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American Physical Society, Physical Review Letters, 2(114)

DOI: 10.1103/physrevlett.114.022501

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Mass Measurements Demonstrate a StrongN=28Shell Gap in Argon

Journal article published in 2015 by Z. Meisel, S. George, S. Ahn, J. Browne, D. Bazin ORCID, B. A. Brown, J. F. Carpino, H. Chung, R. H. Cyburt, A. Estradé, M. Famiano, A. Gade, C. Langer, M. Matoš, W. Mittig and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present results from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. We report the first mass measurements of 48Ar and 49Ar and find atomic mass excesses of -22.28(31) MeV and -17.8(1.1) MeV, respectively. These masses provide strong evidence for the closed shell nature of neutron number N=28 in argon, which is therefore the lowest even-Z element exhibiting the N=28 closed shell. The resulting trend in binding-energy differences, which probes the strength of the N=28 shell, compares favorably with shellmodel calculations in the sd-pf shell using SDPF-U and SDPF-MU Hamiltonians. ; Comment: Published in Physical Review Letters