München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Instrumentation XIV

HK 63.4: Vortrag

Freitag, 22. März 2019, 15:00–15:15, HS 12

Performance of a twin position-sensitive Frisch-grid ionization chamber for photofission experiments* — •M. Peck¹, U. Bonnes¹, J. Enders¹, A. Göök², J. Hehner³, A. Oberstedt⁴, and S. Oberstedt² — ¹Institut für Kernphysik, TU Darmstadt, Germany — ²European Commission, Joint Research Centre, Geel, Belgium — ³GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — ⁴ELI-NP, Măgurele, Romania

Twin Frisch-grid ionization chambers (FGIC) [1] for the study of fission-fragment properties have been established as reliable detectors. Fission-fragment mass and energy distributions are determined using the double kinetic energy technique, the polar angle of the collinear fission fragments is determined from the drift time of electrons created by decelerating fission fragments in the counting gas. By exchanging the anode plates in the standard chamber on both sides by an array of grid- and strip-anodes, which are read out by means of resistive charge division [2], a position sensitivity is achieved that allows the azimuthal fragment emission angle to be determined, too [3]. The performance of a twin position-sensitive FGIC for future photofission experiments at ELI-NP has been studied using the well-known ²⁵²Cf(sf) decay. First results will be presented. *Supported by BMBF (05P2018RDEN9) and by the state of Hesse (LOEWE research cluster Nuclear Photonics).

[1] C. Budtz-Jørgensen et al., NIM A 258, 209 (1987).

[2] A. Pullia et al., IEEE Trans. Nucl. Sci. 49, 3269-3277 (2002).

[3] A. Göök et al., NIM A 830, 366-374 (2016).