NDLI: Deformation change in light iridium nuclei from laser spectroscopy

Content Provider	Springer Nature Link
Author	Verney, D. Cabaret, L. Crawford, J. E. Duong, H. T. Fricke, B. Genevey, J. Huber, G. Ibrahim, F. Krieg, M. Le Blanc, F. Lee, J. K. P. Le Scornet, G. Lunney, D. Obert, J. Oms, J. Pinard, J. Puteaux, J. C. Rashid, K. Roussière, B. Sauvage, J. Sebastian, V.
Copyright Year	2006
Abstract	Laser spectroscopy measurements have been performed on neutron-deficient and stable Ir isotopes using the COMPLIS experimental setup installed at ISOLDE-CERN. The radioactive Ir atoms were obtained from successive decays of a mass-separated Hg beam deposited onto a carbon substrate after deceleration to 1kV and subsequently laser desorbed. A three-color, two-step resonant scheme was used to selectively ionize the desorbed Ir atoms. The hyperfine structure (HFS) and isotope shift (IS) of the first transition of the ionization path 5d 76s 24 F 9/2 → 5d 76s6p 6 F 11/2 at 351.5nm were measured for 182-189Ir, 186Ir m and the stable 191, 193Ir. The nuclear magnetic moments μI and the spectroscopic quadrupole moments Qs were obtained from the HFS spectra and the change of the mean square charge radii from the IS measurements. The sign of μI was experimentally determined for the first time for the masses 182≤A≤189 and the isomeric state 186Ir m . The spectroscopic quadrupole moments of 182Ir and 183Ir were measured also for the first time. A large mean square charge radius change between 187Ir and 186Ir g and between 186Ir m and 186Ir g was observed corresponding to a sudden increase in deformation: from β2 ≃ + 0.16 for the heavier group A = 193, 191, 189, 187 and 186m to β2≥ + 0.2 for the lighter group A = 186g, 185, 184, 183 and 182. These results were analyzed in the framework of a microscopic treatment of an axial rotor plus one or two quasiparticle(s). This sudden deformation change is associated with a change in the proton state that describes the odd-nuclei ground state or that participates in the coupling with the neutron in the odd-odd nuclei. This state is identified with the π3/2+[402] orbital for the heavier group and with the π1/2-[541] orbital stemming from the 1h 9/2 spherical subshell for the lighter group. That last state seems to affect strongly the observed values of the nuclear moments.
Starting Page	489
Ending Page	518
Page Count	30
File Format	PDF
ISSN	14346001
Journal	The European Physical Journal A - Hadrons and Nuclei
Volume Number	30
Issue Number	3
e-ISSN	1434601X
Language	English
Publisher	Società Italiana di Fisica
Publisher Date	2006-11-29
Publisher Place	Bologna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Elementary Particles and Nuclei Nuclear Physics, Heavy Ions, Hadrons Nuclear Fusion
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics

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