June 25, 2015 Preprint Open Access

Steppenbeck, D.; et al.

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    "description": "<p>The low-lying structure of the neutron-rich nucleus 50Ar has been investigated at the Radioactive Isotope Beam Factory using in-beam \u03b3-ray spectroscopy with 9Be (54Ca, 50Ar+\u03b3) X,9Be(55Sc,50Ar+\u03b3)X, and 9Be(56Ti, 50Ar + \u03b3)X multinucleon removal reactions at \u223c220 MeV/u. A \u03b3-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\u21922+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.</p>", 
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    "title": "Low-Lying Structure of \u2075\u2070Ar and the N = 32 Subshell Closure"
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