The low temperature electric quadrupole orientation of184Ir and185Ir in rhenium

Allsop, A. L.; Green, V. R.; Stone, N. J.

doi:10.1007/bf01026377

Cited by 16 publications

(4 citation statements)

References 16 publications

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“…Indeed, it was shown that the PTRM calculations [10] successfully described the nuclear spectroscopic data for 187 Au with the assumption that the 9/2 − isomer in 187 Au is the band head of a strongly Coriolis-perturbed rotational band built on the π 1/2 − [541]h 9/2 Nilsson orbital, at a moderate prolate deformation. Similar ground-state bands with anomalous spin sequences were also found, e.g., in 183,185 Au (5/2 − band head) [43,44], 181,183,185 Ir (5/2 − band head) [45][46][47][48], 219 Fr (9/2 − band head) [49], and 221 Fr (5/2 − band head) [50].…”

Section: Discussionsupporting

confidence: 71%

Shape coexistence in Au187 studied by laser spectroscopy

Barzakh¹,

Atanasov²,

Andreyev³

et al. 2020

Phys. Rev. C

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Section: Discussionsupporting

confidence: 71%

Shape coexistence in Au187 studied by laser spectroscopy

Barzakh¹,

Atanasov²,

Andreyev³

et al. 2020

Phys. Rev. C

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“…(The magnetic moment of 186Ir can also be explained only by a large Coriolis mixing, as pointed out by Hagn and Zech [8] and confirmed by Allsop et al [17].) With the electric field gradient eq=-0.151(4) x 1017 V/cm 2 [10] the quadrupole moment is found to be -1.9(5)b, in good agreement with the NO data, -2.3(3)b [5], and -2.5(3)b [7]. The K-mixing could probably be determined by more precise measurements of the quadrupole moments.…”

Section: Resultssupporting

confidence: 81%

“…They argued that their experimental value, 1#[ = 2.6(2) #N, would be in contradiction to a 5/2-1/2[-541] configuration and proposed 5/2 + 5/2 [-402], the latter being the ground-state configuration of the neighbouring odd Re isotopes 179Re, '81Re, ~83Re, 18SRe and 187Re. Hagn et al [5] measured the quadrupole moment of lSSIr to be -2.3(3)b, this result being confirmed by Allsop et al [7], who found Q= -2.5(3)b. The negative quadrupole moment clearly precludes a 5/2 + 5/2 configuration and verifies the 5/2-1/2 configuration, since, within the framework of the rotational model, the K quantum number can be determined via the functional connection between the spectroscopic quadrupole moment and the intrinsic quadrupole moment, the latter being known moderately well from the systematic of B(E2) transition probabilities in this mass region.…”

Section: Introductionmentioning

confidence: 69%

Magnetic moment of the 5/2?1/2[541] ground state of 14h 185Ir

Eder

Hagn

Zech

1986

Z. Physik A - Atomic Nuclei

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The magnetic and electric hyperfine splitting frequencies Ig#NBHF/h] and e2qQ/h of the 5/2-1/21541] ground state of 14h aSSIr in Ni were measured with nuclear magnetic resonance on oriented nuclei to be 360.8(7)MHz and +6.7(2.0)MHz, respectively. The ground state magnetic dipole moment and electric quadrupole moment of 185Ir are deduced to be ]#1=2.601(14)#N and Q=-1.9(5)b, taking values for the hyperfine field and electric field gradient of BnF =-454.9(2.3)kG and eq=-0.151(4)x 1017V/cm2, respectively. The negative quadrupole moment is in agreement with nuclear-orientation data and proves again the I~K= 5/2-1/2 ground state configuration.

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“…Experimental Qs values for 185 Ir available in the literature: from Static nuclear Orientation with γ detection: Hagn et al[43] and Allsop et al[44] and from Nuclear Magnetic Resonance on Oriented Nuclei: Eder et al[80] and Ohya et al[35]. A thick dashed line indicates the weighted average of the experimental values and the hatched zone represents the probable error of the mean.…”

mentioning

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 low temperature electric quadrupole orientation of184Ir and185Ir in rhenium

Cited by 16 publications

References 16 publications

Shape coexistence in Au187 studied by laser spectroscopy

Shape coexistence in Au187 studied by laser spectroscopy

Magnetic moment of the 5/2?1/2[541] ground state of 14h 185Ir

Deformation change in light iridium nuclei from laser spectroscopy

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