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Journal Article

Mass Measurements Demonstrate a Strong N = 28 Shell Gap in Argon


George,  Sebastian
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Meisel, Z., George, S., Ahn, S., Browne, J., Bazin, D., Brown, B., et al. (2015). Mass Measurements Demonstrate a Strong N = 28 Shell Gap in Argon. Physical Review Letters, 114(2): 022501. doi:10.1103/PhysRevLett.114.022501.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-3063-F
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 shell-model calculations in the sd-pf shell using SDPF-U and SDPF-MU Hamiltonians.