Exotic Nucleus Helium-9 and its Excited States

Kamal K. Seth, M. Artuso, D. Barlow, S. Iversen, M. Kaletka, H. Nann, B. Parker, R. Soundranayagam

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


The ground state and several excited states of He9, the most neutron-rich nucleus to date, have been identified by means of the reaction Be9-,+)He9. The mass excess of the ground state has been measured and it is found that the nucleus is unbound against single-neutron decay by 1.10.10 MeV only. It is found that the excited-state spectrum of this nucleus, which is very far from the valley of stability, is in good agreement with the predictions of "no-core" shell-model calculations whose parameters were optimized for the stable nuclei in the valley.

Original languageEnglish (US)
Pages (from-to)1930-1933
Number of pages4
JournalPhysical Review Letters
Issue number19
StatePublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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