Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 6: Structure and Dynamics of Nuclei I
HK 6.3: Talk
Monday, March 30, 2020, 17:15–17:30, J-HS E
Lifetime Measurement of the 26O g.s. at SAMURAI — •Sonja Storck1,3, Thomas Aumann1,2, Christoph Caesar2,3, Julian Kahlbow1,2, and Dominic Rossi1 for the NeuLAND-SAMURAI collaboration — 1Institut für Kernphysik, TU Darmstadt — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3RIKEN Nishina Center, Tokyo
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. According to the lifetime, the decay of 26O happens either in or outside the target. 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 DFG through grant no. SFB 1245, the BMBF under contract number 05P15RDFN1 and the GSI-TU Darmstadt cooperation agreement.