Observation of the First Excited State in 23O
N. Frank, A. Schiller, T. Baumann, D. Bazin, J. Brown, P. A. DeYoung,, J. E. Finck, A. Gade, J. Hinnefeld, R. Howes, J.-L. Lecouey, B. Luther, W. A., Peters, H. Scheit, M. Thoennessen
TL;DR
This paper reports the first observation of an unbound excited state in neutron-rich 23O, identified through a knockout reaction, providing new insights into its nuclear structure.
Contribution
It presents the first experimental detection of the first excited state in 23O and characterizes its energy and nature using a three-nucleon-removal reaction.
Findings
Observed the unbound 5/2+ excited state at 2.8 MeV
Determined the state is unbound by 45 keV
Suggests a direct reaction mechanism
Abstract
The first excited state in neutron-rich 23O was observed in a (2p1n) knock-out reaction from 26Ne on a beryllium target at a beam energy of 86 MeV/A. The state is unbound with respect to neutron emission and was reconstructed from the invariant mass from the 22O fragment and the neutron. It is unbound by 45(2) keV corresponding to an excitation energy of 2.8(1) MeV. The non-observation of further resonances implies a predominantly direct reaction mechanism of the employed three-nucleon-removal reaction which suggests the assignment of the observed resonance to be the 5/2+ hole state.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Atmospheric Ozone and Climate