Die magnetischen Momente angeregter Atomkerne

Bodenstedt, E.

doi:10.1002/prop.2180100702

Cited by 15 publications

(4 citation statements)

References 97 publications

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“…However, it is well known that similarly to g s (which is typically attenuated by the quenching factor 0.6 taking into account spin polarization effects [39]) in most deformed nuclei g R is also lowered by 20-30% or more [36]. This effect has been proven both experimentally [40] and theoretically [41][42][43]. We note that the experimental determination of g R is model dependent and in fact usually involves knowledge of MDM.…”

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confidence: 93%

Theoretical Predictions for the Magnetic Dipole Moment of Th229m

Minkov

Pálffy

2019

Phys. Rev. Lett.

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A recent laser spectroscopy experiment [J. Thielking et al., Nature, (London) 556, 321 (2018)] has determined for the first time the magnetic dipole moment of the 7.8 eV isomeric state 229m Th. The measured value differs by a factor of approximately 5 from previous nuclear theory predictions based on the Nilsson model, raising questions about our understanding of the underlying nuclear structure. Here, we present a new theoretical prediction based on a nuclear model with coupled collective quadrupole-octupole and single-particle motions. Our calculations yield an isomer magnetic dipole moment of µ IS = −0.35µN in surprisingly good agreement with the experimentally determined value of −0.37(6)µN , while overestimating the ground state dipole moment by a factor 1.4. The model provides further information on the states' parity mixing, the role and strength of the Coriolis mixing and the most probable value of the gyromagnetic ratio gR and its consequences for the transition probability B(M 1).

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confidence: 93%

Theoretical Predictions for the Magnetic Dipole Moment of Th229m

Minkov

Pálffy

2019

Phys. Rev. Lett.

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“…The collective gyromagnetic factor g R is often associated with the ratio g R = Z/(Z + N ), with Z and N being the proton and neutron numbers, respectively, adopted on the basis of the liquid-drop-model [45]. However, it is known that in most deformed nuclei g R is lowered with respect to this ratio by 20%-30% or more [46,47], with the attenuation being explained by the influence of the pairing interaction on the collective moment of inertia [48][49][50]. Therefore, in Ref.…”

Section: Electric and Magnetic Transition Ratesmentioning

confidence: 99%

$^{229m}$Th isomer from a nuclear model perspective

Minkov,

Pálffy

2021

Preprint

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The physical conditions for the emergence of the extremely low-lying nuclear isomer 229m Th at approximately 8 eV are investigated in the framework of our recently proposed nuclear structure model. Our theoretical approach explains the 229m Th-isomer phenomenon as the result of a very fine interplay between collective quadrupole-octupole and single-particle dynamics in the nucleus. We find that the isomeric state can only appear in a rather limited model space of quadrupole-octupole deformations in the single-particle potential, with the octupole deformation being of a crucial importance for its formation. Within this deformation space the model-described quantities exhibit a rather smooth behaviour close to the line of isomer-ground state quasi-degeneracy determined by the crossing of the corresponding single-particle orbitals. Our comprehensive analysis confirms the previous model predictions for reduced transition probabilities and the isomer magnetic moment, while showing a possibility for limited variation in the ground-state magnetic moment theoretical value. These findings prove the reliability of the model and suggest that the same dynamical mechanism could manifest in other actinide nuclei giving a general prescription for the search and exploration of similar isomer phenomena.

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“…In a case like this, the Curie term b Cu (T) is calculated from a weighted sum over the contributions of different J-levels (see refs. [6,13,14]):…”

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confidence: 99%

“…The positions E J of the fine structure levels serve as free parameters and are estimated by the procedures determining the Van Vleck coefficients. In the Van Vleck terms [2,13,14]:…”

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The Magnetic Response of Europium Implanted in Cerium and in Platinum as Investigated by the PAC-Method

Zeitz¹,

Unterricker

Schneider

et al. 2004

Hyperfine Interact

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The magnetic response of europium in g-cerium and in platinum was studied by applying the perturbed angular correlation spectroscopy. The probe nuclei were 147 Eu(11/2 j ) and 149 Eu(11/2 j ). The response in g-Ce was determined by the electronic S = J = 7/2 ground state of divalent Eu. In Pt, on the other hand, Eu is trivalent (J = 0 ground state). Here the magnetic contributions originate from Van Vleck terms of the whole multiplet system.

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Die magnetischen Momente angeregter Atomkerne

Cited by 15 publications

References 97 publications

Theoretical Predictions for the Magnetic Dipole Moment of Th229m

Theoretical Predictions for the Magnetic Dipole Moment of Th229m

$^{229m}$Th isomer from a nuclear model perspective

The Magnetic Response of Europium Implanted in Cerium and in Platinum as Investigated by the PAC-Method

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