Journal
PHYSICS LETTERS B
Volume 822, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2021.136710
Keywords
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Funding
- National Research Council Canada
- RCNP
- Japanese government [23224008, 14J03935]
- Office of Nuclear Physics, US Department of Energy [DE-FG02-96ER40963, DE-SC0018223]
- Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Field Work Proposal ERKBP72 at Oak Ridge National Laboratory (ORNL)
- Office of Science of the Department of Energy [DE-AC05-00OR22725]
- Spanish Ministerio de Ciencia, Innovacion y Universidades
- FEDER funds [FIS2017-88410-P]
- European Union [. 654002]
- Grants-in-Aid for Scientific Research [14J03935] Funding Source: KAKEN
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In the experiment on proton inelastic scattering of He-8 at 8.25A MeV at TRIUMF, a resonance at 3.54 MeV with a large deformation parameter beta(2) = 0.40(3) was discovered, consistent with predictions of neutron deformation. This reveals a new paradigm of deformed double-closed shell at the neutron drip-line.
A measurement of proton inelastic scattering of He-8 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. (C) 2021 Published by Elsevier B.V.
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