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Mass Measurements Demonstrate a Strong N =28 Shell Gap in Argon
- Source :
- PRL 114, 022501 (2015)
- Publication Year :
- 2015
-
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.<br />Comment: Published in Physical Review Letters
- Subjects :
- Nuclear Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- PRL 114, 022501 (2015)
- Publication Type :
- Report
- Accession number :
- edsarx.1510.01501
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.114.022501