Phys. Rev. Lett. 99, 022503 (2007) [4 pages]Collapse of the N=28 Shell Closure in 42SiReceived 20 December 2006; published 12 July 2007 The energies of the excited states in very neutron-rich 42Si and 41,43P have been measured using in-beam γ-ray spectroscopy from the fragmentation of secondary beams of 42,44S at 39A MeV. The low 2+ energy of 42Si, 770(19) keV, together with the level schemes of 41,43P, 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 42Si is best described as a well-deformed oblate rotor. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.022503
DOI:
10.1103/PhysRevLett.99.022503
PACS:
23.20.Lv, 21.60.Cs, 27.40.+z, 29.30.Kv
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