Proton inelastic scattering reveals deformation in $^8$He
M. Holl, R. Kanungo, Z. H. Sun, G. Hagen, J. A. Lay, A. M. Moro, P., Navr\'atil, T. Papenbrock, M. Alcorta, D. Connolly, B. Davids, A. Diaz, Varela, M. Gennari, G. Hackman, J. Henderson, S. Ishimoto, A. I. Kilic, R., Kr\"ucken, A. Lennarz, J. Liang, J. Measures, W. Mittig
TL;DR
This study uses proton inelastic scattering to identify a resonance in $^8$He, revealing significant neutron deformation and supporting models predicting a deformed, double-closed shell at the neutron drip-line.
Contribution
It provides experimental evidence of large neutron deformation in $^8$He and compares results with advanced theoretical models, confirming their predictions.
Findings
Resonance at 3.54 MeV with width 0.89 MeV detected.
Large deformation parameter $eta_2$ = 0.40(3) confirmed.
Agreement between experimental data and theoretical models.
Abstract
A measurement of proton inelastic scattering of He at ~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 = 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.
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