Collapse of the N=28 shell closure in $^{42}$Si

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 39 A.MeV. The low $2^+ $ energy of $^{42}$Si, 770(19) keV, together with the level schemes of $^{41,43}$P provide 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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Submitted on : Wednesday, May 9, 2007 - 12:40:22 PM
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B. Bastin, S. Grévy, D. Sohler, O. Sorlin, Zs. Dombradi, et al.. Collapse of the N=28 shell closure in $^{42}$Si. Physical Review Letters, American Physical Society, 2007, 99, pp.022503. ⟨10.1103/PhysRevLett.99.022503⟩. ⟨in2p3-00145207⟩



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