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Collapse of the N=28 shell closure in $^{42}$Si
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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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Cited by 1 Pith paper
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Multireference covariant density functional theory for shape coexistence and isomerism in $^{43}$S
MR-CDFT calculations for 43S identify the ground state as dominated by a prolate intruder 1qp configuration, the 7/2-1 as a high-K prolate isomer, and the 3/2-2 as an oblate-prolate admixture.
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