Low-lying intruder 1(-) state in Be-12 and the melting of the N=8 shell closure

Citation
H. Iwasaki et al., Low-lying intruder 1(-) state in Be-12 and the melting of the N=8 shell closure, PHYS LETT B, 491(1-2), 2000, pp. 8-14
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
491
Issue
1-2
Year of publication
2000
Pages
8 - 14
Database
ISI
SICI code
0370-2693(20001012)491:1-2<8:LI1SIB>2.0.ZU;2-#
Abstract
Inelastic scattering of the neutron-rich nucleus Be-12 on lead and carbon t argets has been studied by measuring de-excitation gamma rays in coincidenc e with scattered Be-12. The strong gamma -ray transition from the state at E-x = 2.68(3) MeV following El Coulomb excitation was observed for the lead target, leading to an assignment of J(pi) = 1(-) for the excited state. Th e low excitation energy of this intruder 1(-) state and the deduced large B (El; O-g.s.(+) --> 1(-)) value of 0.051(13)e(2) fm(2) provide a consistent picture of the N = 8 shell melting in Be-12. (C) 2000 Elsevier Science B.V. All rights reserved.