June 25, 2015 Preprint Open Access

Steppenbeck, D.; et al.

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  <identifier identifierType="DOI">10.15161/oar.it/75854</identifier>
  <creators>
    <creator>
      <creatorName>Steppenbeck, D.</creatorName>
      <givenName>D.</givenName>
      <familyName>Steppenbeck</familyName>
    </creator>
    <creator>
      <creatorName>et al.</creatorName>
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  <titles>
    <title>Low-Lying Structure of ⁵⁰Ar and the N = 32 Subshell Closure</title>
  </titles>
  <publisher>INFN Open Access Repository</publisher>
  <publicationYear>2015</publicationYear>
  <subjects>
    <subject>AAM</subject>
    <subject>20152019VQR</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2015-06-25</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Preprint</resourceType>
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    <alternateIdentifier alternateIdentifierType="url">https://www.openaccessrepository.it/record/75854</alternateIdentifier>
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    <relatedIdentifier relatedIdentifierType="DOI" relationType="Compiles">10.1103/PhysRevLett.114.252501</relatedIdentifier>
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  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
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  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;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.&lt;/p&gt;</description>
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