Measurement of excited states in 40Si and evidence for weakening of the N=28 shell gap

Abstract

Excited states in 40Si have been established by detecting gamma-rays coincident with inelastic scattering and nucleon removal reactions on a liquid hydrogen target. The low excitation energy, 986(5) keV, of the 2+[1] state provides evidence of a weakening in the N=28 shell closure in a neutron-rich nucleus devoid of deformation-driving proton collectivity.

accepted for publication in PRL

References in corpus (1)

• "Safe" Coulomb Excitation of 30Mg

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