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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Structure and Dynamics of Nuclei VI
HK 26.1: Group Report
Tuesday, March 12, 2024, 17:30–18:00, HBR 14: HS 4
Measurement of the Neutron-Decay Lifetime of the 26O Ground State — •Sonja Storck-Dutine1, Thomas Aumann1,2, Christoph Caesar2,3, Julian Kahlbow1,3, Valerii Panin2,3, and Dominic Rossi1,2 for the SAMURAI20 collaboration — 1Institut für Kernphysik, TU Darmstadt, Germany — 2GSI, Darmstadt, Germany — 3RIKEN Nishina Center, Tokyo, Japan
The ground state of the neutron unbound nucleus 26O is speculated to have a lifetime in the pico-second regime. In order to determine the neutron-decay lifetime of the 26O ground state with high sensitivity and precision, a new method has been applied. The experiment was performed at the Superconducting Analyzer for MUlti-particle from RadioIsotope Beams (SAMURAI) at the Radioactive Isotope Beam Factory (RIBF) at RIKEN. A 27F beam was produced in the fragment separator BigRIPS and impinged on a W/Pt target stack where 26O was produced. The ratio of the number of decays occurring inside and outside of the target will change according to the lifetime. Thus, the velocity difference between the decay neutrons and the fragment 24O delivers a characteristic spectrum from which the lifetime can be extracted. With this method, a new upper limit of the 26O lifetime with reduced uncertainties was measured and will be presented in the report.
Supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245, the BMBF under contract number 05P21RDFN2 and the GSI-TU Darmstadt cooperation agreement.
Keywords: Experimental nuclear structure; Neutron decay; Lifetime measurement; Beyond the neutron drip line; Neutron-rich oxygen