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

Meisel, Z.; George, Sebastian; Ahn, S.; Browne, J.; Bazin, D.; Brown, B.A.; Carpino, J.F.; Chung, H.; Cyburt, R.H.; Estradé, A.; Famiano, M.; Gade, A.; Langer, C.; Matoš, M.; Mittig, W.; Montes, F.; Morrissey, D.J.; Pereira, J.; Schatz, H.; Schatz, J.; Scott, M.; Shapira, D.; Smith, K.; Stevens, J.; Tan, W.; Tarasov, O.; Towers, S.; Wimmer, K.; Winkelbauer, J. R.; Yurkon, J.; Zegers, R.G.T.

doi:10.1103/PhysRevLett.114.022501

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

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

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http://link.aps.org/doi/10.1103/PhysRevLett.114.022501
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1510.01501v1
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Citation

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: https://hdl.handle.net/11858/00-001M-0000-0029-3063-F

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 shell-model calculations in the sd-pf shell using SDPF-U and SDPF-MU Hamiltonians.