Collapse of the N=28 shell closure in $^{42}$Si
Nuclear Experiment
2008-11-26 v1
Abstract
The energies of the excited states in very neutron-rich Si and P have been measured using in-beam -ray spectroscopy from the fragmentation of secondary beams of S at 39 A.MeV. The low 2 energy of Si, 770(19) keV, together with the level schemes of 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 Si is best described as a well deformed oblate rotor.
Keywords
Cite
@article{arxiv.0705.4526,
title = {Collapse of the N=28 shell closure in $^{42}$Si},
author = {B. Bastin and S. Grévy and D. Sohler and O. Sorlin and Zs. Dombrádi and N. L. Achouri and J. C. Angélique and F. Azaiez and D. Baiborodin and R. Borcea and C. Bourgeois and A. Buta and A. Bürger and R. Chapman and J. C. Dalouzy and Z. Dlouhy and A. Drouard and Z. Elekes and S. Franchoo and S. Iacob and B. Laurent and M. Lazar and X. Liang and E. Liénard and J. Mrazek and L. Nalpas and F. Negoita and N. A. Orr and Y. Penionzhkevich and Zs. Podolyák and F. Pougheon and P. Roussel-Chomaz and M. G. Saint-Laurent and M. Stanoiu and I. Stefan and F. Nowacki and A. Poves},
journal= {arXiv preprint arXiv:0705.4526},
year = {2008}
}
Comments
4 pages, 3 figures, accepted for publication in Phys. Rev. lett