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Collapse of the N=28 shell closure in (42)Si.

Authors
  • And 17 more
Type
Published Article
Journal
Physical review letters
Publication Date
Volume
99
Issue
2
Pages
22503–22503
Identifiers
PMID: 17678217
Source
Medline
License
Unknown

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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