Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Structure and Dynamics of Nuclei IV
HK 24.5: Vortrag
Dienstag, 27. Februar 2018, 17:45–18:00, HZO 70
Lifetime Measurement of the 26O g.s. at SAMURAI — •Sonja Storck1, Julian Kahlbow1, Christoph Caesar2, and Thomas Aumann1,2 for the NeuLAND-SAMURAI collaboration — 1Institut für Kernphysik TU Darmstadt, Darmstadt, Deutschland — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Deutschland
A recent experiment and theory calculation suggest that the ground state of the neutron-unbound nucleus 26O could have a lifetime in the pico-second regime. This would constitute the first case of a radioactive decay via neutron emission.
An experiment using a new method to determine the decay lifetime of the 26O ground state with high sensitivity and precision was performed at the Superconducting Analyzer for multi-particle from Radio Isotope Beams (SAMURAI) at the Rare Isotope Beam Factory (RIBF) at RIKEN. Here, 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 new method as well as the experimental setup are introduced and the current analysis status is shown.
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.