تقرير
Isomer shift and magnetic moment of the long-lived 1/2$^{+}$ isomer in $^{79}_{30}$Zn$_{49}$: signature of shape coexistence near $^{78}$Ni
| العنوان: | Isomer shift and magnetic moment of the long-lived 1/2$^{+}$ isomer in $^{79}_{30}$Zn$_{49}$: signature of shape coexistence near $^{78}$Ni |
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| المؤلفون: | Yang, X. F., Wraith, C., Xie, L., Babcock, C., Billowes, J., Bissell, M. L., Blaum, K., Cheal, B., Flanagan, K. T., Ruiz, R. F. Garcia, Gins, W., Gorges, C., Grob, L. K., Heylen, H., Kaufmann, S., Kowalska, M., Kraemer, J., Malbrunot-Ettenauer, S., Neugart, R., Neyens, G., Nörtershäuser, W., Papuga, J., Sánchez, R., Yordanov, D. T. |
| سنة النشر: | 2016 |
| المجموعة: | Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Experiment, Nuclear Theory |
| الوصف: | Collinear laser spectroscopy has been performed on the $^{79}_{30}$Zn$_{49}$ isotope at ISOLDE-CERN. The existence of a long-lived isomer with a few hundred milliseconds half-life was confirmed, and the nuclear spins and moments of the ground and isomeric states in $^{79}$Zn as well as the isomer shift were measured. From the observed hyperfine structures, spins $I = 9/2$ and $I = 1/2$ are firmly assigned to the ground and isomeric states. The magnetic moment $\mu$ ($^{79}$Zn) = $-$1.1866(10) $\mu_{\rm{N}}$, confirms the spin-parity $9/2^{+}$ with a $\nu g_{9/2}^{-1}$ shell-model configuration, in excellent agreement with the prediction from large scale shell-model theories. The magnetic moment $\mu$ ($^{79m}$Zn) = $-$1.0180(12) $\mu_{\rm{N}}$ supports a positive parity for the isomer, with a wave function dominated by a 2h-1p neutron excitation across the $N = 50$ shell gap. The large isomer shift reveals an increase of the intruder isomer mean square charge radius with respect to that of the ground state: $\delta \langle r^{2}_{c}\rangle^{79,79m}$ = +0.204(6) fm$^{2}$, providing first evidence of shape coexistence. Comment: 5 pages, 4 figures, 1 table, Accepeted by Phys. Rev. Lett. (2016) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.182502 |
| URL الوصول: | http://arxiv.org/abs/1604.03316 |
| رقم الأكسشن: | edsarx.1604.03316 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.116.182502 |
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