Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Structure and Dynamics of Nuclei II

HK 2.4: Talk

Monday, March 10, 2025, 16:00–16:15, HS 3 Physik

QFS studies with STRASSE at RIBF RIKEN — •Alexandra Stefanescu — Technische Universität Darmstadt, Darmstadt, Germany

STRASSE (Silicon Tracker for RAdioactive nuclei Studies at SAMURAI Experiments) is an advanced tracking system designed for quasi-free scattering (QFS) studies. The setup is optimized for missing-mass spectroscopy in inverse kinematics using a thick liquid-hydrogen (LH2) target, surrounded by double-sided silicon strip detectors (DSSSD) mounted in a compact hexagonal geometry. The tracker array is characterized by fine granularity and high-density electronics readout, high-rate capability and maximized proton tracking efficiency[1].

STRASSE is developed to be used together with the SAMURAI spectrometer at RIBF RIKEN to study the evolution of single-particle states towards the neutron drip-line nuclei, through proton knockout reactions. The accepted experiments with STRASSE are dedicated to (p,2p) and (p,3p) reactions to selectively populate the states of interest in rare isotopes. The physics program with STRASSE will be summarized.

To validate the technical choices made for the STRASSE array, in particular the front-end and back-end readout, the PFAD (Prototype For Advanced Detectors) demonstrator has been developed. Preliminary results of the first experiment with PFAD at SAMURAI, will be presented. * *

[1] H.N. Liu, et al., Eur. Phys. J. A 59, 121 (2023).

Keywords: silicon tracker; neutron rich nuclei; STRASSE