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

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

2007-05-31

arxiv.org/abs/0705.4526v1

Phys.Rev.Lett.99:022503,2007

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, accepted for publication in Phys. Rev. lett

Scientific paper

10.1103/PhysRevLett.99.022503

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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