Universität zu Köln

Regis, J-M, Esmaylzadeh, A., Jolie, J., Karayonchev, V, Knafla, Lukas ORCID: 0000-0001-7926-4639, 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

Full text not available from this repository.

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:	Creators Email ORCID ORCID Put Code Regis, J-M UNSPECIFIED UNSPECIFIED UNSPECIFIED Esmaylzadeh, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jolie, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karayonchev, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Knafla, Lukas lknafla@ikp.uni-koeln.de orcid.org/0000-0001-7926-4639 UNSPECIFIED Koester, U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Y. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strub, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Nuclear Physics
Subjects:	Natural sciences and mathematics
Uncontrolled Keywords:	Keywords Language NUCLEAR-DATA SHEETS; EXCITED-STATES; RESONANCE FLUORESCENCE; LIFETIME MEASUREMENTS 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/34367