Levels in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Os</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>186</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>as Populated from Decay of 15.8-h<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ir</mml:mi></mml:mrow><mm

Hofstetter, K. J.; Sugihara, T.T.; Brenner, D. S.

doi:10.1103/physrevc.8.2442

Cited by 14 publications

(4 citation statements)

References 21 publications

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“…This result has been interpreted as confirmation of the j~K=5+ 1 configuration proposed by Hofstetter et al [3]. The magnetic moment of an odd-odd nucleus with configuration f K is given by…”

Section: Introductionsupporting

confidence: 70%

“…From fi-decay properties Hofstetter etal. [3] proposed j=K=5+I as the coupling of a proton in a 1/2-[541] Nilsson state and a neutron in a 1/2-[510] state. Emery et al [7] had anticipated theoretically that rotational bands built on these states should be strongly disturbed, and that j=4,5 states would lie energetically lower than the corresponding band heads.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic moment and electric quadrupole moment of the anomalous186Ir ground state

Hagn

Zech

1980

Z Physik A

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The ground state nuclear moments of 186Ir (j~= 5 (+)) have been determined with NMR on oriented 186Ir in Ni as I/x1=3.80 +0"12 -0.02 #N and Q= -3.00 (15)b. The quadrupole moment is consistent with an anamolous j=K=5+0 or 5+1 ground state configuration. The explanation of the magnetic moment in terms of pure 5+0 or 5+1 configurations would require a high collective gR-factor of gR>0.76. On the other hand the magnetic moment can be explained with a "normal" gR and a mixed ground state configuration.

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Section: Introductionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Magnetic moment and electric quadrupole moment of the anomalous186Ir ground state

Hagn

Zech

1980

Z Physik A

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“…Later on, the ground state was mainly associated with I π = 5 + in most of the literature (see e.g. [86]). The assignment of K has been more debatable [87], but it was concluded that the 186 Ir ground state should correspond to a strong mixing of K = 0 and K = 1 [87].…”

Section: The Odd-odd Nuclei A=182184186186 M 188mentioning

confidence: 99%

Deformation change in light iridium nuclei from laser spectroscopy

et al. 2006

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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 7 6s 2 4 F 9/2 → 5d 7 6s6p 6 F 11/2 at 351.5 nm were measured for 182−189 Ir, 186 Ir m and the stable 191,193 Ir. 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 186 Ir m. The spectroscopic quadrupole moments of 182 Ir and 183 Ir were measured also for the first time. A large mean square charge radius change between 187 Ir and 186 Ir g and between 186 Ir m and 186 Ir 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.

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“…The ground state configurations of 184 Ir and 186 Ir have been the subject of many investigations, both theoretically and experimentally [1][2][3][4][5][6][7][8] Os), for which K 0 and 1 is expected. In the framework of the rotational model the K-quantum number can be determined from the spectroscopic quadrupole moment Q which is connected with the intrinsic quadrupole moment Q 0 by…”

Section: Measurements Of Spectroscopic Quadrupole Moments Of Neutron mentioning

confidence: 99%

Measurements of Spectroscopic Quadrupole Moments of Neutron Deficient Ir Isotopes and Shape Coexistence in186Ir

et al. 1996

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The spectroscopic quadrupole moments of the neutron deficient radioactive Ir isotopes Os), for which K 0 and 1 is expected. In the framework of the rotational model the K-quantum number can be determined from the spectroscopic quadrupole moment Q which is connected with the intrinsic quadrupole moment Q 0 byThus, for a low-K state of a nucleus with prolate deformation, a negative quadrupole moment is expected. For 186 Ir, this was confirmed by the measurement of the spectroscopic quadrupole moment with quadrupole-interaction nuclear orientation (QI-NO), which yielded Q 22. 41͑20͒ b [3]. This value indicated a larger nuclear deformation than expected from the extrapolation of heavier Ir isotopes. In this context, it is an interesting question whether the nuclear deformation of the low-K anomalous ground state 186 Ir g is enhanced by the specific properties of the p1͞2 2 ͓541͔ proton intruder state coming down from the ph 9͞2 orbital. This can be tested by a measurement of the quadrupole moment of the low- Os), for which K 4 and 5 is expected. Recently, from spectroscopic investigations, the configuration and even the assignment of I 5 for 184 Ir was doubted [7]. Here, in addition to precision measurements of quadrupole moments, we present a new method for the measurement of ground state spins with resonance precision. It is based on the following features: For the case of a combined magnetic-dipole plus electric-quadrupole hyperfine interaction the resonance spectrum consists of 2I subresonances which are separated equidistantly around the magnetic hyperfine splitting. The frequency offset of the subresonance with the largest amplitude to the magnetic hyperfine splitting depends on I. Thus I can be determined by frequency measurements. This method was applied to 184 Ir, with the unambiguous result I 5. The questions addressed above can be answered by measuring the quadrupole splittings in hcp-Co, from which-without the exact knowledge of the electric field gradient (EFG) of Ir in hcp-Co-highly precise ratios of quadrupole moments are obtained. We also present, however, results of quadrupole-interaction-resolved NMR on oriented nuclei (QI-NMR-ON) measurements on 187 Ir known from muonic x-ray spectroscopy [9], we are able to determine 5016 0031-9007͞96͞77(25)͞5016(4)$10.00

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Levels inOs186as Populated from Decay of 15.8-hIr

Cited by 14 publications

References 21 publications

Magnetic moment and electric quadrupole moment of the anomalous186Ir ground state

Magnetic moment and electric quadrupole moment of the anomalous186Ir ground state

Deformation change in light iridium nuclei from laser spectroscopy

Measurements of Spectroscopic Quadrupole Moments of Neutron Deficient Ir Isotopes and Shape Coexistence in186Ir

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