Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Struktur und Dynamik von Kernen

HK 25.6: Vortrag

Dienstag, 18. März 2014, 18:15–18:30, HZ 5

The neutron-rich oxygen isotopes ^25,26O — •Christoph Caesar for the R3B collaboration — TU Darmstadt, Institut für Kernphysik, Germany

The R3B-collaboration has studied the neutron-rich oxygen isotopes ^25,26O by utilizing a kinematically complete measurement at relativistic beam energies with the R3B-LAND-setup[1]. The isotopes of interest have been populated via proton removal from ^26,27F, respectively. The ground-state masses of both isotopes have been extracted: E_r(²⁵O(gs)) = 725₋₂₉⁺⁵⁴ keV; E_r(²⁶O(gs)) 40/120 (68%/95% c.l.) keV. Furthermore, limits on the lifetime of both ground-states have been extracted for the first time: τ(²⁵O(gs)) ≥ 8.2 × 10⁻¹² ns; τ(²⁶O(gs)) 5.7 ns.

The determined ground-state energies have been compared to theoretical shell-model calculations based on chiral effective field theory potentials using chiral NN and 3N forces. In addition residual three-valence-neutron forces, which become more important with increasing neutron number along isotopic chains are included. This work is supported by ‘BMBF project 06 DA 7047 l’, ‘GSI TU Darmstadt Cooperation Contract’, ‘HIC for FAIR’ and ‘NAVI’.

C.Caesar et al. Phys. Rev. C 88 (2013) 034313