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25 April 2024

» pubmed » pmid10991259

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Direct evidence for the breakdown of the N = 8 shell closure in 12Be
A Navin ; D W Anthony ; T Aumann ; T Baumann ; D Bazin ; Y Blumenfeld ; B A Brown ; T Glasmacher ; P G Hansen ; R W Ibbotson ; P A Lofy ; V Maddalena ; K Miller ; T Nakamura ; B V Pritychenko ; B M Sherrill ; E Spears ; M Steiner ; J A Tostevin ; J Yurkon ; A Wagner ;
Date:	10 Jul 2000
Journal:	Phys Rev Lett, 85 (2), 266-9
Abstract:	Partial cross sections and corresponding momentum distributions have been studied in the one-neutron knockout reaction ( 12Be,11Be+gamma) on a 9Be target at 78 MeV/nucleon. The resulting spectroscopic factors for the only two bound states of 11Be are 0.42+/-0.06 ( 1/2(+)) and 0.37+/-0.06 ( 1/2(-)), where the errors are experimental only. This result shows that N = 8 is not a good closed shell in the neutron-rich 12Be and that the last neutron pair is two-thirds in the ( 1s(2)+0d(2)) intruder configuration.
Source:	PubMed, pmid10991259
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