Universität zu Köln

Regis, J. -M., Saed-Samii, N., Rudigier, M., Ansari, S., Dannhoff, M., Esmaylzadeh, A., Fransen, C., Gerst, R. -B., Jolie, J., Karayonchev, V., Mueller-Gatermann, C. and Stegemann, S. (2016). Reduced gamma-gamma time walk to below 50 ps using the multiplexed-start and multiplexed-stop fast-timing technique with LaBr3(Ce) detectors. Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip., 823. S. 72 - 83. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1872-9576

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Abstract

The electronic gamma-gamma 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 5 ps. This method requires the determination of the energy-dependent time walk of the zero time which is represented by the centroid of a prompt gamma-gamma time distribution. The full-energy peak versus full-energy peak prompt response difference which represents the linearly combined mean gamma-gamma time walk of a fast-timing array consisting of 8 LaBr3(Ce) detectors was measured using a standard Eu-152 gamma-ray source for the energy region of 40-1408 keV. 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 1.5 in. x 1.5 in. 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 gamma lines of Co-60 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 gamma-gamma time walk to below 50 ps is obtained by using a shaping delay time of about 17 ns and an optimum time-walk adjustment needed for detector output pulses with amplitudes smaller than 400 mV. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Regis, J. -M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saed-Samii, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rudigier, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ansari, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dannhoff, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Esmaylzadeh, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fransen, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerst, R. -B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jolie, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karayonchev, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller-Gatermann, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stegemann, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-271855
DOI:	10.1016/j.nima.2016.04.010
Journal or Publication Title:	Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip.
Volume:	823
Page Range:	S. 72 - 83
Date:	2016
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1872-9576
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LIFETIME MEASUREMENTS; EXCITED-STATES Multiple languages Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27185