| Autor: |
Kamal K. Seth, M. Kaletka, B. Parker, R. Soundranayagam, S. Iversen, M. Artuso, H. Nann, D. Barlow |
| Rok vydání: |
1987 |
| Předmět: |
|
| Zdroj: |
Physical Review Letters. 58:1930-1933 |
| ISSN: |
0031-9007 |
| DOI: |
10.1103/physrevlett.58.1930 |
| Popis: |
The ground state and several excited states of $^{9}\mathrm{He}$, the most neutron-rich nucleus to date, have been identified by means of the reaction $^{9}\mathrm{Be}({\ensuremath{\pi}}^{\ensuremath{-}}, {\ensuremath{\pi}}^{+})^{9}\mathrm{He}$. The mass excess of the ground state has been measured and it is found that the nucleus is unbound against single-neutron decay by 1.13\ifmmode\pm\else\textpm\fi{}0.10 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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