Spectroscopic quadrupole moment of holmium from pionic X-ray measurement

Ebersold, P.; Aas, B.; Dey, W.; Eichler, Robert; Hartmann, J.‐M.; Leisi, H.J.; Sapp, W.W.

doi:10.1016/0370-2693(74)90340-2

Cited by 22 publications

(2 citation statements)

References 3 publications

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“…The value of \P/h\ = 25.9(3) MHz measured by Bleaney et al (1978), assumed to be positive, leads to a value P3/h = + 24(1) MHz; the relation 3 eQ 4 / ( 2 / -i) r" (37) then gives Vas -+ 7.9(3) x 1021 V m -2 for the lattice e.f.g., on taking Q = + 3.51(4) barns. (Here the error in Q covers the three results of 3.53(4) barns (Cheng et al (1978); 3.49(3) barns (Powers et al (1975(Powers et al ( , 1976; 3.50(11) barns (Ebersold et al 1974). ) This is rather higher than Vzz = +4.59( 9) x 1021 V m-2 obtained from Mossbauer effect measurements on 155Gd in G dV 04 by Cook & Cashion (1979), who also showed th a t Vzz is definitely positive, in agreement with our conclusion for H oV 04.…”

Section: The Nuclear Electric Quadrupole Interactionmentioning

confidence: 60%

Properties of HoVO ₄ below 1 K I. Predictions from nuclear magnetic resonance

Bleaney

1980

Proc. R. Soc. Lond. A

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The size of the internal field in HoVO 4 has been determined by n. m. r. measurements (Bleaney et al . 1978); the interactions between the Ho 3+ ions are mainly dipolar, with a small contribution from antiferromagnetic exchange. It is shown that these measurements can be used directly to calculate the interactions between the enhanced 165 Ho nuclear moments. These interactions are used to predict the nature of the nuclear spin arrangement in the ordered state, and it is shown that a whole range of ‘puckered’ four sub-lattice arrangements all have the same energy. The results are similar to those for a purely dipolar antiferromagnet, with a Néel temperature of 4.8 mK. The sign of the nuclear electric quadrupole interaction is discussed, and the lattice contribution is compared with that deduced by Cook & Cashion (1979) for GdVO 4 .

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Section: The Nuclear Electric Quadrupole Interactionmentioning

confidence: 60%

Properties of HoVO ₄ below 1 K I. Predictions from nuclear magnetic resonance

Bleaney

1980

Proc. R. Soc. Lond. A

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“…There is, however, a large discrepancy to the spectroscopic quadrupole moment obtained from hfs measurements in mesic 16Silo atoms [25][26][27] and from Coulomb excitation [28,29] which yield a mean value of Q=3.51(2)b. As a consequence, the much smaller quadrupole moment as obtained from electronic holmium atoms must be caused by strong quadrupole shielding (Sternheimer effect) probably due to core polarization effects influencing the expectation value _-3\02 (r /4I" If the configuration interaction contributions to the hfs are parametrized as (r /4y are rather small: A4y= -0.041 (1).…”

Section: C) (R -3) Values and The Nuclear Electric Quadrupole Momentmentioning

confidence: 80%

Hyperfine structure measurements in metastable states of165Ho

Burghardt¹,

Büttgenbach²,

Glaeser³

et al. 1982

Z Physik A

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The hyperfine structure constants and the electronic gj factor of the state 4f 11 6s 2 4111/2 belonging to the holmium ground multiplet have been measured using the atomic beam magnetic resonance technique combined with a state-selective laser-induced detection of the resonant atoms. By the same method the gj factor of the level 4f t~ 6s2419/2 was determined, while the hyperfine structures of this metastable state and of two high-lying even parity states have been investigated by high resolution laser spectroscopy. The results for the experimental A and B factors of all four members of the ground multiplet allow a least-squares evaluation of the three magnetic dipole and the three electric quadrupole effective radial parameters for the configuration 4f la 6s 2 of holmium, yielding an accurate value for the spectroscopic nuclear electric quadrupole moment: Qhfs(~6SHo)=2.716(9)b (uncorrected for quadrupole shielding). From a comparison to the quadrupole moments measured in mesic holmium atoms the shielding factor could be estimated. Experimental MethodWhile the holmium energy spectrum comprises several low-lying fine structure states arising from the The atomic beam was evaporated crucible-free from a cylindrical holmium target by electron impact from a 100kV electron gun. This universal evaporation method [-7, 8], originally designed for the highly refractive 4d-and 5d-elements, was used because it allows an enhancement of the population of the metastable states by the decay of electron bombardment excited high-lying fine structure levels.Since the melting point of holmium is only 1,740 K the electron gun was run at a low emission current of 1.5 mA to produce the atomic beam at a vapour pressure of about 0.1 mm Hg. The atoms then pass conventionally equipped flop-in type ABMR magnetic field regions and are focussed on the detector slit if they have undergone an rf transition in the Cfield. The precisely known 39K hfs transitions of a simultaneously running potassium beam which emerges from a resistance heated oven and is registrated by a hot-wire detector are used for a regulation system [9] continuously controlling the magnetic field strength in the C-region of the apparatus. Behind the detector slit the rf-resonant holmium atoms are crossed at right angle by the beam 0340-2193/82/0307/0193/$01.60

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Hadronic Atoms

Wu¹

1977

Atomic Physics 5

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Spectroscopic quadrupole moment of holmium from pionic X-ray measurement

Cited by 22 publications

References 3 publications

Properties of HoVO ₄ below 1 K I. Predictions from nuclear magnetic resonance

Properties of HoVO ₄ below 1 K I. Predictions from nuclear magnetic resonance

Hyperfine structure measurements in metastable states of165Ho

Hadronic Atoms

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Spectroscopic quadrupole moment of holmium from pionic X-ray measurement

Cited by 22 publications

References 3 publications

Properties of HoVO 4 below 1 K I. Predictions from nuclear magnetic resonance

Properties of HoVO 4 below 1 K I. Predictions from nuclear magnetic resonance

Hyperfine structure measurements in metastable states of165Ho

Hadronic Atoms

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Product

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Properties of HoVO ₄ below 1 K I. Predictions from nuclear magnetic resonance

Properties of HoVO ₄ below 1 K I. Predictions from nuclear magnetic resonance