Regis, J-M, Esmaylzadeh, A., Jolie, J., Karayonchev, V, Knafla, L., Koester, U., Kim, Y. H. and Strub, E. (2020). gamma-gamma fast timing at X-ray energies and investigation on various timing deviations. Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip., 955. AMSTERDAM: ELSEVIER. ISSN 1872-9576

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Abstract

We report on systematic gamma-gamma fast-timing measurements by using four cylindrical 1.5 '' x 1.5 '' LaBr3(Ce) scintillator detectors which were installed in compact geometry around the focal plane of the Lohengrin fission-fragment separator at the Institut Laue-Langevin in Grenoble, France. Unconventional gamma-ray sources as Os-185 and W-187 were produced by thermal-neutron activation to provide nearly prompt low-energy gamma and K-X rays with average gamma- and X-ray multiplicity equal to two. Due to practically no contribution of Compton background, highly precise results of time-walk measurements down to 40 keV are presented. Timing deviations related to different phenomena have been investigated, such as the geometry of an extended gamma-ray source and the detector arrangement, long-term timing shifts and the timing contributions of the Compton background and the inter-detector Compton-scattering. The geometrical timing deviations are shown to be minimized using a multi-element detector array with a centrally symmetric arrangement relative to the center of the focal plane. Time-correction formula are proposed as analytical corrections for long-term time shifts, the time contributions of the Compton background and the position-dependent change of the time walk for cases where the calibration source cannot be placed at the center of the focal plane.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Regis, J-MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esmaylzadeh, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jolie, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Karayonchev, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knafla, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koester, U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, Y. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Strub, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-343671
DOI: 10.1016/j.nima.2019.163258
Journal or Publication Title: Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip.
Volume: 955
Date: 2020
Publisher: ELSEVIER
Place of Publication: AMSTERDAM
ISSN: 1872-9576
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
NUCLEAR-DATA SHEETS; EXCITED-STATES; RESONANCE FLUORESCENCE; LIFETIME MEASUREMENTSMultiple languages
Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & FieldsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/34367

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