Isomer shift and magnetic moment of the long-lived 1/2$^{+}$ isomer in $^{79}_{30}$Zn$_{49}$: signature of shape coexistence near $^{78}$Ni
| Autor: | Yang, X.F., Wraith, C., Xie, L., Babcock, C., Billowes, J., Bissell, M.L., Blaum, K., Cheal, B., Flanagan, K.T., Garcia Ruiz, R. F., 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. |
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| Přispěvatelé: | Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
Nuclear Theory (nucl-th)
nucl-th [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] Nuclear Theory Nuclear Physics - Theory ddc:550 FOS: Physical sciences Nuclear Physics - Experiment [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] Präzisionsexperimente - Abteilung Blaum Nuclear Experiment (nucl-ex) nucl-ex Nuclear Experiment |
| Zdroj: | Physical Review Letters Physical review letters 116(18), 182502 (2016). doi:10.1103/PhysRevLett.116.182502 Physical Review Letters, American Physical Society, 2016, 116, pp.182502. ⟨10.1103/PhysRevLett.116.182502⟩ |
| ISSN: | 0031-9007 1079-7114 |
| DOI: | 10.48550/arxiv.1604.03316 |
| Popis: | 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) |
| Databáze: | OpenAIRE |
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