Picosecond business Test measurement Beam (structure)
Zdroj:	Journal of Physics G: Nuclear and Particle Physics. 31:S1979-S1984
ISSN:	1361-6471 0954-3899
DOI:	10.1088/0954-3899/31/10/114
Popis:	BaF 2 detectors for picosecond gamma-ray decay lifetime measurements have been installed into the 8π gamma-ray spectrometer as a proof-of-principle for a possible installation of a full array of ten detectors. Using four detectors a test measurement of the half-life of the 2 + state in 152 Sm resulted in a value of 1.33(6) ns, compared with a published value of 1.396 ns. Measurements with a 26 Na stopped beam were performed with various master-trigger conditions. Using a master trigger of germanium-SCEPTAR-BaF 2 OR BaF 2 -BaF 2 , the FWHM of the BaF 2 -BaF 2 triggered events was found to be ∼290 ps compared with ∼ 1.9 ns for the germanium-SCEPTAR-BaF 2 triggered events. Simulations using GEANT4 of a suggested BaF 2 lifetime measurement system have been carried out. These illustrate the considerable gain in spectrum quality which can be expected using simple add-back protocols.
Databáze:	OpenAIRE
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