Mapping the $N = 40$ Island of Inversion: Precision Mass Measurements of Neutron-rich Fe Isotopes
| Autor: | Porter, W. S., Ashrafkhani, B., Bergmann, J., Brown, C., Brunner, T., Cardona, J. D., Curien, D., Dedes, I., Dickel, T., Dudek, J., Dunling, E., Gwinner, G., Hockenbery, Z., Holt, J. D., Hornung, C., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., Kripkó-Koncz, G., Lykiardopoulou, E. M., Miyagi, T., Mukul, I., Murböck, T., Plaß, W. R., Reiter, M. P., Ringuette, J., Scheidenberger, C., Silwal, R., Walls, C., Wang, H. L., Wang, Y., Yang, J., Dilling, J., Kwiatkowski, A. A. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 105, L041301 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.105.L041301 |
| Popis: | Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than $600\,000$ for the first time, enabled the measurement of $^{63-70}$Fe, including first-time high-precision direct measurements ($\delta m/m \sim 10^{-7}$) of $^{68-70}$Fe, as well as the discovery of a long-lived isomeric state in $^{69}$Fe. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the $^{69}$Fe ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the $N = 40$ island of inversion in Fe, and shed light on trends in level densities indicated in the newly-refined mass surface. Comment: 9 pages, 6 figures |
| Databáze: | arXiv |
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