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Question of low-lying intruder states in Be-8 and neighboring nuclei

AuthorsFayache, M.S.; Moya de Guerra, Elvira ORCID; Sarriguren, Pedro CSIC ORCID; Sharon, Y.Y.; Zamick, L.
KeywordsIntruder states
Light nuclei
Issue DateMay-1998
PublisherAmerican Physical Society
CitationPHYSICAL REVIEW C 57, 2351 (1998)
AbstractThe presence of not yet detected intruder states in Be-8, e.g., a J = 2(+) intruder at 9 MeV excitation would affect the shape of the beta(-/+)-delayed alpha spectra of Li-8 and B-8. In order to test the plausibility of this assumption, shell-model calculations with up to 4 (h) over bar omega excitations in Be-8 (and up to 2 (h) over bar omega excitations in Be-10) were performed. With the above restrictions on the model spaces, the calculations did not yield any low-lying intruder state in Be-8. Another approach-the simple deformed oscillator model with self-consistent frequencies and volume conservation-gives an intruder state in 8Be which is lower in energy than the above shell-model results, but its energy is still considerably higher than 9 MeV.
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