Collapse of the N=28 shell closure in (42)Si.
Phys Rev Lett
; 99(2): 022503, 2007 Jul 13.
Article
em En
| MEDLINE
| ID: mdl-17678217
ABSTRACT
The energies of the excited states in very neutron-rich (42)Si and (41,43)P have been measured using in-beam gamma-ray spectroscopy from the fragmentation of secondary beams of (42,44)S at 39A MeV. The low 2(+) energy of (42)Si, 770(19) keV, together with the level schemes of (41,43)P, provides evidence for the disappearance of the Z=14 and N=28 spherical shell closures, which is ascribed mainly to the action of proton-neutron tensor forces. New shell model calculations indicate that (42)Si is best described as a well-deformed oblate rotor.
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MEDLINE
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En
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Phys Rev Lett
Ano de publicação:
2007
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Article
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França