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HK: Fachverband Physik der Hadronen und Kerne
HK 70: Structure and Dynamics of Nuclei XII
HK 70.2: Talk
Thursday, March 31, 2022, 16:30–16:45, HK-H6
Lifetime Measurement of the 26O g.s. at SAMURAI — •S. Storck-Dutine1,3, T. Aumann1,2, C. Caesar2,3, J. Kahlbow4,3, V. Panin2,3, and D. Rossi1,2 for the NeuLAND-SAMURAI collaboration — 1Institut für Kernphysik, TU Darmstadt, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 3RIKEN Nishina Center, Tokyo, Japan — 4Massachusetts Institute of Technology, Cambridge MA, USA
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 decay lifetime of the 26O ground state with high sensitivity and precision, a new method has been applied. The experiment was performed in December 2016 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 happening 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. In the report, the experimental setup and method are introduced and the current analysis status is presented.
This work is 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.