Mean range bunching of exotic nuclei produced by in-flight fragmentation and fission -- Stopped-beam experiments with increased efficiency

• Published in: arXiv.org
• Main Authors: Dickel, Timo, Hornung, Christine, Amanbayev, Daler, Samuel Ayet San Andres, Beck, Soenke, Bergmann, Julian, Geissel, Hans, Gerl, Juergen, Gorska, Magdalena, Groef, Lizzy, Haettner, Emma, Jan-Paul Hucka, Kostyleva, Daria A, Kripko-Koncz, Gabriella, Mollaebrahimi, Ali, Mukha, Ivan, Pietri, Stephane, Plaß, Wolfgang R, Podolyak, Zsolt, Purushothaman, Sivaji, Moritz Pascal Reiter, Roesch, Heidi, Scheidenberger, Christoph, Tanaka, Yoshiki K, Weick, Helmut, Zhao, Jianwei, Super-FRS Experiment Collaboration
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 30.05.2023
• Subjects: Broadband; Bunching; Focal plane; Nuclides; Physics - Instrumentation and Detectors; Physics - Nuclear Experiment; Projectiles
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2306.09350

The novel technique of mean range bunching has been developed and applied at the projectile fragment separator FRS at GSI in four experiments of the FAIR phase-0 experimental program. Using a variable degrader system at the final focal plane of the FRS, the ranges of the different nuclides can be aligned, allowing to efficiently implant a large number of different nuclides simultaneously in a gas-filled stopping cell or an implantation detector. Stopping and studying a cocktail beam overcomes the present limitations of stopped-beam experiments. The conceptual idea of mean range bunching is described and illustrated using simulations. In a single setting of the FRS, 37 different nuclides were stopped in the cryogenic stopping cell and were measured in a single setting broadband mass measurement with the multiple-reflection time-of-flight mass spectrometer of the FRS Ion Catcher.