June 25, 2015 Preprint Open Access

Steppenbeck, D.; et al.

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  <dc:creator>Steppenbeck, D.</dc:creator>
  <dc:creator>et al.</dc:creator>
  <dc:date>2015-06-25</dc:date>
  <dc:description>The low-lying structure of the neutron-rich nucleus 50Ar has been investigated at the Radioactive Isotope Beam Factory using in-beam γ-ray spectroscopy with 9Be (54Ca, 50Ar+γ) X,9Be(55Sc,50Ar+γ)X, and 9Be(56Ti, 50Ar + γ)X multinucleon removal reactions at ∼220 MeV/u. A γ-ray peak at 1178(18) keV is reported and assigned as the transition from the first 2+ state to the 0+ ground state. A weaker, tentative line at 1582(38) keV is suggested as the 4+1→2+1 transition. The experimental results are compared to large-scale shell-model calculations performed in the sdpf model space using the SDPF-MU effective interaction with modifications based on recent experimental data for exotic calcium and potassium isotopes. The modified Hamiltonian provides a satisfactory description of the new experimental results for 50Ar and, more generally, reproduces the energy systematics of low-lying states in neutron-rich Ar isotopes rather well. The shell-model calculations indicate that the N=32 subshell gap in 50Ar is similar in magnitude to those in 52Ca and 54Ti and, notably, predict an N=34 subshell closure in 52Ar that is larger than the one recently reported in 54Ca.</dc:description>
  <dc:identifier>https://www.openaccessrepository.it/record/75854</dc:identifier>
  <dc:identifier>10.15161/oar.it/75854</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>doi:10.1103/PhysRevLett.114.252501</dc:relation>
  <dc:relation>doi:10.15161/oar.it/75853</dc:relation>
  <dc:relation>url:https://www.openaccessrepository.it/communities/infn</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/</dc:rights>
  <dc:subject>AAM</dc:subject>
  <dc:subject>20152019VQR</dc:subject>
  <dc:title>Low-Lying Structure of ⁵⁰Ar and the N = 32 Subshell Closure</dc:title>
  <dc:type>info:eu-repo/semantics/preprint</dc:type>
  <dc:type>publication-preprint</dc:type>
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