Proton inelastic scattering reveals deformation in He-8



Holl, M, Kanungo, R, Sun, ZH, Hagen, G, Lay, JA, Moro, AM, Navratil, P, Papenbrock, T, Alcorta, M, Connolly, D
et al (show 20 more authors) (2021) Proton inelastic scattering reveals deformation in He-8. PHYSICS LETTERS B, 822. 136710-.

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Abstract

A measurement of proton inelastic scattering of $^8$He at $8.25A$~MeV at TRIUMF shows a resonance at 3.54(6)~MeV with a width of 0.89(11)~MeV. The energy of the state is in good agreement with coupled cluster and no-core shell model with continuum calculations, with the latter successfully describing the measured resonance width as well. Its differential cross section analyzed with phenomenological collective excitation form factor and microscopic coupled reaction channels framework consistently reveals a large deformation parameter $\beta_2$ = 0.40(3), consistent with no-core shell model predictions of a large neutron deformation. This deformed double-closed shell at the neutron drip-line opens a new paradigm.

Item Type: Article
Additional Information: 9 pages, 5 figures. Accepted for publication in Physics Letters B
Uncontrolled Keywords: nucl-ex, nucl-ex, nucl-th
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 11 Oct 2021 09:33
Last Modified: 18 Jan 2023 21:27
DOI: 10.1016/j.physletb.2021.136710
Open Access URL: https://www.sciencedirect.com/science/article/pii/...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3140047