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.

arXiv commentaccepted for publication in PRL

References in corpus (7)

• The Shell Model as Unified View of Nuclear Structure
• Magic numbers in exotic nuclei and spin-isospin properties of {\it NN} interaction
• Shell Model Study of the Neutron-Rich Nuclei around N=28
• Relativistic Hartree-Bogoliubov description of the deformed N = 28 region
• 29Na: Defining the edge of the Island of Inversion for Z=11
• "Safe" Coulomb Excitation of 30Mg
• The N=28 shell closure; from N=Z to the neutron drip line

Cited by in corpus (19)

• Nuclear magic numbers: new features far from stability
• Collapse of the N=28 shell closure in ${}^{42}$Si
• Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect
• A new effective interaction for $0\hslash \omega$ shell model calculations in the sdpf valence space
• The merging of the islands of inversion at N=20 and N=28
• Well-developed deformation in 42Si
• Energy Density Functional analysis of shape evolution in N=28 isotones
• Evolution of the N=28 shell closure: a test bench for nuclear forces
• Low Energy States of ${}_{31}^{81}G{a}_{50}$ : Elements on the Doubly-Magic Nature of ${}^{78}$Ni
• Mass Measurements Demonstrate a Strong N =28 Shell Gap in Argon
• In-beam gamma-ray spectroscopy of very neutron-rich nuclei: Excited states in 46S and 48Ar
• Neutron spectroscopic factors of Ni isotopes from transfer reactions
• Collectivity evolution in the neutron-rich Pd isotopes towards the N=82 shell closure
• Examining the $N$ = 28 shell closure through high-precision mass measurements of ${}^{46-48}$Ar
• Microscopic study of the Shell Structure evolution in isotopes of light to middle mass range Nuclides
• Triaxial-shape dynamics in the low-lying excited $0^{+}$ state: Role of the collective mass
• Evolution of $N=28$ shell closure in relativistic continuum Hartree-Bogoliubov theory
• Collapse of N$=$28 magicity in exotic ${}^{40}$Mg -- Probe of deformed halo and 2n-radioactivity at Mg neutron drip-line
• Shell closure at $N=34$ and the ${}^{48}$Si nucleus