Mass Measurements Demonstrate a Strong N =28 Shell Gap in Argon
| Autor: | Meisel, Z., George, S., 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. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | PRL 114, 022501 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.114.022501 |
| Popis: | 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 |
| Databáze: | arXiv |
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