Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Structure and Dynamics of Nuclei III

HK 22.1: Group Report

Tuesday, March 28, 2017, 14:00–14:30, F 2

Decay Spectroscopy of ¹⁰⁰Sn and Neighboring Nuclei — •D. Lubos, R. Gernhäuser, and T. Faestermann for the EURICA RIBF09 collaboration — Technische Universität München

The region around the heaviest known doubly magic N = Z nucleus ¹⁰⁰Sn is a unique playground to study nuclear structure as well as fundamental interactions and it is important towards the understanding of the rp-process in astrophysics. The Gamow-Teller transition of ¹⁰⁰Sn is predicted to decay dominantly into the lowest 1⁺-state of ¹⁰⁰In such that this decay allows for an accurate determination of its transition strength. At the radioactive isotope beam factory (RIBF) of the RIKEN Nishina Center, an experiment has been performed in order to investigate the properties of nuclei in the region of ¹⁰⁰Sn. The highly segmented Si-detector array WAS3ABi and the high resolution gamma-spectrometer EURICA, employing HPGe- and LaBr-detectors, have been utilized for the decay spectroscopy. A brief overview of the detector setup and the Geant4-simulation will be given within this presentation. The N = Z - 2 nuclei ⁹⁶In, ⁹⁴Cd, ⁹²Ag and ⁹⁰Pd have been newly identified, half-lives were determined with unprecedented precision throughout the region and the experimentally determined B_GT-value of ¹⁰⁰Sn can challenge theoretical models for the first time. Furthermore, the ordering of the lowest energy levels, which is affected by the Wigner-energy, of the neighboring odd-odd N = Z nucleus ⁹⁸In and its decay channels will be discussed in detail. This project is supported by the DFG Cluster of Excellence: Origin and Structure of the Universe and the Hanns-Seidel-Stiftung.