Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Instrumentation XIV

HK 61.4: Vortrag

Donnerstag, 14. März 2024, 16:45–17:00, HBR 14: HS 1

LISA: LIfe-time measurements with Solid Active targets — •Elisa Maria Gandolfo — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

Understanding the nuclear structure and the emergence of collectivity in nuclei is a major open quest in nuclear physics. The collectivity of a nucleus can be evaluated through electromagnetic transition probabilities which can be experimentally accessed through lifetimes of excited states. The latter can be measured in in-beam γ-ray spectroscopy experiments using Doppler-shift techniques. LISA (LIfetime measurement with Solid Active targets) proposes a new approach to measure excited states lifetimes. The main novelty lies in the usage of a multi-layered active target made of single-crystal diamond detectors. Here, each layer serves simultaneously as reaction target and detector. The excellent energy resolution of diamond detectors allows for layer-by-layer Z identification and vertex reconstruction enabling precise Doppler correction despite using thick targets. A first two-layer prototype of LISA has been constructed and its performances has been evaluated with source measurements and in-beam tests at the GSI and HIMAC facilities with beams of ²³⁸U and ¹³²Xe. The goal of these tests was to characterize the energy resolution, the influence of the metalization on the performance, the unique Z identification as well as its capabilities as active target. In this contribution, I will present the current status of the project, first results of the experiments, and an outlook to future developments. This project is funded by the European Research Council under ERC-CoG LISA-101001561).

Keywords: Life-time measurement; gamma spectroscopy; diamond detectors