Observation of T =3 /2 isobaric analog states in 9Be using p +8Li resonance scattering
Abstract
Background: Resonance scattering has been extensively used to study the structure of exotic, neutron-deficient nuclei. Extension of the resonance scattering technique to neutron-rich nuclei was suggested more than 20 years ago. This development is based on the isospin conservation law. In spite of broad field of the application, it has never gained a wide-spread acceptance.
Purpose: To benchmark the experimental approach to study the structure of exotic neutron-rich nuclei through resonance scattering on a proton target. Method: The excitation function for p +8Li resonance scattering is measured using a thick target by recording coincidence between light and heavy recoils, populating T =3 /2 isobaric analog states (IAS) in 9Be. Results: A good fit of the 8Li(p ,p )8Li resonance elastic scattering excitation function was obtained using previously tentatively known 5 /2- T =3 /2 state at 18.65 MeV in 9Be and a new broad T =3 /2 s -wave state—the 5 /2+ at 18.5 MeV. These results fit the expected isomirror properties for the T =3 /2 A =9 isoquartet. Conclusions: Our analysis confirmed isospin as a good quantum number for the investigated highly excited T =3 /2 states and demonstrated that studying the structure of neutron-rich exotic nuclei through IAS is a promising approach.- Publication:
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Physical Review C
- Pub Date:
- July 2020
- DOI:
- 10.1103/PhysRevC.102.014615
- arXiv:
- arXiv:2005.10962
- Bibcode:
- 2020PhRvC.102a4615H
- Keywords:
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- Nuclear Experiment
- E-Print:
- 7 pages, 4 figures, 1 table, submitted to Physical Review C