Yang, XF, Wraith, C, Xie, L, Babcock, C, Billowes, J, Bissell, ML, Blaum, K, Cheal, B, Flanagan, KT, Ruiz, RF Garcia et al (show 14 more authors)
(2016)
Isomer Shift and Magnetic Moment of the Long-Lived 1/2+ Isomer in 7930Zn49: Signature of Shape Coexistence near 78Ni.
PHYSICAL REVIEW LETTERS, 116 (18).
182502-.
Abstract
Collinear laser spectroscopy is performed on the 79(30)49Zn isotope at ISOLDE-CERN. The existence of a long-lived isomer with a few hundred milliseconds half-life is confirmed, and the nuclear spins and moments of the ground and isomeric states in 79Zn as well as the isomer shift are 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 μ(79Zn)=−1.1866(10)μN, confirms the spin-parity 9/2+ with a νg−1(9/2) shell-model configuration, in excellent agreement with the prediction from large scale shell-model theories. The magnetic moment μ(79mZn)=−1.0180(12)μN 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, δ⟨r2c⟩79,79m=+0.204(6) fm2, providing first evidence of shape coexistence.
| Item Type: | Article |
|---|---|
| Additional Information: | 5 pages, 4 figures, 1 table, Accepeted by Phys. Rev. Lett. (2016) |
| Uncontrolled Keywords: | nucl-ex, nucl-ex, nucl-th |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 07 Jul 2016 09:38 |
| Last Modified: | 19 Jan 2023 07:34 |
| DOI: | 10.1103/PhysRevLett.116.182502 |
| Open Access URL: | http://journals.aps.org/prl/abstract/10.1103/PhysR... |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3002152 |
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