Collapse of the N=28 shell closure in ⁴²Si

B. Bastin , S. Gr\'evy , D. Sohler , O. Sorlin , Zs. Dombr\'adi , N. L. Achouri , J. C. Ang\'elique , F. Azaiez

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D. Baiborodin R. Borcea C. Bourgeois A. Buta A. B\"urger R. Chapman J. C. Dalouzy Z. Dlouhy A. Drouard Z. Elekes S. Franchoo S. Iacob B. Laurent M. Lazar X. Liang E. Li\'enard J. Mrazek L. Nalpas F. Negoita N. A. Orr Y. Penionzhkevich Zs. Podoly\'ak F. Pougheon P. Roussel-Chomaz M. G. Saint-Laurent M. Stanoiu I. Stefan F. Nowacki A. Poves

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classification ⚛️ nucl-ex

keywords shellactionascribedbeamsbeenbestcalculationsclosure

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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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Collapse of the N=28 shell closure in ⁴²Si

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